Measurement device, method, and system

Abstract

Embodiments of the present application provide a measurement device, method, and system. The measurement device comprises an optical frequency domain reflectometry (OFDR) module and an optical switch coupled to the OFDR module. The optical switch comprises an input port and N output ports, wherein each of the output ports is connected to a corresponding sensing optical fiber, and N is a positive integer greater than 1. The OFDR module is used for receiving a first control instruction, emitting light on the basis of the first control instruction, and acquiring a first optical power on the basis of the light, wherein the first control instruction is sent to the OFDR module by a computing device on the basis of a first preset time. The OFDR module is further used for indicating the first optical power to the computing device, and if it is determined at a second preset time that a first output port is in an ON state, acquiring a measurement result in a sensing optical fiber connected to the first output port. Therefore, a measurement result having a large measurement range, high distance resolution and high measurement accuracy can be provided without significantly increasing hardware costs.

Description

Measuring device, method and system Technical Field

[0001] The embodiments of the present application relate to the field of optical fiber sensing, and in particular to a measuring device, method, and system. Background Art

[0002] In recent years, with the comprehensive development of fields such as industrial sensing, the application focus of fiber optic sensing has shifted from event perception to precise measurement. For example, in the past two decades, in scenarios such as oil and gas pipelines and perimeter security, the need to determine whether an intrusion has occurred required sensing technology with a range of hundreds of kilometers and a distance resolution of meters. However, today, the demand for measurement technology with a range of hundreds of meters, a distance resolution of decimeters to centimeters, and even millimeters, and higher precision is increasing. For example, in scenarios such as semiconductor temperature measurement, grain storage temperature measurement, and rail weighing, the measurement range is smaller and the required distance resolution and measurement accuracy are higher.

[0003] However, in traditional fiber optic sensing measurement technology, if a wide range is measured, the distance resolution and measurement accuracy are low. If the measurement accuracy and distance resolution are high, the measurement range is limited. To solve this problem, a large number of sensing fibers and more measurement devices are usually deployed to expand the measurement range while ensuring measurement accuracy and distance resolution. However, this leads to excessively high deployment hardware costs. Therefore, how to provide measurement results with a large measurement range, high distance resolution and measurement accuracy without significantly increasing hardware costs has become an urgent problem to be solved.

[0004] Summary of the Invention

[0005] The measurement device, method, and system provided in this application can provide measurement results with a large measurement range, high distance resolution, and high measurement accuracy without significantly increasing hardware costs.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a measurement device, comprising: an Optical Frequency Domain Reflectometry (OFDR) module and an optical switch coupled to the OFDR module, wherein the optical switch includes an input port and N output ports, each of the output ports is connected to a sensing fiber, and N is a positive integer greater than 1; the OFDR module is configured to receive a first control instruction, emit light based on the first control instruction, and obtain a first optical power based on the light, wherein the first control instruction is sent to the OFDR module by a computing device according to a first preset time, and the computing device presets a time for opening each of the output ports, the time including the first preset time, the first preset time corresponding to the first output port, and the N output ports including the first output port; the OFDR module is further configured to indicate the first optical power to the computing device, so that the computing device determines whether to open the first output port at a second preset time based on the first optical power, and the second preset time is determined based on the first preset time; the OFDR module is further configured to obtain a measurement result in the sensing fiber connected to the first output port if the first output port is determined to be in an open state at the second preset time.

[0008] In the present application, the optical switch of the measuring device includes multiple output ports, each of which is connected to a sensing fiber, and each sensing fiber (and the output port of its corresponding optical switch) is sequentially marked, that is, the corresponding output port is controlled to an open state at different preset times, so as to conduct the light path of the output port and the sensing fiber, and obtain the measurement result of the physical quantity in the sensing fiber. In this way, an OFDR module can be deployed, and the connection relationship between the optical switch and the multiple sensing fibers is utilized to realize the measurement in different sensing fibers at different times, that is, it is possible to significantly increase the scope of measurement without significantly increasing the hardware cost. And because the OFDR module is based on the configuration of the optical path of OFDR technology, the operation module can run the OFDR algorithm according to the OFDR technology, and cooperate with the measurement module to obtain the final measurement result, which is based on the OFDR technology, and its accuracy and distance resolution are higher. In addition, due to sequential marking, once a fault occurs, the sensing fiber being measured can be accurately identified in multiple sensing fibers according to the time when the fault occurs, so as to facilitate fault confirmation and maintenance. Since this method can indicate the optical power of the emitted light at a first preset time and determine whether the first output port of the optical switch is open at a second preset time, once a fault occurs, it can be more accurately determined based on the time of the fault whether the fault occurred in the optical device that performed the operation at the first preset time or in the optical switch or sensing optical fiber that performed the operation at the second preset time, thereby enabling more accurate fault confirmation and maintenance.

[0009] In one possible implementation, the measuring device further includes: a plurality of optical sensing fibers, each of which is connected to one of the output ports. The optical sensing fibers can be internal optical components of the measuring device or external components, thereby making the optical component configuration of the measuring device more flexible and adaptable to different measurement scenarios.

[0010] In one possible implementation, the OFDR module includes a swept-frequency laser and a coherent receiving submodule, wherein the swept-frequency laser is configured to emit linear swept-frequency light according to a second optical power indicated by the first control instruction upon receiving the first control instruction, where the second optical power is an optical power preset by the computing device according to the first preset time; and the coherent receiving module is configured to determine the current optical power of the acquired linear swept-frequency light as the first optical power, and indicate the first optical power to the computing device, so that if the computing device determines that the first optical power matches a third optical power, the first output port is opened at the second preset time, wherein the third optical power is an optical power preset by the computing device according to the first preset time, the second optical power, and optical loss.

[0011] The present application can pre-set the second optical power of the linear sweep light sent by the sweep laser at different preset times, and determine the third optical power accordingly based on the conditions of the optical path, taking into account optical loss and other factors. The optical power obtained after the linear sweep light is split and transmitted in the optical path, resulting in a certain amount of loss, is used as the first optical power. Whether the first optical power matches the third optical power is used to determine whether to turn on the optical switch, which can further improve the accuracy of turning on the optical switch. In other words, if the first optical power matches the third optical power, it means that the optical loss is normal, the optical path and the components in the optical path are normal, so the output port of the corresponding optical switch is turned on, and the measurement results of the sensing fiber are obtained with higher accuracy.

[0012] In one possible implementation, the measuring device further includes: a plurality of optical splitters, each of the optical splitters being respectively arranged between each of the output ports and the sensing optical fiber connected to the output port, the optical splitter corresponding to the first output port being used to split the linear swept-frequency light into a first linear swept-frequency light and a second linear swept-frequency light, the first linear swept-frequency light being used to obtain the first optical power, and the second linear swept-frequency light being used to enable the computing device to determine whether the first output port is normal or abnormal.

[0013] By adding an optical splitter between the output port and the sensing fiber, one linear sweep light channel can be used to obtain the first optical power measurement result, while the other linear sweep light channel can be transmitted to the computing device. For example, this linear sweep light channel can be converted into an electrical signal and transmitted to the computing device. If the computing device receives the second linear sweep light channel, it indicates that the optical path of the measurement device and the corresponding output port are normal. If the computing device does not receive the second linear sweep light channel, it may be caused by an optical component in the measurement device causing the optical path abnormality, or the corresponding output port is abnormal. If a measurement abnormality is detected, the addition of an optical splitter can more precisely determine the location of the abnormality, making subsequent troubleshooting more targeted.

[0014] In a second aspect, an embodiment of the present application provides a computing device coupled to a measuring device, wherein an optical switch in the measuring device includes an input port and N output ports, each of the output ports being connected to a sensing optical fiber, where N is a positive integer greater than 1, and the computing device includes: a processing module, configured to preset a time for turning on each output port of the optical switch, wherein the time includes the first preset time, the N output ports include the first output port, and the first preset time corresponds to the first output port; a transceiver module, configured to send a first control instruction to the measuring device according to the first preset time, so that the measuring device emits light based on the first control instruction and obtains a first optical power based on the light; the processing module is further configured to determine whether to turn on the first output port at a second preset time based on the first optical power indicated by the measuring device, so that if the measuring device determines that the first output port is in an open state at the second preset time, it obtains a measurement result in the sensing optical fiber connected to the first output port, and the second preset time is determined based on the first preset time.

