Optical fiber passive equipment health management system

Abstract

The invention discloses an optical fiber passive equipment health management system, and relates to the technical field of conveyor safety monitoring, the optical fiber passive equipment health management system comprises an optical fiber passive control cabinet and a plurality of sensor groups connected with the optical fiber passive control cabinet, and different optical fiber passive sensors in the sensor groups are arranged at different monitoring positions of a conveyor; the optical fiber passive control cabinet is used for sending optical signals to the optical fiber passive sensors, and different optical fiber passive sensors absorb and return optical signals with different wavelengths according to gratings with different central wavelengths arranged in the sensors; and the optical fiber passive control cabinet determines the position of abnormal temperature or vibration of the conveyor according to the fluctuation of the optical signal returned by the optical fiber passive sensor, and performs different processing according to different abnormal conditions. A passive optical fiber passive sensor is adopted to monitor different monitoring positions of the conveyor, and early warning of monitoring position abnormity is achieved according to returned optical signal fluctuation. And the optical fiber passive sensor does not need additional power supply access, so that the anti-interference capability is strong, and the health monitoring of the system on the conveyor is further ensured.

Description

Technical Field

[0001] The present application relates to the technical field of conveyor safety monitoring, and in particular to a fiber optic passive equipment health management system. Background Art

[0002] Conveyors are mechanical devices that transport materials continuously or intermittently. They are widely used in industrial production, logistics, mining, food processing, and other fields. Their core function is to automate the movement of materials along a fixed path, replacing manual labor, improving efficiency, and reducing costs.

[0003] During conveyor operation, when the drive motor and reducer are overloaded or lubrication fails, frictional heat generated by bearings and gears causes a sudden temperature rise. This high temperature accelerates grease carbonization, insulation aging, and even short-circuit in the motor windings. Furthermore, prolonged operation causes wear in conveyor bearings and gears, and eccentricity in rollers and drums, which can lead to conveyor vibration. Chronic vibration can loosen bolts or cause fatigue cracks in the frame. Vibration acceleration trend analysis can provide early warning of structural failure risks. Therefore, temperature and vibration monitoring for underground conveyors is a key measure to ensure safe equipment operation, prevent accidents, and reduce maintenance costs.

[0004] Traditionally, vibration sensors are installed on conveyor motors, reducers, rollers, and idlers, along with temperature sensors in heat-prone locations. These sensors are used to monitor conveyor safety. If the temperature or vibration frequency exceeds preset limits, an emergency stop is manually initiated for maintenance, preventing accidents. Since sensors are often installed at the conveyor's drive, and existing drives increasingly utilize variable-frequency motors and permanent magnet motors, the sensors' resistance to interference is becoming increasingly critical. Traditionally, sensors using electrical signal connections are active sensors with poor anti-interference capabilities, which compromises their monitoring effectiveness. Summary of the Invention

[0005] In order to solve the above technical problems, this application proposes the following technical solutions: In a first aspect, an embodiment of the present application provides a fiber optic passive equipment health management system, comprising: a fiber optic passive control cabinet and a plurality of sensor groups connected to the fiber optic passive control cabinet, wherein different fiber optic passive sensors in the sensor groups are arranged at different monitoring positions of a conveyor; the fiber optic passive control cabinet is used to send optical signals to the fiber optic passive sensors, and different fiber optic passive sensors absorb and return optical signals of different wavelengths according to gratings with different central wavelengths arranged inside the sensors, and the fiber optic passive control cabinet determines the location of the conveyor temperature or vibration abnormality based on the fluctuation of the optical signal returned by the fiber optic passive sensor, and performs different processing according to different abnormal conditions at the abnormal location.

[0006] In one possible implementation, the fiber optic passive control cabinet includes a cabinet body, a controller arranged in the cabinet body, a temperature-vibration demodulator electrically connected to the controller, and a fiber optic distribution frame connected to the temperature-vibration demodulator; the temperature-vibration demodulator is used to provide optical signals and receive optical signals returned by different fiber optic passive sensors, and convert the returned optical signals into electrical signals and send them to the controller for analysis to determine whether the positions monitored by different fiber optic passive sensors are abnormal; the fiber optic distribution frame is used to fuse and distribute the cores of the optical fibers to realize the distribution of optical signals to the fiber optic passive sensors.

