Temperature measuring device based on tunable light source and fiber bragg grating

Abstract

The invention discloses a temperature measuring device based on a tunable light source and a fiber bragg grating. The temperature measuring device comprises an optical module, a fiber bragg grating sensor array and the like. The fiber bragg grating sensor array is connected to the optical module, the optical module is connected with a light source driving module, and the light source driving module is connected with a data acquisition and processing module. The collected and processed signals are sent to a demodulation module for algorithm demodulation, the temperature information after the demodulation is sent to an interface communication module through the data acquisition and processing module and transmitted to an upper computer through an RS-422 to display a measured temperature value in real time. The temperature measuring device is based on a tunable light source principle and has the advantages that the overall temperature measuring device is small in size, high in integration, simple in light path connection and high in reliability, a measuring sensor device is a passive device, and the temperature information of measured points can be transmitted over long distances by optical fibers and integrated with multiple sensors by one fiber; and the temperature measuring device can be applied to different measuring occasions and can avoid the defects of poor anti-electromagnetic interference ability in traditional electrical temperature measurement and the like, the implementation method is flexible and fast, and the universality is high.

Description

technical field [0001] The invention relates to a temperature measuring device and belongs to the technical field of optical fiber sensing equipment. Background technique [0002] As a new generation product of temperature measurement, the fiber grating system has the quasi-distributed advantages of wide measurement range and high density. The quasi-distributed fiber grating temperature measurement sensor system can continuously and real-time measure the temperature of various points along the optical fiber within tens of meters to several kilometers, and the interval can reach centimeters. It is flexible in layout and light in weight. It is very suitable for large precision structures Range multi-point temperature measurement occasions. At present, fiber grating sensing has a wide range of applications in engineering structure monitoring, electric power, petrochemical, ocean, nuclear energy, medicine and other fields. [0003] In the fiber grating temperature measurement ...

AI Technical Summary

Problems solved by technology

In actual engineering use, the internal optical path of traditional measurement equipment is complicated, and there are many related optical components. Many core components are imported from abroad, which is expensive, which is not conducive to the promotion of fiber grating sensing in the market.

Tunable light sources have mature applications in communication before, but their tunable range is narrow, which cannot meet the requirements of large-scale scanning of fiber grating sensors

Images