[0015] The computing device provided in the present application interacts with the measuring device and can provide measurement results with a large measurement range, high distance resolution and measurement accuracy without significantly increasing hardware costs, while accurately identifying the sensing optical fiber being measured, so as to facilitate maintenance when abnormalities occur in the measurement of multiple sensing optical fibers.

[0016] In one possible implementation, the processing module is further used to preset the second optical power according to the first preset time, and preset the third optical power according to the first preset time, the second optical power and the optical loss; generate the first control instruction, and the first control instruction is used to indicate the second optical power, so that the measuring device emits linear swept light according to the second optical power, determines the first optical power according to the linear swept light and indicates it to the computing device; the transceiver module is further used to receive the indication of the first optical power sent by the measuring device; the processing module is further used to open the first output port at the second preset time if it is determined that the first optical power matches the third optical power.

[0017] In one possible implementation, the processing module is further configured to determine that the first output port is normal if the transceiver module receives a second linear swept-frequency light, and to determine that the first output port is abnormal if the transceiver module does not receive the second linear swept-frequency light, wherein the second linear swept-frequency light is obtained by splitting the linear swept-frequency light by an optical splitter corresponding to the first output port in the measuring device, and the optical splitter corresponding to the first output port is arranged between the first output port and the sensing optical fiber connected to the first output port.

[0018] In a possible implementation, the processing module is further configured to determine that an optical path between the sensing optical fiber connected to the first output port and the measuring device is abnormal if the first output port is not opened within the second preset time.

[0019] In a third aspect, an embodiment of the present application provides a measurement method, which is applied in a measurement device, wherein an optical frequency domain reflectometer (OFDR) module is coupled to an optical switch, and the optical switch includes an input port and N output ports, each of which is connected to a sensing optical fiber, where N is a positive integer greater than 1. The method includes: receiving a first control instruction, emitting light based on the first control instruction, and obtaining a first optical power based on the light, the first control instruction being sent by a computing device to a sensor according to a first preset time, the computing device presetting a time for opening each of the output ports, the time including the first preset time, the first preset time corresponding to the first output port, and the N output ports including the first output port; indicating the first optical power to the computing device so that the computing device determines whether to open the first output port at a second preset time based on the first optical power, the second preset time being determined based on the first preset time; if the first output port is determined to be in an open state at the second preset time, obtaining a measurement result in the sensing optical fiber connected to the first output port.

[0020] In one possible implementation, the method is applied to the measuring device, which further includes a plurality of sensing optical fibers, each of which is connected to one of the output ports.

[0021] In one possible implementation, the receiving of a first control instruction, emitting light based on the first control instruction, obtaining a first optical power based on the light, and indicating the first optical power to the computing device so that the computing device determines whether to open the first output port at a second preset time based on the first optical power includes: if the first control instruction is received, emitting the linear swept light according to the second optical power indicated by the first control instruction, the second optical power being the optical power preset by the computing device according to the first preset time; determining the current optical power of the obtained linear swept light as the first optical power; and indicating the first optical power to the computing device so that if the computing device determines that the first optical power matches a third optical power, the first output port is opened at the second preset time, wherein the third optical power is the optical power preset by the computing device according to the first preset time, the second optical power, and optical loss.

[0022] In one possible implementation, the method is applied in the measuring device, which also includes a plurality of spectrometers, each of which is respectively arranged between each of the output ports and the sensing optical fiber connected to the output port. The method also includes: dividing the linear swept light into a first linear swept light and a second linear swept light, the first linear swept light being used to obtain the first optical power, and the second linear swept light being used to enable the computing device to determine whether the first output port is normal or abnormal.

[0023] In a fourth aspect, an embodiment of the present application provides a measurement method, which is applied in a computing device, wherein the computing device is coupled to a measuring device, and an optical switch in the measuring device includes an input port and N output ports, each of which is connected to a sensing optical fiber, where N is a positive integer greater than 1. The method includes: presetting a time for turning on each output port of the optical switch, wherein the time includes the first preset time, the N output ports include the first output port, and the first preset time corresponds to the first output port; sending a first control instruction to the measuring device according to the first preset time, so that the measuring device emits light based on the first control instruction and obtains a first optical power according to the light; determining whether to turn on the first output port at a second preset time based on the received first optical power, so that if the measuring device determines that the first output port is in an open state at the second preset time, it obtains a measurement result in the sensing optical fiber connected to the first output port, and the second preset time is determined based on the first preset time.

[0024] In one possible implementation, the method further includes: presetting the second optical power according to the first preset time, and presetting the third optical power according to the first preset time, the second optical power, and the optical loss; generating the first control instruction, the first control instruction being used to indicate the second optical power, so that the measuring device emits the linear swept light according to the second optical power, determines the first optical power according to the linear swept light, and indicates it to the computing device; receiving the indication of the first optical power sent by the measuring device; and if it is determined that the first optical power matches the third optical power, opening the first output port at the second preset time.

[0025] In one possible implementation, the method further includes: if a second linear swept-frequency light is received, determining that the first output port is normal; if the second linear swept-frequency light is not received, determining that the first output port is abnormal, wherein the second linear swept-frequency light is obtained by splitting the linear swept-frequency light by a spectrometer of the measuring device, and the spectrometer is arranged between the first output port and the sensing optical fiber connected to the first output port.

[0026] In a possible implementation, the method further includes: if the first output port is not opened within the second preset time, determining that an optical path between the sensing optical fiber connected to the first output port and the measuring device is abnormal.

[0027] In a fifth aspect, the present application provides a measurement system, comprising: a measurement device and a computing device, wherein the measurement device is capable of performing some or all of the operations that the detection device in the first aspect and any possible implementation of the first aspect can perform; and the computing device is capable of performing some or all of the operations that the detection device in the second aspect and any possible implementation of the second aspect can perform.

[0028] In a sixth aspect, the present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements part or all of the operations included in the method described in any of the aforementioned aspects and any possible implementation method of any of the aforementioned aspects.

[0029] In a seventh aspect, the present application provides a computer program product comprising instructions which, when executed on a processor, implement part or all of the operations included in the method described in any of the foregoing aspects and any possible implementation of any of the foregoing aspects.

[0030] In an eighth aspect, the present application provides a chip, comprising: a port circuit and a processor. The port circuit is connected to the processor, and the processor is configured to cause the chip to perform some or all of the operations included in the method described in any of the aforementioned aspects and any possible implementation of any of the aforementioned aspects.

[0031] It should be understood that the second to eighth aspects of the present application are consistent with or correspond to the technical solutions of the first aspect of the present application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation methods are similar, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a schematic structural diagram of a measurement system 1 provided in an embodiment of the present application;

[0034] FIG2 is a schematic structural diagram of a measuring device provided in an embodiment of the present application;

[0035] FIG3 is a schematic structural diagram of another measuring device provided in an embodiment of the present application;

[0036] FIG4 is a schematic structural diagram of an OFDR module provided in an embodiment of the present application;

[0037] FIG5 is another schematic diagram of the structure of the measurement system provided in an embodiment of the present application;

[0038] FIG6 is a structural diagram of a granary deployment measurement system provided in an embodiment of the present application;

[0039] FIG7 is a schematic structural diagram of a rail deployment measurement system provided in an embodiment of the present application;

[0040] FIG8 is a schematic structural diagram of a computing device provided in an embodiment of the present application;

[0041] FIG9 is a schematic flow chart of a measurement method provided in an embodiment of the present application;

[0042] FIG10 is a flow chart of a calculation method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] The terms "first," "second," and similar terms mentioned herein do not denote any order, quantity, or importance, but are merely used to distinguish one component from another. Similarly, terms such as "a" or "an" do not denote a limitation of quantity, but rather denote the presence of at least one.

[0045] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more.

[0046] For ease of understanding, the following first explains the relevant nouns or terms used in the embodiments of this application:

[0047] 1. OFDR technology

[0048] It is a distributed fiber optic sensing technology that can utilize the back reflection of the swept laser in the sensing fiber, coherently receive the reference light and the reflected light, and then demodulate the frequency difference to accurately measure the temperature or stress at a certain position of the sensing fiber.

