Optical fiber temperature measuring method and optical fiber temperature measuring device

Abstract

The invention discloses an optical fiber temperature measurement method and an optical fiber temperature measurement device. The optical fiber temperature measurement method comprises the steps that a laser delay signal is generated in response to a temperature measurement instruction, the laser delay signal comprises a plurality of delay parameters, and the delay parameters are time delay parameters or phase delay parameters; according to the multiple delay parameters, delay collection is conducted on the laser scattering signals, multiple signal sequences are obtained, each signal sequence comprises the laser scattering signals collected under the corresponding delay parameters, and the laser scattering signals are scattered light signals generated by the temperature measuring optical fiber after pulse laser is injected into the temperature measuring optical fiber; sorting the laser scattering signals in the plurality of signal sequences according to the sampling time point of each laser scattering signal in the plurality of signal sequences to obtain a target signal sequence; and analyzing the target signal sequence, and determining the optical fiber temperature of the temperature measurement optical fiber. According to the scheme provided by the embodiment of the invention, the spatial resolution of the optical fiber temperature measurement system can be improved, and the cost of the optical fiber temperature measurement system is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of optical fiber temperature measurement, and particularly relates to an optical fiber temperature measurement method and an optical fiber temperature measurement device. Background Art

[0002] The distributed optical fiber temperature measurement system uses an optical fiber sensor to achieve real-time and continuous temperature measurement, and has advantages such as a wide measurement range, high precision, and strong anti-interference ability. Among them, the spatial resolution is one of the important parameters of the distributed optical fiber temperature measurement system.

[0003] In the related art, usually, the spatial resolution of the distributed optical fiber temperature measurement system is improved by compressing the pulse of the pulsed laser and increasing the sampling rate of the backscattered light. This method requires the system to support a data acquisition unit for backscattered light signals with a higher sampling rate, increasing the hardware cost of the system. Summary of the Invention

[0004] The embodiments of this application provide an optical fiber temperature measurement method and an optical fiber temperature measurement device, which can improve the spatial resolution of the optical fiber temperature measurement system and reduce the cost of the optical fiber temperature measurement system.

[0005] In a first aspect, the embodiments of this application provide an optical fiber temperature measurement method, which includes: in response to a temperature measurement instruction, generating a laser delay signal, where the laser delay signal includes a plurality of delay parameters, and all the plurality of delay parameters are time delay parameters or phase delay parameters; performing delayed acquisition on the laser scattering signal according to the plurality of delay parameters to obtain a plurality of signal sequences, where each signal sequence contains the laser scattering signal collected under the corresponding delay parameter, and the laser scattering signal is the scattered light signal generated by the temperature measurement optical fiber after the pulsed laser is injected into the temperature measurement optical fiber; sorting the laser scattering signals in the plurality of signal sequences according to the sampling time points corresponding to each laser scattering signal in the plurality of signal sequences to obtain a target signal sequence; performing signal analysis on the target signal sequence to determine the optical fiber temperature of the temperature measurement optical fiber.

[0006] In a second aspect, an embodiment of the present application provides an optical fiber temperature measurement device, which includes: a delay module for generating a laser delay signal in response to a temperature measurement instruction, where the laser delay signal includes a plurality of delay parameters, and all the plurality of delay parameters are time delay parameters or phase delay parameters; an acquisition module for performing delayed acquisition on the laser scattering signal according to the plurality of delay parameters to obtain a plurality of signal sequences, where each signal sequence contains the laser scattering signal acquired under the corresponding delay parameter, and the laser scattering signal is the scattered light signal generated by the temperature measurement optical fiber after pulsed laser is injected into the temperature measurement optical fiber; a sorting module for sorting the laser scattering signals in the plurality of signal sequences according to the sampling time points corresponding to each laser scattering signal in the plurality of signal sequences to obtain a target signal sequence; and a temperature measurement module for performing signal analysis on the target signal sequence to determine the optical fiber temperature of the temperature measurement optical fiber.

[0007] In a third aspect, an embodiment of the present application provides an electronic device, which includes: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the optical fiber temperature measurement method described in the first aspect is implemented.

[0008] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the optical fiber temperature measurement method described in the first aspect is implemented.

[0009] In a fifth aspect, an embodiment of the present application provides a computer program product, and when the instructions in the computer program product are executed by the processor of the electronic device, the electronic device is enabled to execute the optical fiber temperature measurement method described in the first aspect.

