Optical fiber temperature sensor

Abstract

The invention discloses an optical fiber temperature sensor based on fluorescence intensity detection. The optical fiber temperature sensor comprises an optical fiber pump light source, a single-mode optical fiber, an optical fiber coupler, a photoelectric detector and a special doped optical fiber, wherein the pump light source is used for generating exciting light and transmitting emitted pump laser to the special doped optical fiber end through the optical fiber coupler and the single-mode optical fiber; the special optical fiber is used as a sensing end and generates a fluorescence signal with a longer wave band under the excitation of the pumping laser; and the fluorescence signal can be directly received by the photoelectric detector along the transmission direction, can also be transmitted along the reverse direction, and is received by the photoelectric detector through the single-mode optical fiber and the optical fiber coupler, so that the intensity detection of the fluorescence signal is realized. The stimulated radiation light intensity of the special optical fiber is weakened along with the rise of the environment temperature, and the manufacturing of the optical fiber temperature sensor is realized based on the principle. The device can realize high temperature measurement, is fast in system temperature response, and has a wide application prospect in the fields of transient temperature detection in an explosion environment, extreme environment temperature monitoring in fire engineering and the like.

Description

technical field [0001] The implementation of the present invention relates to the technical field of high temperature temperature sensing, in particular to an optical fiber temperature sensor. [0002] technical background [0003] With the continuous development of information technology and the transformation and upgrading of traditional industrial clusters, new requirements have been put forward for high-temperature and instantaneous measurement technology, especially in the fields of deep-sea mine temperature monitoring, metallurgical industry, fire-fighting structural engineering, etc., the relationship between accurate temperature measurement and control For important aspects such as production efficiency, product quality and production safety, fast, accurate and reliable temperature measurement technology is particularly important. [0004] Traditional temperature sensing equipment based on electrical signals has weak anti-electromagnetic interference and corrosion res...

AI Technical Summary

Problems solved by technology

[0005] At present, the relatively mature optical fiber temperature sensors can be divided into light intensity modulation type and phase modulation type according to different temperature detection principles. Among them, the phase modulation type optical fiber temperature sensor realizes sensing test by processing microstructure in the optical fiber, and is affected by the optical fiber sensing probe material. and structural stability, it is difficult to realize remote temperature monitoring in extreme temperature environments, and there are certain limitations in transient temperature detection

Images