Illumination measurement device

Details Illumination measurement device Illumination measurement device

1978-01-16

1979-07-31

Hille, Rolf G.

Optics: measuring and testing

Photometers

Photoelectric

356229, 356256, G01J 110, G01J 142, G02B 2732

Patent

active

041628535

ABSTRACT:
A system and apparatus for providing a measure of ESI (equivalent sphere illumination) as a function of Lb (background luminance) and Lt (task luminance) and in which a pair of envelopes are provided each having a varying transmittance such that one envelope can provide an indication of the term (Lb-Lt) and the other an indication of Lb whereby ESI can be determined.

REFERENCES:
patent: 2651963 (1953-09-01), Bischoff
patent: 3416867 (1968-12-01), Biber
patent: 3591297 (1971-07-01), Hagner
patent: 3867036 (1975-02-01), Detwiler et al.
patent: 3912399 (1975-10-01), Griffith et al.
H. R. Blackwell, "Development of Procedures and Instruments for Visual Task Evaluation", Illuminating Engineering, Apr. 1970, pp. 267-291.
RQQ Report No. 4, Illuminating Engineering, vol. 65, Aug. 1970, pp. 504-510.
D. L. DiLaura, "On the Computation of Equivalent Sphere Illumination", Journal of IES, vol. 4, No. 2, Jan. 1975, pp. 129-149.

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