Open AccessCorrection of error induced by nonlinear movement of feedback mirror in laser feedback stress measurment system
Author(s) -
Haisha Niu,
Yanxiong Niu,
Ning Liu,
Wenwen Liu,
Caili Wang
Publication year - 2015
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.64.084208
Subject(s) - displacement (psychology) , optics , nonlinear system , laser , interferometry , measure (data warehouse) , optical path , stress (linguistics) , computer science , control theory (sociology) , function (biology) , work (physics) , physics , artificial intelligence , control (management) , linguistics , philosophy , quantum mechanics , psychology , database , evolutionary biology , psychotherapist , biology , thermodynamics
Stress distribution of optical materials can be measured by using the laser feedback effect. Owing to the non-linear movement of the feedback mirror, the result accuracy of the system will decrease. In this work, we measure the displacement of the feedback mirror by using a high precision quasi-common-path laser feedback interferometry. The displacement-time function is obtained by a high-end fitting method. The stress measurement error induced by the non-linear movement of the feedback mirror is calculated according to the displacement-time function and a three-mirror cavity equivalent model, and the correction for the system accuracy is achieved. The results show that the different movement direction of the feedback mirror gives rise to an opposite variation trend of error. Measurement error can be reduced by averaging the results in different directions. In the study we analyze the influence of the non-linear movement of the feedback mirror on the measurement accuracy, and a method of improving the error is proposed. This method is significant for correcting the measurement results and improving the accuracy.