A Gain Stabilization Control Method of Distributed Optical Fiber Temperature Measurement System
A stable control method and technology of distributed optical fibers, which are applied in the direction of using electric mode for temperature control, auxiliary controller with auxiliary heating device, etc., can solve the problem of laser source power changing with temperature, and improve the stability of temperature measurement. And the effect of temperature measurement accuracy, low power consumption and small size
Active Publication Date: 2017-01-25
PEGASUS QINGDAO OPTOELECTRONICS
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[0005] The technical problem solved by the present invention is to provide a method for controlling the gain stability of a distributed optical fiber temperature measurement system, the purpose of which is to simultaneously solve the problems of APD gain change and laser source power change with temperature through the process of calibration and gain stability adjustment
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[0030] Such as Figure 1-Figure 2 As shown, the present invention provides a method for gain stabilization control of a distributed optical fiber temperature measurement system. The distributed optical fiber temperature measurement system is used for gain stabilization control. The system includes a laser generator connected in sequence and a wavelength division with a bidirectional coupler The multiplexer, the optical fiber thermostat box, and the external optical fiber also include an APD amplifier module connected to the wavelength division multiplexer, and an acquisition control module connected to the APD amplifier module; the optical fiber thermostat box is provided with a temperature sensor and a TEC control module, The acquisition control module is provided with a temperature control circuit and a bias control circuit. The acquisition control module is connected to the optical fiber thermostat via the temperature control interface, and is connected to the bias adjustment...
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The invention provides a distributed-type optical-fiber temperature measurement system gain stability control method. A distributed-type optical-fiber temperature measurement system is adopted to perform gain stability control. The system comprises a laser generator, a wavelength division multiplexer with a bidirectional coupler, an optical-fiber constant-temperature box, an external optical fiber, an APD amplification module connected with the wavelength division multiplexer, and an acquisition control module connected with the APD amplification module which are successively connected. Through calibration and gain stability adjusting processes, the method simultaneously solves the problem of a gain change of an APD and the problem that laser source power changes with temperature, so temperature measurement stability and temperature measurement precision of the system are improved. A temperature-light average value corresponding table is established, a current calculated light average value is compared with a light average value, corresponding to a current read temperature value, in the temperature-light average value corresponding table, a bias voltage value of the APD is adjusted according to a difference value, and a system gain is ensured to be kept stable. The method has the advantages of high reliability, convenient operation and high universality, and is convenient for industrial production applications.
Description
Technical field [0001] The invention relates to the technical field of distributed optical fiber temperature sensing, in particular to a feedback control method for gain stability control of a distributed optical fiber temperature measurement system. Background technique [0002] The stability of the distributed optical fiber temperature measurement system is often affected by the laser source and APD module, which affects the stability and temperature measurement accuracy of the distributed optical fiber temperature measurement system. As a typical photoelectric subsystem, the distributed optical fiber temperature measurement system requires high stability of the pulsed laser source and stable output power of the laser. When the laser is used for a long time, the output power will naturally age and decrease. The change of ambient temperature also affects the stability of laser output power. The photodiode in the APD module contains extremely high gain, but the gain of the APD ...
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IPC IPC(8): G05D23/30
Inventor 王立魏茂安姜海龙
Owner PEGASUS QINGDAO OPTOELECTRONICS