Abstract
With the aim to determine parameter influences of a measurement system based on optical feedback interference in a laser diode, a mathematic model of optical feedback interference effect is built. LabVIEW which is a kind of graphical programming language is used to realize parameter setting and graphic display by front panel and program chart. Experimental results show that the stripes of optical feedback interference effect are saw-tooth-like waveform when feedback level factor is less than and close to 1, which can be used to determine moving direction of external reflecting object. Feedback interferences generate when vibration amplitude of reflecting surfaces is greater than λ/4. The stripe number is 4N when vibration amplitude dL equals Nλ. Vibrational frequency of external reflecting surface equals the frequency of feedback interference signal and has no influence on stripe number in a period. Measurement of external reflecting object based on optical feedback interference effect has measurement precision less than laser wavelength and real time direction recognition ability.
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