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Optical fiber rotary connector based on doublet lens and application thereof

A technology of rotating connector and doublet lens, applied in instruments, optics, light guides, etc., can solve the problems of insufficient coupling efficiency, large loss, and difficult bidirectional transmission of single-mode fiber collimator signals.

Active Publication Date: 2021-09-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the existing fiber optic rotary connectors, the coupling efficiency is not high enough, the application of the fiber grating sensor system has too much input loss, and it is difficult to use a single-mode fiber collimator to achieve bidirectional signal transmission.

Method used

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  • Optical fiber rotary connector based on doublet lens and application thereof
  • Optical fiber rotary connector based on doublet lens and application thereof
  • Optical fiber rotary connector based on doublet lens and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a fiber optic rotary connector based on a doublet lens includes a stator housing and a rotor housing, the rotor housing 12 is provided with a rotor sleeve 13, the rotor sleeve 13 is fixed in a bearing group 15, and the rotor sleeve 13 The tail end is provided with FC / APC connector 28, and FC / APC connector 28 is connected with rotor optical fiber jumper 29, and rotating shaft 10 is inserted in described rotor housing 12, and rotating shaft 10 is connected to the outside of rotor sleeve 13 tail, makes rotor sleeve The cylinder 13 rotates; the rotor sleeve 13 internally fixes the rotor limiting groove 27, and the rotor limiting groove 27 fixes the rotor doublet lens 26 in the rotor sleeve 13, and the end surface of the rotor sleeve 13 close to the stator shell is pasted with a reflective material forming a reflective surface 16;

[0034] The stator housing 19 is provided with a stator limiting groove 25, which fixes the stator doublet lens 24 in...

Embodiment 2

[0053] In the application of the optical fiber rotary connector as a speed sensor, the light output by the light source enters the self-focusing lens 18 through the speed measuring optical fiber 20, and the light is transmitted to the reflective surface 16 after being collimated. After being reflected by the reflective material on the reflective surface 16, Going back to the self-focusing lens 18, the self-focusing lens receives and couples back to the rotational speed measuring fiber 20, and the photoelectric counter calculates the rotational speed according to the number of times the reflected light transmitted by the rotational speed measuring fiber is received. Calculate the rotational speed according to the formula:

[0054]

[0055] Among them, Z is the number of reflective materials on the reflective surface, and f is the number of times the photoelectric counter receives reflected light per second.

Embodiment 3

[0057] Fiber optic rotary connectors are used to prepare fiber grating sensing systems such as figure 2 As shown, the stator end of the optical fiber rotary connector 2 is provided with a broadband light source 4, a first optical fiber circulator 3, a second optical fiber circulator 7, a fiber coupler 6, a fiber grating demodulator 5, a photoelectric counter 8 and a computer 9, The rotor end of the optical fiber rotary connector 2 is provided with a fiber grating sensor 1, and the broadband light source 4 outputs a wide-wavelength light, which passes through the first optical fiber circulator 3 to the optical fiber coupler 6, and the optical signal is divided into two optical paths Arriving at the optical fiber rotary connector, the thermally expanded core fiber jumper 22 in the optical path 1 transmits light from the stator end to the rotor end. After the fiber grating sensor 1 completes the measurement, it reflects the optical signal of a specific wavelength and transmits it...

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Abstract

The invention discloses an optical fiber rotary connector based on a doublet lens and application thereof, the optical fiber rotary connector comprises a rotor, a stator and a central light transmission channel, and the rotor and the stator both adopt the same thermal expansion core single-mode optical fiber and the doublet lens (a positive lens and a negative lens). Light is emitted from the stator optical fiber and is subjected to beam expansion and collimation through the stator doublet lens, the collimated light is transmitted in air and is gathered by the rotor doublet lens, the light is coupled into the rotor optical fiber, and the light is reflected by the sensing grating and returns to the stator optical fiber through the optical fiber rotary connector. The optical element and the optical path reversible principle are combined, transmission of optical signals from the rotating end to the static end is achieved, two-way transmission of the optical signals is achieved, and therefore the optical fiber grating sensing system is adapted, the structure is simple, cost is low, coupling efficiency is high, reliability is high, and the service life is long.

Description

technical field [0001] The invention relates to the field of optical fiber rotary connectors, in particular to an optical fiber rotary connector based on a doublet lens and an application thereof. Background technique [0002] When measuring parameters such as temperature and stress of rotating parts, it is necessary to transmit the signal of the sensor from the rotating end to the stationary end. The application of optical fiber rotary connectors to fiber grating sensing systems is a high-quality technical solution. At present, the coupling efficiency of the optical fiber rotary connector is not high enough, and the loss is large when it is used for fiber grating sensing. [0003] The Chinese patent with the application number 200920102521.2 discloses a single-channel fiber optic rotary connector, which uses a thermally expanded core fiber for direct alignment and coupling, without the use of a collimator, and the output beam of the fiber diverges, and the coupling efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/38
CPCG02B6/3807G02B6/3853G02B6/3833
Inventor 赵振刚段绍锋罗川何琦李英娜张家洪张大骋王思飞
Owner KUNMING UNIV OF SCI & TECH
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