[0010] As can be seen from the above content, in the embodiment of the present application, by performing delayed acquisition on the laser scattering signal, a plurality of signal sequences with different delays are obtained. Then, according to the sampling time points of the laser scattering signals in each signal sequence, the laser scattering signals in the plurality of signal sequences with different delays are sorted. The sampling frequency corresponding to two adjacent laser scattering signals in the obtained target signal sequence is higher than the sampling frequency of the original laser scattering signal. Therefore, on the basis of not increasing the sampling rate of the data acquisition unit, the spatial resolution of the optical fiber temperature measurement system can be improved, the sampling rate of the backscattered light in the optical fiber temperature measurement system and the hardware requirements of the data acquisition unit are reduced, the cost of the optical fiber temperature measurement system is reduced, and at the same time, the flexibility of adjusting the spatial resolution of the optical fiber temperature measurement system is improved. Description of the Drawings

[0011] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0012] Figure 1 It is a schematic structural diagram of an optical fiber temperature measurement system provided by an embodiment of the present application;

[0013] Figure 2 It is a schematic flowchart of an optical fiber temperature measurement method provided by an embodiment of the present application;

[0014] Figure 3 It is a schematic flowchart of an optical fiber temperature measurement method in a time delay scenario provided by an embodiment of the present application;

[0015] Figure 4 It is a schematic flowchart of an optical fiber temperature measurement method in a time delay scenario provided by an embodiment of the present application;

[0016] Figure 5 It is a schematic flowchart of an optical fiber temperature measurement method in a time delay scenario provided by an embodiment of the present application;

[0017] Figure 6 It is a schematic flowchart of an optical fiber temperature measurement method in a time delay scenario provided by an embodiment of the present application;

[0018] Figure 7 It is a schematic flowchart of an optical fiber temperature measurement method in a phase delay scenario provided by an embodiment of the present application;

[0019] Figure 8 It is a schematic structural diagram of an optical fiber temperature measurement device provided by another embodiment of the present application;

[0020] Figure 9 It is a schematic structural diagram of an electronic device provided by another embodiment of the present application. Detailed implementation manners

[0021] The following will describe in detail the features and exemplary embodiments of various aspects of the present application. To make the purpose, technical solutions and advantages of the present application clearer, the following will further describe the present application in detail in combination with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0022] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0023] For ease of understanding, before explaining the solution provided in this application, the background of the solution provided in this application will be explained first.

[0024] The optical fiber temperature measurement and sensing system is a distributed sensing system, which can be applied to long-distance high-precision temperature acquisition and real-time temperature status monitoring, meeting the requirements of fire monitoring scenarios such as pipelines, buildings, battery packs, and monitoring in thermal management systems and other applications.

[0025] The spatial resolution of a temperature measurement system based on optical fiber backscattering depends on at least one of the pulse width of the pulsed laser, the sampling rate of the backscattered light, and the dispersion compensation algorithm. On the premise that the dispersion compensation algorithm can effectively compensate for the wavelength dispersion introduced when the Stokes light and anti-Stokes light in the backscattered light are transmitted in the optical fiber, the narrower the pulse width of the pulsed laser and the higher the sampling rate of the backscattered light, the higher the spatial resolution of the optical fiber temperature measurement system. The highest spatial resolution SR1 that the optical fiber temperature measurement system can achieve can be calculated from the pulse width of the pulsed laser, and the highest spatial resolution SR2 that the optical fiber temperature measurement system can achieve can be calculated from the sampling rate of the backscattered light. The highest spatial resolution of the temperature measurement optical fiber system is determined by SR1 and SR2. Generally, the highest spatial resolution of the optical fiber temperature measurement system is the larger of SR1 and SR2.

[0026] In the related art, to improve the spatial resolution of the optical fiber temperature measurement system, it is usually necessary to simultaneously compress the pulse width of the pulsed laser and increase the sampling rate of the backscattered light. However, to increase the sampling rate of the backscattered light, the optical fiber temperature measurement system requires a data acquisition unit that supports a higher sampling rate for the backscattered light signal, which simultaneously increases the bandwidth of data transmission and processing. This method significantly increases the hardware cost of the optical fiber temperature measurement system.

[0027] To solve the problems of the prior art, the embodiments of this application provide an optical fiber temperature measurement method and an optical fiber temperature measurement device. The optical fiber temperature measurement system can be the execution subject of the optical fiber temperature measurement method provided in the embodiments of this application. In one example,Figure 1 shows a schematic structural diagram of an optical fiber temperature measurement system, as Figure 1 shown, the optical fiber temperature measurement system includes a laser generator 10, a laser control unit 11, a data acquisition unit 12, a temperature measurement optical fiber 13, a signal detection unit 14, and a data processing unit 15.

[0028] In Figure 1 it, the laser control unit 11 generates a laser drive signal and sends it to the laser generator 10, so that the laser generator 10 generates pulsed laser light and injects it into the temperature measurement optical fiber 13. When the pulsed laser light acts on the temperature measurement optical fiber 13, the backward scattered light generated by the temperature measurement optical fiber 13 is collected by the signal detection unit 14 and converted into an electrical signal. The laser control unit 11 controls the data acquisition unit 12 to perform synchronous quantization acquisition on the electrical signal output by the signal detection unit 14. Under the control of the laser control unit 11, the data processing unit 15 analyzes the data quantized and acquired by the data acquisition unit 12, and calculates the temperature of the temperature measurement optical fiber based on the correlation between the scattered intensities of different wavelengths and temperature.

[0029] The following introduces the optical fiber temperature measurement method provided by the embodiments of the present application in combination with the optical fiber temperature measurement system.

