Laser triangulation range finder based on a chaotic modulation and detection system

Mario Antonio Stefani; Jose Carlos Pizolato Jr.; Luiz Goncalves Neto

doi:10.1117/12.395083

4 August 2000 Laser triangulation range finder based on a chaotic modulation and detection system

Mario Antonio Stefani, Jose Carlos Pizolato Jr., Luiz Goncalves Neto

Proceedings Volume 4052, Signal Processing, Sensor Fusion, and Target Recognition IX; (2000) https://doi.org/10.1117/12.395083
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

A laser triangulation range finder based on a chaotic and detection scheme is presented. An elementary non-linear electronic oscillator composed by two operation amplifiers with feedback current form two antiparallel diodes generates a chaotic signal that is used to generate a chaotic clock modulation with a well-defined broad band spectrum. This chaotic clock modulates a laser beam that is transmitted and received by a collecting optics in a laser triangulation range finder scheme. A band limited phase delay equalized amplifier sends the received signal to a balanced demodulator using the same chaotic generated signal as 'local oscillator'. A low pass filter is tuned to assure good compromise against noise immunity and the desired response speed. This modulator scheme allows several laser stations to operate in same working area, avoiding carefully adjusted field-of-view screening and cross-detection false alarm due to the interference of other laser stations. The chaotic modulator can be used as an alternative for microprocessor based pseudo random sequence generator when board space or cost is a critical system specification. The laser triangulation range finder has a range of 0.5m to 2m using a 3mW class IIIa visible laser, with precision of 5 mm.

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Mario Antonio Stefani, Jose Carlos Pizolato Jr., and Luiz Goncalves Neto "Laser triangulation range finder based on a chaotic modulation and detection system", Proc. SPIE 4052, Signal Processing, Sensor Fusion, and Target Recognition IX, (4 August 2000); https://doi.org/10.1117/12.395083

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KEYWORDS

Laser range finders

Modulation

Oscillators

Clocks

Semiconductor lasers

Signal generators

Diodes

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