Time synchronization method, device, equipment and medium for transmitting weak current signals

Abstract

The embodiment of the present invention provides a time synchronization method, device, equipment and medium for transmitting weak current signals. The method includes: using a task management module to obtain time information released by a clock source in a time synchronization device, and synchronously sending the time information to a time synchronization module, the time synchronization module receives the time information, and sends a coding sequence generated according to a preset coding rule to a light source control module; the light source control module converts the coding sequence into an optical analog signal with time information, and after sending the optical analog signal to an optical fiber slip ring sub-device, the optical fiber slip ring sub-device is used to poll and transmit the optical analog signal to an optical fiber terminal device for modulation to generate an optical analog signal, and the modulated optical analog signal is returned to an optoelectronic signal processing sub-device; the optoelectronic signal processing sub-device analyzes and calculates the modulated optical analog signal to obtain an analog current signal with time information, and thereby obtains a sensor data value with time information.

Description

Technical Field

[0001] The present invention relates to the technical field of data transmission, and in particular to a time synchronization method, system, device and medium for transmitting weak current signals. Background Art

[0002] In the field of signal transmission technology for industrial control systems, physical quantities such as temperature, pressure, flow, and displacement can usually be converted into electrical signals for transmission. The transmission process can be divided into sensor transmission technology and communication transmission technology according to the type of electrical signal. In the field of communication transmission technology, industrial control systems use bus protocols such as Power Link (power connection) for data transmission. However, the protocol coding and time slot control mechanism in the bus communication method will cause a certain time delay in the communication process between different device terminals. Therefore, time information is encoded in the protocol message of data transmission to mark the sending or receiving time of the current signal. Among them, the time information of each device terminal is usually obtained from the clock source through protocols such as NTP (Network Time Protocol) and PTP (Precision Time Protocol).

[0003] In sensor transmission technology, the sensor data output by existing non-intelligent sensors does not have time information. When a polling mechanism is used to collect and transmit sensor data, the time when the sensor data is generated cannot be distinguished, which affects subsequent data analysis. Summary of the invention

[0004] In view of the above problems, a method, device, equipment and medium for time synchronization of transmitting weak current signals are proposed to overcome the above problems or at least partially solve the above problems, including:

[0005] A time synchronization method for transmitting weak current signals is applied to a time synchronization device, wherein the time synchronization device comprises a photoelectric signal processing sub-device, an optical fiber terminal device, and an optical fiber slip ring sub-device, wherein the photoelectric signal processing sub-device comprises a task management module, a time synchronization module, and a light source control module, and the method comprises:

[0006] The task management module is used to obtain the time information released by the clock source in the time synchronization device, and the time information is synchronously sent to the time synchronization module;

[0007] After the time synchronization module receives the time information, the time information is encoded according to a preset encoding rule to obtain an encoding sequence, and the encoding sequence is sent to the light source control module;

[0008] The light source control module converts the coding sequence into an optical analog signal with the time information, and after the optical analog signal is sent to the optical fiber slip ring sub-device, the optical fiber slip ring sub-device is used to transmit the optical analog signal to the optical fiber terminal device in a polling manner;

[0009] Modulating the optical analog signal by an analog current signal in the optical fiber terminal device, and transmitting the modulated optical analog signal back to the optoelectronic signal processing sub-device;

[0010] The modulated optical analog signal is analyzed and calculated by the photoelectric signal processing sub-device to obtain an analog current signal with the time information, and a sensor data value with the time information is obtained based on the analog current signal, so as to synchronize the time of multiple sensor devices used to collect sensor data values.

[0011] Optionally, converting the coding sequence into an optical analog signal with the time information by the light source control module includes:

[0012] In response to a first operation instruction for starting time synchronization, the light source control module is controlled to drive a preset light source to generate a light simulation signal according to the coding sequence, wherein the signal waveform of the light simulation signal is a rectangular wave, and the first half information of the rectangular wave is time information.

[0013] Optionally, the adopting the optical fiber slip ring sub-device to transmit the optical analog signal to the optical fiber terminal device in a polling manner comprises:

[0014] After the optical fiber slip ring sub-device detects the rising edge of the rectangular wave to trigger a reset, the optical analog signal is sequentially transmitted to the optical fiber terminal device for signal modulation through multiple physical channels.

[0015] Optionally, it also includes:

[0016] During the preset time when the multiple physical channels are opened, the optical fiber terminal device is used to receive continuous laser pulses and optical waveforms corresponding to the time information.

[0017] Optionally, it also includes:

[0018] In response to a second operation instruction for shutting down time synchronization, the light source control module is controlled to shut down the preset light source.

[0019] Optionally, encoding the time information according to a preset encoding rule to obtain a coding sequence includes:

[0020] The time information is encoded using a binary encoding rule to obtain a coding sequence.

[0021] Optionally, the adopting binary coding to encode the time information to obtain a coding sequence includes:

[0022] Binary-encode the time information in the time information to obtain first coded information;

[0023] Binary-encode the sub-information in the time information to obtain second coded information;

[0024] Binary-encode the second information in the time information to obtain third coded information;

[0025] The first coding information, the second coding information and the third coding information are combined to generate a coding sequence.

[0026] Optionally, the method further comprises:

[0027] The time synchronization device is calibrated, and after the calibration is successful, the time information is encoded according to a preset encoding rule.

[0028] Optionally, the photoelectric signal processing sub-device includes a photoelectric detector and a signal processing module, and the photoelectric signal processing sub-device performs analytical calculation on the modulated optical analog signal to obtain an analog current signal with the time information, and obtains a sensing data value with the time information based on the analog current signal, including:

[0029] Performing photoelectric conversion on the modulated optical analog signal through the photodetector to obtain an analog current signal carrying the time information, and sending the analog current signal carrying the time information to a signal processing module;

[0030] The analog current signal carrying the time information is analyzed based on the signal processing module to obtain a sensing data value carrying the time information.

