Wavelength division multiplexing dual-wavelength fiber delaying temperature sensor

Abstract

The invention discloses a wavelength division multiplexing dual-wavelength fiber delaying temperature sensor, belongs to the technical field of fiber temperature sensors, and solves the problems of complex structure, high cost and low transmission relative time delay efficiency of optical signals in the prior art. The wavelength division multiplexing dual-wavelength fiber delaying temperature sensor comprises a dual-wavelength light emitting module, a wavelength division multiplexing device, a light reception module, a signal processing and control module, a transmission fiber and a sensing fiber. Wavelength division multiplexing dual wavelength optical path design is employed, and the temperature is determined by measuring the relative time delay of dual-wavelength optical signals. The sensing fiber employs a common quartz (SiO2) fiber, and the measured temperature scope is increased. The temperature sensor has the advantages of simple structure, low cost and easy promotion and application.

Description

technical field [0001] A wavelength division multiplexing dual-wavelength optical fiber delay temperature sensor, which is used to measure the delay time of wavelengths to obtain the sensing temperature. The invention relates to the technical field of optical fiber temperature sensing, in particular to a dual-wavelength optical fiber based on wavelength division multiplexing technology Delay temperature sensor. Background technique [0002] Optical fiber temperature sensors have the advantages of safety, light weight, accuracy, and anti-electromagnetic interference. They are widely used in temperature detection systems for power equipment, hydropower equipment, and tunnel fire protection, and are also used in various aspects of industrial and civil temperature measurement that require temperature measurement. [0003] Generally, the technical methods used by fiber optic temperature sensors are: ①The temperature will cause the change of the fiber grating constant, and then ch...

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Problems solved by technology

[0006] The present invention provides a wavelength division multiplexing dual-wavelength optical fiber delay temperature sensor for the above disadvantages, which solves the problem that the optical path in the prior art is complex and not concise enough; the insertion loss of the optical path is large, the cost is high, and the relative delay time of optical signal transmission The problem of inefficiency

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