[0049] Please refer to Figure 1, which is a schematic diagram of a structure of a measurement system 1 provided in an embodiment of the present application. The measurement method provided in an embodiment of the present application, which can also be called a fiber optic sensing measurement method, can be applied in the system shown in Figure 1 or in the device included in the system of Figure 1.

[0050] In FIG1 , the measurement system 1 includes a measurement device 10 and a computing device 20 coupled to the measurement device 10. The measurement device 10 performs temperature or stress measurements based on OFDR technology and can therefore also be referred to as an OFDR hardware device. In one example, the measurement device 10 includes an OFDR module 101 and an optical switch 102. The OFDR module 101 can perform transceiver functions and OFDR measurements, etc. The optical switch 102 is coupled to the OFDR module 101 and includes an input port and N output ports, where N is a positive integer greater than 1, wherein each output port is connected to a sensing fiber. In one example ( FIG1 uses this example as an example), the measurement device 10 can include the OFDR module 101, the optical switch 102, and multiple sensing fibers 103, wherein each output port is connected to a sensing fiber. The computing device 20 can run an OFDR algorithm and can therefore also be referred to as OFDR algorithm software, including a processing module and an OFDR module (not shown in FIG1 ).

[0051] The present embodiment of the present application is described by taking an example of a measuring device 10 including an OFDR module 101 and an optical switch 102 coupled to the OFDR module 101. FIG2 is a schematic structural diagram of a measuring device provided in an embodiment of the present application. The measuring device 10 includes:

[0052] OFDR module 101 and optical switch 102. Optical switch 102 includes an input port and N output ports. Each output port is connected to a sensing fiber, where N is a positive integer greater than 1. The sensing fibers can be provided separately or in other devices. The number of sensing fibers can correspond to the number of output ports of optical switch 102.

[0053] The OFDR module 101 is configured to receive a first control instruction, send light based on the first control instruction, and obtain a first optical power according to the light.

[0054] The first control instruction is sent by the computing device 20 to the OFDR module 101 according to the first preset time. The computing device 20 presets a time for opening each output port, and the time includes the first preset time. The first preset time corresponds to the first output port, and the N output ports include the first output port.

[0055] For example, if there are M optical fiber sensors and the optical switch has N output ports, where M = N, the output ports in the optical switch 102 can be referred to as the first output port, the second output port, through the Nth output port, respectively. The sensing fiber connected to the first output port is referred to as the first sensing fiber, the sensing fiber connected to the second output port is referred to as the second sensing fiber, and so on. The sensing fiber connected to the Nth output port is referred to as the Mth sensing fiber. If 1 ≤ n ≤ M, where n is a positive integer, the nth output port is connected to the nth sensing fiber, and assuming that the nth output port is the first output port in this application, the time corresponding to the opening of the nth output port is the first preset time.

[0056] Exemplarily, in the OFDR module 101, the light emitter is a frequency sweeping laser. After receiving the first control instruction, the frequency sweeping laser sets the linear frequency sweeping optical power and emits light based on the first control instruction. The light emitted according to the linear frequency sweeping optical power is split and transmitted through the optical path in the OFDR module 101 to obtain the first optical power. After the light emitted according to the linear frequency sweeping optical power passes through the optical splitter, the light separated as the reference light enters the coherent receiving module in the OFDR module 101. The coherent receiving module can obtain the first optical power based on the current power of the reference light (i.e., the power after light loss). If the light emitter in the OFDR module 101 is other optical transmitters, the light can also be light of other characteristics. The embodiment of the present application takes the light as linear frequency sweeping light as an example for explanation, but is not limited to this.

[0057] The OFDR module 101 is further configured to indicate the first optical power to the computing device 20 , so that the computing device 20 determines whether to open the first output port at a second preset time according to the first optical power, where the second preset time is determined according to the first preset time.

[0058] The OFDR module 101 is further configured to obtain a measurement result in the sensing optical fiber connected to the first output port if it is determined that the first output port of the optical switch 102 is in the open state at the second preset time.

[0059] For example, referring to FIG1 , if the optical fiber connected to the nth output port (i.e., the first output port) of the optical switch 102 is the sensing fiber 1031 shown in FIG1 , then after the first output port is turned on, the optical path directly between the sensing fiber 1031 and the OFDR module 101 is connected, and the OFDR module 101 can measure physical quantities such as temperature or stress in the sensing fiber 1031 using OFDR technology to obtain measurement results.

[0060] In one possible implementation, suppose a scenario that needs to be measured is: the measurement starts at 16:00:00 in the afternoon, and there are 32 sensor fibers in total in the scenario, and the optical switch 102 includes 1 input port and 32 output ports. Before the measurement system 1 starts the optical fiber sensing measurement, it can pre-set a time (referred to as the preset time) for each sensor fiber 103 for timing marking, which is equivalent to opening the output port connected to each sensor fiber 103 at different preset times to conduct the sensor fiber to obtain the measurement results. For example, the computing device 20 can configure the preset time of 16:00:00 for the sensor fiber corresponding to the first output port (which can be referred to as sensor tag 1). Referring to the above example, the time tag of the first output port can be referred to as 16:00:00, and the time tag of sensor fiber 1 can also be referred to as 16:00:00. Then, at every 10 seconds as the preset time, the other output ports of the optical switch and their corresponding sensor fibers are marked with time tags in turn, such as the sensor fiber corresponding to the second output port (which can be referred to as sensor fiber 1). 2) is preset at 16:00:10, i.e., the time tag is 16:00:10, and the preset time of the sensing fiber (which can be called sensing fiber n) corresponding to the nth output port (assuming n=5) is 16:00:40, i.e., the time tag is 16:00:40, which is equivalent to taking the nth output port as the first output port as an example, the first preset time is 16:00:40, and the timing marking of other output ports and sensing fibers is analogous to this. When n is other values, refer to this example for timing marking, and no further examples will be given. The embodiment of the present application is explained by taking the timing marking implemented by the operation device 20 as an example, but it is not limited to this. The measurement system 1 may also include other devices for timing marking, or the operation device 20 may perform timing marking with reference to this example. The method of timing marking may refer to this example, and no further description will be given. In addition, the embodiment of the present application uses the example of the measurement system 1 performing time-sequential marking on each output port of the optical switch 102 and its corresponding sensor fiber. Since each output port is connected to a sensor fiber, the measurement system 1 can perform time-sequential marking on each optical switch 102 or each sensor fiber 103 separately to achieve opening an output port at different times and conducting its corresponding sensor fiber for measurement, and this example is not limiting.

[0061] Optionally, the computing device 20 may generate control instructions indicating optical power to the measuring device 10 based on different preset times, such as generating a first control instruction corresponding to a first preset time. Furthermore, the optical powers indicated by the control instructions may be the same or different. This embodiment of the present application uses the example of different optical powers corresponding to each preset time. For example, in a scenario including 32 sensing fibers, the computing device 20 may pre-store a table of correspondences between preset times and optical powers. Table 1 is an example of the correspondence between preset times and optical powers indicated by control instructions.

[0062] Table 1

[0063] The computing device 20 compares the current time at which the control instruction is issued with the preset time in Table 1, obtains the optical power corresponding to the preset time, and instructs the OFDR module 101 to transmit light at the optical power corresponding to the current preset time. For example, if the optical power corresponding to the first preset time is currently recorded as the second optical power, the computing device 20 instructs the OFDR module 101 to transmit linear swept light at the second optical power, and obtains the current optical power of the linear swept light after optical loss, i.e., the first optical power. For example, referring to Table 1 and the above example, if the first preset time is 16:00:40, the computing device 20 determines from Table 1 that the optical power corresponding to the first preset time is 12.04 dBm. Therefore, the computing device 20 can send a first control instruction via port 1a, instructing the OFDR module 101 to transmit linear swept light at the second optical power of 12.04 dBm.