[0031] Optionally, the parsing the analog current signal carrying the time information based on the signal processing module to obtain the sensing data value carrying the time information includes:

[0032] Converting the analog current signal into a coding sequence corresponding to a preset coding rule;

[0033] The sensor data value with time information is determined according to the coding sequence.

[0034] A time synchronization device, comprising an optoelectronic signal processing sub-device, an optical fiber terminal device and an optical fiber slip ring sub-device, wherein the optoelectronic signal processing sub-device comprises a task management module, a time synchronization module and a light source control module, wherein:

[0035] The task management module is used to obtain the time information released by the clock source in the time synchronization device, and synchronously send the time information to the time synchronization module;

[0036] The time synchronization module is used to encode the time information according to a preset encoding rule to obtain a coding sequence, and send the coding sequence to the light source control module;

[0037] The light source control module is used to convert the coding sequence into an optical analog signal with the time information, and after sending the optical analog signal to the optical fiber slip ring sub-device, the optical fiber slip ring sub-device is used to transmit the optical analog signal to the optical fiber terminal device through polling;

[0038] The optical fiber terminal device is used to modulate the optical analog signal through the analog current signal, and the modulated optical analog signal is transmitted back to the optoelectronic signal processing sub-device, so that the modulated optical analog signal is analyzed and calculated by the optoelectronic signal processing sub-device to obtain the analog current signal with time information, and thereby obtain the sensor data value with time information.

[0039] Optionally, the time synchronization module is used to encode the time information using a binary encoding rule to obtain a coding sequence.

[0040] Optionally, the photoelectric signal processing sub-device includes a photoelectric detector and a signal processing module, wherein:

[0041] The photodetector is used to perform photoelectric conversion on the modulated optical analog signal to obtain an analog current signal carrying time information, and send the analog current signal carrying the time information to the signal processing module;

[0042] The signal processing module is used to analyze the analog current signal carrying the time information to obtain the sensing data value with the time information.

[0043] An electronic device comprises a processor, a memory and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the time synchronization method for transmitting weak current signals as described above.

[0044] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the time synchronization method for transmitting a weak current signal as described above is implemented.

[0045] The embodiments of the present invention have the following advantages:

[0046] In the embodiment of the present invention, the time information released by the clock source can be obtained through the task management module of the time synchronization device, and then synchronously sent to the time synchronization module, and then the time information is encoded according to the preset encoding rule, and the encoding sequence is converted to obtain an optical analog signal carrying the time information, and then the optical analog signal is modulated and processed, and the optical analog signal is sent back to the photoelectric signal processing sub-device for analysis and calculation to obtain an analog current signal with time information, and then the sensor data value with time information is obtained. Therefore, when the sensor data is polled and collected, the time information can be converted into an optical analog signal by using encoding and optical simulation technology, and then the optical analog signal can be used to transmit the time information, and then the modulation and demodulation are combined to mark the time information for each channel of sensor data to distinguish the time when different sensor data are generated, and then the sensor data carrying the time information can be used for data analysis to ensure that it does not affect the subsequent data analysis and mining work. At the same time, in the embodiment of the present invention, the time information released by the same clock source is used to synchronize the different sensor data collected by different sensor devices, and the time information is associated with the different sensor data collected by multiple sensor devices, so that the time synchronization of multiple sensor devices can be achieved.

[0047] In addition, in the embodiment of the present invention, a rectangular wave rising edge trigger mechanism can be designed to use a single optical analog signal to poll and transmit multiple channels of sensor data and time information, so as to improve data processing efficiency.

[0048] In an embodiment of the present invention, by converting time information into a coding sequence with a preset code, so as to convert the time information into an optical analog signal carrying the time information through the coding sequence, a change in data form is achieved, and then the time information can be transmitted through the optical analog signal. In the optical fiber terminal device, one path can input the unmodulated optical analog signal carrying the time information, and the other path can input the original value of the sensor data current (i.e., sensor data). By modulating the two, the association between the time information and the sensor data is achieved, so that time data can be added to the sensor data.

[0049] In the embodiment of the present invention, the association between sensor data and time data and the time synchronization function of each sensor device can be realized by upgrading the time synchronization module. The overall solution has the characteristics of high reliability and easy upgrade. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0051] Figure 1a It is a flowchart of the steps of a time synchronization method for transmitting weak current signals provided by an embodiment of the present invention;

[0052] Figure 1b This is a schematic diagram of data transmission provided by an embodiment of the present invention;

[0053] Figure 2 It is a flowchart of another method for time synchronization of transmitting weak current signals provided by an embodiment of the present invention;

[0054] Figure 3a is a structural schematic diagram of a time synchronization device provided by an embodiment of the present invention;

[0055] Figure 3b It is a schematic diagram of the hardware structure of a photoelectric signal processing sub-device provided by one embodiment of the present invention;

[0056] Figure 3c is a functional structure diagram of a photoelectric signal processing sub-device provided by an embodiment of the present invention;

[0057] Figure 3d This is an optical waveform diagram without a time synchronization module provided by an embodiment of the present invention;

[0058] Figure 3e This is an optical waveform diagram under the control of a time synchronization module provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] In the field of signal transmission technology of industrial control systems, physical quantities such as temperature, pressure, flow, displacement, etc. can usually be converted into electrical signals for transmission. The transmission process can be divided into sensor transmission technology and communication transmission technology according to the type of electrical signal. In the field of communication transmission technology, industrial control systems use bus protocols such as Power Link (power connection) for data transmission. However, the protocol coding and time slot control mechanism in the bus communication method will cause a certain time delay in the communication process between different device terminals. Therefore, time information will be encoded in the protocol message of data transmission to mark the sending or receiving time of the current signal. Among them, the time information of each device terminal is usually obtained from the clock source through protocols such as NTP (Network Time Protocol) and PTP (Precision Time Protocol).

