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Fiber Bragg Grating Demodulation System Using Imaging Mirror to Improve Spectral Resolution

A technology of fiber grating demodulation and imaging mirror, which is applied in the direction of transmitting sensing components, converting sensor output, and measuring devices with optical devices, and can solve problems such as limited number of pixels and limited spectral spatial resolution

Active Publication Date: 2018-03-30
BEIJING INFORMATION SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the spectral spatial resolution is limited due to the limited number of pixels in the line array image sensor

Method used

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  • Fiber Bragg Grating Demodulation System Using Imaging Mirror to Improve Spectral Resolution
  • Fiber Bragg Grating Demodulation System Using Imaging Mirror to Improve Spectral Resolution
  • Fiber Bragg Grating Demodulation System Using Imaging Mirror to Improve Spectral Resolution

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Effect test

Embodiment 1

[0044] figure 2 A schematic diagram of the structure of a fiber grating demodulation system that uses slit translation to improve the spectral resolution of a line array image sensor is schematically shown. Such as figure 2 As shown, the slit 105 is adjusted so that the slit moves in the direction of the arrow b shown in the figure, the slit moving step is 0.1 micron, and the adjustment range is between 0-1 cm. The slit 105 is adjusted at high speed by a piezoelectric actuator. The piezoelectric actuator is controlled by a voltage control system, so that the spectral imaging position on the line image sensor can be moved within the minimum pixel interval. In this way, the light path incident on the imaging mirror 108 will change, and the fringes converged on the line array detector 109 will also change accordingly. By adjusting the width of the incident slit of the optical fiber, the slight movement of the stripes can be realized, thereby achieving the effect of improving...

Embodiment 2

[0046] image 3 A schematic structural diagram of a fiber grating demodulation system that improves the spectral resolution of a detector array by fine-tuning a collimator mirror is schematically shown. Such as image 3 As shown, the collimating mirror 106 is adjusted so that the collimating mirror rotates in the direction of arrow c in the figure, and the rotation angle is 10°-30° counterclockwise or clockwise. The collimating mirror 106 is adjusted at high speed by piezoelectric actuators. The piezoelectric actuator is controlled by a voltage control system, so that the spectral imaging position on the line image sensor can be moved within the minimum pixel interval. In this way, the light path incident on the imaging mirror 108 will change, and the fringes converged on the line array detector 109 will also change accordingly. By adjusting the rotation angle of the collimating mirror, the slight movement of the stripes can be realized, thereby achieving the effect of impr...

Embodiment 3

[0048] Figure 4 A schematic structural diagram of a fiber grating demodulation system that uses a micro-movable grating to improve the spectral resolution of a detector array is schematically shown. Such as Figure 4 As shown, the spectroscopic grating 107 is adjusted so that the spectroscopic grating rotates in the direction of the arrow d in the figure, and the rotation angle is 10°-30° counterclockwise or clockwise. The split grating 107 is adjusted at high speed by piezoelectric actuators. The piezoelectric actuator is controlled by a voltage control system, so that the spectral imaging position on the line image sensor can be moved within the minimum pixel interval. In this way, the light path incident on the imaging mirror 108 will change, and the fringes converged on the line array detector 109 will also change accordingly. By adjusting the rotation angle of the spectroscopic grating, the slight movement of the fringe can be realized, thereby achieving the effect of...

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Abstract

The invention provides a fiber grating demodulation system utilizing fine tuning of an imaging lens to improve spectrum resolution. The demodulation system comprises a pumping source, a wavelength division multiplexing device, a Bragg fiber grating, a diaphragm, a slit, a collimating mirror, a light splitting grating, the imaging lens, a linear array detector, a piezoelectric execution element and a voltage control system, wherein the pumping source, the wavelength division multiplexing device and the Bragg fiber grating are connected in sequence, the wavelength division multiplexing device is simultaneously connected with the diaphragm, light emitted by the pumping source enters the Bragg fiber grating after the coupling of the wavelength division multiplexing device, a reflection spectrum of the Bragg fiber grating serves as injection light and enters the fiber grating demodulation system, and after the injection light passes through the slit, the injection light is reflected by the collimating mirror, the light splitting grating and the imaging lens in sequence and is finally gathered to the linear array detector. The imaging lens is capable of rotating anticlockwise or clockwise by a small angle.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an optical fiber grating demodulation system and method for improving spectral resolution by fine-tuning an imaging mirror. Background technique [0002] Fiber Bragg Grating is a new type of passive sensing element, which has many advantages such as high sensitivity, strong anti-electromagnetic interference, and corrosion resistance. Since it is used in sensing, it has achieved rapid and sustainable development. It has broad application prospects in security monitoring in other fields. Fiber Bragg grating demodulation system is the key part of the whole sensing system, realizing high precision, high resolution, combination of dynamic and static parameters, multi-point multiplexing detection and low cost is the development trend of fiber Bragg grating demodulation technology. There are many methods of optical fiber demodulation. The tuned F-P filter method can only be used to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
CPCG01D5/35316
Inventor 祝连庆何巍娄小平刘锋骆飞庄炜
Owner BEIJING INFORMATION SCI & TECH UNIV
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