Optical fiber temperature sensor based on bending loss

A technology of optical fiber temperature and bending loss, which is applied in the field of sensors, can solve the problems of complex optical signal detection devices, many coupling devices, and high production costs, and achieve the effects of light weight, small volume, and low cost

Inactive Publication Date: 2008-01-23
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

Common fiber optic temperature sensors include fiber grating temperature sensors, fiber optic temperature sensors based on fluorescence lifetime, interferometric fiber optic temperature sensors, distributed fiber optic temperature sensors, etc. Complex and cannot be widely used in production and research

Method used

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  • Optical fiber temperature sensor based on bending loss

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Experimental program
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Embodiment Construction

[0017] The structure of the present invention will be further described in detail by the given examples below.

[0018] Referring to Figure 1, select a multimode step-type optical fiber 3 with a core diameter of a=50um and a numerical aperture of NA=0.4; use optical fiber pliers to peel off the outer coating layer at both ends of the optical fiber; use an optical fiber cleaver to cut both ends of the optical fiber neatly plane; use FC-type bare fiber adapters (not shown in the figure) to fix the two ends of the optical fiber; select a glass rod 2 with a radius of 3.5 mm and a height of 1 mm for use; evenly coat a layer of UV curing on the surface of the clean glass rod 2 Glue, tightly wind the optical fiber several times on the glass rod 2 (in order to facilitate the observation, the optical fiber is sparsely arranged in the attached drawing), and irradiate the UV curing glue with an ultraviolet lamp to bond the glass rod and the optical fiber; connect the two ends of the optic...

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Abstract

The invention provides an optic-fiber temperature sensor that is for detecting ambient temperature and based on bend loss, which is wound on the outer diameter of a glass bar as a multi-mode optic fiber of a sensitive element. One end of the multi-mode optic fiber is connected with a light source, another end is connected with a light power meter. When the ambient temperature changes, the refractivity of the multi-mode optic fiber and the cladding will change; after bending, the local value aperture of the multi-mode optic fiber changes, hence the bend loss of the multi-mode optic fiber is changed. The temperature sensor is resistant to electromagnetic disturbance, of high measuring sensibility, wide operation frequency band, simple structure, low cost and wide application field.

Description

technical field [0001] The invention relates to a sensor in the technical field of optical fiber sensing, in particular to an optical fiber sensor which uses optical fiber bending loss to measure ambient temperature. Background technique [0002] In many fields of engineering technology and scientific research, the ambient temperature must be monitored. With the advancement of technology and productivity, the requirements for measurement accuracy continue to increase. Traditional temperature measurement methods are mainly realized by temperature sensing elements such as thermocouples, thermal resistors, and semiconductor temperature sensors. They are limited in low sensitivity, poor anti-electromagnetic interference ability, and narrow application frequency band. [0003] Compared with traditional temperature sensors, optical fiber temperature sensors have the advantages of anti-electromagnetic interference and high sensitivity. Common fiber optic temperature sensors includ...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01D5/353G02B6/26G02B6/36
Inventor 鄂书林周广丽邓文渊
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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