Method and assembly for measuring equivalent sphere illumination

Details Method and assembly for measuring equivalent sphere illumination Method and assembly for measuring equivalent sphere illumination

1979-09-17

1982-03-23

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

G01J356221

Patent

active

043209696

ABSTRACT:
The present invention relates to systems for assessing the quality of illumination provided by a lighting environment to a task location in terms of the ability of that illumination to render the contrast of a visual task at the task location. Past systems have been inaccurate, inflexible, or required trained personnel and bulky equipment to make such an assessment. The present system accomplishes this assessment by generating a series of electrical signals, each such signal corresponding to the luminous flux impinging at the task location provided by a discrete, substantially non-overlapping zone of the lighting environment. These signals, when associated with the position of the corresponding zones, accurately describe the flux distribution of the lighting environment, and are used to calculate Equivalent Sphere Illumination, a figure of merit for that lighting environment.

REFERENCES:
patent: 3912399 (1975-10-01), Griffith et al.
patent: 4055383 (1977-10-01), Zeller et al.
RQQ Report No. 4--"A Method of Evaluating the Visual Effectiveness of Lighting Systems," R. T. Dorsey et al., Illuminating Engineering, Aug. 1970, pp. 504-513.
"An Instrument for the Measurement of Equivalent Sphere Illumination," Dilaura, D. L. et al., Journal of IES, Apr. 1978, pp. 183-189.
RQQ Report No. 5--"The Predetermination of Contrast Rendition Factors for the Calculation of Equivalent Sphere Illumination," I. Lewin et al., Journal of IES, Jan. 1973, pp. 150-156.
Sastri, V. D. et al., "A Sky-Scanning Photometer for the Luminance Distribution of Sky," Pure and Applied Geophysics, vol. 113, No. 3, pp. 375-387.

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