Optical fiber temperature sensor based on light intensity modulation principle

Abstract

The invention discloses an optical fiber temperature sensor based on a light intensity modulation principle. The optical fiber temperature sensor is characterized by comprising a protecting tube (10), a temperature sensing block (1), a slide block (4), an elastic element (5) and an optical fiber probe (7), wherein the temperature sensing block (1) is arranged in the protecting tube (10) and can expand or contract in one direction in the protecting tube (10), the slide block (4) is arranged in the protecting tube (10) and can move along with the expansion or contraction of the temperature sensing block (1), one end of the elastic element (5) is fixedly connected with the slide block (4), the other end of the elastic element (5) is connected with a baffle plate (6) fixedly arranged in the protecting tube (10), the optical fiber probe (7) is arranged in the protecting tube (10) and is in interval arrangement with the slide block (4), and an incident optical fiber (8) and an emergent optical fiber (9) are arranged on the optical fiber probe (7). The optical fiber temperature sensor has the advantages that the structure is simple, the performance is stable, the use cost is lower, and in addition, the optical fiber temperature sensor can be used for contact type temperature measurement and noncontact type temperature measurement and cannot be influenced by the environment.

Description

technical field [0001] The invention relates to a temperature sensor, in particular to an optical fiber temperature sensor based on the light intensity modulation principle. Background technique [0002] As we all know, the monitoring of temperature parameters in the industrial production process is often directly related to the quality of the product. At present, the most used temperature parameter monitoring methods include thermocouple temperature measurement, infrared temperature measurement and colorimetric temperature measurement, etc. Among them, the thermocouple temperature measurement has the defects and problems of slow response speed and complicated operation of installing the protection tube; the optical fiber probe used in the infrared temperature measurement needs to use high temperature resistant gemstones and process them into black cavity, so the cost of materials and processing is relatively high. High, resulting in the defects and problems of high cost of...

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Problems solved by technology

Among them, the thermocouple temperature measurement has the defects and problems of slow response speed and complicated operation of installing the protection tube; the optical fiber probe used in the infrared temperature measurement needs to use high temperature resistant gemstones and process them into black cavity, so the cost of materials and processing is relatively high. High, resulting in the defects and problems of high cost of use in infrared temperature measurement; while colorimetric temperature measurement requires the application of optical materials such as optical filters, so the complexity of the system is greatly increased

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