Portable multi-path intelligent optical fiber calibration detection device

Abstract

The invention, which belongs to the technical field of optical fiber communication, discloses a portable multi-channel intelligent optical fiber cable checking detection device comprising a host control unit and a slave control unit, and the host control unit is connected with the slave control unit through wireless communication. The host control unit is connected with a host power supply unit, a fault positioning unit, a host display unit, a light source detection unit, a red light source unit and a to-be-detected line interface unit; and the slave control unit is connected with a slave power supply unit, a slave display unit and a light source emission unit. The problems that at present, a telephone or an interphone is adopted for communication, certain working hours are occupied, results cannot be visually displayed, simultaneous development of multiple groups is inconvenient, and the communication efficiency is low are solved. The problem that in a traditional mode, a fault reason is searched by manually combining an optical power test result and working experience, and long working time is occupied is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to a portable multi-channel intelligent optical fiber calibration detection device. Background Art

[0002] With the continuous advancement of fiber optic communication technology, it has become an indispensable and important part of modern communication networks. With the continuous development of fiber optic communication technology, the demand for testing and maintenance of optical fibers is also increasing. In the power and communication industries, optical fiber networks are widely used in data transmission, video surveillance, remote control and other fields. However, during the laying and use of optical fiber networks, they are often affected by factors such as environment, construction, and aging, resulting in problems such as decreased fiber connection quality and signal attenuation. In order to ensure the stability and reliability of optical fiber networks, optical fibers need to be regularly inspected and maintained. There are many optical fiber circuits involved in the relay protection and communication majors of smart substations. Traditional optical fiber testing equipment and methods can no longer meet the needs of efficient, accurate and rapid detection of modern optical fiber communication networks. The existing working mode uses a lighting pen to calibrate the optical fiber circuit and uses an optical power meter to test the optical fiber circuit. This method has the problems of long working hours, many steps, and inconvenience for multiple groups to carry out at the same time.

[0003] At present, the optical fiber calibration work mainly uses the optical fiber loop core splitting calibration with a light pen. After the calibration is completed, the optical cable core is connected to the protection device, the optical power is measured at the other end of the optical fiber, and the optical attenuation is calculated. The optical cable calibration and testing work is completed until the entire optical fiber loop test is completed and the optical power is qualified. If a defect in the optical fiber loop is found during the calibration or testing work, the defect elimination work is carried out and the subsequent work is carried out after the inspection is qualified.

[0004] Problems with the current way of working:

[0005] 1. Since there are a large number of optical cable cores and the calibration and optical power testing stages need to be performed separately, many steps are required and the process is complicated.

[0006] 2. The traditional method can only combine the optical power test results and work experience to find the cause of the fault manually, which takes a long time.

[0007] 3. Using telephones or intercoms for communication takes up a certain amount of working time, and the results cannot be displayed intuitively. It is not convenient for multiple groups to carry out work at the same time, and the communication efficiency is low. Summary of the invention

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a portable multi-channel intelligent optical fiber alignment detection device to solve the problems in the above-mentioned background technology.

[0009] The purpose of the present invention is achieved as follows: a portable multi-channel intelligent optical fiber calibration detection device, which includes a host control unit and a slave control unit, the host control unit is connected to the slave control unit through wireless communication; the host control unit is connected to a host power supply unit, a fault location unit, a host display unit, a light source detection unit, a red light source unit and a line interface unit to be tested; the slave control unit is connected to a slave power supply unit, a slave display unit and a light source emission unit. The 6 optical fibers at one end of the optical cable are simultaneously connected to the 6 optical ports of the host, and the 6 optical fibers at the other end are simultaneously connected to the 6 optical ports of the slave. The slave presses a button to send a step-by-step increasing optical power. The host simultaneously measures the current optical power and records the result, and then performs a logical operation, displays the corresponding relationship between the two ends on the host screen, and obtains the calibration result. Solve the problem that the number of optical cable cores is large and the calibration link and optical power test link need to be performed separately, with many steps and complicated processes.

