Optical seat belt tension sensor

Details Optical seat belt tension sensor Optical seat belt tension sensor

2008-01-29

2008-01-29

Stafira, Michael P. (Department: 2886)

Optics: measuring and testing

Photometers

Reexamination Certificate

active

07324191

ABSTRACT:
A belt tension sensor includes an armature that is displaced in relation to belt tension and an optical sensing mechanism that detects armature displacement as a measure of belt tension. In a first mechanization, a lens element is mounted on the armature for movement therewith, and light emitted by a light source passes through the lens element before impinging on a light responsive element; the lens element variably diffuses the emitted light in relation to the belt tension, and the light impinging on the light responsive element provides a measure of the belt tension. In a second mechanization, the armature includes a protuberance that abuts and variably collapses a compressible optical waveguide to vary its optical transmissivity in relation to the armature displacement, and the optical transmissivity of the optical waveguide provides a measure of the belt tension.

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European Search Report dated Jul. 14, 2006.

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