Device for optically measuring the shading of translucent panes

Details Device for optically measuring the shading of translucent panes Device for optically measuring the shading of translucent panes

1988-07-26

1989-09-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356222, H01J 4014

Patent

active

048702641

ABSTRACT:
A device for measuring the shading of a translucent pane having an exterior side and an interior side comprising first and second photoelectric sensors for measuring unattenuated daylight, each of the sensors having a photosensitive surface and a spectral sensitivity substantially corresponding to the spectral sensitivity of the human eye and generating an output signal proportional to the intensity of the measured daylight, a first mounting element for mounting the first sensor on the exterior surface with the photosensitive surface of the first sensor facing away from the exterior surface, a second mounting element for mounting the second sensor on the interior surface with the photosensitive surface of the second sensor facing the interior surface, a housing, and an electronic circuit disposed in the housing and electrically connected to the first and second sensors for calculating the difference of the output signals of the first and second sensors, calculating the ratio of the difference to the signal from the first sensor, and displaying the ratio as a reference value.

REFERENCES:
patent: 3941487 (1976-03-01), Ehret et al.
patent: 3989948 (1976-11-01), Allington
patent: 4037972 (1977-07-01), Pross
patent: 4236826 (1980-12-01), Yamanishi

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