[0064] Furthermore, the second optical power indicated by the first control instruction needs to ensure that the linear swept light transmitted in the optical path of the OFDR module 101 has sufficient optical power to measure the physical quantity required for measurement. For example, the second optical power can be set to be greater than the minimum optical power value, such as 10dBm, etc. 10dBm is an example. In actual setting, the minimum optical power value can be determined based on the optical path setting and optical loss conditions.

[0065] In one example, the computing device 20 generates a first control instruction at a first preset time and sends the first control instruction to the OFDR module 101 via port 1a. The first control instruction can be used to instruct the optical power transmitting device (e.g., a swept laser) in the OFDR module 101 to transmit linear swept light at a second optical power (referred to as Pn). Referring to Table 1, if the first preset time is 16:00:40, the second optical power Pn is the optical power corresponding to the first preset time, i.e., 12.04 dBm. The emitted linear swept light may experience some optical loss during transmission along the optical path of the OFDR module 101, such that the first optical power obtained by the OFDR module 101 is less than the second optical power Pn. In other words, the first optical power can be referred to as x*Pn, where x is the total loss (including splitting loss, etc.) of the linear swept light along the optical path of the OFDR module 101, and x < 1. After the OFDR module 101 obtains the first optical power x*Pn, it can send the first optical power to the computing device 20 through port 1b. The computing device 20 performs an optical power matching operation on the first optical power using the OFDR algorithm. If the OFDR algorithm calculation result is a match, the computing device 20 controls the first output port of the optical switch 102 to an open state at a second preset time. For example, in the case of no hardware failure, the OFDR algorithm can be: when x*Pn is compared to a preset third optical power, it is confirmed to be a match, where the third optical power can be pre-stored in a corresponding relationship table related to one or both of the first preset time and the second optical power, and obtained by table lookup. After confirming the match, referring to Figure 1, the computing device 20 can control the optical switch 102 through port 3, open the first output port, and conduct the channel of the sensing fiber (i.e., the nth sensing fiber) connected to the first output port. The OFDR module 101 measures physical quantities such as temperature or stress in the sensing fiber 1031 to obtain the measurement result. The second preset time can be obtained based on the first preset time, for example, tTn=tn+δt, where tn represents the first preset time, Tn represents the second preset time, and δt represents the time period for switching. For example, the measurement system 1 can pre-set a switching period (δt), δt is 10 seconds or 20 seconds, etc. If the computing device 20 fails to switch the first output port of the optical switch to the open state after the second preset time, it is determined that the optical path between the sensing fiber connected to the first output port and the OFDR module 101 is abnormal, and intervention is required to check whether there is a fault in the optical path from the OFDR module 101 to the sensing fiber, or whether there is a component fault in the OFDR module 101, the optical switch 102, or the sensing fiber. If the computing device 20 successfully opens the first output port within the second preset time, after obtaining the measurement result, the OFDR module 101 can also send the measurement result to the computing device 20 through the port 1c, and the computing device 20 can further process the measurement result using the OFDR algorithm.The computing device 20 generates the next control instruction at the next preset time, and repeats the above steps to poll and obtain the measurement results of each sensing optical fiber.

[0066] Optionally, the OFDR algorithm provided in the embodiment of the present application includes Fourier transform, inverse Fourier transform, phase noise compensation algorithm, de-skewing algorithm, autocorrelation algorithm, etc., which are used to implement the above operations of the computing device 20.

[0067] In the embodiment of the present application, the measurement system 1 is performed by sequentially marking each sensor fiber (and the output port of its corresponding optical switch) set in the measurement scene, and the computing device interacts with an OFDR module 101, and the first output port of the corresponding optical switch is opened by the second preset time, and the sensor fiber connected to the first output port is turned on, and the measurement result is obtained in the sensor fiber. The acquisition of the measurement results of multiple sensor fibers is achieved with reference to this method. In the optical fiber sensing measurement system 1, an OFDR module 101 and multiple sensor fibers can be deployed. It is possible to deploy the sensor fibers according to the requirements of the measurement range and distance resolution without significantly increasing the hardware cost, and the measurement results obtained by the OFDR algorithm running in the OFDR module 101 and the computing device are higher in accuracy and distance resolution. In addition, due to the sequential marking, once a fault occurs, the sensor fiber being measured can be accurately identified among the multiple sensor fibers according to the time when the fault occurs, so as to facilitate fault confirmation and maintenance. Furthermore, due to the method provided in the embodiment of the present application, it is possible to indicate the emitted optical power and perform optical power matching at a first preset time, and to open the output port of the optical switch at a second preset time, and then perform subsequent sensing measurements and data processing. Once a fault occurs, it is possible to know more clearly based on the time when the fault occurs whether the optical device performing the operation at the first preset time has a fault, or the optical switch or sensing optical fiber performing the operation at the second preset time has a fault, so that fault confirmation and maintenance can be performed more accurately.

[0068] FIG3 is a schematic diagram of the structure of another measurement device provided in an embodiment of the present application. As shown in FIG3 , measurement device 10 is based on measurement device 10 provided in FIG2 , and further includes sensing fibers 103, each of which is connected to an output port of optical switch 102. Measurement device 10 measures physical quantities based on the measurement method provided by the measurement device provided in FIG2 and variations thereof.

[0069] FIG4 is a schematic diagram of a structure of an OFDR module provided in an embodiment of the present application. FIG4 is only a possible structure of an OFDR module 101. Referring to FIG4, the OFDR module 101 may include a swept laser 1011 and a coherent receiving module 1012. The embodiment of the present application does not limit other devices in the OFDR module 101. In order to perform OFDR measurement of physical quantities (including temperature, stress, etc.), the OFDR module 101 may also be provided with multiple optical splitters 1013, an optical circulator 1014, an auxiliary interferometer arm 1015, and a data acquisition module 1016, etc.

[0070] In a measurement scenario where multiple sensing optical fibers need to be arranged with high precision, high distance resolution, and a large measurement range, the embodiment of the present application is illustrated by taking the example of pre-time marking of each sensing optical fiber 103 and performing temperature measurement at the first preset time. The measurement of other physical quantities such as stress can refer to this example and will not be repeated here.

[0071] For example, assuming that the measurement system 1 has currently completed the temperature measurement of the n-1th sensing fiber 103 and needs to switch to the nth sensing fiber for temperature measurement, if the computing device 20 determines that the current time is the first preset time and the marking time of the nth sensing fiber (i.e., the nth output port of the optical switch) is the first preset time, then, referring to Figures 1 and 4, the computing device 20 sends a first control instruction to the swept laser 1011 through the 1a interface at the first preset time. The first control instruction instructs to emit linear swept light at a second optical power (such as Pn). Referring to Table 2, if n=4, the first preset time is 16:00:30, and the second optical power can be 12.03dBm. After receiving the first control instruction, the swept laser 1011 emits a linear swept light at a second optical power (e.g., Pn = 12.03 dBm). The linear swept light can be recorded as linear swept light 1. The linear swept light 1 is split into two linear swept lights through the first optical splitter 1013, which can be recorded as linear swept light 2 and linear swept light 3. The linear swept light 2 is further split into two linear swept lights through another optical splitter 1013, which can be recorded as linear swept light 4 and linear swept light 5. The linear swept light 3 enters the auxiliary interferometer arm 1015 and finally enters the data acquisition module 1016. The linear swept light 4 passes through the optical circulator 1014 and reaches the optical switch 10 through port 2. 2, in this case, the linear swept-frequency light 6 reaches the connected sensing fiber through the corresponding output port of the optical switch 102 (currently the first output port). In the sensing fiber, the linear swept-frequency light 7 is reflected by sensing the temperature change. After returning to the optical circulator 1014, it reaches the coherent receiving module 1012. The coherent receiving module 1012 uses the line-of-sight linear swept-frequency light 7 as the linear swept-frequency light for temperature measurement, and the line-of-sight linear swept-frequency light 5 as the reference light for temperature measurement. The current power of the linear swept-frequency light 5 is determined as the first optical power. At this time, due to the loss x in the optical path (including splitting loss, etc.), the first optical power can be obtained by multiplying x by the second optical power, that is, the first optical power is x*Pn, where x<1. The coherent receiving module 1012 can indicate the first optical power to the computing device 20 through the 1b port. In one possible implementation, the coherent receiving module 1012 can convert the linear swept light into an electrical signal and send it to the computing device 20, so that the computing device 20 determines the first optical power based on the electrical signal. In this case, the loss x also includes the photoelectric conversion loss.After receiving the first optical power, the computing device 20 calculates whether the first optical power matches the third optical power through the OFDR algorithm, wherein the third optical power can be pre-set by the computing device 20 based on the second optical power corresponding to the first preset time and the possible loss under the optical path configuration of the OFDR module 101. When calculating whether it matches, two cases can be included. If the preset third optical power is a numerical value, it is considered that the first optical power is equal to the third optical power and is considered to be matched. For example, if the first optical power x*Pn=6.00dBm, if the value of the preset third optical power is 6.00dBm, it is considered to be matched. Alternatively, if the preset third optical power is a power range, a match is considered if the first optical power falls within the range of the third optical power (the range can be set based on the actual optical path, as shown in Table 2, and the range can be set to a power value ±0.01dB, etc.). For example, the computing device 20 queries Table 2 and finds that if the first optical power x*Pn=6.00dBm is within the range of the third optical power 6.00dBm±0.01dB corresponding to 16:00:30, then the match is considered. If the computing device 20 determines that the match is true, the computing device 20 can control the optical switch 102 to switch the first output port to an open state through port 3, thereby conducting the sensing fiber connected to the first output port (i.e., the nth sensing fiber). The linear swept light 6 reaching the optical switch 102 can enter the nth sensing fiber through the first output port that is opened. It is back-reflected in the nth sensing fiber to obtain reflected light, namely the linear swept light 7. This reflected light can pass through the optical circulator 1014 to reach the coherent receiving module 1012. The coherent receiving module 1012 performs coherent reception based on the reference light, namely the linear swept light 5, and the reflected light, and then demodulates the frequency difference to accurately measure the temperature of the nth sensing fiber. The measurement result is sent to the computing device 20 through the port 1c. The computing device 20 can calculate the measured temperature based on the measurement result and the OFDR algorithm, such as Fourier transform, inverse Fourier transform, and other algorithms on the measured raw data. The computing device 20 starts the measurement of the next sensing fiber according to this method at the next preset time.

