A Receiver Optical Power Control System for Optical Fiber Vibration Sensing

Abstract

The invention discloses a receiving end optical power control system used for fiber vibration sensing. A light emission port of a light source is connected with a light divider through a vibration sensing fiber. A second light division branch of the light divider is connected with an optical path of an optical detector. The optical detector converts light signal intensity into a light intensity simulation electric signal. An amplifier is used for amplifying the light intensity simulation electric signal. An analog-digital converter converts the amplified light intensity simulation electric signal into a digital signal used for representing light intensity. A threshold value judger is used for judging whether the digital signal used for representing light intensity is lower than a normal optical power threshold value, and if yes, an output number is amplified. An optical power adjuster is used for converting the adjusted number into a simulation signal. A driving circuit adjusts the driving current intensity of the light source according to the simulation signal so as to adjust the output optical power of the light source. According to the invention, the system is capable of acquiring relatively stable receiving optical power at the end of the optical detector in a low-cost resonant sensing system.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more specifically relates to a receiving end optical power control system for optical fiber vibration sensing. Background technique [0002] In general fiber optic vibration sensing systems, the design of fixed output light power is generally adopted. Using a fixed output light power can ensure the stability of the output power of the light source. However, during the installation and deployment of the fiber optic vibration sensing system, different coupling forms of the sensing fiber and the length of the sensing fiber will cause different degrees of loss of the optical signal in the fiber link. In this way, even if two sets of optical fiber vibration sensing devices with exactly the same outgoing optical power, it is difficult to obtain the same incident (received) optical power in different installation and deployment environments. [0003] Received optical power is an impo...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a receiving end optical power control system for optical fiber vibration sensing, the purpose of which is to provide a low-cost vibration sensing system that can receive A system that obtains relatively stable received optical power at the end, thereby solving the technical problem that the low-cost vibration sensing system in the prior art cannot obtain relatively stable received optical power at the photodetector end

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