Fiber optics condition sensor and method of making same

Details Fiber optics condition sensor and method of making same Fiber optics condition sensor and method of making same

G - Physics

01

D

26/197, 73/58

G01D 5/26 (2006.01) G01K 5/62 (2006.01) G01K 5/70 (2006.01) G01L 7/08 (2006.01) G01L 9/00 (2006.01)

Patent

CA 1227062

FIBER OPTICS CONDITION SENSOR AND METHOD OF MAKING SAME ABSTRACT OF THE DISCLOSURE A fiber optics condition sensor and a method of producing such a device is disclosed. A bundle of opti- cal fibers provides a planar termination on one end and is bifurcated to provide one group adapted to be con- nected to a light source and another group adapted to be connected to a detector. A shallow, curved, thin metal- lic diaphragm provides a central portion movable toward and away from the termination in response to the condi- tion being sensed in order to vary the light reflected to the detector and therefore produce a detector output signal which is a function of the changes in conditions being sensed. The diaphragm may be formed of bimetal for sensing temperature conditions, or of a homogeneous metal to sense pressure. The curvature formed in the diaphragm is selected to provide movement of the central portion of the diaphragm through a distance selected to match the reflective light intensity versus spacing curve so the the system provides substantially the maximum response over a predetermined range of conditions being sensed. variations in the curvature of the diaphragm are compen- sated for in the mounting of the diaphragm with respect to the fiber optics termination so as to ensure maximum response in the total system.

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