[0072] Table 2

[0073] Table 2 provided in the embodiment of the present application is only an example. In the computing device, the correspondence between the preset time, the sensing optical fiber, the second optical power, and the third optical power can be stored in a table with reference to Table 2, or the preset times can be stored one by one in multiple tables, or one or more of them can be stored in one table, etc., and is not limited to what is shown in Table 2.

[0074] The measurement results obtained through the interaction between the measurement device 10 and the computing device 20 in the embodiment of the present application have high distance resolution and accuracy. The distance resolution Δz is primarily determined by the bandwidth ΔF of the swept laser 1011. For example, a 100nm swept bandwidth corresponds to a distance resolution of approximately 8μm. Through OFDR algorithms such as the sliding window of the inverse Fourier transform, a distance resolution of less than 1cm is ultimately achieved. In addition, because the OFDR algorithm uses changes in the beat frequency fb to determine changes in temperature or stress, generally speaking, high measurement accuracy can be achieved, such as a measurement accuracy of ≤±0.2 degrees Celsius. In conventional technology, an OFDR algorithm is used in conjunction with a frequency-sweeping laser 1011 to obtain measurement results. However, due to the line width of the frequency-sweeping laser 1011, its measurement range L (generally the length of a sensing optical fiber) is generally limited to within a hundred meters. However, in an embodiment of the present application, temperature measurement of M sensing optical fibers with a length of L is achieved by sequentially marking M sensing optical fibers 103 and controlling the switching on state of multiple optical switches 102. Although L is also limited by the line width of the frequency-sweeping laser, temperature measurement is performed through different sensing optical fibers at different times through time polling. For example, within the time M*t, the temperature measurement of M sensing optical fibers can be completed, so that the total measurement length reaches M*L, which is equivalent to increasing the measurement range without significantly increasing the hardware cost.

[0075] The OFDR hardware system provided in the embodiments of the present application, i.e., the measurement device 10, does not limit the type, principle, or number of devices used. For example, the OFDR module 101 may include a swept laser 101 or another laser emitting device. The swept laser 1011 has certain nonlinearities due to frequency sweeping, and the nonlinearity of the swept laser can be compensated to ensure more accurate measurement results. The auxiliary interferometer arm 1015 can be a nonlinear compensation interferometer arm, and its clock scheme can use an external clock scheme or an internal clock scheme. The switching implementation method of the optical switch 102 includes mechanical, sensor, i.e., microelectromechanical systems (MEMS), liquid crystal on silicon (LCOS), or cascades of the above optical switches. The structure of the optical switch is not limited. For example, in the above example, when N = 32, the optical switch can be a 1×32 optical switch, or it can include a 1×2 optical switch and two 2×16 optical switches. The OFDR algorithm software system, that is, the algorithm running in the computing device 20, can be Fourier transform, inverse Fourier transform, phase noise compensation algorithm, de-skew algorithm, autocorrelation algorithm, etc., which can implement the operations in the above examples and obtain measurement results with high accuracy and distance resolution.

[0076] FIG5 is another schematic diagram of the structure of a measurement system provided in an embodiment of the present application. In FIG5 , measurement system 2 includes a measurement device 10 and a computing device 20. Measurement device 10 can be any of the measurement devices shown in FIG2 or FIG3 . FIG5 uses the measurement device shown in FIG3 as an example. Measurement system 2 also includes multiple optical splitters 104. Each optical splitter 104 is disposed between each output port of an optical switch 102 and a sensing fiber 103 connected to the output port.

[0077] The optical splitter corresponding to the first output port is used to split the linear swept-frequency light into a first linear swept-frequency light and a second linear swept-frequency light, the first linear swept-frequency light is used to obtain the first optical power, and the second linear swept-frequency light is used to enable the computing device to determine whether the first output port is normal or abnormal.

[0078] For example, the coupling of the measuring device 10 and the computing device 20 can also refer to the example provided in Figure 5. The method of obtaining the first optical power by the first linear swept-frequency light is obtained with reference to the example of Figure 4. The second linear swept-frequency light enables the computing device to determine whether the first output port is normal or abnormal, including: the measuring device 10 can return the second linear swept-frequency light on the corresponding optical path to the computing device 20 through 4a to 4N. If the computing device 20 determines that the current time is the first preset time and the marking time of the nth sensing optical fiber is the first preset time, referring to the above example, the nth output port (i.e., the first output port) of the optical switch is switched to the open state, and the splitter 104 set between the nth output port and the corresponding nth sensing optical fiber is recorded as the nth splitter. In this case, if the computing device 20 determines that the first optical power matches the third optical power and controls the optical switch 102 to be switched to the first output port at the second preset time, then the second linear swept light passing through the nth optical splitter enters the computing device 20. The computing device 20 can determine that the first output port of the optical switch 102 corresponding to the nth optical splitter is normal by receiving the second linear swept light. If the computing device 20 determines that the first optical power matches the third optical power and controls the optical switch 102 to be switched to the first output port to be open, but the second linear swept light does not enter the computing device 20, the computing device 20 can determine that the first output port of the optical switch 102 corresponding to the nth optical splitter is abnormal based on the failure to receive the second linear swept light. If the computing device 20 determines that the optical power does not match, it is necessary to intervene to check whether there is a fault in the optical path between the OFDR module 101 and the sensing fiber 1031, or whether there is a component fault in the OFDR module 101, the optical switch 102, or the sensing fiber 1031.

[0079] The measurement system 1 or measurement system 2 provided in the embodiments of the present application can be used in different scenarios to measure physical quantities, such as multi-fiber temperature measurement in storage scenarios such as granaries, tobacco, oil and gas, or multi-fiber weight and deviation measurement in track measurement scenarios.