[0061] Different from communication transmission technology, sensor transmission technology can use "point-to-point" mode to transmit single-channel sensor signals, and the transmission signal type is analog signal, so there is no time delay in signal transmission, and there is no need for time synchronization between terminal devices. However, when it is necessary to transmit multiple sensor data on a single physical channel, it is also necessary to use time slot mode for transmission control (its essence is that the PLC (Programmable Logic Controller) controller polls and collects sensor data). Therefore, it is necessary to mark the time information for each sensor data to ensure the availability of subsequent sensor data analysis.

[0062] In practical applications, time synchronization methods in the field of communication transmission technology are relatively mature and common, but in the field of sensor transmission technology, there is no technical method using analog signals for time synchronization.

[0063] The technical problem to be solved by the present invention is to use a signal modulation technology to synchronize the time information to the sensor data of different device terminals through the transmission signal, so as to solve the problem that the sensor data output by the existing non-intelligent sensors does not have time information, and when the polling mechanism is used to collect and transmit the sensor data, the time when the sensor data is generated cannot be distinguished, thereby affecting the subsequent data analysis.

[0064] To achieve the above-mentioned purpose, a time synchronization method for transmitting weak current signals is provided in an embodiment of the present invention. The method is applied to a time synchronization device, and the sensor data is encoded according to a preset encoding rule to generate a coding sequence, and then the coding sequence is converted into an optical analog signal with time information, so as to realize data transmission in the form of a photoelectric analog signal, and then the optical fiber terminal device is combined to perform modulation to realize the association between the time information and the sensor data value, and the modulated optical analog signal is transmitted back to the photoelectric signal processing sub-device for analysis and calculation to obtain an analog current signal with time information, and thereby obtain the sensor data value with time information, so that the acquisition device carries the acquisition time of the sensor data while collecting the sensor data. Even if a patrol mechanism is used to collect and transmit data, the generation time of the sensor data can be distinguished. The sensor data value combined with the time information can realize effective analysis of the sensor data. At the same time, different sensor data values ​​can achieve time synchronization based on the same clock source.

[0065] On the other hand, the technical solution in the embodiment of the present invention can expand the application scenarios of the optical fiber terminal device. At the same time, through the soft upgrade time synchronization module, the relevant time synchronization function is realized, which has the technical characteristics of high reliability and easy upgrade.

[0066] Reference Figure 1a , showing a step flow chart of a time synchronization method for transmitting weak current signals provided by an embodiment of the present invention, which is applied to a time synchronization device, the time synchronization device includes an optoelectronic signal processing sub-device, an optical fiber terminal device and an optical fiber slip ring sub-device, and the optoelectronic signal processing sub-device may include a task management module, a time synchronization module and a light source control module.

[0067] The time synchronization method for transmitting a current signal using an optical analog signal based on the above-mentioned time synchronization device may specifically include the following steps:

[0068] Step S101, using the task management module to obtain time information released by a clock source in the time synchronization device, and sending the time information to the time synchronization module;

[0069] The time information may include the hour, minute, and second information of collecting the sensor data.

[0070] In practical applications, the task management module can be used to manage the time synchronization tasks in the embodiments of the present invention. Specifically, it can manage the opening or closing of the time synchronization tasks, set the number of parallel threads of the time synchronization tasks, set a single time polling cycle, etc.

[0071] In one embodiment of the present invention, the function of the task management module is to schedule global operation tasks, including control programs and operation variables. The task management module can send control instructions to the quality monitoring module and the signal processing module in the optoelectronic signal processing sub-device, and the control instructions are in the form of a sequence of 0 and 1 variables. Specifically, the task management module can turn on or off the quality monitoring of the optical analog signal transmission channel by sending control instructions to the quality monitoring module. The task management module can control the signal processing module to perform the corresponding optical analog signal analysis by sending control instructions to the signal processing module.

[0072] The task management module can also send a start instruction (i.e., an instruction of a sequence of 0 and 1 variables) to the light source control module, so that the light source control module can drive the light source to generate a laser with a constant optical power intensity, and the light waveform is a rectangular wave. The task management module in the time synchronization device can receive current time information from an external clock source, and the current time information is the time when the sensor data is generated.

[0073] In one embodiment of the present invention, after the task management module collects time information, the optoelectronic signal processing sub-device in the time synchronization device can be calibrated. After the calibration is successful, the task management module can synchronously send the time information to the time synchronization module, and then execute step S102.

[0074] The self-calibration of the optoelectronic signal processing sub-device means that the optoelectronic signal processing sub-device can automatically detect and adjust its internal parameters to ensure the accuracy and stability of its output signal.

[0075] The steps of self-calibration are as follows:

[0076] (1) Detection: The optoelectronic signal processing sub-device first detects its current output signal and compares it with a known reference signal. This reference signal can be an internal standard signal source or a high-precision reference signal connected externally.

[0077] (2) Analysis: The device analyzes the difference between the detected signal and the reference signal to determine whether there is a deviation and the magnitude of the deviation.

[0078] (3) Adjustment: Based on the analysis results, the device automatically adjusts its internal parameters, such as amplification factor, filter setting, gain, etc., to correct the deviation of the output signal.

