Method for sensing temperature, pressure and liquid level, and variable ratio fiber optic coupler sensors therefor

• Main Author: GERDT, DAVID W
• Format: Patent
• Language: English; French; German
• Published: 14.08.1991
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TARIFF METERING APPARATUS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

Method of sensing a parameter in a hazardous environment uses a fiber optic coupler sensor having a plurality of input optical fibers (13,16) and a plurality of output optical fibers (14), the cores of the fibres being fused in a waist region which is encapsulated in a material (11) having a refract...