[0030] Figure 2 shows a schematic structural diagram of an optical fiber temperature measurement system provided by an embodiment of the present application. As Figure 2 shown, the method includes the following steps S201 to step S204:

[0031] Step S201, in response to a temperature measurement instruction, generate a laser delay signal.

[0032] In step S201, the temperature measurement instruction may be an instruction sent by a user to the optical fiber temperature measurement system. After receiving the instruction, the optical fiber temperature measurement system generates a laser delay signal, so that the data acquisition unit performs multiple delayed acquisitions on the same laser scattered signal, or acquires the laser scattered signal after multiple delays, in order to analyze the acquired laser scattered signal and perform optical fiber temperature measurement according to the analysis result.

[0033] In the embodiments of the present application, the laser delay signal includes multiple delay parameters, and all of the multiple delay parameters are time delay parameters or phase delay parameters. That is, in the embodiments of the present application, the optical fiber temperature measurement system can implement optical fiber temperature measurement in a time delay manner, or can implement optical fiber temperature measurement in a phase delay manner.

[0034] In the embodiment of the present application, the time delay parameter includes a delay time, and the time intervals between adjacent two of the delay times corresponding to multiple time delay parameters are equal. That is, in the embodiment of the present application, multiple delay times with the same time interval are used to delay the pulsed laser or the acquisition time of the laser scattering signal, so as to improve the spatial resolution of the optical fiber temperature measurement system.

[0035] The phase delay parameter includes a delay phase, and the phase intervals between adjacent two of the delay phases corresponding to multiple phase delay parameters are equal. That is, in the embodiment of the present application, multiple delay phases with equal phase intervals are used to delay the acquisition of the laser scattering signal, so as to achieve the effect of improving the spatial resolution of the optical fiber temperature measurement system.

[0036] Step S202: Delay and acquire the laser scattering signal according to multiple delay parameters to obtain multiple signal sequences.

[0037] In step S202, each signal sequence includes the laser scattering signal acquired under the corresponding delay parameter, where the laser scattering signal is the scattered light signal generated by the temperature measurement optical fiber after the pulsed laser is injected into the temperature measurement optical fiber.

[0038] In one embodiment, the optical fiber temperature measurement system can delay the same pulsed laser multiple times through multiple delay parameters to obtain multiple delayed laser scattering signals, and then the data acquisition unit performs signal acquisition on the multiple delayed laser scattering signals according to the original acquisition frequency, so as to obtain multiple signal sequences.

[0039] In another embodiment, the optical fiber temperature measurement system can also delay the acquisition time of the data acquisition unit to obtain multiple time delay sequences, and perform signal acquisition on the same laser scattering signal under each time delay sequence, so as to obtain the corresponding signal sequences.

[0040] Step S203: Sort the laser scattering signals in the multiple signal sequences according to the sampling time points corresponding to each laser scattering signal in the multiple signal sequences to obtain a target signal sequence.

[0041] In step S203, the time interval of the sampling time points corresponding to the laser scattering signals in the target signal sequence obtained by sorting the laser scattering signals in multiple signal sequences is smaller than the time interval of the sampling time points corresponding to the laser scattering signals in the signal sequences. For example, if the sampling time points corresponding to the first signal sequence are [0.10, 0.20, 0.30, 0.40, 0.50] and the sampling time points corresponding to the second signal sequence are [0.15, 0.25, 0.35, 0.45, 0.55], then the sampling time points corresponding to the target signal sequence are [0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55]. The sampling interval corresponding to the first signal sequence and the second signal sequence is 0.10, while the time interval of the sampling time points corresponding to the target signal sequence is 0.05. Thus, it can be seen that in the embodiment of the present application, without increasing the data acquisition frequency of the data acquisition unit, the spatial resolution of the optical fiber temperature measurement system can also be improved.

[0042] Step S204: Perform signal analysis on the target signal sequence to determine the optical fiber temperature of the temperature measurement optical fiber.

[0043] In step S204, the data processing unit can analyze the target signal sequence according to the correlation relationship between the intensities of scattered light of different wavelengths and temperature to determine the optical fiber temperature of the temperature measurement optical fiber.

[0044] Since the intensity and wavelength of the backward scattered light of the optical fiber are related to the optical fiber temperature, and different moments in the continuous scattered light signals correspond to different parts of the optical fiber, therefore, in the optical fiber temperature measurement method provided in the embodiment of the present application, temperature-related information can be extracted by analyzing the backward scattered light generated when the pulsed laser acts on the temperature measurement optical fiber.

[0045] It should be noted that the optical fiber temperature measurement technology is a commonly used temperature measurement method, and existing temperature calculation methods can be used to extract the optical fiber temperature. In the embodiment of the present application, no further examples will be given one by one.

