High-synchronism distributed optical signal measurement system and method

Abstract

The invention discloses a high-synchronism distributed optical signal measurement system and method, and belongs to the field of optical signal measurement. The system comprises a detection system, a communication unit, an analysis system and a metal flat plate for receiving illumination, the detection system comprises a plurality of groups of detection modules and a plurality of groups of communication buses, each group of detection modules comprises a plurality of detection units which are mounted on the metal flat plate and are used for measuring optical signals at mounting positions, and each group of detection modules and the communication units carry out optical signal transmission through different communication buses; all the detection units in each group of detection modules are subjected to different delay processing; the communication unit uploads the received optical signals to the analysis system, and the analysis system stores and analyzes the received optical signals to obtain spatial and temporal distribution of the optical signals. According to the system, continuous synchronous sampling and data return under multi-point measurement are realized, the requirements of wide measurement range and continuous measurement of multiple sensors are considered, and spatial geometric distribution characteristics of a measured object are described more accurately.

Description

Technical Field

[0001] The present invention belongs to the field of optical signal measurement, and in particular relates to a highly synchronous distributed optical signal measurement system and method. Background Art

[0002] With the development of technology and the continuous expansion of measurement needs, the measurement field is moving towards large-capacity and multivariable measurement. Distributed measurement systems are widely used in various fields. In particular, in some scenarios, it is necessary to obtain the distribution of certain physical quantities in time and space, and distributed measurement systems and methods are needed to meet the needs.

[0003] The existing optical signal measurement system has problems in meeting the needs of continuous measurement of optical signals at multiple points. Specifically, the increase in measurement points will lead to an increase in the amount of data for each measurement. Storage on the sensor side will limit the number of sampling times due to memory space, and transmission back to the host computer will affect the frequency and synchronization of continuous measurement. Therefore, in order to meet the needs of signal measurement at multiple points, it is of great significance to develop a distributed measurement system that can achieve high-frequency continuous sampling. Summary of the invention

[0004] In order to solve the problems in the prior art, the present invention proposes a highly synchronous distributed optical signal measurement system and method.

[0005] The technical solution adopted by the present invention is as follows:

[0006] In the first aspect, the present invention discloses a highly synchronous distributed optical signal measurement system, comprising a metal plate, a detection system, a communication unit and an analysis system; the metal plate is used to receive light, the detection system comprises a plurality of detection modules and a plurality of communication buses, each detection module comprises a plurality of detection units installed on the metal plate, the detection units are used to measure the optical signals at the installation positions, each detection module is connected to an external power supply, and transmits optical signals to the communication units through different communication buses; each detection module has the same number of detection units, and all detection units in each detection module are subjected to different delay processing to avoid data congestion on the communication bus; each detection unit has a CAN transceiver module; the communication unit is used to upload the optical signal input through the communication bus to the analysis system, the analysis system stores and analyzes the received optical signal, and obtains the temporal and spatial distribution of each optical signal by analysis; the analysis system sends data measurement instructions to all CAN transceiver modules by broadcasting; wherein the communication bus is a dual CAN FD bus.

[0007] In a second aspect, the present invention discloses a highly synchronous distributed optical signal measurement method using the measurement system, comprising the following steps: when optical signal measurement is required, the analysis system broadcasts initialization instructions and data measurement instructions to the CAN transceiver modules of all detection units, the data measurement instructions including single data measurement instructions and continuous data measurement instructions, the detection units are initialized according to the received instructions and perform corresponding optical signal measurements according to the data measurement instructions; when the analysis system sends a single data measurement instruction, all detection units perform an optical signal measurement once, and then wait for the analysis system to broadcast a data transmission instruction, when the CAN transceiver module of the detection unit receives the data transmission instruction, the detection unit then inputs the optical signal to the communication unit through a communication bus, and the communication unit then uploads the received optical signal to the analysis system; the analysis system stores and analyzes the received optical signals, and obtains the temporal and spatial distribution of each optical signal by analysis; when the analysis system sends a continuous data measurement instruction, all detection units automatically input the optical signals to the communication unit through the communication bus after completing each optical signal measurement, and the communication unit then uploads the received optical signals to the analysis system; the analysis system stores and analyzes the received optical signals, and obtains the temporal and spatial distribution of each optical signal by analysis.

