Integrated detector for laser remote sensors

Details Integrated detector for laser remote sensors Integrated detector for laser remote sensors

1996-03-05

1997-12-30

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356236, 356434, G01N 2161

Patent

active

057036918

ABSTRACT:
A remote laser sensor incorporating a single integrated detector. The laser sensor comprises a laser for transmitting laser energy that is applied to a target, and a beamsplitter for sampling of the transmitted laser energy. A telescope is provided for collecting laser energy reflected from the target. The integrated detector comprises an integrating sphere for receiving the sampled transmitted laser energy and for receiving the laser energy reflected from the target, and a detector coupled to the integrating sphere for selectively detecting the sampled transmitted laser energy and the laser energy reflected from the target. A scatter plate may be disposed inside the integrating sphere for preventing photons from entering the detector that result directly from a first scattering event within the sphere. In operation, the laser provides a transmit beam that is directed at the target and reflected energy from the target is collected by the telescope and focused onto the detector. Detector integration is accomplished by using a single detector chip mounted to a rear surface of the integrating sphere, which allows sampling of the entire cross-section of the laser transmit beam. The beamsplitter is employed to sample a portion of the transmit beam which is applied to the detector.

REFERENCES:
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patent: 4061918 (1977-12-01), Preier et al.
patent: 4770530 (1988-09-01), Van Aken et al.
Ben-David et al. "High Pulse Repetition Frequency, Multiple Wavelength, Pulsed CO2 Lidar System for Atmospheric Transmission and Target Reflectance Measurements".
DE-A-28 34 983 (Blazek).
Dennis "Infra-Red Lasers and Their Use in Atmospheric Pollution Monitoring" .

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