[0007] In one possible implementation, the temperature-vibration demodulator provides an optical signal and receives optical signals returned by different optical fiber passive sensors, converts the returned optical signals into electrical signals, and sends them to a controller for analysis to determine whether the locations monitored by the different optical fiber passive sensors are abnormal, including: Determining the central wavelength of the grating in each of the fiber passive sensors; When the wavelength of the optical signal returned by the first optical fiber passive sensor deviates from its own central wavelength, the first optical fiber passive sensor is positioned and the corresponding optical signal is converted into an electrical signal and sent to the controller, wherein the first optical fiber passive sensor is any optical fiber passive sensor; The controller analyzes the measurement data of the first optical fiber passive sensor and displays the data on the HMI human-machine interface.

[0008] In a possible implementation, the controller analyzes the measurement data of the first optical fiber passive sensor, including: The temperature-vibration demodulator transmits the wavelength value of the return optical signal of the first optical fiber passive sensor to the controller; The controller determines the type of the first optical fiber passive sensor, including: an optical fiber passive temperature sensor, an optical fiber passive vibration sensor, or an optical fiber passive temperature and vibration sensor; If the first optical fiber passive sensor is an optical fiber passive vibration sensor, the controller performs Fourier transform processing based on the wavelength value of the received optical signal to obtain the frequency domain of each optical fiber passive sensor, and obtains the vibration frequency and vibration acceleration of the monitoring position measured by the first optical fiber passive sensor through data conversion; If the first optical fiber passive sensor is an optical fiber passive temperature sensor, the controller determines a wavelength offset of the first optical fiber passive temperature and vibration sensor according to the wavelength value of the received optical signal, and determines a temperature value of the monitoring position measured by the first optical fiber passive sensor according to the wavelength offset; If the first optical fiber passive sensor is an optical fiber passive temperature and vibration sensor, the vibration frequency, vibration acceleration and temperature value of the monitoring position are determined simultaneously according to the above method.

[0009] In one possible implementation, the controller determines a wavelength offset of the first optical fiber passive temperature-vibration sensor according to a wavelength value of a received optical signal, and determines a temperature value of a monitoring position measured by the first optical fiber passive sensor according to the wavelength offset, including: The wavelength offset of the first optical fiber passive temperature vibration sensor is obtained according to the central wavelength of the first optical fiber passive sensor and the wavelength of the optical signal received by the controller. ; According to the Get temperature change ,in is the grating temperature variation coefficient of the first optical fiber passive sensor; Obtain the temperature value of the monitoring position measured by the first optical fiber passive sensor according to the temperature change and the initial temperature of the first optical fiber passive sensor ,in: is the initial temperature of the first optical fiber passive sensor at the center wavelength.

[0010] In a possible implementation, performing different processing according to different abnormal situations at the abnormal location includes: Set different warning values ​​and alarm values ​​according to the conveyor operation standards; If any of the frequency value, acceleration value, and temperature information measured by the first optical fiber passive sensor is greater than the warning value and exceeds the first preset time window, an on-site personnel investigation is performed; If any of the frequency value, acceleration value and temperature information measured by the first optical fiber passive sensor is greater than the alarm value and exceeds the second time window, it is transmitted to the conveyor main control system through a passive switch signal, and the conveyor main control system performs equipment shutdown processing.

[0011] In a possible implementation, a first optical splitter is provided between the temperature-vibration demodulator and the optical fiber distribution frame. The first optical splitter divides each optical signal output from the temperature-vibration demodulator into multiple parallel optical signals.

[0012] In one possible implementation, the sensor group includes a series sensor group and a parallel sensor group, wherein the multiple fiber optic passive sensors in the series sensor group are arranged in series, and the multiple fiber optic passive sensors in the parallel sensor group are arranged in parallel; the multiple sensor groups in the fiber optic passive equipment health management system are combined into multiple series sensor groups and / or multiple parallel sensor groups.

[0013] In a possible implementation, a fiber optic distribution box is provided for each sensor group, and a second optical splitter is provided in the fiber optic distribution box. The second optical splitter is used to split an optical signal connected to the fiber optic distribution box into multiple parallel optical signals.

[0014] In a possible implementation, the temperature-vibration demodulator controls the working state of the optical fiber passive sensor by configuring the optical signal types of different fiber cores in the optical fiber.