[0010] Fault location unit: The fault location unit uses an optical time domain reflectometer module, which is used for fault distance measurement and location of faulty optical fiber links. A dedicated optical fiber interface is set up. The optical fiber to be located needs to be manually connected to the dedicated interface for testing and directly connected to the controller to send the fault information to the processor in a timely manner. The test is carried out by emitting a light pulse into the optical fiber and then receiving the returned information at the port. When the light pulse is transmitted in the optical fiber, it will cause scattering and reflection due to the nature of the optical fiber itself, connectors, joints, bends or other events. Part of the scattering and reflection will be returned to the module. The returned useful information is measured by the detector, and they are used as time or curve fragments at different positions in the optical fiber. From the time taken for the transmitted signal to the returned signal, and then determining the speed of light in the material, the distance can be calculated. It solves the problem of manually combining the optical power test results and work experience in the traditional mode to find the cause of the fault, which takes up a long working time.

[0011] Host display unit and slave display unit: LCD screen is used to display data, which is divided into host display and slave display; the information displayed on the master and slave screens will directly affect the accuracy and speed of phase reading. The selected screen display unit must be able to intuitively display the fiber pairing status, optical power test results, and real-time optical reflection waveforms of fault location tests, and should have high interactivity and be easy to operate. Solve the current problem of using telephones or intercoms for communication, which takes up a certain amount of man-hours, cannot intuitively display results, is not convenient for multiple groups to carry out at the same time, and has low communication efficiency.

[0012] Furthermore, the host control unit is an AT32F421 series microcontroller, and the host control unit is used to control light source emission, light source detection and receiving key commands, coordinate peripheral work, collect measurement results and send the calculation results to the display module;

[0013] The fault location unit includes an optical time domain reflection module, and the optical time domain radiation module is used for fault distance measurement and location of a faulty optical fiber link;

[0014] The light source detection unit includes six groups of receivers;

[0015] The red light source unit is a semiconductor laser, and the emitted laser achieves population inversion, satisfies threshold conditions and resonance conditions, generates stimulated emission of light, and emits stable red light for optical fiber fault detection.

[0016] Furthermore, the host power supply unit and the slave power supply unit both use lithium batteries, and the capacity of the lithium batteries is not less than 1500mah; the host display unit and the slave display unit both use liquid crystal display screens to display data.

[0017] Furthermore, the system program of the host control unit includes a hardware system and a software system, and the software system includes a monitoring program for managing the normal operation of the entire system and a functional program for performing required tasks; the monitoring program is used to promptly respond to various service requests from within the system or instrument, manage the exchange of information between the measurement and control system's own software and hardware and other devices in the system, and take corresponding measures when a system failure occurs.

[0018] Furthermore, the control model of the software system is:

[0019]

[0020] In the formula, K p is the proportionality coefficient; T i is the integral coefficient; T d is the differential coefficient; e(t) is the error signal,

[0021] e(t)=r(t)-c(t), r(t) is the set value of the controlled quantity; c(t) is the actual output value of the controlled quantity; u(t) is the control signal quantity;

[0022] The set value r(t) is subtracted from the actual value c(t) of the controlled quantity of the controlled system to obtain the error e(t). The error e(t) is linearly combined after proportional, integral and differential operations to obtain the control input u(t) of the controlled system. The controller outputs the control to the controlled object, thus achieving the purpose of automatic control of the controlled system.

[0023] Furthermore, the host control unit includes connecting six optical fibers at one end of the optical cable to six optical ports of the host at the same time, and connecting six optical fibers at the other end to six optical ports of the slave at the same time when the host switches to the line calibration mode;

[0024] The slave control unit includes a slave that sends a step-by-step increase in optical power by pressing a button. The host simultaneously measures the current optical power and records the result, then performs a logical operation and displays the corresponding relationship between the two ends on the host screen to obtain the calibration result. During calibration, if the receiving and sending powers of the optical path being calibrated differ greatly, the host issues an alarm to indicate that there is a problem with the optical fiber link.

[0025] When the host switches to fault finding mode, the two ends of the optical fiber core are inserted into the host and the slave respectively. The slave sends a fixed optical power, the host measures the received optical power, and calculates the difference between the received and sent power to determine whether there is a problem with the current optical fiber link.

[0026] Furthermore, the AT32F421 series microcontroller includes a 32-bit RISC core, a 120MHz operating frequency, and a CortexTM-M4 core with a set of DSP instructions and a memory protection unit for improving application security; built-in embedded memory, enhanced I / O ports and peripherals connected to two APB buses.

