Method for real-time measurement of multipoint temperatures based on fluorescence optical fiber temperature sensor

Abstract

The invention discloses a method for real-time measurement of multipoint temperatures based on a fluorescence optical fiber temperature sensor, and belongs to the field of temperature sensors. The method is characterized in that: an excitation light source module is subjected to intensity modulation, thus the excitation light source module outputs the excitation light which has the light intensity comprising N frequency components and excites the fluorescent substances in Q channel optical fiber probes; and a phase lock detection technique is adopted to carry out demodulation on the collectedfluorescence signals through K groups of data obtained by phase shift so as to obtain the fluorescence lifetime of each measurement point, and the temperatures of the corresponding points are furtherobtained. According to the method disclosed by the invention, multi-point measurement can be realized only by adopting a single excitation light source and a signal detecting and processing module, and the advantages of simple and compact structure, low system cost and capability of real-time positioned measurement of multipoint temperatures can be realized.

Description

technical field [0001] The invention belongs to the field of temperature sensors, in particular to a method for measuring multi-point temperatures in real time based on a fluorescent optical fiber temperature sensor. Background technique [0002] Compared with traditional temperature sensors, optical fiber temperature sensors have many advantages, such as: light waves are not affected by electromagnetic interference; optical fiber has a wide operating frequency and a large dynamic range, and is a low-loss transmission line; the optical fiber itself is uncharged, small in size and light in weight , easy to bend, good radiation resistance. Therefore, the fiber optic temperature sensor is especially suitable for use in harsh environments such as flammable, explosive, strictly limited space, and strong electromagnetic interference, which solves the problem of temperature measurement that cannot be solved by traditional methods. Among them, the fluorescent optical fiber temperat...

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Problems solved by technology

However, the disadvantages of this method are: on the one hand, the complex dynamic coupling device introduces dynamic coupling errors, which affects the stability of temperature measurement;

[0005] In addition, multi-point temperature measurement can also be realized by referring to the time-division multiplexing method in optical fiber communication, but this method requires the use of multiple excitation light sources and a precise time synchronization system, and the system is complex and expensive

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