Illuminance measurement of vehicle lamp

Details Illuminance measurement of vehicle lamp Illuminance measurement of vehicle lamp

1994-01-04

1995-06-20

Pham, Hoa Q.

Optics: measuring and testing

Photometers

Photoelectric

356121, 33288, G01J 142

Patent

active

054265002

ABSTRACT:
In the method for measuring the illuminance of a vehicle lamp according to the present invention, an image of the light emitted from a headlamp and projected onto a screen is picked up for every pixel, by an imaging device, to detect a gradient of each pixel; an illuminance of the light incident upon illuminance sensors disposed in predetermined positions correspondingly to the screen is detected by each of the illuminance sensors; a function or correlation diagram showing the relationship between the illuminances and gradients is generated based on the gradients corresponding to as many illuminances thus obtained as the illuminance sensors; and the function or correlation diagram is used to detect the illuminance at a position on the screen, the position corresponding to the desired pixel.

REFERENCES:
patent: 2977843 (1961-04-01), Graeber et al.
patent: 3532432 (1970-10-01), Mansour
patent: 3802785 (1974-04-01), Hankins et al.
patent: 4120589 (1978-10-01), Mima et al.
patent: 4647195 (1987-03-01), Ishikawa et al.
patent: 4948249 (1990-08-01), Hopkins et al.
patent: 5170220 (1992-12-01), Matsumoto et al.

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