[0046] Based on the solution defined in the above steps S201 to S204, it can be known that in the embodiment of the present application, by delaying the acquisition of the laser scattering signal, a plurality of signal sequences with different delays are obtained. Then, according to the sampling time points of the laser scattering signals in each signal sequence, the laser scattering signals in the plurality of signal sequences with different delays are sorted. The sampling frequency corresponding to two adjacent laser scattering signals in the obtained target signal sequence is higher than the sampling frequency of the original laser scattering signal. Therefore, without increasing the sampling rate of the data acquisition unit, the spatial resolution of the optical fiber temperature measurement system can be improved, the sampling rate of the backscattered light in the optical fiber temperature measurement system and the hardware requirements of the data acquisition unit are reduced, the cost of the optical fiber temperature measurement system is reduced, and at the same time, the flexibility of adjusting the spatial resolution of the optical fiber temperature measurement system is improved.

[0047] The implementation process of the method provided in the embodiment of the present application will be introduced below by taking the temperature measurement methods under two methods of time delay and phase delay respectively.

[0048] For time delay, in addition to the Figure 1 shown units or modules, the optical fiber temperature measurement system also includes a time delay control unit 16, as Figure 3 shown. The time delay control unit 16 can delay the laser drive signal generated by the laser control unit 11 to achieve the delay of the pulsed laser generated by the laser generator 10, that is, the time delay control unit 16 can provide drive signals with different time delay amounts for the laser generator 10. As an example, the above time delay control unit 16 can be a digital programmable delay chip, and among them, the time delay control unit 16 can select the method of an electrically controlled optical fiber delay line to realize the adjustment of the delay time.

[0049] In one embodiment, the optical fiber temperature measurement system obtains a plurality of delay times generated by the time delay control unit, and then adjusts the signal generation time of the laser drive signal according to the plurality of delay times to obtain a plurality of signal generation times; controls the laser control unit to generate a plurality of laser drive signals at the plurality of signal generation times; obtains the pulsed laser generated by the laser generator under the plurality of laser drive signals; and collects the laser scattering signals generated by the pulsed laser in the temperature measurement optical fiber under each laser drive signal to obtain a plurality of signal sequences.

[0050] In the above embodiment, the laser drive signal is a signal generated by the laser control unit and used to drive the laser generator to generate a pulsed laser.

[0051] In one embodiment, in Figure 4In the optical fiber temperature measurement system shown, the laser control unit 11 includes a drive signal generation unit 111 and a time delay setting unit 112. The drive signal generation unit 111 is used to generate a laser drive signal for driving a laser generator to generate pulsed laser light. The time delay setting unit 112 is used to set the delay time of the time delay control unit 16, thereby generating a variable time delay amount for the laser drive signal. Therefore, in the embodiment of the present application, the time delay control unit 16 can adjust the time when the pulsed laser acts on the temperature measurement optical fiber, and further adjust the time delay amount between the data acquisition unit 12 and the backward laser scattering signal. In addition, the laser control unit 11 can also notify the data acquisition unit 12 to perform data sampling and notify the data processing unit 15 to perform data analysis by sending a trigger pulse.

[0052] By setting different time delay amounts of the time delay control unit 16 through the time delay setting unit 112, different sampling time delays of the ADC (Analog to Digital Converter) in the data acquisition unit 12 relative to the backward laser scattering signal are achieved. Compared with the related art, the solution provided in the embodiment of the present application equivalently improves the sampling rate of the backward scattered light through time division multiplexing. On the premise that the pulse width of the pulsed laser can be reduced without limitation, the spatial resolution of the temperature measurement system can be improved.

[0053] It should be noted that the backward laser scattering signal is a continuous analog quantity, while the sampling of the ADC is discrete, and its interval is equal to the sampling period. For a repeatable backward laser scattering signal, by adjusting the time delay amount of the ADC, the backward laser scattering signal is sampled at different times, thereby equivalently increasing the sampling rate. In this time division multiplexing method, a higher spatial resolution is obtained by increasing the sampling time.

[0054] As an example, in the embodiment of the present application, the time delay setting unit 112 can set the delay time for different time delay control units 16. For example, the delay time of the time delay control unit 16 is set at equal intervals. If the sampling rate of the data acquisition unit 12 is fs, the delay time can be set to m / (nfs), where m = 0, 1,..., n - 1, to equivalently increase the sampling rate of the data acquisition unit 12, that is, the equivalent sampling rate of the data acquisition unit 12 is nfs.

[0055] In another embodiment, Figure 5 Another optical fiber temperature measurement system is shown. In this optical fiber temperature measurement system, the time delay control unit 16 is arranged between the laser generator 10 and the temperature measurement optical fiber 13. Through the optical fiber temperature measurement system with this structure, the ADC in the data acquisition unit 12 can also perform delayed sampling on the backward laser scattering signal at different delay times.

[0056] Specifically, first, obtain multiple delay times generated by the time delay control unit; then, adjust the pulsed laser generated by the laser generator according to the multiple delay times respectively to obtain multiple delayed pulsed lasers; next, inject the multiple delayed pulsed lasers into the temperature measurement optical fiber respectively to obtain the laser scattering signals corresponding to each delayed pulsed laser; finally, collect the laser scattering signals corresponding to each delayed pulsed laser, and multiple signal sequences can be obtained.

