Optical fiber sensor for temperature measurement

Abstract

The invention discloses an optical fiber sensor for temperature measurement. The optical fiber sensor is characterized by comprising an optical fiber beam (20), wherein the optical fiber beam (20) comprises a plurality of unit optical fibers (22), an oxidation-resistance metal coating is coated on the surface of one end of each unit optical fiber (22), the ends, with the oxidation-resistance metal coating, of all unit optical fibers (22) are gathered for forming a probe (24), the other ends of all unit optical fibers (22) form two strands of branch optical fiber beams (a and b), the two strands of branch optical fiber beams (a and b) are respectively connected with a filtering plate (26), and the filtering plate (26) is connected with a photoelectric detector (28). The probe of the optical fiber sensor is directly formed at one ends of the optical fiber beams, in addition, through the composition structure, the errors caused by heat expansion and cold contraction effects can be eliminated, the temperature sensing area of the optical fiber is further increased, and the signal picking capability is greatly enhanced. Meanwhile, the optical fiber sensor has the advantages that the structure is stable and reliable, the size is small, the cost is low, and the measuring precision is high.

Description

technical field [0001] The invention relates to an optical fiber sensor, in particular to an optical fiber sensor for temperature measurement. Background technique [0002] At present, in scientific research and practical industrial applications, higher requirements are put forward for the measurement accuracy and stability of various measurement methods or measurement devices. kind of deficiency. For example, when thermocouples are used to measure temperature, there will be defects and problems such as complex signal conditioning, low precision, and susceptibility to corrosion. [0003] The basic working principle of the optical fiber sensor is to send the light from the light source to the modulator through the optical fiber, so that after the parameter to be measured interacts with the light entering the modulation area, the optical properties of the light (such as light intensity, wavelength, frequency, phase, etc.) , skewed normal state, etc.) changes to become the mo...

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Problems solved by technology

However, in the long-term use, it is found that the device still has the following disadvantages: (1) Because the black body cavity probe uses gemstones, the cost is expensive; (2) The carrier for transmitting optical signals includes high-temperature optical fibers and light-transmitting optical fibers, and the coupling point of the two It will cause a waste of energy; (3) Due to the application of the beam splitter, the structure of the entire sensing device becomes complicated, and it cannot be applied to places with harsh environments; (4) The dark current of the detection signal will make the subsequent processing system complex and costly. Becomes high

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