[0015] In this embodiment, passive fiber optic sensors are used to monitor different monitoring locations on the conveyor. Fluctuations in the returned optical signal provide early warning of abnormalities at these locations. These passive fiber optic sensors require no additional power and offer strong anti-interference capabilities, ensuring the system's ability to monitor the health of the conveyor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a passive optical fiber device health management system provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a fiber optic passive control cabinet provided in an embodiment of the present application; Figure 3 A schematic diagram of a fiber optic passive control cabinet with an independent controller provided in an embodiment of the present application; Figure 4 A schematic diagram of a process for determining an abnormal position of a conveyor provided in an embodiment of the present application; Figure 5 A schematic diagram of a process for determining the temperature of a conveyor monitoring position provided in an embodiment of the present application; Figure 6 A schematic diagram of a process for performing different processing based on monitoring information provided in an embodiment of the present application; Figure 1-6 In the symbol, it is represented as: 1-Fiber optic passive control cabinet, 2-Sensor group, 3-Fiber optic passive temperature and vibration sensor, 4-Fiber optic passive temperature sensor, 5-Fiber optic passive vibration sensor, 6-Controller, 7-Temperature and vibration demodulator, 8-Fiber optic distribution frame, 9-First optical splitter, 10-Fiber optic distribution box, 11-Second optical splitter. DETAILED DESCRIPTION

[0017] The present invention will be described below with reference to the accompanying drawings and specific implementation methods.

[0018] See also Figure 1The fiber-optic passive equipment health management system in this embodiment includes a fiber-optic passive control cabinet 1 and multiple sensor groups 2 connected to the fiber-optic passive control cabinet 1. The sensor groups 2 in this embodiment include a series sensor group 2 and a parallel sensor group 2. The multiple fiber-optic passive sensors in the series sensor group 2 are arranged in series, and the multiple fiber-optic passive sensors in the parallel sensor group 2 are arranged in parallel. The multiple sensor groups 2 in the fiber-optic passive equipment health management system are combined into multiple series sensor groups 2 and / or multiple parallel sensor groups 2. The types of fiber-optic passive sensors include: fiber-optic passive temperature sensors, fiber-optic passive vibration sensors, or fiber-optic passive temperature and vibration sensors. Fiber-optic passive temperature and vibration sensors, fiber-optic passive temperature sensors, and fiber-optic passive vibration sensors are used in equipment such as conveyor drives and rollers that require monitoring of operating temperature and vibration. In this embodiment, the different fiber-optic passive sensors in the sensor group 2 are arranged at different monitoring locations on the conveyor.

[0019] like Figure 1 In the embodiment, multiple fiber optic passive temperature and vibration sensors are installed on the conveyor 1. The sensor group 2 installed at one end of the conveyor 1 is composed of multiple fiber optic passive temperature and vibration sensors 3 arranged in parallel, and the sensor group 2 installed at the other end of the conveyor 1 is composed of multiple fiber optic passive temperature and vibration sensors 3 arranged in series. Multiple fiber optic passive temperature sensors 4 and fiber optic passive vibration sensors 5 are installed at both ends of the conveyor 2. The fiber optic passive temperature sensor 4 and fiber optic passive vibration sensor 5 installed at one end are arranged in parallel, and the fiber optic passive temperature sensor 4 and fiber optic passive vibration sensor 5 installed at the other end are arranged in series.

[0020] In this embodiment, the fiber-optic passive control cabinet 1 is used to send optical signals to the fiber-optic passive sensors. Specifically, the fiber-optic passive control cabinet 1 includes a cabinet body, a controller 6 disposed within the cabinet body, a temperature-vibration demodulator 7 electrically connected to the controller 6, and a fiber-optic distribution frame 8 connected to the temperature-vibration demodulator 7. The temperature-vibration demodulator 7 is used to provide optical signals and receive optical signals returned by different fiber-optic passive sensors. The returned optical signals are converted into electrical signals and sent to the controller 6 for analysis to determine whether the locations monitored by different fiber-optic passive sensors are abnormal. The fiber-optic distribution frame 8 is used to fusion-splice and distribute the cores of the optical fibers to achieve distribution of the optical signals to the fiber-optic passive sensors.

[0021] In this embodiment, the controller 6 adopts a PLC, which is connected to the human-machine interface touch screen HMI. Figure 2 The HMI in this embodiment can be replaced by a host PC, where the PC can realize the functions of display and data processing. Of course, the host PC can also be directly used to replace the PLC and HMI in this embodiment. In this case, the host PC can be opened independently of the optical fiber passive control cabinet 1 as a separate individual, such as Figure 3 shown.