[0079] (4) Verification: After adjustment, the device detects the output signal again and compares it with the reference signal to verify the effect of the calibration. If the calibration is successful, the output signal will be closer to the reference signal; if there is still a deviation, the device may make further adjustments.

[0080] (5) Records: The process and results of self-calibration are usually recorded to facilitate subsequent analysis and maintenance.

[0081] In the embodiment of the present invention, the self-calibration of the photoelectric signal processing sub-device can improve the accuracy, reduce the need for regular external calibration, and reduce the maintenance cost and time. At the same time, the reliability of the photoelectric signal processing sub-device is enhanced, and the photoelectric signal processing sub-device can be adapted to changes in different environments and maintain the stability of the output signal.

[0082] Specifically, the self-calibration of the optoelectronic signal processing sub-device may adopt any one or more of the following technical means:

[0083] Built-in reference source, digital signal processing, automatic control algorithm, sensor feedback.

[0084] Among them, the built-in reference source is a high-precision reference signal source integrated inside the optoelectronic signal processing sub-device for comparison with the output signal. Digital signal processing is the use of digital signal processing (DSP) technology to analyze and adjust the signal. Automatic control algorithm is the application of automatic control algorithm to achieve automatic adjustment of parameters. Sensor feedback is the use of sensor feedback to monitor environmental conditions and device status for corresponding calibration.

[0085] Step S102, after the time synchronization module receives the time information, it encodes the time information according to a preset encoding rule to obtain a coding sequence, and sends the coding sequence to the light source control module;

[0086] The preset coding rules may be set according to actual scenarios, and are not restricted in the embodiments of the present invention. The coding rules only need to satisfy the requirement of converting time information into a coding sequence processable by the light source control module.

[0087] Step S103, converting the coding sequence into an optical analog signal with time information through the light source control module, and sending the optical analog signal to the optical fiber slip ring sub-device, and then using the optical fiber slip ring sub-device to transmit the optical analog signal to the optical fiber terminal device in a polling manner;

[0088] The light source control system will receive the coding sequence and generate an optical analog signal according to the coding sequence, and the optical analog signal contains time information. Then the optical analog signal is sent to the optical fiber slip ring sub-device, and then the optical fiber slip ring sub-device is used to poll and transmit the optical analog signal to the optical fiber terminal device.

[0089] For example, when the coding sequence is a variable sequence composed of 1 and 0, assuming that in the variable sequence, if it is 1, a high-level signal is generated (indicating that the current is turned on), and if it is 0, a low-level signal is generated (indicating that the current is turned off).

[0090] Therefore, the current control signal corresponding to the variable sequence 1010 is (high level signal, low level signal, high level signal, low level signal), and then the optical analog signal is obtained based on the current control signal.

[0091] Specifically, in response to a first operation instruction for starting time synchronization, the light source control module can be controlled to drive a preset light source to generate an optical analog signal according to an encoded sequence, wherein the signal waveform of the optical analog signal is a rectangular wave, and the first half information of the rectangular wave is time information.

[0092] Among them, the first operation instruction is used to start time synchronization. The optoelectronic signal processing sub-device also includes a light source, and the light source control module can control the light source to turn on or off to control the generation of optical analog signals or stop generating optical analog signals.

[0093] When the task management module detects the first operation instruction, the light source control module can be controlled to convert the coded signal into a current control signal, and the light source control module can drive the preset light source to turn on, and then input the current control signal into the preset light source, and then output the corresponding light simulation signal according to the current control signal. After the preset light source is started, a light simulation signal with a rectangular wave waveform can be generated, the first half of which is time information, and the rectangular wave is a laser with a constant light power intensity.

[0094] In another embodiment of the present invention, the light source control module can be controlled to turn off the preset light source in response to the second operation instruction for turning off time synchronization. The light source can be turned off or on by user operation, so that the transmission synchronization process of the time information can be freely controlled.

[0095] In one embodiment of the present invention, after the optical fiber slip ring sub-device detects the rising edge of the rectangular wave to trigger reset, the optical analog signal is sequentially transmitted to the optical fiber terminal device for signal modulation through multiple physical channels.

[0096] The opening time of each channel is Δt. During the Δt time when any channel is opened, continuous laser pulses and normal light waveforms carrying time information will be received accordingly.

[0097] In the embodiment of the present invention, by introducing a rectangular wave rising edge trigger mechanism, a single optical analog signal can be used to poll and transmit multiple channels of sensor data and time information, so as to improve data processing efficiency.

[0098] Step S104: modulate the optical analog signal by the analog current signal in the optical fiber terminal device, and transmit the modulated optical analog signal back to the optoelectronic signal processing sub-device.

[0099] After the optical fiber terminal device obtains the optical analog signal, the optical fiber terminal device can modulate the optical analog signal through the analog current signal. The analog current signal is the output signal from the sensor in the industrial control system, and its value is associated with the sensor data value. The analog current signal can be modulated by the optical analog signal received by the optical fiber terminal device, and the modulated optical analog signal carries the original value of the current (i.e., the sensor data). The modulated optical analog signal can then be transmitted back to the optoelectronic signal processing sub-device for signal analysis in the optoelectronic signal processing sub-device.

[0100] The sensor data may include, but are not limited to, temperature data, pressure data, flow data, and displacement data collected by sensor devices, such as temperature data collected by a temperature sensor, pressure data collected by a pressure sensor, and the like.

[0101] Step S105, the modulated optical analog signal is analyzed and calculated by the optoelectronic signal processing sub-device to obtain an analog current signal with time information, and a sensor data value with time information is obtained based on the analog current signal to synchronize the time of multiple sensor devices used to collect sensor data values.

