Self measuring illumination device

Details Self measuring illumination device Self measuring illumination device

1985-09-16

1987-03-31

Laroche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250228, 362362, H01J 516

Patent

active

046545212

ABSTRACT:
An illumination device is disclosed which includes a lamp for producing light. Light from the lamp enters the input end of a cuboidal integrating bar formed of material having a refractive index greater than .sqroot.2. The edges of the output end of the bar are rendered imperfect by blunting. Light escaping the bar, other than through the output end of the bar, by virtue of the imperfections, is detected by a photosensitive device in a space within a housing around the bar. The housing has inlet and outlet apertures such that light cannot enter the space in the housing other than through the bar. The imperfections are masked so that light cannot enter the bar through the imperfections. The photosensitive device produces a signal indicative of the useful light output of the bar, which signal is not influenced by light entering the output end of the bar.

REFERENCES:
patent: 2506672 (1950-05-01), Kell et al.
patent: 3163080 (1964-12-01), Miller
patent: 3222522 (1965-12-01), Birkebale
patent: 3949226 (1976-04-01), Dugan et al.
patent: 3982123 (1976-09-01), Goell et al.
patent: 4103154 (1978-07-01), d'Auria et al.

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