[0080] For example, in a grain storage temperature measurement scenario, FIG6 is a structural diagram of a grain silo deployment measurement system provided by an embodiment of the present application. As shown in FIG6, taking a round silo as an example, the vertical height of the silo can range from 10 meters to 70 meters, and the diameter can range from 15 meters to 30 meters. In order to ensure that the distance resolution and temperature measurement accuracy are high enough, sufficient sensing optical fibers need to be arranged. In the scenario shown in FIG6, the OFDR module 101 and the computing device 20 can be arranged in a convenient position for operation, for example, the OFDR module 101 and the computing device 20 can be set in the round silo. A suitable position such as the equipment layer or above point A (point A of the round silo is the top position in the center of the silo), and multiple sensing optical fibers 103 are deployed downward and along different positions according to needs. A corresponding optical switch 102 is provided between each sensing optical fiber 103 and the OFDR module 101 and the computing device 20 (the optical switch 102, the OFDR module 101 and the computing device 20 are not shown in FIG6 ). The sensing optical fiber 103 can be deployed in the steel cable, which can increase the strength of the sensing optical fiber 103 and prevent the sensing optical fiber 103 from being broken by the grain.

[0081] If it is necessary to measure a granary with a diameter of 30 meters and a height of 45 meters, the temperature measurement accuracy required by the national standard is ±0.2 degrees Celsius. In order to meet the intensive temperature measurement needs, OFDR temperature measurement can be used to achieve a distance resolution of centimeters or even millimeters, and a temperature measurement accuracy of ±0.2 degrees Celsius or even higher for grain storage temperature measurement. However, this temperature measurement requires 32 or even 64 sensor fibers to be arranged horizontally in the granary, that is, the required total fiber length is 1.44 kilometers or even 2.88 kilometers. OFDR temperature measurement is limited by the bandwidth of the sweep laser, and its measurement range is generally limited to a hundred meters. If it is necessary to complete the measurement of this range, it is necessary to match multiple OFDR systems including sweep lasers, and the cost is very high. The measurement system provided in the embodiment of the present application can realize the configuration of fewer OFDR modules by timing marking and controlling the open state of the output port of the optical switch, such as configuring only one OFDR module, completing the temperature measurement of different sensor fibers by different preset times, to achieve the temperature measurement of a sensor fiber with a total fiber length of 1.44 kilometers or even 2.88 kilometers. It is equivalent to measuring the temperature of different sensing optical fibers through time polling, realizing intensive multi-point temperature measurement, which has a high distance resolution and measurement accuracy but a low cost temperature measurement effect.

[0082] Generally, in storage environments such as granaries, temperatures vary significantly at different locations due to factors such as sunlight exposure. If measurement system 1 or measurement system 2 simply adds optical switch output ports corresponding to multiple fiber optic sensors without performing time-series marking, if significant temperature differences occur in the measured data, it will be difficult to determine whether the fault lies with the sensor fiber or the optical switch port using only the optical switch, nor will it be possible to determine whether a problem exists with the OFDR module. The measurement system provided in the present embodiment adjusts the optical power of the output light at different preset times. This allows accurate location of the faulty sensor fiber and the optical switch output port using the currently obtained first optical power and the current time, making it easier to determine the fault location and thus maintain. For example, if the OFDR algorithm of the computing device determines an optical power mismatch at the second preset time and fails to activate the optical switch output port, it can be determined that a problem exists with a component or optical path in the OFDR module, requiring troubleshooting and maintenance. Measurement system 1 further adds an optical splitter after the optical switch, further enabling determination of whether the optical switch is at fault, making maintenance easier. The measurement system provided in the embodiment of the present application has high reliability and high accuracy, is easy to deploy, and can also easily locate a faulty sensor optical fiber through time tags, making it easier to maintain.

[0083] Optionally, in high-temperature storage scenarios such as oil and gas storage, temperature measurement can be performed by referring to the deployment provided in Figure 6. The sensing fiber in the measurement system provided in the embodiment of the present application can use special high-temperature resistant optical fibers such as gold-plated ones, which can achieve temperature measurement at high temperatures (such as 700°C).

[0084] Optionally, in a track measurement scenario, a measurement system can be deployed according to the characteristics of the track. Figure 7 is a structural schematic diagram of a rail deployment measurement system provided in an embodiment of the present application. As shown in Figure 7, the rail is usually a long strip. When the measurement system shown in Figure 1 or Figure 4 is deployed on the rail, if the measurement device includes four sensing fibers, the OFDR module 101 and the computing device 20 can be set in the center of the track, that is, at point B in Figure 7 (the optical switch 102, OFDR module 101 and computing device 20 are not shown in Figure 7). On the left side of point B, a sensing fiber is laid along each of the two rails, respectively denoted as sensing fiber 1031 and sensing fiber 1032. On the right side of point B, a sensing fiber is laid along each of the two rails, respectively denoted as sensing fiber 1033 and sensing fiber 1034, and each sensing fiber is connected to an output port of the optical switch 102. The timing marking and setting of the preset time can refer to the above example. In this way, by deploying sensing optical fibers on the left and right sides of point B respectively, the measurement range can be increased. By deploying sensing optical fibers along both rails at the same time, not only weight measurement can be achieved, but also deviation measurement can be achieved by comparing the stress or weight measured by the two optical fibers on the same side.

[0085] In one possible implementation, where multiple railroad tracks are arranged in parallel, a measurement system can be deployed on each track, as shown in FIG7 . If the railroad tracks are close together, the OFDR module 101 and computing device 20 can be deployed at the center of the parallel tracks, with the measurement system radiating from the center to each railroad track. For example, on a track with eight or twelve parallel rails, for example, sensing fibers can be laid along the left and right sides, as shown in FIG7 , effectively increasing the measurement range of the sensing fiber 103.

[0086] Figure 8 is a structural diagram of a computing device provided in an embodiment of the present application. As shown in Figure 8, the computing device 20 is coupled with the measuring device 10 provided in an embodiment of the present application. The coupling method can refer to Figure 1 or Figure 4 in the above examples and will not be repeated here.

[0087] The processing module 201 is configured to preset a time for turning on each output port of the optical switch 102 , where the time includes a first preset time. The N output ports include the first output port, and the first preset time corresponds to the first output port.

[0088] The transceiver module 202 is configured to send a first control instruction to the measuring device 101 according to a first preset time, so that the measuring device 101 emits light based on the first control instruction and obtains a first optical power according to the light.

[0089] The processing module 201 is also used to determine whether to open the first output port at a second preset time based on the first optical power indicated by the measuring device 10, so that if the measuring device 10 determines that the first output port is in an open state at the second preset time, the measurement result in the sensing optical fiber connected to the first output port is obtained, and the second preset time is determined based on the first preset time.

[0090] Optionally, the processing module 201 is further configured to preset a second optical power corresponding to the first preset time, and preset a third optical power according to the first preset time, the second optical power, and the optical loss; generate a first control instruction, the first control instruction being configured to indicate the second optical power, so that the measuring device 10 emits a linear swept light according to the second optical power, determines the first optical power based on the linear swept light, and indicates the first optical power to the computing device 20;

[0091] The transceiver module is further configured to receive an indication of the first optical power sent by the measuring device.

[0092] The processing module is further configured to enable the first output port at a second preset time if it is determined that the first optical power matches the third optical power.

[0093] Optionally, the processing module 201 is also used to determine that the first output port is normal if the transceiver module 201 receives the second linear swept-frequency light, and to determine that the first output port is abnormal if the transceiver module 201 does not receive the second linear swept-frequency light, wherein the second linear swept-frequency light is obtained by splitting the linear swept-frequency light by the optical splitter corresponding to the first output port in the measuring device 10, and the optical splitter corresponding to the first output port is arranged between the first output port and the sensing optical fiber connected to the first output port.

[0094] Optionally, the processing module 201 is further configured to determine that an optical path between the sensing optical fiber connected to the first output port and the measuring device is abnormal if the first output port is not opened within the second preset time.

[0095] The embodiment of the present application also provides a software for implementing the operations in the operation device 20 in the embodiment of the present application.

[0096] The computing device 20 performs calculations with reference to the measurement method of the computing device 20 in the measurement system provided in Figure 1 or Figure 4 and its variations. The computing device 20 can implement calculations with reference to the above examples and cooperate with the measuring device 10 to complete the measurement, which will not be elaborated.

