Method for compensating APD temperature drift in Raman distributed optical fiber temperature measurement system
A distributed optical fiber and optical fiber temperature measurement technology, which is applied in the field of APD temperature drift compensation, can solve the problems of increased demodulation error, reduced temperature measurement accuracy, and deterioration of measurement accuracy, and achieves the effect of improving accuracy
Active Publication Date: 2020-06-19
中船海洋探测技术研究院有限公司
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Avalanche photodiodes (APDs) have been widely used in the field of photodetection technology due to their extremely high sensitivity gain. In optical fiber sensing systems, APDs are commonly used as the preferred detectors for extremely weak light signals, but the gain of APDs is affected by temperature. The impact is obvious, so the temperature drift of the APD gain will cause the deterioration of the measurement accuracy when detecting the intensity type signal, and seriously af
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[0045] The present invention will be specifically described below in conjunction with the accompanying drawings and embodiments.
[0046] figure 1 Shown is the schematic structural diagram of the R-OTDR demodulation system provided by the embodiment of the present application. The optical fiber temperature measurement system includes a pulsed laser 1, a wavelength division multiplexing mode 2, and a reference optical fiber module (thermal silica gel sheet 3, reference optical fiber 4, electrical measurement Temperature sensor 5), the first APD detector module 7, the second APD detector module 8, analog-to-digital conversion acquisition module 9 and control center 10;
[0047] The pulse laser 1 emits a narrow pulse laser, enters the wavelength division multiplexing module 2 through the 1550 port of the wavelength division multiplexing module 2, then couples into the reference fiber module through the Com port, and then enters the measured fiber 6 through the reference fiber 4; ...
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The invention discloses a method for compensating APD temperature drift in a Raman distributed optical fiber temperature measurement system. The optical fiber temperature measurement system comprisesa pulse laser, a wavelength division multiplexing module, a reference optical fiber module, a first APD detector module, a second APD detector module, an analog-to-digital conversion acquisition module and a control center. According to the invention, the influence of gain floating of an APD detector module and a subsequent amplification circuit due to the temperature change of the working environment can be eliminated, and the temperature measurement precision of the measurement system is improved; and meanwhile, global calibration temperature measurement of a global sensing optical fiber isavoided, and only the temperature of the reference optical fiber with the local length of 10m-300m needs to be measured, so that the engineering quantity is greatly simplified in engineering operation.
Description
technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a method for compensating APD temperature drift in a Raman distributed optical fiber temperature measurement system. Background technique [0002] The Raman distributed optical fiber temperature measurement system uses optical fiber as a temperature sensing element. Each point on the optical fiber is a temperature measurement element, which can realize simultaneous temperature measurement at multiple points in a wide range, and the temperature-sensing optical fiber can be pressed according to actual needs. Arranged in a certain spatial position, so that the spatial measurement of the three-dimensional temperature field can be realized. This emerging temperature measurement technology is based on the Raman scattering characteristics of optical fibers, combined with the principle of optical fiber laser radar to realize distributed temperature detection. [0003] Raman...
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Login to View More IPC IPC(8): G01K11/32G01K1/20G01K11/324
CPCG01K11/32G01K1/20G01K2219/00G01K11/324
Inventor 程犁清钱汉明赵明马琦
Owner 中船海洋探测技术研究院有限公司