[0057] In the above embodiment, each delayed pulsed laser corresponds to a delay time. That is, in this embodiment, the time delay control unit 16 is used to delay the pulsed laser generated by the laser generator. For the data acquisition unit 12, it can acquire laser scattering signals with different experiments.

[0058] In another embodiment, Figure 6 Another optical fiber temperature measurement system is shown. In this optical fiber temperature measurement system, the time delay control unit 16 is arranged between the laser control unit 11 and the data acquisition unit 12. Through this structure of the optical fiber temperature measurement system, the ADC in the data acquisition unit 12 can also perform delayed sampling on the backward laser scattering signal at different delay times.

[0059] Specifically, the data acquisition unit 12 obtains multiple delay times generated by the time delay control unit 16, and then adjusts the signal acquisition time of the signal acquisition unit according to the multiple delay times respectively for delay to obtain multiple delayed acquisition times; then, collect the laser scattering signal multiple times according to the multiple delayed acquisition times to obtain multiple signal sequences.

[0060] In this embodiment, the data acquisition time of the data acquisition unit 12 is delayed. For example, the original data acquisition time is [0.10, 0.20, 0.30, 0.40, 0.50]. After delaying it, the delayed data acquisition time is [0.15, 0.25, 0.35, 0.45, 0.55]. Thus, the data acquisition unit 12 can acquire the same laser scattering signal at the data acquisition times corresponding to multiple delay times, and multiple signal sequences can be obtained.

[0061] So far, the introduction of the optical fiber temperature measurement method in the time delay mode is completed.

[0062] As can be seen from the above, in the embodiments of the present application, the time delay control unit adjusts the time delay amount between data acquisition and the laser scattering signal multiple times, and combined with time division multiplexing, the sampling rate of the backward laser scattering signal can be equivalently increased, thereby improving the spatial resolution of the optical fiber temperature measurement system. Compared with the traditional method for improving the spatial resolution, the solution provided by the embodiments of the present application can reduce the sampling rate of the backward laser scattering signal and the requirements for the data acquisition unit, reducing the cost of the optical fiber temperature measurement system. Moreover, by adjusting the time delay amount of the time delay control unit, the adjustment flexibility of the spatial resolution of the optical fiber temperature measurement system can also be improved.

[0063] Regarding the phase delay, the corresponding optical fiber temperature measurement system includes Figure 1 each unit or module shown in the figure. Different from the optical fiber temperature measurement system corresponding to the time delay, the laser control unit 11 in the optical fiber temperature measurement system corresponding to the phase delay is used to implement timing control. In this embodiment, the laser control unit 11 controls the laser generator 10 to generate pulsed laser and inject it into the temperature measurement optical fiber 13. The signal detection unit 14 uses a wavelength division multiplexer to separate the Stokes light and anti-Stokes light in the backward scattered light generated when the pulsed laser acts on the temperature measurement optical fiber 13, collects the Stokes light and anti-Stokes light respectively, and performs signal conversion to obtain an electrical signal. The laser control unit 11 controls the data acquisition unit 12 to synchronously quantize and acquire the above electrical signals driven by the clock signals corresponding to different phase delays. The data processing unit 15 analyzes the data after quantization acquisition to determine the temperature of the optical fiber. In the embodiments of the present application, the laser control unit 11 provides sampling signals with different phase delays for the data acquisition unit 12.

[0064] In one embodiment, the optical fiber temperature measurement system acquires the same-frequency clock signals corresponding to each delay phase, and then, under the same-frequency clock signals corresponding to each delay phase, acquires the laser scattering signals to obtain multiple signal sequences.

[0065] Specifically, the optical fiber temperature measurement system can respond to the clock switching instruction to switch the first same-frequency clock signal in the first delay phase to the second same-frequency clock signal in the second delay phase; then, acquire the signal acquisition duration corresponding to the second delay phase, and within the signal acquisition duration, acquire the laser scattering signals with the second same-frequency clock to obtain the signal sequence corresponding to the second delay phase. Repeating this process can obtain multiple signal sequences.

[0066] In one example, Figure 7 shows a schematic structural diagram of the optical fiber temperature measurement system in the phase delay scenario, as Figure 7As shown, in the phase delay scenario, the laser control module is used to implement the timing control of the laser. It includes a clock management unit 113 and a clock generation unit 114. Among them, the clock management unit 113 is used to switch between the same-frequency sampling clocks of different phases, that is, to control the working time of the optical fiber temperature measurement system under different phase delay sampling clocks. Specifically, it controls the optical fiber temperature measurement system to work for times of t1, t2, … tN respectively under N different phase delays. The clock management unit 113 is used to control the clock generation unit 114 to synthesize the same-frequency clock signals with different phase delays relative to the pulsed laser. The analog-to-digital converter ADC in the data acquisition unit 12 works in a time-division switching manner under the same-frequency clocks of different phase delays to sample the output signals of the signal detection unit 14; the data processing unit 15 identifies the data when working in different phase delay states under the trigger of the clock management unit 113.