[0097] FIG9 is a flow chart of a measurement method provided in an embodiment of the present application. The method is applied to a measurement device 10 provided in an embodiment of the present application. The structure of the measurement device 10 is as shown in FIG9 , referring to the above example. The method includes:

[0098] S101: A measuring device receives a first control instruction, emits light based on the first control instruction, and obtains a first optical power according to the light.

[0099] The first control instruction is sent by the computing device according to the first preset time. The computing device presets a time for opening each output port. The time includes the first preset time. The first preset time corresponds to the first output port. The N output ports include the first output port.

[0100] S102: The measuring device indicates a first optical power to the computing device.

[0101] So that the computing device determines whether to open the first output port at a second preset time according to the first optical power, and the second preset time is determined according to the first preset time.

[0102] S103: If the measuring device determines that the first output port is in the open state within the second preset time, the measuring device obtains a measurement result from the sensing optical fiber connected to the first output port.

[0103] Optionally, if it is determined that the first output port is in a closed state, an intervention check is performed on the OFDR device 101 to eliminate the fault.

[0104] In one possible implementation, the method is applied in a measuring device corresponding to FIG. 2 or FIG. 3 to implement measurement.

[0105] In one possible implementation, if the measuring device receives a first control instruction, it emits linear swept light according to the second optical power indicated by the first control instruction, where the second optical power is the optical power preset by the computing device according to the first preset time; the current optical power of the acquired linear swept light is determined as the first optical power; and the first optical power is indicated to the computing device, so that if the computing device determines that the first optical power matches the third optical power, the first output port is opened at the second preset time, wherein the third optical power is the optical power preset by the computing device according to the first preset time, the second optical power, and the optical loss.

[0106] In one possible implementation, the method is applied to a measuring device provided in a system as shown in FIG4 , that is, the measuring device further includes a plurality of optical splitters, each optical splitter being respectively arranged between each output port and a sensing optical fiber connected to the output port. The method further includes: the measuring device splitting the linear swept-frequency light into a first linear swept-frequency light and a second linear swept-frequency light, the first linear swept-frequency light being used to obtain a first optical power, and the second linear swept-frequency light being used to enable a computing device to determine whether the first output port is normal or abnormal.

[0107] The method provided in Figure 9 is applicable to the systems or devices provided in Figures 1 to 7. It should be understood that the measuring device in this method can refer to the above examples when executing the method provided in the embodiments of the present application, and can refer to the examples of the system and device parts of the embodiments of the present application to perform other operations or perform variations of its operations.

[0108] FIG10 is a flow chart of a computing method provided in an embodiment of the present application. The method is applied to the computing device 20 provided in an embodiment of the present application. The structure of the computing device 20 is as shown in FIG10 , referring to the above example. The method includes:

[0109] S201: A measuring device presets a time for turning on each output port of an optical switch, where the time includes a first preset time.

[0110] The N output ports include a first output port, and the first preset time corresponds to the first output port.

[0111] S202: The measuring device sends a first control instruction to the measuring device according to a first preset time.

[0112] So that the measuring device emits light based on the first control instruction and obtains the first optical power according to the light.

[0113] S203: The measuring device determines whether to open the first output port at a second preset time according to the received first optical power.

[0114] If the measuring device determines that the first output port is in the open state at the second preset time, the measuring device obtains the measurement result in the sensing optical fiber connected to the first output port. The second preset time is determined according to the first preset time.

[0115] In one possible implementation, the method further includes: presetting a second optical power corresponding to a first preset time, and presetting a third optical power according to the first preset time, the second optical power, and optical loss; generating a first control instruction, the first control instruction being used to indicate the second optical power, so that the measuring device emits linear swept light according to the second optical power, determines the first optical power according to the linear swept light, and indicates it to the computing device; receiving an indication of the first optical power sent by the measuring device; and if it is determined that the first optical power matches the third optical power, opening the first output port at the second preset time.

[0116] The computing device 20 controls whether to enable the first output port of the optical switch based on whether the first optical power matches the stored third optical power. If so, the computing device may enable the first output port at a second preset time. If not, the computing device maintains the first output port in a closed state.

[0117] In one possible implementation, the method further includes: if a second linear swept-frequency light is received, determining that the first output port is normal; if the second linear swept-frequency light is not received, determining that the first output port is abnormal, wherein the second linear swept-frequency light is obtained by splitting the linear swept-frequency light by a spectrometer of a measuring device, and the spectrometer is arranged between the first output port and a sensing optical fiber connected to the first output port.

[0118] In one possible implementation, the method further includes: if the first output port is not opened within the second preset time, determining that an optical path between the sensing optical fiber connected to the first output port and the measuring device is abnormal.

[0119] The method provided in Figure 10 is applicable to the systems or devices provided in Figures 1 and 4 to 8. It should be understood that the computing device in this method can refer to the above examples when executing the method provided in the embodiments of the present application, and can refer to the examples of the system and device parts of the embodiments of the present application to perform other operations or perform variations of their operations.

[0120] An embodiment of the present application further provides a measurement system, comprising the measurement device 10 and the computing device 20 provided in the above embodiment, for implementing part or all of the operations in any of the methods in any of the above embodiments.

[0121] An embodiment of the present application also provides another measurement system, including at least one memory and at least one processor, wherein the at least one memory stores instructions, and the at least one processor executes the instructions, so that the imaging system implements part or all of the operations of any of the methods in any of the aforementioned embodiments.

[0122] An embodiment of the present application also provides a computer-readable storage medium, which stores instructions. When the computer-readable storage medium is executed on a processor, it implements part or all of the operations in any of the methods in any of the aforementioned embodiments.

[0123] An embodiment of the present application also provides a computer program product, including a computer program, which, when executed on a processor, implements part or all of the operations in any of the methods in any of the aforementioned embodiments.

[0124] The present application also provides a chip including an interface circuit and a processor connected to each other, wherein the processor is configured to cause the chip to execute part or all of the operations in any of the methods in any of the aforementioned embodiments.

[0125] An embodiment of the present application also provides a chip system, including: a processor, the processor is coupled to a memory, the memory is used to store programs or instructions, when the program or instructions are executed by the processor, the chip system implements part or all of the operations of any one of the methods of any one of the embodiments described above.

[0126] Optionally, there may be one or more processors in the chip system. The processor may be implemented in hardware or software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, etc. When implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory.

[0127] Optionally, the memory in the chip system may be one or more. The memory may be integrated with the processor or may be provided separately from the processor, which is not limited in the embodiments of the present application. For example, the memory may be a non-transient processor, such as a read-only memory (ROM), which may be integrated with the processor on the same chip or provided on different chips. The embodiments of the present application do not specifically limit the type of memory or the configuration of the memory and the processor.

[0128] Exemplarily, the chip system can be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processing unit (CPU), a digital signal processing circuit (DSP), a micro controller unit (MCU), a programmable logic device (PLD) or other integrated chips.

[0129] The terms "first," "second," "third," "fourth," and the like (if any) in the specification and claims of this application and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0130] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0131] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical business division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0132] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0133] In addition, each business unit in each embodiment of the present application can be integrated into a processing unit, each unit can exist physically separately, or two or more units can be integrated into a single unit. The above-mentioned integrated units can be implemented in the form of hardware or software business units.

[0134] If the integrated unit is implemented in the form of a software business unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the technical solution of the present application can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0135] Those skilled in the art will appreciate that, in one or more of the examples above, the services described herein may be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these services may be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transmission of computer programs from one location to another. Storage media may be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0136] The above specific implementation methods further describe in detail the purpose, technical solutions and beneficial effects of this application. It should be understood that the above are only specific implementation methods of this application.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A measuring device, characterized in that: include: An optical frequency domain reflectometry (OFDR) module and an optical switch coupled to the OFDR module, wherein the optical switch comprises an input port and N output ports, each of the output ports is connected to a sensing optical fiber, and N is a positive integer greater than 1; The OFDR module is configured to receive a first control instruction, emit light based on the first control instruction, and obtain a first optical power according to the light, wherein the first control instruction is sent to the OFDR module by a computing device according to a first preset time, and the computing device presets a time for opening each of the output ports, the time includes the first preset time, the first preset time corresponds to a first output port, and the N output ports include the first output port; The OFDR module is further used to indicate the first optical power to the computing device, so that the computing device determines whether to open the first output port at a second preset time according to the first optical power, and the second preset time is determined according to the first preset time; The OFDR module is further configured to obtain a measurement result in the sensing optical fiber connected to the first output port if the first output port is determined to be in an open state at a second preset time.