[0027] Furthermore, the fault location unit is provided with an optical fiber interface, and the optical fiber to be located is manually connected to the optical fiber interface, and the test is directly connected to the controller, so that the fault information is sent to the processor in time;

[0028] The test is performed by emitting light pulses into the optical fiber and receiving the returned information at the port. When the light pulses are transmitted in the optical fiber, they will be scattered and reflected due to the properties of the optical fiber itself, connectors, joints and bends. The scattering and reflection will be returned to the module. The returned useful information is measured by the detector as the time or curve fragment at different positions in the optical fiber. The time taken from the emission signal to the return signal is then used to determine the speed of light in the material and calculate the distance to find and locate the cause of the fault.

[0029] Furthermore, the information displayed on the screens of the host display unit and the slave display unit is used to influence the accuracy and speed of phase reading. The screen display includes the optical fiber pairing status, optical power test results, and real-time light reflection waveform data of the fault location test. It is interactive and easy to operate, and the screen display is used for communication.

[0030] The beneficial effects of the present invention are as follows: the six optical fibers at one end of the optical cable are simultaneously connected to the six optical ports of the host, and the six optical fibers at the other end are simultaneously connected to the six optical ports of the slave. The slave can send a step-by-step optical power increase by pressing a button. The host simultaneously measures the current optical power and records the result, then performs a logical operation, displays the corresponding relationship between the two ends on the host screen, and obtains the calibration result. The problem of many steps and complicated processes due to the large number of optical cable cores and the need to perform the calibration link and the optical power test link separately is solved. The fault location unit adopts an optical time domain reflection module, which is used for fault ranging and positioning of the faulty optical fiber link. A dedicated optical fiber interface is set. It is necessary to manually connect the optical fiber to be located to the dedicated interface for testing and directly connect it to the controller to send the fault information to the processor in time. The test is carried out by emitting a light pulse into the optical fiber and then receiving the returned information at the port. When the light pulse is transmitted in the optical fiber, scattering and reflection will be generated due to the nature of the optical fiber itself, the connector, the junction, the bend or other events. Part of the scattering and reflection will be returned to the module. The returned useful information is measured by the detector, and they are used as time or curve fragments at different positions in the optical fiber. The distance can be calculated by determining the time taken from the transmission of the signal to the return signal and then determining the speed of light in the material. This solves the problem that the traditional method of manually combining the optical power test results and work experience to find the cause of the fault takes a long time. The LCD screen is used to display the data, which is divided into host display and slave display; the information displayed on the master and slave screens will directly affect the accuracy and speed of phase reading. The selected screen display unit must be able to intuitively display the optical fiber pairing status, optical power test results, and real-time optical reflection waveforms of fault location tests, and should have high interactivity and be easy to operate. This solves the problem that the current use of telephones or intercoms for communication takes a certain amount of working hours, cannot intuitively display the results, is not convenient for multiple groups to carry out at the same time, and has low communication efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the principle structure of the device of the present invention;

[0032] Figure 2 It is a schematic diagram of the principle structure of the host of the present invention;

[0033] Figure 3 is a circuit diagram of a light source emission unit of the present invention;

[0034] Figure 4 is a circuit schematic diagram of a fault location unit of the present invention;

[0035] Figure 5 It is a diagram of a key control unit of the present invention;

[0036] Figure 6 is a flow chart of the host program of the present invention;

[0037] Figure 7 is a schematic circuit diagram of a light source emission unit of the present invention;

[0038] Figure 8 is a flow chart of the slave program of the present invention;

[0039] Fig. 9 It is the principle diagram of the PID algorithm control system of the present invention;

[0040] Fig.10 It is a schematic diagram of the device appearance structure of the present invention. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] like Figure 1-10 As shown, this embodiment discloses a portable multi-channel intelligent optical fiber calibration detection device, which includes a host control unit and a slave control unit, wherein the host control unit is connected to the slave control unit via wireless communication; the host control unit is connected to a host power supply unit, a fault location unit, a host display unit, a light source detection unit, a red light source unit and a line interface unit to be tested; the slave control unit is connected to a slave power supply unit, a slave display unit and a light source emitting unit.

[0043] The design is divided into two parts: the host and the slave. The slave is mainly a light source transmitting device. The screen can display the current power and complete the power switching. The host integrates an optical power meter, a red light pen, and multiple interfaces. Different basic functions can be switched by buttons. The host and the slave communicate in real time through built-in wireless communication.