[0022] Since the number of optical signals provided by the temperature vibration demodulator is limited, for example, an 8-channel temperature vibration demodulator can only provide 8 optical signals, and each channel can be connected to 1-4 fiber optic passive vibration sensors or 1-4 fiber optic passive temperature sensors. Therefore, when the system is equipped with more fiber optic passive sensors, this embodiment can be provided with a first optical splitter 9 between the temperature vibration demodulator and the fiber optic distribution frame. The first optical splitter 9 divides each optical signal output from the temperature vibration demodulator 7 into multiple parallel optical signals. Figure 1 In the embodiment, one optical signal output from the temperature-vibration demodulator 7 is divided into four parallel optical signals.

[0023] Furthermore, a fiber optic distribution box 10 is provided for each sensor group in the present application. The fiber optic distribution box 10 is provided with a second optical splitter 11. The second optical splitter 11 is used to split the optical signal received by the fiber optic distribution box 10 into multiple parallel optical signals. In this way, when the sensor group comprises multiple fiber optic passive sensors arranged in parallel, only the optical signal required to satisfy one of the fiber optic passive sensors needs to be provided. After entering the fiber optic distribution box, it is directly split into multiple parallel signals to meet the operating requirements of the multiple fiber optic passive sensors arranged in parallel.

[0024] It should be noted that the fiber-optic passive temperature sensor 4 and fiber-optic passive vibration sensor 5 connected in parallel require only one optical signal path, so only one second optical splitter 11 is required in the fiber-optic distribution box 10. For the fiber-optic passive temperature and vibration sensors connected in parallel, two optical signals are input to the sensors at a time, so two second optical splitters 11 are required in the fiber-optic distribution box 10.

[0025] like Figure 1 In the figure, the four fiber-optic passive temperature and vibration sensors 3 installed at the left end of conveyor 1 are arranged in parallel, and the corresponding fiber-optic distribution box 10 is equipped with two second optical splitters 11. Similarly, the four fiber-optic passive sensors installed at the left end of conveyor 2 are two fiber-optic passive vibration sensors 5 and two fiber-optic passive temperature sensors 4 installed in parallel. Because the two sensors require different types of optical signals, two second optical splitters 11 are also installed in the fiber-optic distribution box 10, respectively for splitting the two different types of light. However, if the four fiber-optic passive sensors installed at the left end of conveyor 2 are of the same type, a single second optical splitter 11 in the fiber-optic distribution box 10 is sufficient.

[0026] In this embodiment, the temperature vibration demodulator 7 can also be controlled to control the working state of the optical fiber passive sensor by configuring the optical signal type of different fiber cores in the optical fiber. For example, the type of optical fiber passive sensor installed on the conveyor 1 is an optical fiber passive temperature vibration sensor. If some of the passive optical fiber temperature vibration sensors are required to only measure temperature, then the two optical signals input to the passive optical fiber temperature vibration sensor are set in the temperature vibration demodulator to be both for the temperature sensor. At this time, although there are two optical signals input to the passive optical fiber temperature vibration sensor, the type of the optical signal is corresponding to the temperature sensor, so the vibration sensor therein cannot work. If it is set in the opposite way, only the vibration sensor works alone. When the passive optical fiber temperature vibration sensor is required to work normally, the temperature vibration demodulator can be controlled to adjust the type of the output optical signal.

[0027] In this embodiment, different optical fiber passive sensors absorb and return optical signals of different wavelengths according to gratings with different central wavelengths set inside the sensors. The optical fiber passive control cabinet determines the location of the abnormal temperature or vibration of the conveyor based on the fluctuations of the optical signals returned by the optical fiber passive sensors, and issues an early warning.

[0028] See also Figure 4 After receiving the electrical signal from the temperature-vibration interrogator, the controller determines the center wavelength of the grating within each of the passive fiber optic sensors. If the wavelength of the optical signal returned by a first passive fiber optic sensor deviates from its own center wavelength, the controller locates the first passive fiber optic sensor and converts the corresponding optical signal into an electrical signal, which is then transmitted to the controller. The controller analyzes the measurement data from the first passive fiber optic sensor and displays it on the HMI (human-machine interface).