[0102] In the optoelectronic signal processing sub-device, the modulated optical analog signal transmitted back by the optical fiber terminal device can be analyzed to obtain an analog current signal with time information. The analog current information can be further used to obtain the original sensor data, and then the sensor data value of the time information can be obtained by combining the time information and the original sensor data. Therefore, when there are multiple sensor devices for collecting sensor data values, the multiple sensor devices synchronize time with a unified clock source, so that the time of the multiple sensor devices for collecting sensor data values ​​can be synchronized.

[0103] In one embodiment of the present invention, the time synchronization device includes a photoelectric detector and a signal processing module. Furthermore, in the time synchronization device, the modulated optical analog signal can be photoelectrically converted by the photoelectric detector to obtain a current signal carrying time information, and the analog current signal is sent to the signal processing module; the analog current signal is analyzed based on the signal processing module to obtain a sensor data value with time information.

[0104] In the embodiment of the present invention, the photoelectric detector realizes photoelectric conversion, and the signal processing module realizes the restoration of time information and sensor data. The combination of the two can parse the optical analog information carrying time information after the encoded transmission modulation, and obtain the sensor data associated with the time information, thereby realizing the association between the time information and the sensor data.

[0105] Among them, a photodetector is a device that converts optical signals into electrical signals. In the optoelectronic signal processing system, the role of the photodetector is to convert the received optical analog signal into an electrical analog signal for further processing and analysis.

[0106] Specifically, the photoelectric conversion process may include the following processes:

[0107] Receive optical signal: The photodetector receives the optical analog signal. This signal can be a continuous light wave or a modulated light pulse, depending on the application requirements of the system.

[0108] Photoelectric effect: When a light signal strikes the sensitive area of ​​a photodetector, a photoelectric effect occurs, in which photons interact with electrons in the detector material, causing the electrons to gain energy and transition to a conductive state.

[0109] Generate electrical signals: The photoelectric effect causes free electrons and / or holes to be generated in the detector material, and the movement of these charged particles forms an electric current. This current is proportional to the intensity of the received light signal.

[0110] Output electrical signal: The generated current is amplified and converted into a voltage signal. This voltage signal is the output of the photodetector. It is an electrical analog signal that reflects the characteristics of the original optical analog signal.

[0111] In one example, the types of photodetectors can be divided into photodiodes, photomultiplier tubes, photoconductive detectors, and phototransistors.

[0112] Among them, photodiodes can include PIN photodiodes, avalanche photodiodes (APDs), etc. Photodiodes use the photoelectric effect of semiconductor materials to convert light signals. Photomultiplier tubes can be used for high-sensitivity light detection, amplifying photocurrent through the electron multiplication process. Photoconductive detectors: such as cadmium sulfide (CdS) photoresistors, use the photoconductive effect of materials to detect light signals. Phototransistors: Combine the functions of photodiodes and transistors, and can directly amplify photocurrent.

[0113] In one embodiment of the present invention, the sensor data value with time information obtained through analysis can be sent to the task management module, which then sends it to the PLC controller or the host computer monitoring system.

[0114] In one embodiment of the present invention, the analog current signal is parsed based on the signal processing module to obtain the time information of the sensor data, including: converting the analog current signal into a coding sequence corresponding to a preset coding rule; and determining the time information of the sensor data according to the coding sequence.

[0115] In the embodiment of the present invention, the time information is transmitted in a coding sequence, and when the signal processing module parses the data, the coding rule can be applied to perform reverse parsing to obtain the parsed time information.

[0116] Reference Figure 1b , showing a data transmission schematic diagram in an embodiment of the present invention, one input signal of the optical fiber terminal device is the original current value (corresponding to the original sensing data), and the other input signal is an unmodulated optical analog signal, which is modulated by the current signal in the optical fiber terminal device to obtain a modulated optical analog signal, and the optical analog signal is input into the optoelectronic signal processing sub-device for demodulation and calculation, thereby obtaining the current measurement value of the original current signal.

[0117] In the embodiment of the present invention, by designing a time synchronization module, the time information in the time synchronization device can be encoded, and then an optical analog signal can be generated through the light source control module, and then the optical analog signal is modulated by an analog current signal corresponding to the original sensor data, so as to realize the transmission of time information by the optical analog signal. In addition, in the embodiment of the present invention, mechanisms such as rising edge triggering, time slot division, and extremely narrow continuous optical pulses can be designed to use a single optical analog signal to poll and transmit multiple sensor data and time information.

[0118] In an embodiment of the present invention, the synchronously collected time information can be encoded and converted into an optical analog signal, which is then modulated by an analog current signal generated based on the sensor data, thereby realizing the polling collection of the sensor data, marking the time information for each channel of sensor data, and distinguishing the time when the sensor data was generated to ensure that subsequent data analysis and mining work is not affected.

[0119] Reference Figure 2 , shows a flowchart of another method for time synchronization when a current signal is transmitted using an optical analog signal provided by an embodiment of the present invention, which may specifically include the following steps:

[0120] Step S201, using the task management module to obtain the time information released by the clock source in the time synchronization device, and synchronously sending the time information to the time synchronization module;

[0121] Step S202, after the time synchronization module receives the time information, the time information is encoded using a binary encoding rule to obtain a coding sequence, and the coding sequence is sent to the light source control module;

[0122] In one embodiment of the present invention, binary coding is used to encode time information to obtain a coding sequence, including: binary coding the hour information in the time information to obtain first coding information; binary coding the minute information in the time information to obtain second coding information; binary coding the second information in the time information to obtain third coding information; and combining the first coding information, the second coding information and the third coding information to generate a coding sequence.

[0123] Specifically, the hour information, minute information and second information can be converted from decimal to binary. The hour information, minute information and second information correspond to 6 bits respectively, and the length of the combined coding sequence is 18 bits.

