Portable luminescence sensor

Details Portable luminescence sensor Portable luminescence sensor

1985-05-31

1987-11-24

Evans, F. L.

Optics: measuring and testing

By shade or color

With color transmitting filter

2504581, 356419, G01N 2164

Patent

active

047084758

ABSTRACT:
Apparatus is provided to sense and measure solarinduced 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 assembly carrying the narrowband filters and fine tuning means are employed to facilitate the selection of the predetermined Fraunhofer Line frequency.

REFERENCES:
patent: 3598994 (1971-08-01), Markle
patent: 3641344 (1972-02-01), Markle
patent: 3769516 (1973-10-01), Markle et al.
patent: 3864037 (1975-02-01), Johnson
patent: 4045670 (1977-08-01), Anderson et al.
patent: 4195932 (1980-04-01), Popelka
patent: 4236071 (1980-11-01), Chimenti
patent: 4433245 (1984-02-01), Poultney
patent: 4478513 (1984-10-01), Skinner et al.
Slater, Remote Sensing Optics and Optical Systems, 1980, pp. 269-287.

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