Design a laser distance meter for narrow distance range. Laser is to be AM modulated at 30 MHz and reflected from a target between 1 to 5 meters away from the laser. Reflected laser radiation is intercepted byy a photo detector whose output yoields the AC modulation signal with a phase shift relative to tat of the radiation generated at the laser output. The original modulation signal and the demodulated signal are send to a mixer who yields a DC signal proportiobnal to twice the distance from laser to target.
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I have made distance measurement unit using ultrasound sensors, I can also make product using laser. I have experience of product development and testing.