[0029] The controller analyzes measurement data from the first passive optical fiber sensor, including: the temperature-vibration interrogator transmits the wavelength value of the return optical signal from the first passive optical fiber sensor to the controller. The controller determines the type of the first passive optical fiber sensor, including: a passive optical fiber temperature sensor, a passive optical fiber vibration sensor, or a passive optical fiber temperature-vibration sensor.

[0030] If the first fiber optic passive sensor is a fiber optic passive vibration sensor, the controller performs Fourier transform processing based on the wavelength of the received optical signal to obtain the frequency domain of each fiber optic passive sensor. Through data conversion, the controller obtains the vibration frequency and vibration acceleration of the monitoring location measured by the first fiber optic passive sensor. If the first fiber optic passive sensor is a fiber optic passive temperature sensor, the controller determines the wavelength offset of the first fiber optic passive temperature and vibration sensor based on the wavelength of the received optical signal, and determines the temperature of the monitoring location measured by the first fiber optic passive sensor based on the wavelength offset. If the first fiber optic passive sensor is a fiber optic passive temperature and vibration sensor, the controller simultaneously determines the vibration frequency, vibration acceleration, and temperature of the monitoring location using the aforementioned method.

[0031] See also Figure 5 The controller determines the wavelength offset of the first optical fiber passive temperature vibration sensor according to the wavelength value of the received optical signal, and determines the temperature value of the monitoring position measured by the first optical fiber passive sensor according to the wavelength offset, including: obtaining the wavelength offset of the first optical fiber passive temperature vibration sensor according to the center wavelength of the first optical fiber passive sensor and the wavelength of the optical signal received by the controller According to the Get temperature change ,in The temperature value of the monitoring position measured by the first optical fiber passive sensor is obtained based on the temperature change and the initial temperature of the first optical fiber passive sensor. ,in: is the initial temperature of the first optical fiber passive sensor at the center wavelength.

[0032] The operating frequency value, acceleration value and temperature information of the monitoring position are obtained based on the wavelength information of the optical signal returned by the first optical fiber passive sensor. Figure 6 , and make different treatments according to different abnormal situations at the abnormal location, including: setting different warning values ​​and alarm values ​​according to the conveyor operation standards; if any of the frequency value, acceleration value and temperature information measured by the first optical fiber passive sensor is greater than the warning value and exceeds the first preset time window, on-site personnel will conduct investigation and processing; if any of the frequency value, acceleration value and temperature information measured by the first optical fiber passive sensor is greater than the alarm value and exceeds the second time window, it will be transmitted to the conveyor main control system through the passive switch signal, and the conveyor main control system will perform equipment shutdown processing.

[0033] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0034] The above description is merely a specific embodiment of the present application. Any person skilled in the art may easily conceive of variations or substitutions within the technical scope disclosed in this application, and such variations or substitutions shall be within the scope of protection of this application. The scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

1. A fiber passive device health management system, characterized in that: include: A fiber optic passive control cabinet and a plurality of sensor groups connected to the fiber optic passive control cabinet, wherein different fiber optic passive sensors in the sensor group are arranged at different monitoring positions of the conveyor; The fiber optic passive control cabinet is used to send optical signals to the fiber optic passive sensors. Different fiber optic passive sensors absorb and return optical signals of different wavelengths according to gratings with different central wavelengths set inside the sensors. The fiber optic passive control cabinet determines the location of the conveyor temperature or vibration abnormality based on the fluctuations of the optical signals returned by the fiber optic passive sensors, and takes different measures according to different abnormal conditions at the abnormal location.

2. The optical fiber passive device health management system according to claim 1, characterized in that: The fiber optic passive control cabinet includes a cabinet body, a controller arranged in the cabinet body, a temperature-vibration demodulator electrically connected to the controller, and a fiber optic distribution frame connected to the temperature-vibration demodulator; the temperature-vibration demodulator is used to provide optical signals and receive optical signals returned by different fiber optic passive sensors, and convert the returned optical signals into electrical signals and send them to the controller for analysis to determine whether the positions monitored by different fiber optic passive sensors are abnormal; the fiber optic distribution frame is used to fuse and distribute the cores of the optical fibers to realize the distribution of optical signals to the fiber optic passive sensors.

