Optics: measuring and testing – Photometers – Photoelectric
Patent
1991-07-11
1993-02-09
Rosenberger, Richard A.
Optics: measuring and testing
Photometers
Photoelectric
356121, 356222, 340931, G01J 142, G08G 1097
Patent
active
051856379
ABSTRACT:
A portable traffic signal photometer is capable of rapidly and effectively measuring the intensity of light emanating from a traffic signal light. The photometer includes a housing member with a circular front opening for engagement with the lens of a traffic signal light. The photometer is pressed against the lens, and the light emanating from the traffic signal light is directed through an optical filter located inside the housing, which permits light from the traffic signal light emanating at a predetermined downward angle to pass through it. The light from the filter is directed onto a light-sensitive device, which produces an output signal proportional to the intensity of the light emitted by the traffic signal lens. Additional light-responsive photocells are provided to produce signals indicative of the respective color of the traffic signal light being measured by the photometer, and the composite of the color and the light intensity is used to produce a display which permits the user to determine whether the traffic signal light is properly operating within its designed specifications.
REFERENCES:
patent: 2291114 (1942-07-01), Squyer
patent: 3527540 (1970-09-01), Bowker et al.
patent: 4401386 (1983-08-01), Yuasa et al.
patent: 4914738 (1990-04-01), Oda et al.
patent: 4948249 (1990-08-01), Hopkins et al.
Howell Ladd
Lewin Ian
Lighting Sciences, Inc.
Pham Hoa Q.
Ptak LaValle D.
Rosenberger Richard A.
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