[0044] When the host switches to the calibration mode, the 6 optical fibers at one end of the optical cable are simultaneously connected to the 6 optical ports of the host, and the 6 optical fibers at the other end are simultaneously connected to the 6 optical ports of the slave. The slave presses a button to send a step-by-step increase in optical power. The host simultaneously measures the current optical power and records the result, then performs a logical operation, displays the corresponding relationship between the two ends on the host screen, and obtains the calibration result. If the receiving and sending powers of the optical path being calibrated differ greatly during calibration, the host will issue an alarm, indicating that there is a problem with the optical fiber link.

[0045] When the host switches to fault finding mode, insert both ends of the optical fiber core into the host and the slave respectively. The slave sends a fixed optical power, the host measures the received optical power, and calculates the difference between the received and sent power to determine whether there is a problem with the current optical fiber link.

[0046] Control unit: A microprocessor is used as the main control unit of the device. The processor unit is the core unit for data processing. Its main function in the master and slave machines is to control the light source emission, light source detection, receiving key commands, etc., coordinate the work of all peripherals, collect measurement results and send the calculation results to the display module.

[0047] Since optical signals require two instructions, control and light emission, key operation requires five instructions to be sent and received, and red light also requires two instructions to be sent and received, in summary, a processor unit that meets the requirements of both the master and slave machines should have at least 20 input and output ports.

[0048] Therefore, the AT32F421 series microcontroller is selected as the core processing unit of the device, that is, the core processing unit of the master and slave. It has a high-performance 32-bit RISC core with a maximum operating frequency of 120MHz. The CortexTM-M4 core has a set of DSP instructions and a memory protection unit to improve application security. It also has built-in high-speed embedded memory, rich enhanced I / O ports and peripherals connected to two APB buses.

[0049] When designing the host, the following aspects were mainly considered: realizing keyboard selection of light wavelength and automatic spectral response correction and switching of functional modes, so that the device not only meets the requirements of optical power measurement; automatic data collection and microcontroller processing and display of measurement results on a LCD screen, etc.

[0050] Hardware composition: light source detection unit, fault location unit, display unit, power supply unit, red light source unit, keyboard control unit.

[0051] Light source detection unit: The light source detection unit is a light source detection unit that includes six groups of receivers. Because the spectral range, anti-interference, response time, and size of the laser detector will directly affect the practicality of the equipment. Therefore, when selecting the laser detection unit, the matching problem with the light source transmitting unit is considered. The light source detection unit is selected to include the spectral range of the light source transmitting unit and a laser detection unit that well solves the matching problem between the transmitter and the receiver.

[0052] Fault location unit: The fault location unit uses an optical time domain reflectometer module, which is used for fault distance measurement and location of faulty optical fiber links. A dedicated optical fiber interface is set up. The optical fiber to be located needs to be manually connected to the dedicated interface for testing and directly connected to the controller to send the fault information to the processor in a timely manner. The test is carried out by emitting a light pulse into the optical fiber and then receiving the returned information at the port. When the light pulse is transmitted in the optical fiber, it will cause scattering and reflection due to the nature of the optical fiber itself, connectors, joints, bends or other events. Part of the scattering and reflection will be returned to the module. The returned useful information is measured by the detector, and they are used as time or curve fragments at different positions in the optical fiber. From the time taken for the transmitted signal to the returned signal, and then determining the speed of light in the material, the distance can be calculated. It solves the problem of manually combining the optical power test results and work experience in the traditional mode to find the cause of the fault, which takes up a long working time.

[0053] Display unit: LCD screen is used to display data, which is divided into host display and slave display; the information displayed on the master and slave screens will directly affect the accuracy and speed of phase reading. The selected screen display unit must be able to intuitively display the fiber pairing status, optical power test results, and real-time optical reflection waveforms of fault location tests, and should have high interactivity and be easy to operate. It solves the problem that the current communication by telephone or intercom takes a certain amount of time, cannot intuitively display the results, is not convenient for multiple groups to carry out at the same time, and has low communication efficiency.

[0054] Red light source unit: The design is based on semiconductor lasers. It emits stable red light through a constant current source drive, and is connected to the optical interface to enter the optical fiber, thereby realizing the optical fiber fault detection function. The laser emitted by the device achieves population inversion, meets the threshold condition and resonance condition, generates stimulated emission of light, and finally emits stable red light.

