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Backscattered light distributed amplification device and control method thereof

A backscattering and amplifying device technology, applied in the direction of measuring devices, using wave/particle radiation, instruments, etc., can solve the problems of reducing the measurement distance, signal saturation distortion in the front part of the curve, and large error of measurement results, etc., to achieve the elimination of measurement results Effect of error, elimination of signal saturation distortion, consistent vibration amplitude

Active Publication Date: 2016-04-27
ANHUI NORMAL UNIV
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Problems solved by technology

Therefore, the existing methods have the following defects and deficiencies: 1. The large amplification factor will lead to saturation and distortion of the signal in the front section of the curve, making the measurement results wrong; 3. The vibration signal at the end of the curve is weak, which reduces the measurement distance of the system; 4. The vibration amplitude of the vibration signal is inconsistent, the vibration amplitude of the signal at the front end of the curve is large, and the vibration amplitude of the signal at the end of the curve is small

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  • Backscattered light distributed amplification device and control method thereof
  • Backscattered light distributed amplification device and control method thereof

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Embodiment Construction

[0026] The invention is a distributed amplification device for backscattered light. According to the position distribution of the backscattering curve, the device uses different amplification factors to amplify different positions in time-sharing, which eliminates the amplification saturation phenomenon in the front section of the curve and increases the The amplification factor of the signal at the end of the curve is improved, and the quality of the signal at the end of the curve is improved. At the same time, different amplification factors are used to amplify different positions by time-sharing, so that the vibration amplitudes of the front-end signal and the end signal of the curve are consistent.

[0027] see figure 1 It can be seen that the device includes a photodetector 1, a signal amplifier 2, an output signal interface 3, a gain control synchronous signal interface 4, a buffer 5, a gain controller 6, and a parameter regulator 7. The photodetector 1 will back Rayleigh...

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Abstract

The invention discloses a distributed amplification device for a back scattering light. According to the distributed amplification device, the input end of a photoelectric detector for receiving a back Rayleigh scattering light signal is connected with an optical fibre; the input end of a signal amplifier is connected with the output end of the photoelectric detector; the output end of the signal amplifier is connected with an output signal interface; the control end of the signal amplifier is connected with the output end of a gain controller; one input end of the gain controller is connected with the output end of a buffer; the other input end of the gain controller is connected with the output end of a parameter adjustor; the input end of the buffer is connected with a gain control synchronizing signal interface. According to the device disclosed by the invention, the amplification coefficient of a tail-end signal is increased, the amplification coefficient of a front-end signal is reduced, and the quality of the tail-end signal is improved, thus increasing the measurement distance of a system, and keeping the amplitudes of the front-end signal and the tail-end signal consistent.

Description

technical field [0001] The invention relates to a distributed amplifying device for backscattered light, in particular to a device for amplifying backscattered signals in a distributed optical fiber vibration sensing system. Background technique [0002] Distributed optical fiber vibration sensing system is mainly used in transportation, electric power, coal mine, petrochemical and other industries, and its function is to monitor these important places in real time. It plays an important role in ensuring the normal operation of industrial system equipment and ensuring the safety of life and property. [0003] The existing distributed optical fiber vibration sensing system is composed of a laser, a pulse modulator, a synchronous controller, an optical fiber amplifier, a circulator, an optical filter, a photoelectric detector, a signal amplifier, a data collector and a computer. Its working principle is: the laser continuously emits pulsed light into the sensing fiber, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
Inventor 周正仙袁扬胜余瑞兰周瑞
Owner ANHUI NORMAL UNIV
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