[0008] In summary, the present invention has the following beneficial technical effects:

[0009] The present invention solves the problem of slow data transmission affecting continuous measurement rate under multi-point measurement requirements by adopting a scheme of grouping communication for all detection units and performing different delay processing on the detection units in each group, and realizes that when the detection system is fully loaded (assuming that there are 256 detection units in the detection system), the system continuous sampling frequency can reach 100Hz without loss of measurement data, and the time synchronization accuracy of all detection units is below 10us. The present invention not only ensures the wide measurement range of multi-sensors, but also ensures the feasibility of continuous sampling and the time synchronization of multi-sensors.

[0010] The detection unit in the present invention, except that the communication module must be equipped with two CAN transceivers, can be designed and selected according to the hardware circuit and sensor configuration of the detection unit. Therefore, the present invention has good versatility, and different sensors can be installed to achieve a variety of detection requirements, such as light signals of different bands. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the composition of the highly synchronous distributed optical signal measurement system of the present invention;

[0012] Figure 2 A circuit schematic diagram of a CAN transceiver in a detection unit circuit in one embodiment of the present invention;

[0013] Figure 3 This is a schematic diagram of the functional modules of the analysis system of the present invention;

[0014] Figure 4 This is a schematic diagram of data visualization processing in one embodiment of the present invention. DETAILED DESCRIPTION

[0015] The present invention is further described and illustrated below in conjunction with specific embodiments. The embodiments are merely exemplary of the present disclosure and do not define the scope of limitation. The technical features of each embodiment of the present invention may be combined accordingly without conflicting with each other.

[0016] First, the present invention proposes a highly synchronous distributed optical signal measurement system. The whole system is mainly composed of a metal plate, a detection system, a communication unit and an analysis system. Among them, the metal plate is mainly used to receive light, and the metal plate can be an aluminum structural plate.

[0017] The detection system is composed of multiple detection units and multiple communication buses installed on a metal plate. When it comes to the need for optical signal measurement, the detection unit will measure the optical signal at the installation position, and the optical signal can be measured whether there is light at this time, but the result obtained when there is no light is 0. The detection unit is equipped with a communication module, a sensor for measuring optical signals, and a control module; the communication module mainly includes two CAN transceiver modules for connecting to the communication bus, one of which is a main communication module and the other is a backup communication module; the optical signal includes the intensity, power and incident energy of the incident light, and the control module is used to restore the optical signal amplified or biased by the sensor during the measurement, so that the intensity, power and incident energy of the restored optical signal are equal to the actual intensity, power and incident energy of the incident light; and the sensor is controlled to measure and transmit data based on the instructions received by the CAN transceiver module. The sensor and control module on the detection unit can be customized by the user, that is, they are selected according to the measurement requirements and measurement range.

[0018] The communication bus selects a dual CAN FD (CAN with Flexible Data rate, variable rate CAN) bus as the connection bus between each detection unit and the communication unit, and selects Ethernet and CAN bus data conversion equipment as the communication unit to support the communication between the detection unit and the analysis system. In the present invention, in order to ensure the communication rate and reliability, all detection units are divided into multiple groups as evenly as possible, each group is connected to a different communication bus, and each group is connected to a different CAN bus interface on the Ethernet and CAN bus data conversion equipment, and the detection units in each group are subjected to different delay processing according to the preset ID number to avoid bus congestion, and parallel data transmission can be realized between the dual CAN FD buses in different groups to meet the requirements of sampling (measurement) time synchronization and continuous sampling frequency. The analysis system runs on the host computer, and issues work instructions to the detection system by broadcasting (mainly sent to the CAN transceiver module). The analysis system receives the optical signals transmitted back by all detection units in the detection system through the communication bus and the communication unit and performs analysis and processing, and finally obtains the spatiotemporal distribution of each optical signal after processing; at the same time, the analysis system will store the optical signals it receives. The analysis system can realize the functions of real-time display, storage, and playback of data (optical signals).