[0067] Compared with the related technology, the method provided by the embodiment of the present application equivalently improves the sampling rate of the backward laser scattered light through the time-division multiplexing method. On the basis that the pulse width of the pulsed laser can be unrestrictedly reduced, the spatial resolution of the optical fiber temperature measurement system is effectively improved.

[0068] It should be noted that in the above embodiment, the phase delays can be selected at equal intervals. For example, if 0° and 180° are selected, the equivalent sampling rate of the data acquisition unit can be doubled; for another example, if 0°, 120° and 240° are selected for the phase delays, the equivalent sampling rate of the data acquisition unit can be tripled.

[0069] In addition, in the embodiment of the present application, the signal acquisition durations corresponding to multiple delay phases are the same, that is, the time for the data acquisition unit to work in different phase delay intervals is equal.

[0070] In the embodiment of the present application, the clock management unit 113 and the clock generation unit 114 can use an FPGA (Field Programmable Gate Array) with an internally integrated phase-locked loop. The clock generation unit 114 can generate different time delays based on the phase-locked loop of the FPGA, and the clock management unit 113 completes the switching of the clock signals with different time delays. Further, the data processing unit 15 can also be integrated into the above-mentioned FPGA.

[0071] So far, the introduction of the optical fiber temperature measurement method in the phase delay mode is completed.

[0072] As can be seen from the above, the embodiment of the present application introduces a phase delay sampling method in the fiber optic temperature measurement system. Specifically, a laser control unit capable of implementing timing control is added to the fiber optic temperature measurement system to adjust the phase between the pulsed laser and the data acquisition unit, equivalently improving the sampling rate, and further enhancing the spatial resolution of the fiber optic temperature measurement system. Compared with the method for improving the resolution in the related art, the embodiment of the present application reduces the sampling rate of the backscattered light and the requirements for the data acquisition unit through the phase delay sampling method, reduces the hardware cost of the fiber optic temperature measurement system, and simultaneously reduces the bandwidth of data transmission and processing. In addition, by adjusting the delay phase of the clock generation unit, the flexibility of adjusting the spatial resolution of the fiber optic temperature measurement system is improved within the input bandwidth range of the analog-to-digital converter of the data acquisition unit.

[0073] Thus, the introduction of the method provided by the embodiment of the present application is completed.

[0074] In practical applications, users can select any one of the time delay and phase delay methods according to actual needs to achieve fiber optic temperature measurement.

[0075] The embodiment of the present application also provides a fiber optic temperature measurement device, as Figure 8 shown. The device 800 includes: a delay module 801, an acquisition module 802, a sorting module 803, and a temperature measurement module 804.

[0076] The delay module 801 is configured to generate a laser delay signal in response to a temperature measurement instruction, where the laser delay signal includes a plurality of delay parameters, and all the plurality of delay parameters are time delay parameters or phase delay parameters;

[0077] The acquisition module 802 is configured to perform delayed acquisition on the laser scattering signal according to the plurality of delay parameters to obtain a plurality of signal sequences, where each signal sequence includes the laser scattering signal collected under the corresponding delay parameter, and the laser scattering signal is the scattering light signal generated by the temperature measurement optical fiber after the pulsed laser is injected into the temperature measurement optical fiber;

[0078] The sorting module 803 is configured to sort the laser scattering signals in the plurality of signal sequences according to the sampling time points corresponding to each laser scattering signal in the plurality of signal sequences to obtain a target signal sequence;

[0079] The temperature measurement module 804 is configured to perform signal analysis on the target signal sequence to determine the temperature of the temperature measurement optical fiber.

[0080] In one embodiment, the time delay parameter includes a delay time, and the time intervals between adjacent two of the delay times corresponding to the plurality of time delay parameters are equal.

[0081] In one embodiment, the acquisition module includes: a first time delay acquisition module, configured to obtain a plurality of delay times generated by a time delay control unit; respectively adjust the signal generation time of a laser drive signal according to the plurality of delay times to obtain a plurality of signal generation times, where the laser drive signal is generated by a laser control unit and is used to drive a laser generator to generate pulsed laser; control the laser control unit to generate a plurality of laser drive signals at the plurality of signal generation times; obtain the pulsed laser generated by the laser generator under the plurality of laser drive signals; collect the laser scattering signals generated by the pulsed laser in a temperature measurement optical fiber under each laser drive signal to obtain a plurality of signal sequences.

[0082] In one embodiment, the acquisition module includes: a second time delay acquisition module, configured to obtain a plurality of delay times generated by a time delay control unit; respectively adjust the pulsed laser generated by the laser generator according to the plurality of delay times to obtain a plurality of delayed pulsed lasers, where each delayed pulsed laser corresponds to a delay time; inject the plurality of delayed pulsed lasers into the temperature measurement optical fiber respectively, and obtain the laser scattering signals corresponding to each delayed pulsed laser; collect the laser scattering signals corresponding to each delayed pulsed laser to obtain a plurality of signal sequences.

