Optical power control method and device for optical fiber vibration sensing

Abstract

The invention discloses an optical power control method used for optical fiber vibration sensing. The optical power control method comprises the steps that step one: receiving end optical power is acquired; step two: whether the receiving end optical power is lower than a preset normal optical power threshold is judged, the process turns to the step four if the judgment result is yes, or the process turns to the step one; step four: the present value of an optical power regulating module increases first preset regulating step length, wherein the present value of the optical power regulating module is used for regulating driving current of a light source; step five: whether the driving current of the light source exceeds the upper limit of the rated working current of the light source is judged, the process turns to the step eight if the judgment result is yes, or the process turns to the step one; and step eight: the present value of the optical power regulating module decreases second preset regulating step length and the process turns to the step one. The method of obtaining the relatively stable receiving optical power at the photodetector end in a low cost vibration sensing system is provided. Besides, the invention also provides an optical power control device used for optical fiber vibration sensing.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more specifically relates to an optical power control method and device 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 import...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides an optical power control method and device for optical fiber vibration sensing, the purpose of which is to provide a low-cost vibration sensing system that can receive optical signals A method for obtaining 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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