FIBER OPTICAL THERMOMETER Russian patent published in 2018 - IPC G01K11/32 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the measurement of temperature in areas with strong electromagnetic interference, in areas of high explosive and fire hazard, when measuring under high voltage and in other conditions where it is inadmissible to use standard electronic means for monitoring the temperature state, namely to systems for monitoring the temperature state in medicine, at power supply facilities, engineering facilities. Claimed fiber optic thermometer comprises an optical coupler, a circulator, an optical filter, N-1 optical fiber splitters connected in series by optical fibers, N-1 optical sensors, N optical combiners connected in series by optical fibers, where N is a natural number and N≥1. First output of each previous one of the N optical couplers is connected to the input of each subsequent corresponding of N optical couplers, the second output of each optical splitter connected from the N-1 is connected to the input of a corresponding optical sensor from the N-1 through an optical fiber. Output of each of the N optical sensors is connected to the second input of a corresponding N optical combiner through an optical fiber, wherein the first input of each previous one of the N optical combiner is connected to the output of each subsequent corresponding of the N optical combiner. Output of the first N optical combiner is connected to the input of the optical coupler through a fiber light guide. First output of the optical coupler is connected to the input of the first photodetector through a fiber light guide, and the second output of the optical coupler is connected to the circulator input through a fiber light guide. First output of the circulator is connected to the optical filter by means of an optical fiber, the second output of the circulator is connected to the input of the second photodetector through an optical fiber, and the outputs of the first and second photodetectors are connected to the first and second inputs of the temperature controller, respectively, through electrical wires. Laser radiation source is made broadband, and each optical sensor is based on a Bragg fiber grating with two phase shifts.

EFFECT: simplification of a fiber-optic thermometer circuit.

3 cl, 4 dwg