[0083] In one embodiment, the acquisition module includes: a third time delay acquisition module, configured to obtain a plurality of delay times generated by a time delay control unit; respectively delay the signal acquisition time of a signal acquisition unit according to the plurality of delay times to obtain a plurality of delayed acquisition times; perform multiple acquisitions on the laser scattering signal according to the plurality of delayed acquisition times to obtain a plurality of signal sequences.

[0084] In one embodiment, the phase delay parameter includes a delay phase, and the phase intervals between adjacent two of the delay phases corresponding to the plurality of phase delay parameters are equal.

[0085] In one embodiment, the acquisition module includes: a clock acquisition module and a phase delay module. The clock acquisition module is configured to obtain a co-frequency clock signal corresponding to each delay phase; the phase delay module is configured to collect the laser scattering signal under the co-frequency clock signal corresponding to each delay phase to obtain a plurality of signal sequences.

[0086] In one embodiment, the phase delay module is specifically configured to, in response to a clock switching instruction, switch the first co-frequency clock signal in the first delay phase to the second co-frequency clock signal in the second delay phase; obtain the signal acquisition duration corresponding to the second delay phase; within the signal acquisition duration, perform signal acquisition on the laser scattering signal with the second co-frequency clock to obtain the signal sequence corresponding to the second delay phase.

[0087] In one embodiment, the signal acquisition durations corresponding to the plurality of delay phases are the same.

[0088] The optical fiber temperature measurement device provided by the embodiment of the present application can implement each process implemented by the foregoing method embodiment. To avoid repetition, it will not be elaborated here.

[0089] Those skilled in the art can clearly understand that for the convenience and brevity of description, only the above division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of distinguishing each other and do not limit the protection scope of the present application. The specific working process of the units and modules in the above system can refer to the corresponding process in the foregoing method embodiment and will not be elaborated here.

[0090] Figure 9 The hardware structure diagram of the electronic device provided by the embodiment of the present application is shown.

[0091] The electronic device may include a processor 901 and a memory 902 storing computer program instructions.

[0092] Specifically, the above processor 901 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiment of the present application.

[0093] The memory 902 may include a mass storage for data or instructions. By way of example and not limitation, the memory 902 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In a suitable case, the memory 902 may include a removable or non-removable (or fixed) medium. In a suitable case, the memory 902 may be internal or external to the integrated gateway disaster recovery device. In a specific embodiment, the memory 902 is a non-volatile solid state memory.

[0094] The memory may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Thus, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to one aspect of the present disclosure.

[0095] The processor 901 realizes any one of the optical fiber temperature measurement methods in the above embodiments by reading and executing the computer program instructions stored in the memory 902.

[0096] In one example, the electronic device may further include a communication interface 903 and a bus 910. Among them, as Figure 9 shown, the processor 901, the memory 902, and the communication interface 903 are connected through the bus 910 and complete communication with each other.

[0097] The communication interface 903 is mainly used to implement communication between each module, device, unit, and / or device in the embodiments of the present application.

[0098] The bus 910 includes hardware, software, or both, and couples the components of the electronic device to each other. By way of example and not limitation, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses or a combination of two or more of these. In a suitable case, the bus 910 may include one or more buses. Although the embodiments of the present application describe and illustrate specific buses, the present application contemplates any suitable bus or interconnect.

[0099] In addition, in combination with the optical fiber temperature measurement method in the above embodiments, the embodiments of the present application may provide a computer-readable storage medium to implement. Computer program instructions are stored on the computer-readable storage medium; when the computer program instructions are executed by a processor, any one of the optical fiber temperature measurement methods in the above embodiments is realized.

[0100] In addition, in combination with the optical fiber temperature measurement method in the above embodiments, an embodiment of the present application can provide a computer program product to implement. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device is caused to execute and implement any one of the optical fiber temperature measurement methods in the above embodiments.

[0101] It should be clear that the present application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order between steps, after understanding the spirit of the present application.

[0102] The functional modules shown in the structural block diagrams described above can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a functional card, and so on. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted via a data signal carried in a carrier wave on a transmission medium or a communication link. A "machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical discs, hard disks, fiber optic media, radio frequency (RF) links, and so on. The code segment can be downloaded via a computer network such as the Internet, an intranet, and so on.

[0103] It should also be noted that the exemplary embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be executed in the order mentioned in the embodiments, or different from the order in the embodiments, or several steps can be executed simultaneously.

[0104] Aspects of the present disclosure have been described above with reference to the flowchart(s) and / or block diagram(s) of methods and apparatus for measuring temperature using an optical fiber according to embodiments of the present disclosure. It should be understood that each block in the flowchart(s) and / or block diagram(s), and combinations of blocks in the flowchart(s) and / or block diagram(s), can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing apparatus enable the implementation of the functions / acts specified in one or more blocks of the flowchart(s) and / or block diagram(s). Such a processor can be, but is not limited to, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and / or flowchart diagrams, and combinations of blocks in the block diagrams and / or flowchart diagrams, can also be implemented by dedicated hardware performing the specified functions or acts, or by combinations of dedicated hardware and computer instructions.

[0105] As described above, the foregoing is only a specific implementation manner of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and these modifications or substitutions should all be covered by the protection scope of the present application.

