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High-sensitivity optical fiber quality detection sensor

An optical fiber and quality technology, applied in the direction of instruments, weighing, etc., can solve the problems of complex debugging, low sensitivity, and high cost

Active Publication Date: 2021-09-10
SHANDONG FIRST MEDICAL UNIV & SHANDONG ACADEMY OF MEDICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Optical fiber measurement has the characteristics of high precision, low loss, and high sensitivity. Optical fiber quality detectors on the market are often expensive, complicated to debug, poor in stability, and low in sensitivity.

Method used

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  • High-sensitivity optical fiber quality detection sensor
  • High-sensitivity optical fiber quality detection sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] See figure 1 , figure 1 It is a schematic structural diagram of a quality detection device provided by an embodiment of the present invention. It should be noted that, figure 1 It is a schematic diagram of the front view of the quality inspection device; each part is only for illustration, and its layout and shape cannot constitute a limitation on the structure of the quality inspection device in the embodiment of the present invention. Such as figure 1 As shown, the quality detection device includes: a first optical fiber 101 , a second optical fiber 102 , an elastic part 20 , a movable part 30 , an object stage 40 , and a substrate 50 . One end of the first optical fiber 101 is connected to the light source, and the other end is bonded to the movable part 30; one end of the second optical fiber 102 is connected to the spectrometer and the photodetector, and the other end is also bonded to the movable part 30; The fiber heads of the optical fiber 101 and the second ...

Embodiment 2

[0045] The difference from Embodiment 1 is that the movable part 30 in this embodiment is a frustum-shaped material strip whose diameter gradually increases. In this way, during the downward movement of the movable part 30, except that the refractive index of the material changes and affects the coupling effect between the first optical fiber 101 and the second optical fiber 102, the area of ​​the movable part 30, The change of the coupling effect between the first optical fiber 101 and the second optical fiber 102 is brought about by the change of the distance. In this way, multiple changes make the device more sensitive.

[0046]When measuring the mass of an object, when the optical path is connected, the object on the stage 40 will press the movable part 30 downward due to its gravity; The refractive index of the material of the active part 30 between the second optical fiber 102, and the area or distance of the active part 30 between the first optical fiber 101 and the se...

Embodiment 3

[0048] The technical difference from Embodiment 2 is that in this embodiment, a connecting portion 60 is provided between the first optical fiber 101 and the second optical fiber 102, the connecting portion 60 is attached to the movable portion 30, and the material of the connecting portion 60 is transparent flexible material.

[0049] In this way, during the moving process of the movable part 30, the shape of the connecting part 60 changes into a concave shape due to the increase of its diameter, so that the propagation state of the light in the connecting part 60 changes, and then changes The quality of the coupling between the first optical fiber 101 and the second optical fiber 102 is detected by measuring the transmission spectrum.

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Abstract

The invention discloses a quality detection device. The device comprises a first optical fiber, a second optical fiber, an elastic part, a movable part, an objective table and a substrate, under the condition that the light path is connected, an object on the objective table extrudes the movable part downwards due to the gravity of the object; the movable part moves downwards after being extruded, the refractive index of the material of the movable part in the position right opposite to an optical fiber head is changed, the coupling characteristic between the first optical fiber and the second optical fiber is changed, and a spectrograph and an optical detector measure the mass of the object. According to the invention, the refractive index between the two optical fibers and the coupling characteristic between the two optical fibers are changed through the change of gravity, the spectral measurement of the optical fibers is very accurate, and the transmission characteristic of the optical fibers is greatly influenced by the refractive index, so that the device is very accurate and sensitive.

Description

technical field [0001] The invention belongs to the field of quality detection, in particular to an optical fiber quality detection sensor. Background technique [0002] Quality inspection can be seen everywhere in life. In different industries and fields, there are different requirements for quality inspection. Most of the quality inspection instruments on the market are made based on electrical signals. These quality inspection instruments have low precision and weak adaptability. It is often necessary to match complex circuits to remove noise, process data, and improve accuracy. In addition, these mass detectors have low sensitivity and are not suitable for high-demand environments. [0003] Optical fiber, short for optical fiber, is a fiber made of glass or plastic that acts as a means of light transmission. The transmission principle is "total reflection of light". The tiny fiber is encapsulated in a plastic sheath that allows it to be bent without breaking. Typicall...

Claims

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Application Information

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IPC IPC(8): G01G9/00
CPCG01G9/00
Inventor 张素英
Owner SHANDONG FIRST MEDICAL UNIV & SHANDONG ACADEMY OF MEDICAL SCI