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Computer Aided Laser Ranging And Detection System

This paper describes the development and fabrication of a low cost ranging and detection system. The system employs a pulsed GaAlAs semiconductor laser diode transmitter operating at 820 nm wavelength, where the atmospheric attenuation is reasonably low. A high sensitivity PIN diode receiver captures the reflected laser beam from the target and provides digital output directly. An ECL counter triggered by a high frequency crystal oscillator measures the time of flight of laser pulse and consequently range is calculated. An IBM (AT) compatible personal computer performs the necessary computations and displays the range, velocity and position of the target. The use of personal computer provides hardware and software flexibility to the user and minor system modifications to suit any particular application can be achieved at low cost.