[0055] Power supply unit: All are lithium batteries, portable and durable, designed to use Depu rechargeable lithium batteries, initially selected 1500mah;

[0056] Key control unit: Issues that should be considered in keyboard design: De-jitter. Due to the elasticity of the mechanical switch contacts, the key will go through a jitter process of about 10ms from the initial press to the stable closure. There is also a similar jitter when the switch is disconnected. There are two methods for anti-jitter: hardware and software.

[0057] This time, the software delay method is used to remove jitter, that is, after detecting that a key is pressed, a delay subroutine of no less than 10ms is executed to detect the key status after the jitter disappears. The second is to prevent string keys. If more than one key is pressed at a time, it is called string keys. It will generate error codes or multiple readings. The solution this time is to only allow the first key pressed or the last key released to generate a code, and other keys will not be read.

[0058] As the control component of the device, the keyboard mainly completes the following tasks: one is function selection, which is used to select the flow of the program according to work requirements; the second is initial setting, which is used to preset the wavelength of the measured light and the calibration parameters when necessary. Together with other control keys, these parameters can be modified at any time and maintained until reset or reset; the third is instrument reset, which is completed by a special reset key.

[0059] The host system program design, only by performing necessary processing on the measured data can the correctness of the collected data be guaranteed. The introduction of the microprocessor is to solve the measurement and data processing that is difficult to achieve by hardware circuits, which can be solved smoothly by software. A system is mainly composed of two parts: hardware and software. According to its function, the software can be divided into two parts, namely the monitoring program used to manage the normal operation of the entire system and the functional program used to perform the required tasks. The main function of the monitoring program is to respond to various service requests from the system or instrument in a timely manner, effectively manage the software and hardware of the measurement and control system itself, exchange information with other devices in the system, and make corresponding processing in time when the system fails. The functions of the monitoring program can be summarized as: keyboard and display management; receiving interrupt request signals; timer management; initialization, function switching, etc.

[0060] The slave hardware design,the device consists of: control unit, light source emitting unit, display unit, power supply unit, and interface unit.

[0061] Light source emitting unit: The light source emitting unit is a light source emitting unit that includes six groups of emitters; considering that most multi-core optical cables in actual applications use four or six cores, and the commonly used optical wavelength in substations is 1310nm, the greater the light intensity, the more accurate the optical attenuation value of the optical fiber loop is measured, so the device selects a laser light source with a light intensity of 100mW. In order to ensure that the effects of optical fiber calibration and optical power measurement are closer to the actual on-site application conditions, the device uses six groups of light sources, and the wavelengths of the emitted light are all adjustable, which solves the problems of a large number of optical cable cores and the need to perform calibration and optical power testing separately, resulting in many steps and complex processes.

[0062] The design uses a semiconductor laser as the light-emitting device, and uses a photoelectrode tube to monitor the backlight of the laser tube, measure its output power, and use this to control the bias current of the laser, forming an automatic power control (APC) circuit with a negative feedback loop to achieve stable power. At the same time, a thermistor is used to form an automatic temperature control (ATC) circuit. Both control circuits are controlled by a single-chip control system and PID algorithm control, which enhances the control of the stability of the semiconductor laser light source, thereby producing a highly stable light source. To achieve the purpose of stabilizing the temperature, the light power output of the stable light source is modulated by the circuit.

[0063] Slave program design, when designing the slave, it should be considered to have real-time processing capabilities, and complete the measurement and control tasks according to the real-time interrupt request of the measured and controlled process. Therefore, the software is usually composed of monitoring programs, interrupt service subroutines, various functional subroutines, and measurement and control algorithm modules. The main functions of the instrument are realized by the interrupt service program and the functional algorithm module; the measurement and control algorithm program mainly realizes the measurement and control tasks of the instrument, and is usually called by the real-time interrupt program or monitoring program.

