Behavioral Model of Optical Feedback Self-mixing Interference Effect and Displacement Measurement Systems
|Course||Circuits and Systems|
|Keywords||Optical feedback self-mixing interference Analog behavioral models Displacement measurement orCAD10.5|
Optical feedback self-mixing interferometry technique is emerging as a sensing measurement technology , the measurement technique can be used for measurement of displacement , distance, speed and other physical quantities , and laser measurement parameters . Optical feedback self-mixing interferometry system , reflected or scattered light intensity changes and system of non-linear phenomena will cause changes in the model of self-mixing interference , thus affecting the self-mixing interference signal waveform , and these changes will increase the measurement process complexity in data processing , this problem has also become an important factor in practical hinder optical feedback self-mixing interferometry technology . In order to simplify the data processing , the paper based on the the Cadence Company 's orCAD10.5 an optical feedback self-mixing interference effects in analog behavioral models and interferometric displacement measurement system optical feedback mixed analog behavioral model established on this basis . It by a series of basic components such as resistors, capacitors , amplifiers , triggers the form of analog electronic circuits , not only visual, clear physical meaning , and simplifies the process of solving nonlinear equations self- mixing interference phenomenon . Created displacement measurement system model is a high-precision , real - time displacement measurement system model , based on the optical feedback self- mixing interferometry system hardware design has important reference value . This paper first analyzes the theoretical model of optical feedback self-mixing interference effects , established on the basis of the mathematical model of three - mirror cavity optical feedback self-mixing interference effects analog behavioral models , and simulation results with theoretical and experimental comparison . Second, the optical feedback self- mixing interference effects analog behavioral models based on established optical feedback self- mixing interference displacement measurement system analog behavioral models , automatically and in real-time to restore the displacement information analysis and simulation results . Measurement system suitable for any optical feedback conditions , the measurement error is small , under moderate light conditions measurement error ± 7nm or less . And displacement reconstructed on the experimental data , experimental absolute error of less than ± 80nm further verify the correctness of the model . Finally, a summary of the full text and the prospect to be talk further explore this area .