[0124] In an embodiment of the present invention, by converting time information into a coding sequence with a preset code, so as to convert the time information into an optical analog signal carrying the time information through the coding sequence, a change in the data format is achieved, and then the time information can be transmitted through the optical analog signal. In the optical fiber terminal device, one path can input the unmodulated optical analog signal carrying the time information, and the other path can input the original value of the sensor data current (i.e., sensor data). By modulating the two, the association between the time information and the sensor data is achieved, so that time data can be added to the sensor data.

[0125] Step S203, converting the coding sequence into an optical analog signal with time information through the light source control module, and sending the optical analog signal to the optical fiber slip ring sub-device, and then transmitting it to the optical fiber terminal device through the optical fiber slip ring sub-device polling;

[0126] Step S204, modulating the optical analog signal carrying time information by the analog current signal in the optical fiber terminal device, and transmitting the modulated optical analog signal back to the optoelectronic signal processing sub-device;

[0127] Step S205, the modulated optical analog signal is analyzed and calculated by the optoelectronic signal processing sub-device to obtain an analog current signal with time information, and a sensor data value with the time information is obtained based on the analog current signal to synchronize the time of multiple sensor devices used to collect sensor data values.

[0128] In an embodiment of the present invention, the synchronously collected time information can be encoded and converted into an optical analog signal, which is then modulated by an analog current signal generated based on the sensor data, thereby realizing the polling collection of the sensor data, marking the time information for each channel of sensor data, and distinguishing the time when the sensor data was generated to ensure that subsequent data analysis and mining work is not affected.

[0129] It should be noted that, for the sake of simplicity, the method embodiments are described as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0130] Reference Figure 3a , shows a schematic diagram of the structure of a time synchronization device provided by an embodiment of the present invention, the time synchronization device includes an optoelectronic signal processing sub-device, an optical fiber terminal device and an optical fiber slip ring sub-device, the optoelectronic signal processing sub-device may include a task management module, a time synchronization module and a light source control module, wherein:

[0131] The task management module can be used for the time information released by the clock source in the time synchronization device, and synchronously sends the time information to the time synchronization module;

[0132] The time synchronization module can be used to encode the time information according to the preset encoding rules to obtain the encoding sequence, and send the encoding sequence to the light source control module;

[0133] The light source control module can be used to convert the coding sequence into an optical analog signal with time information, and send the optical analog signal to the optical fiber slip ring sub-device;

[0134] The optical fiber terminal device can be used to modulate the optical analog signal through the analog current signal, and the modulated optical analog signal is transmitted back to the optoelectronic signal processing sub-device;

[0135] The optical fiber slip ring sub-device can be used to transmit the optical analog signal polling to the optical fiber terminal device.

[0136] In an embodiment of the present invention, the time synchronization module may be used to encode the time information using a binary encoding rule to obtain a coding sequence.

[0137] In one embodiment of the present invention, the time synchronization module can be used to encode time information using binary coding rules to obtain a coding sequence, and is specifically used to: binary encode the hour information in the time information to obtain first coding information, binary encode the minute information in the time information to obtain second coding information, binary encode the second information in the time information to obtain third coding information, and combine the first coding information, the second coding information and the third coding information to generate a coding sequence.

[0138] In one embodiment of the present invention, the light source control module may be used to respond to a first operation instruction for starting time synchronization, control the light source control module to drive a preset light source to generate a light simulation signal according to the coding sequence, wherein the signal waveform of the light simulation signal is a rectangular wave, and the first half information of the rectangular wave is time information;

[0139] The optical fiber slip ring sub-device is used to detect the rising edge of the rectangular wave and trigger reset, and then transmit the optical analog signal to the optical fiber terminal device for signal modulation through multiple physical channels in sequence;

[0140] The optical fiber terminal device is used to modulate the current control signal into an optical analog signal.

[0141] In one embodiment of the present invention, the optical fiber slip ring sub-device can be used to receive continuous laser pulses and optical waveforms corresponding to time information within a preset time when multiple physical channels are opened.

[0142] In an embodiment of the present invention, the light source control module may be used to respond to a second operation instruction for shutting down time synchronization and shut down a preset light source.

[0143] In an embodiment of the present invention, the task management module may be used to calibrate the optoelectronic signal processing sub-device, and after the calibration is successful, the time information is encoded according to a preset encoding rule.

[0144] In one embodiment of the present invention, the time synchronization device includes a photodetector and a signal processing module;

[0145] The photodetector can be used to perform photoelectric conversion on the modulated optical analog signal to obtain an analog current signal carrying time information, and send the analog current signal carrying the time information to the signal processing module;

[0146] The signal processing module can be used to analyze the analog current signal carrying the time information to obtain the sensing data value with the time information.

[0147] In one embodiment of the present invention, the signal processing module is used to parse the analog current signal carrying the time information to obtain the time information of the sensor data, and is specifically used to convert the analog current signal carrying the time information into a coding sequence corresponding to a preset coding rule, and determine the sensor data value with time information according to the coding sequence.

[0148] Reference Figure 3b, shows a schematic diagram of the hardware structure of a photoelectric signal processing sub-device provided by an embodiment of the present invention. At the hardware structure level, the photoelectric signal processing sub-device includes hardware modules such as a PCB mainboard (Printed Circuit Board), a DSP (Digital Signal Processor) chip, memory, storage, a light source control circuit, a network card, a light source, and a photoelectric detector.

[0149] Among them, the light source control circuit is an analog circuit, whose input is a sequence of 0 and 1, and outputs an analog electrical signal to directly drive and control the intensity of the light source.

[0150] In practical applications, a fiber slip ring sub-device is deployed near the field-side fiber terminal device to control the light switching on the physical channels corresponding to different fiber terminal devices (such as Figure 3c , Figure 3b ).

