Vibration Menasurement Based On Optical Feedback Self-Mixing Interference

Optical feedback interferometry laser by eliminating the adverse effects of optical feedback and derived a new type of sensor research. Elimination of optical feedback on the process of discovery affect the optical feedback interference and external reflectors for displacement, vibration, distance and laser line width factors are related to optical feedback interferometry will lead to the use of optical feedback and for Measurement of application. Optical feedback interferometry, compared with the traditional two-beam interference, in theory there are many similar studies will be with optical feedback, while there are the traditional two-beam interference can not match the superiority of the test result by the sensor field of concern. Domestic and foreign interference has been measured based on optical feedback on the target movement, morphology and laser parameters of measurement.This feedback interference theory of light made a brief and use Freescale's 32-bit processor and 8-bit processor MCF52259 and HC9S08QG8, based on optical feedback interferometry fringe counting method to achieve vibration measurement control system. The main contents include the following:First, according to the theory based on optical feedback interference fringe counting method, a vibration signal reconstruction model; designed filter; and apply MATLAB model of the vibration signal reconstruction and filter simulation analysis, vibration measurement system for the structures laid an important theoretical basis.The re-designed and built for the interference theory of light based on feedback vibration control system and run the test.In addition, optical feedback technique for improving the vibration-based monitoring system was based on HC9S08QG8 part of the design and experimental.Finally, conclusions are drawn from the whole paper and the vibration measurement system made perfect prospect.