[0019] Therefore, in one specific embodiment, the highly synchronous distributed optical signal measurement system of the present invention comprises a metal plate for receiving light, a detection system, a communication unit and an analysis system;

[0020] The detection system includes multiple groups of detection modules and multiple groups of communication buses. Each group of detection modules includes multiple detection units installed on a metal plate. The detection units are used to measure optical signals at the installation position. Each group of detection modules is connected to an external power supply, and the power supply is used to provide electrical energy for the sensor; and optical signals are transmitted to the communication units through different communication buses; each group of detection modules has the same number of detection units, and all detection units in each group of detection modules are subjected to different delay processing to avoid data congestion on the communication bus; each detection unit has a CAN transceiver module; the communication unit is used to upload the optical signal input through the communication bus to the analysis system, and the analysis system stores and analyzes the received optical signals to obtain the temporal and spatial distribution of each optical signal; the analysis system sends data measurement instructions to all CAN transceiver modules by broadcasting; wherein the communication bus is a dual CAN FD bus.

[0021] In addition, to achieve the above object: the present invention also proposes a highly synchronous distributed optical signal measurement method for measuring the spatiotemporal distribution of the measured signal quantity (optical signal), the method comprising:

[0022] Multiple detection units are deployed at multiple positions (points) on the metal plate where measurement is required, and the multiple detection units are grouped and processed, so that all detection units are divided into groups as evenly as possible; all detection unit groups (detection modules) are connected to the communication unit using different dual CAN FD buses, and the communication unit is connected to the analysis system through a network cable; the analysis system issues a measurement instruction to command the detection system to perform a single measurement or continuous measurement; after a single measurement, all detection units wait to receive a data transmission instruction from the analysis system, and after receiving the data transmission instruction, transmit the optical signal to the analysis system; under continuous sampling, the detection unit automatically transmits the optical signal back to the analysis system after each measurement;

[0023] After receiving the data from all detection units, the analysis system processes and visualizes them, which can show the temporal and spatial distribution of the measured light signal on the metal plate, store the light signal obtained from each measurement, and support playback and further data processing.

[0024] In one embodiment of the present invention, Figure 1 As shown, the measurement system in the embodiment is composed of a detector array (i.e., a detection system, composed of detection units), a communication unit and analysis software (i.e., the above-mentioned analysis system); the detector array is a detection module, which is composed of multiple detection units arranged in the form of an array, and the detector array is arranged on an aluminum target plate rack, and the target plate rack is installed on a mounting base. The analysis software is installed on the host computer as an analysis system. This embodiment uses 256 detection units, and the detection units are divided into four groups, i.e., 64 detection units in each group. Each group uses a dual CAN FD bus, and the two buses are backed up by each other. The CAN FD buses in the four groups work simultaneously, and each group performs different delay processing according to the different ID numbers of each detection unit. In addition, the CAN FD bus supports broadcast group transmission, which can be used to implement timing design and meet the time sampling synchronization requirements. CAN FD sets the intermediate carrier frame rate to 1Mbps and the data frame to 5Mbps. According to the data in this embodiment that each detection unit needs to transmit three optical signals and one energy signal, it can be calculated that under the 100Hz sampling working mode, the rate requirement of each CAN bus group is 1.9Mbps, and the CAN FD reference speed is 5Mbps. Considering that the length of some lines exceeds 1 meter, the speed is controlled at 3Mbsp, which can meet the use requirements. At the same time, the occupancy rate of each group is less than 50%.

[0025] exist Figure 1In the system shown, the entire system has 8 CAN FD communication buses, which are divided into 4 groups in the form of one main and one backup. All detection units in each group are connected in parallel on the bus. For each detection unit, there are two CAN FD communication interfaces (i.e., two CAN transceiver modules), one of which is used as the main communication interface, and the other is connected in parallel as a backup interface for system fault detection. When the system is working, four groups of CAN FD buses can work simultaneously.

[0026] In a specific embodiment of the present invention, the communication unit is an Ethernet and CAN bus data conversion device, and the communication unit transmits data with the analysis system through a network cable; wherein the number of detection module groups is 1 / 2 of the number of interfaces of the Ethernet and CAN bus data conversion device.