3. The optical fiber passive device health management system according to claim 2, characterized in that: The temperature-vibration demodulator provides an optical signal and receives optical signals returned by different optical fiber passive sensors, converts the returned optical signals into electrical signals and sends them to the controller for analysis to determine whether the locations monitored by different optical fiber passive sensors are abnormal, including: Determining the central wavelength of the grating in each of the fiber passive sensors; When the wavelength of the optical signal returned by the first optical fiber passive sensor deviates from its own central wavelength, the first optical fiber passive sensor is positioned and the corresponding optical signal is converted into an electrical signal and sent to the controller, wherein the first optical fiber passive sensor is any optical fiber passive sensor; The controller analyzes the measurement data of the first optical fiber passive sensor and displays the data on the HMI human-machine interface.

4. The optical fiber passive device health management system according to claim 3, characterized in that: The controller analyzes the measurement data of the first optical fiber passive sensor, including: The temperature-vibration demodulator transmits the wavelength value of the return optical signal of the first optical fiber passive sensor to the controller; The controller determines the type of the first optical fiber passive sensor, including: an optical fiber passive temperature sensor, an optical fiber passive vibration sensor, or an optical fiber passive temperature and vibration sensor; If the first optical fiber passive sensor is an optical fiber passive vibration sensor, the controller performs Fourier transform processing based on the wavelength value of the received optical signal to obtain the frequency domain of each optical fiber passive sensor, and obtains the vibration frequency and vibration acceleration of the monitoring position measured by the first optical fiber passive sensor through data conversion; If the first optical fiber passive sensor is an optical fiber passive temperature sensor, the controller determines a wavelength offset of the first optical fiber passive temperature and vibration sensor according to the wavelength value of the received optical signal, and determines a temperature value of the monitoring position measured by the first optical fiber passive sensor according to the wavelength offset; If the first passive optical fiber sensor is a passive optical fiber temperature and vibration sensor, the vibration frequency, vibration acceleration and temperature value of the monitoring position are determined simultaneously according to the above method.

5. The optical fiber passive device health management system according to claim 4, characterized in that: The controller determines a wavelength offset of the first optical fiber passive temperature-vibration sensor according to a wavelength value of a received optical signal, and determines a temperature value of a monitoring position measured by the first optical fiber passive sensor according to the wavelength offset, including: The wavelength offset of the first optical fiber passive temperature vibration sensor is obtained according to the central wavelength of the first optical fiber passive sensor and the wavelength of the optical signal received by the controller. ; According to the Get temperature change ,in is the grating temperature variation coefficient of the first optical fiber passive sensor; Obtain the temperature value of the monitoring position measured by the first optical fiber passive sensor according to the temperature change and the initial temperature of the first optical fiber passive sensor ,in: is the initial temperature of the first optical fiber passive sensor at the center wavelength.

6. The optical fiber passive device health management system according to any one of claims 3 to 5, characterized in that: The different processing according to different abnormal situations of the abnormal location includes: Set different warning values ​​and alarm values ​​according to the conveyor operation standards; If any of the frequency value, acceleration value, and temperature information measured by the first optical fiber passive sensor is greater than the warning value and exceeds the first preset time window, an on-site personnel investigation is performed; If any of the frequency value, acceleration value and temperature information measured by the first optical fiber passive sensor is greater than the alarm value and exceeds the second time window, it is transmitted to the conveyor main control system through a passive switch signal, and the conveyor main control system performs equipment shutdown processing.

7. The optical fiber passive device health management system according to claim 2, characterized in that: A first optical splitter is provided between the temperature-vibration demodulator and the optical fiber distribution frame. The first optical splitter divides each optical signal output from the temperature-vibration demodulator into multiple parallel optical signals.

8. The optical fiber passive device health management system according to claim 7, characterized in that: The sensor group includes a series sensor group and a parallel sensor group. The multiple fiber optic passive sensors in the series sensor group are arranged in series, and the multiple fiber optic passive sensors in the parallel sensor group are arranged in parallel. The multiple sensor groups in the fiber optic passive equipment health management system are combined into multiple series sensor groups and / or multiple parallel sensor groups.

9. The optical fiber passive device health management system according to claim 8, characterized in that: An optical fiber distribution box is provided corresponding to each sensor group. A second optical splitter is provided in the optical fiber distribution box. The second optical splitter is used to divide one optical signal connected to the optical fiber distribution box into multiple parallel optical signals.

10. The optical fiber passive device health management system according to claim 2, characterized in that: The temperature-vibration demodulator controls the working state of the optical fiber passive sensor by configuring the optical signal types of different fiber cores in the optical fiber.

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