DSP-based comparison-division type optical fiber high-precision frequency measurement sensor

Abstract

The invention relates to the technical field of rotor rotational frequency measurement, and provides a DSP-based comparison-division type optical fiber high-precision frequency measurement sensor capable of realizing high-precision measurement. The sensor comprises a laser source, an optical fiber probe, a prepositioned circuit and a DSP chip, wherein the laser source is used for emitting laser to the optical fiber probe; the optical fiber probe comprises an emitting optical fiber and two groups of receiving optical fibers, the emitting optical fiber emits received laser onto a rotor blade to be measured, and the receiving optical fibers are used for receiving reflected laser reflected by the rotor blade to be measured; the prepositioned circuit is used for receiving two groups of reflected laser transmitted by the optical fiber probe, and calculating the two groups of laser to obtain a voltage real-time ratio; and the DSP chip is used for processing the voltage real-time ratio to obtain a voltage frequency, and subjecting the voltage frequency to linear transformation to obtain a rotational speed.

Description

technical field [0001] The invention relates to the technical field of rotor rotation frequency measurement, in particular to an optical fiber high-precision frequency measurement sensor. Background technique [0002] An object without its own axis of rotation can be regarded as a rotor when a rigid connection or an additional axis is used, and the rotor, as the rotating part of the motor, is an important part. Usually the rotor consists of a rotating shaft, a rotor core and a rotor winding. The rotor rotation frequency is one of the most important parameters in social life and production practice. [0003] In order to measure the frequency of the rotor, various frequency measuring instruments have appeared on the market. In order to adapt to the high voltage and strong electromagnetic interference environment, fiber optic sensors with good insulation characteristics and anti-interference ability are usually used for measurement. However, due to the different degrees of lo...

AI Technical Summary

Problems solved by technology

However, due to the loss of different degrees of light waves in the transmission process of the optical fiber, some light sources will be coupled into the optical fiber, which will cause the instability of the power of the light source and make the optical fiber signal unable to fully reflect the rotational frequency of the rotor to be tested. signal, it is impossible to achieve high-precision micro-frequency measurement, so there is an urgent need for a sensor that can achieve high-precision measurement

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