Optical device with adjusting means

Details Optical device with adjusting means Optical device with adjusting means

1983-06-30

1989-09-12

Henry, Jon W.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350318, 350484, 350588, 356317, G02B 700, G02B 724, G02B 526, G02B 528

Patent

active

048654248

ABSTRACT:
Apparatus is provided to sense and measure solar-induced luminescence, as well as reflectance, within the field of view of a target window for receiving a composite ray of light from the target. A first filter within the path of the composite ray of light transmits a first narrowband component thereof, including a predetermined Fraunhofer Line frequency, to a first sensor. A second narrowband component thereof, proximate the Fraunhofer Line frequency, is directed to a second sensor such that ratios of the electromagnetic energy impinging, respectively, on the first and second sensors may be determined. A removable filter tray carrying the narrowband filters and fine tuning means is employed to facilitate the selection of the predetermined Fraunhofer Line frequency.

REFERENCES:
patent: 3840284 (1974-10-01), Rand
patent: 4123148 (1978-10-01), Laird

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