[0151] Reference Figure 3c , showing a schematic diagram of the functional structure of a photoelectric signal processing sub-device provided by an embodiment of the present invention. At the functional level, the photoelectric signal processing sub-device includes a time synchronization module, a light source control module, a task management module, a signal processing module, and optical devices such as light sources and photodetectors.

[0152] Among them, the task management module, quality monitoring module and signal processing module are soft modules, running on the minimum operating system composed of hardware modules on the PCB board; the light source control module is the light source control circuit.

[0153] The function of the task management module is to schedule global operation tasks, including control programs and operation variables. It can send control instructions to the quality monitoring module and signal processing module. The instruction format is also a sequence of 0 and 1 variables. It can also directly control the light source control module to drive and adjust the start and stop and intensity of the light source.

[0154] The time synchronization function is to receive the time information sent by the task scheduling module and encode it into a variable sequence of 0 and 1, driving the light source control module to generate an optical analog signal of a certain power intensity (a laser pulse with an extremely short time period). The optical analog signal is a rectangular wave that contains the encoded time information.

[0155] The function of the signal processing module is to input the modulated optical analog signal (modulated by the analog current signal corresponding to the original sensing data) into the photodetector, output the target current information, perform high-speed sampling on the target current information, and process the sampled 0, 1 variable sequence, so as to obtain the sensing data carrying time information.

[0156] In the embodiment of the present invention, based on the reference Figure 3cThe specific method of implementing time synchronization in the structure may include the following steps:

[0157] The task management module sends a start instruction to the light source control module at time t0. The light source control module drives the light source to generate a laser with a constant light power intensity. The light waveform is a rectangular wave. The duration of a single time polling cycle is t0-t6.

[0158] The task management module receives the current time information from the external clock source, performs self-calibration on the optoelectronic signal processing sub-device, and synchronously sends the time information to the time synchronization module. The task management module sends the time information to the time synchronization module once every Δt.

[0159] The time synchronization module encodes the received time information by converting the "time information" (such as **hours, **minutes, **seconds) into a variable sequence of 0 and 1 (such as 110000, 110011, 011111), and the variable sequence length is 18 bits.

[0160] The time synchronization module sends the variable sequence to the light source control module.

[0161] The light source control module can convert the received variable sequence into a current control signal through the internal module circuit, input the driving power supply, and drive the light source to generate continuous extremely narrow pulses with a pulse duration period of t0-t1, that is, output light simulation signals.

[0162] After receiving the rising edge of the rectangular wave (i.e., the optical analog signal), the optical slip ring triggers reset (initial position), switches five physical channels in sequence starting from channel 1, and each channel is opened for a time of Δt, and transmits the optical analog signal to the optical terminal device through multiple physical channels in a polling manner.

[0163] The optical fiber terminal device can realize that within the Δt time when any channel is opened, it will receive continuous laser pulses and normal optical waveforms carrying time information accordingly (as shown in 3d, which is the optical waveform diagram when there is no time synchronization module, as shown in Figure 3e The figure shows an optical waveform diagram under the control of a time synchronization module), and the optical fiber terminal device can receive an analog current signal corresponding to the sensing data. The model current signal is an output signal from a sensor in an industrial control system. Then, the optical fiber terminal device can use the analog current signal to modulate the optical analog signal. The modulated optical analog signal can carry the original current value (i.e., the sensing data).

[0164] The optical fiber terminal device can transmit the modulated optical analog signal back to the optoelectronic signal processing sub-device. Specifically, the optical fiber terminal device can achieve feedback through the optical fiber slip ring sub-device. After receiving the modulated optical analog signal reflected back by the optical fiber terminal device, the optical fiber slip ring sub-device transmits the optical analog signal to the photoelectric detector in the optoelectronic signal processing sub-device through an open physical channel.

[0165] After receiving the modulated optical analog signal, the photoelectric detector performs photoelectric conversion to obtain an analog current signal carrying time information, and the current signal can be sent to the signal processing module.

[0166] After receiving the analog current signal, the signal processing module performs high-speed sampling, analyzes and calculates the time information and original sensor data value of the sensor data, and can send the time information and original transmission data value to the task management module, which sends it to the PLC controller or the host computer monitoring system.

[0167] In an embodiment of the present invention, the synchronously collected time information can be encoded and converted into an optical analog signal, which is then modulated using an analog current signal generated based on the sensor data, thereby realizing polling collection of the sensor data and marking time information for each channel of sensor data to distinguish the time when the sensor data was generated, thereby ensuring that subsequent data analysis and mining work is not affected.

[0168] An embodiment of the present invention further provides an electronic device, which may include a processor, a memory, and a computer program stored in the memory and capable of running on the processor. When the computer program is executed by the processor, the time synchronization method for transmitting current signals as described above is implemented.

[0169] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the time synchronization method for transmitting a current signal as described above is implemented.

[0170] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0171] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0172] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0173] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, 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, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate a device for implementing the functions specified in one process or multiple processes in the flowchart and / or one box or multiple boxes in the block diagram.