2. The device according to claim 1, characterized in that Also includes: A plurality of sensing optical fibers, each of which is connected to one of the output ports.

3. The device according to claim 1 or 2, characterized in that: The OFDR module includes a frequency-sweeping laser and a coherent receiving submodule. The frequency sweeping laser is used to emit linear frequency sweeping light according to a second optical power indicated by the first control instruction if the first control instruction is received, where the second optical power is an optical power preset by the computing device according to the first preset time; The coherent receiving module is used to determine the current optical power of the acquired linear swept light as the first optical power, and indicate the first optical power to the computing device, so that if the computing device determines that the first optical power matches the third optical power, the first output port is opened at the second preset time, wherein the third optical power is the optical power preset by the computing device based on the first preset time, the second optical power and the optical loss.

4. The device according to claim 3, characterized in that Also includes: A plurality of optical splitters, each of which is disposed between each of the output ports and the sensing optical fiber connected to the output port. The optical splitter corresponding to the first output port is used to split the linear swept-frequency light into a first linear swept-frequency light and a second linear swept-frequency light, the first linear swept-frequency light is used to obtain the first optical power, and the second linear swept-frequency light is used to enable the computing device to determine whether the first output port is normal or abnormal.

5. A computing device, characterized in that: The optical switch in the measuring device comprises an input port and N output ports, each of the output ports is connected to a sensing optical fiber, N is a positive integer greater than 1, and the computing device comprises: A processing module, configured to preset a time for opening each output port of the optical switch, wherein the time includes the first preset time, the N output ports include the first output port, and the first preset time corresponds to the first output port; a transceiver module, configured to send a first control instruction to the measuring device according to a first preset time, so that the measuring device emits light based on the first control instruction and obtains a first optical power according to the light; The processing module is further used to determine whether to open the first output port at a second preset time based on the first optical power indicated by the measuring device, so that if the measuring device determines that the first output port is in an open state at the second preset time, the measurement result in the sensing optical fiber connected to the first output port is obtained, and the second preset time is determined based on the first preset time.

6. The device according to claim 5, characterized in that The processing module is further used to preset the second optical power according to the first preset time, and preset the third optical power according to the first preset time, the second optical power and the optical loss; generate the first control instruction, the first control instruction is used to indicate the second optical power, so that the measuring device emits the linear swept light according to the second optical power, determines the first optical power according to the linear swept light, and indicates it to the computing device; The transceiver module is further used to receive an indication of the first optical power sent by the measuring device; The processing module is further configured to enable the first output port at the second preset time if it is determined that the first optical power matches the third optical power.

7. The device according to claim 6, characterized in that The processing module is further configured to determine that the first output port is normal if the transceiver module receives the second linear frequency sweep light. If the transceiver module does not receive the second linear swept-frequency light, it is determined that the first output port is abnormal, wherein the second linear swept-frequency light is obtained by splitting the linear swept-frequency light by an optical splitter corresponding to the first output port in the measuring device, and the optical splitter corresponding to the first output port is arranged between the first output port and the sensing optical fiber connected to the first output port.

8. The device according to any one of claims 5 to 7, characterized in that The processing module is further configured to determine that an optical path between the sensing optical fiber connected to the first output port and the measuring device is abnormal if the first output port is not opened within the second preset time.

9. A measurement method, characterized in that: The method is applied in a measuring device, wherein an optical frequency domain reflectometer (OFDR) module is coupled with an optical switch, wherein the optical switch comprises an input port and N output ports, each of the output ports is connected to a sensing optical fiber, and N is a positive integer greater than 1. The method comprises: receiving a first control instruction, emitting light based on the first control instruction, and obtaining a first optical power according to the light, wherein the first control instruction is sent to the controller by a computing device according to a first preset time, the computing device presets a time for opening each of the output ports, the time includes the first preset time, the first preset time corresponds to a first output port, and the N output ports include the first output port; indicating the first optical power to the computing device, so that the computing device determines whether to open the first output port at a second preset time according to the first optical power, where the second preset time is determined according to the first preset time; If it is determined at the second preset time that the first output port is in the open state, a measurement result in the sensing optical fiber connected to the first output port is obtained.

10. The method according to claim 9, characterized in that The method is applied in the measuring device, which further comprises a plurality of sensing optical fibers, each of which is connected to one of the output ports.

11. The method according to claim 9 or 10, characterized in that: The receiving a first control instruction, emitting light based on the first control instruction, obtaining a first optical power according to the light, and indicating the first optical power to the computing device so that the computing device determines whether to open the first output port at a second preset time according to the first optical power, comprises: If the first control instruction is received, a linear frequency-sweep light is emitted according to a second optical power indicated by the first control instruction, where the second optical power is an optical power preset by the computing device according to the first preset time; Determining the acquired current optical power of the linear frequency sweep light as the first optical power; Indicate the first optical power to the computing device so that if the computing device determines that the first optical power matches the third optical power, the first output port is opened at the second preset time, wherein the third optical power is an optical power preset by the computing device based on the first preset time, the second optical power and optical loss.

12. The method according to claim 11, characterized in that The method is applied in the measuring device, which further comprises a plurality of optical splitters, each of which is respectively arranged between each of the output ports and the sensing optical fiber connected to the output port. The method further comprises: The linear frequency sweep light is divided into a first linear frequency sweep light and a second linear frequency sweep light, the first linear frequency sweep light is used to obtain the first optical power, and the second linear frequency sweep light is used to enable the computing device to determine whether the first output port is normal or abnormal.

13. A measurement method, characterized in that: The method is applied in a computing device, the computing device is coupled to a measuring device, an optical switch in the measuring device comprises an input port and N output ports, each of the output ports is connected to a sensing optical fiber, N is a positive integer greater than 1, and the method comprises: Preset a time for opening each output port of the optical switch, the time includes the first preset time, the N output ports include the first output port, and the first preset time corresponds to the first output port; Sending a first control instruction to the measuring device according to a first preset time, so that the measuring device emits light based on the first control instruction and obtains a first optical power according to the light; Determine whether to open the first output port at a second preset time based on the first received optical power, so that if the measuring device determines that the first output port is in an open state at the second preset time, the measurement result in the sensing optical fiber connected to the first output port is obtained, and the second preset time is determined based on the first preset time.

14. The method according to claim 13, characterized in that Also includes: Preset a second optical power according to the first preset time, and preset a third optical power according to the first preset time, the second optical power and optical loss; generating the first control instruction, wherein the first control instruction is used to indicate the second optical power, so that the measuring device emits linear frequency-sweep light according to the second optical power, determines the first optical power according to the linear frequency-sweep light, and indicates it to the computing device; receiving an indication of the first optical power sent by the measuring device; If it is determined that the first optical power matches the third optical power, the first output port is opened at the second preset time.

15. The method according to claim 14, characterized in that Also includes: If the second linear swept-frequency light is received, it is determined that the first output port is normal; if the second linear swept-frequency light is not received, it is determined that the first output port is abnormal, wherein the second linear swept-frequency light is obtained by splitting the linear swept-frequency light by the spectrometer of the measuring device, and the spectrometer is arranged between the first output port and the sensing optical fiber connected to the first output port.

16. The method according to any one of claims 13 to 15, characterized in that Also includes: If the first output port is not opened within the second preset time, it is determined that the optical path between the sensing optical fiber connected to the first output port and the measuring device is abnormal.

17. A measurement system, characterized in that: include: The measuring device according to any one of claims 1 to 4; A computing device as claimed in any one of claims 5 to 8.

18. A computer-readable storage medium, characterized in that: The computer-readable storage medium comprises instructions, which, when executed by a processor, enable the method according to any one of claims 9 to 12 to be implemented, or enable the method according to any one of claims 13 to 16 to be implemented.

19. A computer program product, characterized in that The computer program product comprises instructions, which, when executed by a processor, cause the method according to any one of claims 9 to 12 to be implemented, or cause the method according to any one of claims 13 to 16 to be implemented.

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