Measuring light intensity variations

Details Measuring light intensity variations Measuring light intensity variations

G - Physics

01

J

73/53

G01J 1/42 (2006.01) A61B 3/113 (2006.01) G05D 25/02 (2006.01)

Patent

CA 1315119

Abstract The invention relates to measurements of light, where light variations superimposed on a background amount of light, which is changing relatively slowly, are measured. To give the light sensitive element (3,3') used a stable operational point a light emitting element (5,5') is used for injecting extra light into the light sensitive element (3,3'). Thus, the amount of light injected by this light emitting element (5,5') is chosen in such a way that the sum of the ambient light and the injected light is substantially constant. To this amount of light are added the light variations, e.g. caused by a second light emitting element (9,9'). This process and device can be used in a device for measuring the eye movements of a person.

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