Claims

1. An optical fiber temperature measurement method, characterized in that, Including: In response to a temperature measurement instruction, generating a laser delay signal, where the laser delay signal includes a plurality of delay parameters, and all of the plurality of delay parameters are time delay parameters or phase delay parameters; Delayed acquisition of the laser scattering signal according to the plurality of delay parameters to obtain a plurality of signal sequences, where each signal sequence includes the laser scattering signal acquired under the corresponding delay parameter, and the laser scattering signal is the scattered light signal generated by the temperature measurement optical fiber after pulsed laser is injected into the temperature measurement optical fiber; Sorting the laser scattering signals in the plurality of signal sequences according to the sampling time points corresponding to each laser scattering signal in the plurality of signal sequences to obtain a target signal sequence; Performing signal analysis on the target signal sequence to determine the fiber temperature of the temperature measurement optical fiber.

2. The method according to claim 1, characterized in that, The time delay parameter includes a delay time, and the time intervals between adjacent two of the delay times corresponding to the plurality of time delay parameters are equal.

3. The method according to claim 2, wherein The delayed acquisition of the laser scattering signal according to the plurality of delay parameters to obtain a plurality of signal sequences includes: Obtaining a plurality of delay times generated by a time delay control unit; Respectively adjusting the signal generation time of the laser drive signal according to the plurality of delay times to obtain a plurality of signal generation times, where the laser drive signal is generated by a laser control unit and is used to drive a laser generator to generate pulsed laser; Controlling the laser control unit to generate a plurality of laser drive signals at the plurality of signal generation times; Obtaining the pulsed laser generated by the laser generator under the plurality of laser drive signals; Acquiring the laser scattering signal generated by the pulsed laser in the temperature measurement optical fiber under each laser drive signal to obtain the plurality of signal sequences.

4. The method according to claim 2, wherein The delayed acquisition of the laser scattering signal according to the plurality of delay parameters to obtain a plurality of signal sequences includes: Obtaining a plurality of delay times generated by a time delay control unit; Respectively adjusting the pulsed laser generated by the laser generator according to the plurality of delay times to obtain a plurality of delayed pulsed lasers, where each delayed pulsed laser corresponds to a delay time; Injecting the plurality of delayed pulsed lasers into the temperature measurement optical fiber respectively, and obtaining the laser scattering signal corresponding to each delayed pulsed laser; Acquiring the laser scattering signal corresponding to each delayed pulsed laser to obtain the plurality of signal sequences.

5. The method according to claim 2, characterized in that The delayed acquisition of the laser scattering signal according to the plurality of delay parameters to obtain a plurality of signal sequences includes: Obtaining a plurality of delay times generated by a time delay control unit; Respectively adjusting the signal acquisition time of a signal acquisition unit to be delayed according to the plurality of delay times to obtain a plurality of delayed acquisition times; Performing multiple acquisitions on the laser scattering signal according to the plurality of delayed acquisition times to obtain the plurality of signal sequences.

6. The method according to claim 1, characterized in that, The phase delay parameter includes a delay phase, and the phase intervals between adjacent two of the delay phases corresponding to the plurality of phase delay parameters are equal.

7. The method according to claim 6, characterized in that, The delayed acquisition of the laser scattering signal according to the plurality of delay parameters to obtain a plurality of signal sequences includes: Obtain the same-frequency clock signals corresponding to each delay phase; Under the same-frequency clock signals corresponding to each of the delay phases, collect the laser scattering signals to obtain the multiple signal sequences.

8. The method according to claim 7, characterized in that, The collecting the laser scattering signals under the same-frequency clock signals corresponding to each of the delay phases to obtain the multiple signal sequences includes: In response to a clock switching instruction, switch the first same-frequency clock signal at the first delay phase to the second same-frequency clock signal at the second delay phase; Obtain the signal acquisition duration corresponding to the second delay phase; Within the signal acquisition duration, collect the laser scattering signals with the second same-frequency clock to obtain the signal sequence corresponding to the second delay phase.

9. The method according to claim 8, wherein The signal acquisition durations corresponding to the multiple delay phases are the same.

10. An optical fiber temperature measuring device, characterized in that, It includes: A delay module, configured to generate a laser delay signal in response to a temperature measurement instruction, where the laser delay signal includes multiple delay parameters, and the multiple delay parameters are all time delay parameters or phase delay parameters; An acquisition module, configured to perform delayed acquisition on the laser scattering signals according to the multiple delay parameters to obtain multiple signal sequences, where each signal sequence includes the laser scattering signals collected under the corresponding delay parameter, and the laser scattering signals are the scattered light signals generated by the temperature measurement optical fiber after pulsed laser is injected into the temperature measurement optical fiber; A sorting module, configured to sort the laser scattering signals in the multiple signal sequences according to the sampling time points corresponding to each laser scattering signal in the multiple signal sequences to obtain a target signal sequence; A temperature measurement module, configured to perform signal analysis on the target signal sequence to determine the fiber temperature of the temperature measurement optical fiber.

Images