Displacement detector device and method
First Claim
1. A chest belt for detecting respiration, comprising:
- a buckle having first and second parts relatively movable with respect to each other along an axis of movement;
a spring yieldable retaining the two buckle parts in an initial position;
one of said buckle parts carrying an optical fibre having a planar light-emitting face oriented parallel to the axis of movement of the two buckle parts;
the other of said buckle parts carrying a mirror having a planar reflecting surface adjacent to, parallel to, and partially overlapping said light-emitting face of the optical fibre in said initial position of the two buckle parts;
a light source for introducing light into said optical fibre;
and a light sensor for sensing the light reflected by said reflecting surface of the mirror back to the light-emitting face of the optical fibre and for outputting an electrical signal corresponding thereto.
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Abstract
A device for detecting displacement of an object, particularly a chest belt for detecting respiration, includes an optical fibre having a light source at one end and a light-emitting face at the opposite end, a reflector device adjacent to and partially overlapping the light-emitting face of the optical fibre and movable with respect thereto to increase or decrease the amount of overlapping, a coupling for coupling the reflecting device to the object whose displacement is being detected, and a light sensor for sensing the amount of light reflected by the reflector back to the light-emitting face of the optical fibre and for outputting an electrical signal corresponding thereto.
51 Citations
7 Claims
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1. A chest belt for detecting respiration, comprising:
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a buckle having first and second parts relatively movable with respect to each other along an axis of movement; a spring yieldable retaining the two buckle parts in an initial position; one of said buckle parts carrying an optical fibre having a planar light-emitting face oriented parallel to the axis of movement of the two buckle parts; the other of said buckle parts carrying a mirror having a planar reflecting surface adjacent to, parallel to, and partially overlapping said light-emitting face of the optical fibre in said initial position of the two buckle parts; a light source for introducing light into said optical fibre; and a light sensor for sensing the light reflected by said reflecting surface of the mirror back to the light-emitting face of the optical fibre and for outputting an electrical signal corresponding thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification