Anti-baseline drift laser vibration measurement method and system based on synchronous carrier recovery

By recovering the synchronous carrier signal in the laser Doppler vibration measurement system and using an adaptive filtering algorithm, the vibration measurement accuracy problem caused by baseline drift is solved, and the effect of high-precision and low computing power is achieved to eliminate baseline drift.

CN119642953AActive Publication Date: 2025-03-18SHANDONG SANHUI OPTOELECTRONICS TECHNOLOGY CO LTD
9 Cites 0 Cited by

Patent Information

Application Number
CN202411684190.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-22
Publication Date
2025-03-18
Estimated Expiration
2044-11-22

AI Technical Summary

Technical Problem

In laser Doppler vibration measurement technology, baseline drift leads to nonlinear bias of the vibration measurement results, affecting the measurement accuracy, and especially the detection effect of weak vibration signals is not good.

Method used

By improving the optical path of the laser Doppler vibration measurement system, a reference arm is added to restore the synchronous carrier signal, and an adaptive variable step normalized LMS adaptive filtering I&Q orthogonal demodulation algorithm based on error trend is used to remove baseline drift.

Benefits of technology

It realizes effective elimination of baseline drift in laser vibration measurement signals, improves measurement accuracy, reduces the requirements for computing power, and improves the real-time and efficiency of the system.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses an anti-baseline drift laser vibration measurement method and system based on synchronous carrier recovery, and relates to the technical field of laser vibration measurement, and the method comprises the steps: theoretically analyzing the generation reason of baseline drift in a demodulation signal for a laser Doppler vibration measurement system, and determining a key optical path device causing the baseline drift; according to the generation reason of baseline drift and a key optical path device, the optical path of the laser Doppler vibration measurement system is improved, a reference arm is additionally arranged to change an optical path transmission mode, and a synchronous carrier signal is recovered; through an improved laser Doppler vibration measurement system, Doppler signals and synchronous carrier signals are acquired by using a high-speed analog-to-digital converter, and temperature-gain and offset compensation is performed on the acquired signals by using a table look-up method; based on the compensated Doppler signal and the synchronous carrier signal, adopting an adaptive filtering algorithm and Iamp based on an error trend; and a Q orthogonal demodulation algorithm is used for processing, demodulating and extracting the vibration signal. According to the invention, the baseline drift in the demodulation signal can be effectively eliminated.
Need to check novelty before this filing date? Find Prior Art