[0174] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0175] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce computer-implemented processing, so that the instructions executed on the computer or other programmable terminal device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0176] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0177] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0178] The time synchronization method, device, equipment and medium for transmitting weak current signals provided above are introduced in detail. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A time synchronization method for transmitting weak current signals, characterized in that: Applied to a time synchronization device, the time synchronization device includes an optoelectronic signal processing sub-device, an optical fiber terminal device, and an optical fiber slip ring sub-device, the optoelectronic signal processing sub-device includes a task management module, a time synchronization module, and a light source control module, the method includes: The task management module is used to obtain the time information released by the clock source in the time synchronization device, and the time information is synchronously sent to the time synchronization module; After the time synchronization module receives the time information, the time information is encoded according to a preset encoding rule to obtain an encoding sequence, and the encoding sequence is sent to the light source control module; The light source control module converts the coding sequence into an optical analog signal with the time information, and after the optical analog signal is sent to the optical fiber slip ring sub-device, the optical fiber slip ring sub-device is used to transmit the optical analog signal to the optical fiber terminal device in a polling manner; Modulating the optical analog signal by an analog current signal in the optical fiber terminal device, and transmitting the modulated optical analog signal back to the optoelectronic signal processing sub-device; The modulated optical analog signal is analyzed and calculated by the photoelectric signal processing sub-device to obtain an analog current signal with the time information, and a sensor data value with the time information is obtained based on the analog current signal, so as to synchronize the time of multiple sensor devices used to collect sensor data values.

2. The method according to claim 1, characterized in that The step of converting the coding sequence into an optical analog signal with the time information by the light source control module comprises: In response to a first operation instruction for starting time synchronization, the light source control module is controlled to drive a preset light source to generate a light simulation signal according to the coding sequence, wherein the signal waveform of the light simulation signal is a rectangular wave, and the first half information of the rectangular wave is time information.

3. The method according to claim 2, characterized in that The method of using the optical fiber slip ring sub-device to transmit the optical analog signal to the optical fiber terminal device in a polling manner includes: After the optical fiber slip ring sub-device detects the rising edge of the rectangular wave to trigger a reset, the optical analog signal is sequentially transmitted to the optical fiber terminal device for signal modulation through multiple physical channels.

4. The method according to claim 3, characterized in that Also includes: During the preset time when the multiple physical channels are opened, the optical fiber terminal device is used to receive continuous laser pulses and optical waveforms corresponding to the time information.

5. The method according to claim 2, characterized in that: Also includes: In response to a second operation instruction for shutting down time synchronization, the light source control module is controlled to shut down the preset light source.

6. The method according to claim 1, characterized in that The step of encoding the time information according to a preset encoding rule to obtain an encoding sequence includes: The time information is encoded using a binary encoding rule to obtain a coding sequence.

7. The method according to claim 6, characterized in that The time information is encoded by using binary coding to obtain a coding sequence, including: Binary-encode the time information in the time information to obtain first coded information; Binary-encode the sub-information in the time information to obtain second coded information; Binary-encode the second information in the time information to obtain third coded information; The first coding information, the second coding information and the third coding information are combined to generate a coding sequence.

8. The method according to claim 1, 6 or 7, characterized in that: The method further comprises: The time synchronization device is calibrated, and after the calibration is successful, the time information is encoded according to a preset encoding rule.

9. The method according to claim 1, characterized in that: The photoelectric signal processing sub-device includes a photoelectric detector and a signal processing module. The photoelectric signal processing sub-device performs analytical calculation on the modulated optical analog signal to obtain an analog current signal with the time information, and obtains a sensing data value with the time information based on the analog current signal, including: Performing photoelectric conversion on the modulated optical analog signal through the photodetector to obtain an analog current signal carrying the time information, and sending the analog current signal carrying the time information to a signal processing module; The analog current signal carrying the time information is analyzed based on the signal processing module to obtain a sensing data value carrying the time information.

10. The method according to claim 9, characterized in that The step of parsing the analog current signal carrying the time information based on the signal processing module to obtain the sensing data value carrying the time information includes: Converting the analog current signal into a coding sequence corresponding to a preset coding rule; The sensor data value with time information is determined according to the coding sequence.

11. A time synchronization device, characterized in that: The time synchronization device includes an optoelectronic signal processing sub-device, an optical fiber terminal device, and an optical fiber slip ring sub-device. The optoelectronic signal processing sub-device includes a task management module, a time synchronization module, and a light source control module, wherein: The task management module is used to obtain the time information released by the clock source in the time synchronization device, and synchronously send the time information to the time synchronization module; The time synchronization module is used to encode the time information according to a preset encoding rule to obtain a coding sequence, and send the coding sequence to the light source control module; The light source control module is used to convert the coding sequence into an optical analog signal with the time information, and send the optical analog signal to the optical fiber slip ring sub-device; The optical fiber slip ring sub-device is used to transmit the optical analog signal to the optical fiber terminal device in a polling manner; The optical fiber terminal device is used to modulate the optical analog signal through the analog current signal, and transmit the modulated optical analog signal back to the optoelectronic signal processing sub-device, so that the modulated optical analog signal can be analyzed and calculated by the optoelectronic signal processing sub-device to obtain an analog current signal with time information, and obtain a sensor data value with the time information based on the analog current signal, so as to synchronize the time of multiple sensor devices used to collect sensor data values.

12. The device according to claim 11, characterized in that The time synchronization module is used to encode the time information using a binary encoding rule to obtain a coding sequence.

13. The device according to claim 11, characterized in that The photoelectric signal processing sub-device includes a photoelectric detector and a signal processing module, wherein: The photodetector is used to perform photoelectric conversion on the modulated optical analog signal to obtain an analog current signal carrying time information, and send the analog current signal carrying the time information to the signal processing module; The signal processing module is used to analyze the analog current signal carrying the time information to obtain the sensing data value with the time information.

14. An electronic device, characterized in that: The method comprises a processor, a memory and a computer program stored in the memory and capable of running on the processor, wherein when the computer program is executed by the processor, the method for time synchronization of transmitting weak current signals as claimed in any one of claims 1 to 10 is implemented.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the time synchronization method for transmitting a weak current signal as claimed in any one of claims 1 to 10 is implemented.

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