A laser triangulation range finder based on a chaotic modulation and detection system

被引：0

作者：

Stefani, MA ^{[1
]}

Pizolato, JC ^{[1
]}

Neto, LG ^{[1
]}

机构：

[1] Opto Electron SA, Sao Carlos, SP, Brazil

来源：

SIGNAL PROCESSING, SENSOR FUSION, AND TARGET RECOGNITION IX | 2000年 / 4052卷

关键词：

laser triangulation range finder; chaotic modulation; chaotic electronic circuit; broad band spectrum; non-linear system;

D O I：

10.1117/12.395083

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

A laser triangulation range finder based on a chaotic modulation and detection scheme is presented. An elementary non-linear electronic oscillator composed by two operational amplifiers with feedback current from 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 dock 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 modulation scheme allows several lasers 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 0.5 m to 2 m, using a 3 mW class ma visible laser, with precision of 5 mm.

引用

页码：321 / 326

页数：6