[0027] The CAN transceiver module of the communication module in the detection unit in this embodiment is as follows: Figure 2 As shown, the JA1462CAN transceiver from NXP is selected, which can be fully interconnected with the CAN FD bus, realize the CAN signal quality improvement function, greatly reduce the signal ringing effect in the network, and can perform reliable CAN FD communication at a speed of 5Mbit / s in a large topology. In addition, the TJA1462 has stricter bit timing symmetry performance and can also achieve CAN FD communication up to 8Mbit / s (MCU master support is required). The IO input allows direct connection to a 3.3V microcontroller. The device has low electromagnetic radiation (EME) and high electromagnetic interference (EMI). It meets the AEC-Q100 Grade 1 standard and is a high-reliability automotive-grade device. The power pin provides undervoltage detection, with an undervoltage detection threshold to the maximum voltage limit. When the power supply voltage drops below the shutdown mode threshold, the transceiver is disconnected from the bus, and the internal bias of the TXD and mode selection input pins can achieve defined fault operations.

[0028] The operating system of the analysis software in this embodiment is WIN7 or WIN10. The analysis software adopts a modular design and mainly includes three modules: system self-check module, measurement module and data management module. Figure 3 shown.

[0029] The main functions of the system self-test module include: sending broadcast self-test instructions to all detection units and communication units to confirm that each unit returns normal instructions; and issuing CAN bus inspection tests to the communication units, and the communication units check all CAN bus loops one by one. After completion, the communication units return normal test information.

[0030] The measurement module mainly completes the reception of the optical signal input by the communication unit and obtains the power and energy of the received optical signal. When the power or energy of the optical signal exceeds the threshold, an abnormal alarm is issued.

[0031] The main functions of the data management module include: reading back the test unit data. When applying the data obtained by the detection unit, you can select the corresponding test record file to replay the test process. The playback interface is displayed in a graphical manner. You can also select a certain detection unit to display the changes of its various signals (such as power signals, etc.) during the entire measurement process. In addition, it also includes the detection report generation function, which can be output in Excel format for subsequent processing.

[0032] The implementation steps of the high-synchronization distributed universal measurement method in this embodiment are as follows:

[0033] 1) This embodiment uses 256 detection units. First, all detection units are connected to the communication bus, and the communication bus is connected to the Ethernet and CAN bus data conversion device. The conversion device selected by the present invention integrates 8 CAN (FD)-bus interfaces. In order to ensure the communication rate and reliability, the measurement system divides the total of 256 detection units into four groups for communication, that is, each group has 64 detection units, and each group uses dual CAN buses for mutual backup. Each time all detection unit data returns to the analysis software, the four groups of buses work simultaneously.

[0034] 2) After the measurement system is powered on, the analysis software sends out initialization instructions and sampling instructions (single sampling or continuous sampling), and the detection unit performs sampling with a synchronization of less than 10us. (In single sampling mode, the detection unit will wait for the analysis software's instructions. After the software sends the instruction to return the data, all detection units will transmit the data to the host computer; in continuous sampling mode, all detection units will automatically transmit the data to the host computer after each measurement to prevent the next measurement data from overwriting the previous data.)

[0035] 3) After the measurement system completes its work, any measurement data can be selected for viewing in the analysis software, and the original data message sent back by the detection unit can be processed to form a visual data distribution, such as Figure 4 The horizontal and vertical coordinates in the three-dimensional graph represent the specific positions of each detection unit in this embodiment. For example, the horizontal coordinate of the detection unit position is 1 and the vertical coordinate is 1, which means that the detection unit is located at the point of the first row and the first column; the vertical coordinate in the three-dimensional graph represents the size of the measurement on each detection unit. The larger the measured value, the higher the height of the column. The relationship between the measured sizes of each position is visualized through the bar graph, and different colors are used to distinguish the detection units in different areas.

[0036] As shown in this embodiment, the measurement system equipped with 256 detection units can achieve 100Hz continuous sampling and real-time data transmission, and after measuring the sampling time difference of different measurement units is less than 10 microseconds, there is no loss of measurement data, and the time synchronization of multi-point measurement is achieved. Compared with the measurement system of the prior art, the measurement system of the present invention can achieve high-frequency continuous sampling in the face of a surge in data volume caused by more measurement points, which not only ensures the wide measurement range of multiple sensors, but also ensures the reliability of continuous sampling. In addition, compared with the measurement system with fixed functions, the measurement system of the present invention can achieve switching between different measurement tasks by replacing the detection unit, and has good versatility and functional scalability.