[0064] The PID control principle is mainly to calculate the corresponding control quantity according to the proportion, integration and differential value of the error signal, and pass it as input to the control system to achieve automatic control. Its control model is:

[0065]

[0066] In the formula, K p is the proportionality coefficient; T i is the integral coefficient; T d is the differential coefficient; e(t) is the error signal,

[0067] e(t)=r(t)-c(t), r(t) is the set value of the controlled quantity; c(t) is the actual output value of the controlled quantity; u(t) is the control signal quantity;

[0068] The set value r(t) is subtracted from the actual value c(t) of the controlled quantity of the controlled system to obtain the error value e(t). The error value e(t) is linearly combined after proportional, integral and differential operations to obtain the control input value u(t) of the controlled system. The controller output is used to control the controlled object to achieve the purpose of automatic control of the controlled system. It is a linear regulator. As can be seen from the above, to form a PID controller, it is necessary to determine K p , T i , T d Three parameters; the process of determining these three parameters is called PID parameter tuning; and the three parameters directly affect the control performance of the system. The proportional link is the link that controls the adjustment deviation; the integral link is mainly used to eliminate static error and improve the system's zero difference. The differential link can reflect the change trend (rate of change) of the deviation signal, thereby speeding up the system's action speed and reducing the adjustment time.

[0069] The innovation of the present invention is that the host integrates a calibration device, an optical power meter, a red light pen, and a multi-channel interface. When using different basic functions, the mode can be switched arbitrarily by pressing a button. The calibration function has a high calibration accuracy, and the information between the master and slave machines is exchanged in real time, which can realize single-person calibration. At the same time, the calibration can observe whether there is an optical path with excessive light attenuation based on the data, and replace the spare wire core in time. When using the defect search function, the optical attenuation of the optical path can be directly measured through the cooperation of the master and slave machines, thereby improving the efficiency of defect processing.

[0070] (1) The portable multi-channel intelligent optical fiber calibration detection device can calibrate 6 optical cables at the same time. The device is easy to connect and has high accuracy, and does not require the cooperation of multiple people.

[0071] (2) The portable multi-channel intelligent optical fiber calibration detection device can not only realize the calibration function, but also test and display the attenuation of each optical cable in real time. It will issue a buzzer warning for the core with large optical attenuation, greatly improving the work efficiency of on-site protection personnel and shortening the protection transformation time.

[0072] (3) The portable multi-channel intelligent optical fiber calibration and detection device integrates a calibration device, an optical power meter, a red light pen, and multiple interfaces. It is easy to switch functions during use, greatly improving the efficiency of defect elimination.

[0073] The multi-functions are integrated into one, which greatly improves the accuracy of optical fiber core calibration, significantly shortens the expansion of substations, the acceptance period of infrastructure construction and the commissioning time, and greatly improves the efficiency of on-site work, which will play a huge role in ensuring safe production, economic benefits and social benefits. It solves the problems of the existing optical fiber calibration method being single, low in efficiency, high in risk, low in accuracy and requiring cooperation of multiple people during the protection replacement process, and effectively improves the efficiency and accuracy of optical fiber calibration. It solves the problem that after the optical cable is laid and calibrated, it is impossible to measure the optical attenuation of a single optical fiber, and the optical fiber quality and on-off status are unclear, which makes it difficult to locate faults in the later stage and increases the workload.

[0074] Multi-channel detection: With multiple detection channels, it can detect multiple optical fiber lines at the same time, improving detection efficiency. High-precision measurement: With advanced measurement technology and algorithms, it can accurately measure the attenuation, reflection and other parameters of the optical fiber to ensure the accuracy of the measurement results. Intelligent control: Through single-chip control technology and embedded systems, the intelligent control and automatic operation of the equipment are realized, reducing the difficulty of operation.

[0075] It helps operation and maintenance personnel to timely discover and solve potential problems in optical fiber communication networks and improve the stability and reliability of network operation. With the continuous advancement of technology and the continuous expansion of applications, multi-channel intelligent optical fiber calibration detection devices will play an important role in more fields and provide more efficient and convenient solutions for the maintenance and management of optical fiber communication networks.

[0076] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A portable multi-channel intelligent optical fiber calibration detection device, comprising a host control unit and a slave control unit, characterized in that: The host control unit is connected to the slave control unit via wireless communication; the host control unit is connected to a host power supply unit, a fault location unit, a host display unit, a light source detection unit, a red light source unit and a line interface unit to be tested; the slave control unit is connected to a slave power supply unit, a slave display unit and a light source transmitting unit.

