Object detection using two channel active optical sensors

Details Object detection using two channel active optical sensors Object detection using two channel active optical sensors

1989-10-02

1991-02-26

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250341, G01S 1702

Patent

active

049964305

ABSTRACT:
An apparatus for detecting target objects which exhibit ratios of reflectance values that are substantially the same at two separated wavelengths when compared with background objects having reflectance values that are substantially different at the same two wavelengths has a two channel active optical sensor and logic circuitry. A first signal is transmitted at a wavelength lambda-1 which is different from a second signal which is transmitted at a wavelength lambda-2. The two signals are directed towards an object which reflects the signals therefrom. The reflected signals are received and a ratio is calculated. The ratio is compared with a predetermined threshold value to indicate when a target object has been identified.

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M. Umeno, H. Hattori, T. Jimbo and M. Sakamoto, "A Dual Spectral-Band Infed Thermo-Ratioscope," Proceedings of ICO-11 Conference, Madrid, Spain (Sep. 10-17, 1978) pp. 803-806.

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