[0037] The above-mentioned embodiments only express several implementation modes of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. For those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A highly synchronous distributed optical signal measurement system, characterized in that: It includes a metal plate, a detection system, a communication unit and an analysis system; The metal plate is used to receive light. The detection system includes multiple detection modules and multiple communication buses. Each detection module includes multiple detection units installed on the metal plate. The detection units are used to measure the light signals at the installation position. Each detection module is connected to an external power supply and transmits light signals to the communication units through different communication buses. Each detection module has the same number of detection units, and all detection units in each detection module are subjected to different delay processing to avoid data congestion on the communication bus. Each detection unit has a CAN transceiver module. The communication unit is used to upload the optical signal input through the communication bus to the analysis system, and the analysis system stores and analyzes the received optical signals to obtain the temporal and spatial distribution of each optical signal; the analysis system sends data measurement instructions to all CAN transceiver modules by broadcasting; wherein the communication bus is a dual CAN FD bus.

2. The highly synchronous distributed optical signal measurement system according to claim 1, characterized in that: Each of the detection units has two CAN transceiver modules, which are connected to the dual CAN FD bus. One of the CAN transceiver modules serves as a main communication module, and the other serves as a backup communication module.

3. The highly synchronous distributed optical signal measurement system according to claim 1, characterized in that: The detection unit also includes a sensor and a control module for measuring the optical signal; the optical signal includes the intensity, power and incident energy of the incident light, and the control module is used to restore the optical signal amplified or biased by the sensor during the measurement, so that the intensity, power and incident energy of the restored optical signal are equal to the actual intensity, power and incident energy of the incident light; and to control the sensor to perform data measurement and transmission based on the instructions received by the CAN transceiver module.

4. The highly synchronous distributed optical signal measurement system according to claim 1, characterized in that: All detection units in each group of detection modules are subjected to different delay processing according to preset ID numbers.

5. The highly synchronous distributed optical signal measurement system according to claim 1, characterized in that: The communication unit is an Ethernet and CAN bus data conversion device, and the communication unit transmits data with the analysis system through a network cable; wherein the number of detection module groups is 1 / 2 of the number of interfaces of the Ethernet and CAN bus data conversion device.

6. The highly synchronous distributed optical signal measurement system according to claim 1, characterized in that: The analysis system includes a system self-check module, a test module and a data management module; The system self-check module is used to broadcast a self-check instruction to the communication unit and all detection units, and confirm whether the communication unit and each detection unit return a normal instruction; and send a communication bus check test instruction to the communication unit, and the communication unit checks all the circuits of the communication bus one by one, and after completion, the communication unit returns information on whether the test is normal; The measurement module is used to receive the optical signal input by the communication unit and obtain the power and energy of the received optical signal. When the power or energy of the optical signal exceeds a threshold, an abnormal alarm is issued; the data management module is used to store and read the optical signal input by the communication unit.

7. The highly synchronous distributed optical signal measurement system according to claim 1, characterized in that: The data measurement instructions sent by the analysis system include single data measurement instructions and continuous data measurement instructions; When the analysis system sends a single data measurement instruction, all detection units wait for the analysis system to broadcast the data transmission instruction before uploading the optical signal; when the analysis system sends a continuous data measurement instruction, all detection units automatically upload the optical signal after completing each optical signal measurement.

8. A highly synchronous distributed optical signal measurement method using the measurement system of claim 1, characterized in that: The following steps are involved: When optical signal measurement is required, the analysis system broadcasts initialization instructions and data measurement instructions to the CAN transceiver modules of all detection units, wherein the data measurement instructions include single data measurement instructions and continuous data measurement instructions. The detection units are initialized according to the received instructions and perform corresponding optical signal measurements according to the data measurement instructions. When the analysis system sends a single data measurement instruction, all detection units measure the optical signal once, and then wait for the analysis system to broadcast the data transmission instruction. When the CAN transceiver module of the detection unit receives the data transmission instruction, the detection unit inputs the optical signal to the communication unit through the communication bus, and the communication unit then uploads the received optical signal to the analysis system. The analysis system stores and analyzes the received optical signals to obtain the temporal and spatial distribution of each optical signal; When the analysis system sends a data continuous measurement instruction, all detection units automatically input the optical signal to the communication unit through the communication bus after completing each optical signal measurement, and the communication unit then uploads the received optical signal to the analysis system; The analysis system stores and analyzes the received optical signals to obtain the temporal and spatial distribution of each optical signal.

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