2. The portable multi-channel intelligent optical fiber calibration detection device according to claim 1 is characterized in that: The host control unit is an AT32F421 series microcontroller, which is used to control light source emission, light source detection and receiving key commands, coordinate peripheral work, collect measurement results and send the calculation results to the display module; The fault location unit includes an optical time domain reflection module, and the optical time domain radiation module is used for fault distance measurement and location of a faulty optical fiber link; The light source detection unit includes six groups of receivers; The red light source unit is a semiconductor laser, and the emitted laser achieves population inversion, satisfies threshold conditions and resonance conditions, generates stimulated emission of light, and emits stable red light for optical fiber fault detection.

3. The portable multi-channel intelligent optical fiber calibration detection device according to claim 1 is characterized in that: The host power supply unit and the slave power supply unit both use lithium batteries, and the capacity of the lithium batteries is not less than 1500mah; the host display unit and the slave display unit both use liquid crystal display screens to display data.

4. The portable multi-channel intelligent optical fiber calibration detection device according to claim 2 is characterized in that: The system program of the host control unit includes a hardware system and a software system. The software system includes a monitoring program for managing the normal operation of the entire system and a functional program for executing the required tasks; the monitoring program is used to respond to various service requests from within the system or instrument in a timely manner, manage the software and hardware of the measurement and control system itself and exchange information with other devices in the system, and take corresponding measures when a system failure occurs.

5. The portable multi-channel intelligent optical fiber calibration detection device according to claim 4 is characterized in that: The control model of the software system is: In the formula, K p is the proportionality coefficient; T i is the integral coefficient; T d is the differential coefficient; e(t) is the error signal, e(t)=r(t)-c(t), r(t) is the set value of the controlled quantity; c(t) is the actual output value of the controlled quantity; u(t) is the control signal quantity; The set value r(t) is subtracted from the actual value c(t) of the controlled quantity of the controlled system to obtain the error e(t). The error e(t) is linearly combined after proportional, integral and differential operations to obtain the control input u(t) of the controlled system. The controller outputs the control to the controlled object, thus achieving the purpose of automatic control of the controlled system.

6. The portable multi-channel intelligent optical fiber calibration detection device according to claim 1, characterized in that: The host control unit includes a method of connecting six optical fibers at one end of the optical cable to six optical ports of the host and six optical fibers at the other end of the optical cable to six optical ports of the slave when the host switches to the calibration mode; The slave control unit includes a slave that presses a button to send a step-by-step increase in optical power, and the host simultaneously measures the current optical power and records the result, then performs a logical operation and displays the corresponding relationship between the two ends on the host screen to obtain the calibration result; During line calibration, if the receiving and transmitting powers of the optical path being calibrated differ greatly, the host will issue an alarm to indicate that there is a problem with the optical fiber link. When the host switches to fault finding mode, the two ends of the optical fiber core are inserted into the host and the slave respectively. The slave sends a fixed optical power, the host measures the received optical power, and calculates the difference between the received and sent power to determine whether there is a problem with the current optical fiber link.

7. The portable multi-channel intelligent optical fiber calibration detection device according to claim 2 is characterized in that: The AT32F421 series microcontroller includes a 32-bit RISC core, a 120MHz operating frequency, and a CortexTM-M4 core with a set of DSP instructions and a memory protection unit for improving application security; Built-in embedded memory, enhanced I / O ports and peripherals connected to two APB buses.

8. The portable multi-channel intelligent optical fiber calibration detection device according to claim 1 is characterized in that: The fault location unit is provided with an optical fiber interface, and the optical fiber to be located is manually connected to the optical fiber interface, and the test is directly connected to the controller, so that the fault information is sent to the processor in time; The test is performed by emitting light pulses into the optical fiber and receiving the returned information at the port. When the light pulses are transmitted in the optical fiber, they will be scattered and reflected due to the properties of the optical fiber itself, connectors, joints and bends. The scattering and reflection will be returned to the module. The returned useful information is measured by the detector as the time or curve fragment at different positions in the optical fiber. The time taken from the emission signal to the return signal is then used to determine the speed of light in the material and calculate the distance to find and locate the cause of the fault.

9. The portable multi-channel intelligent optical fiber calibration detection device according to claim 1, characterized in that: The information displayed on the screens of the host display unit and the slave display unit is used to influence the accuracy and speed of phase reading. The screen display includes the fiber pairing status, optical power test results, and real-time light reflection waveform data of the fault location test. It is interactive and easy to operate, and the screen display is used for communication.

Images