DISPLACEMENT MEASURING DEVICE BASED ON SEMICONDUCTOR INJECTION LASER WITH EXTERNAL OPTICAL FEEDBACK

摘要

FIELD: optical measurements. SUBSTANCE: device has optical head consisting of injection laser, photodiode, microscope objective and controlled filter. In addition, device has control unit which includes regulator of laser current and temperature, triangle-voltage generator, photocurrent-to-voltage converter, selective amplifier, and indicator. Use is also made of pulse phase detector, comparator and reversible counter. EFFECT: higher measurement results. 3 dwg