Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Fiber bragg grating hydrogen sensor based on femtosecond laser micromachining and preparation method for fiber bragg grating hydrogen sensor

A fiber grating and femtosecond laser technology, which is applied in laser welding equipment, metal processing equipment, clad optical fiber, etc., can solve the problems of low sensitivity and short film life, and achieve high sensitivity, low cost and improved film life.

Inactive Publication Date: 2013-06-26
WUHAN UNIV OF TECH
View PDF5 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a fiber grating hydrogen sensor based on femtosecond laser micromachining and its preparation method in order to overcome the technical defects of low sensitivity and short film life of the existing fiber grating hydrogen sensor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fiber bragg grating hydrogen sensor based on femtosecond laser micromachining and preparation method for fiber bragg grating hydrogen sensor
  • Fiber bragg grating hydrogen sensor based on femtosecond laser micromachining and preparation method for fiber bragg grating hydrogen sensor
  • Fiber bragg grating hydrogen sensor based on femtosecond laser micromachining and preparation method for fiber bragg grating hydrogen sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] Describe in detail below in conjunction with accompanying drawing:

[0030] Such as figure 1 As shown in the figure, as a pretreatment process for three-dimensional microstructure processing, a femtosecond laser is used to prepare irregularly distributed surface micropits. The femtosecond laser is focused by the laser focusing lens 1 , and the focus of the femtosecond laser beam 2 is aligned with the surface of the fiber grating (cladding) 3 . In order to avoid damaging the spectral characteristics of the core grating, the femtosecond laser beam is offset from the fiber core by 25-35um. The laser energy density is set in the interval slightly higher than the ablation threshold (critical vaporization point) of the quartz material. Let the optical fiber rotate at a constant speed under the drive of the rotating fixture, and at the same time, the worktable drives the optical fiber to move slowly along the axial direction, so that the laser scans the cladding cylindrical ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a fiber bragg grating hydrogen sensor based on femtosecond laser micromachining and a preparation method for the fiber bragg grating hydrogen sensor. The method comprises the following steps of: preparing a straight slot array or an intersected helical slot three-dimensional micro structure on a fiber bragg grating wrapping layer through femtosecond laser, and plating a palladium alloy film, wherein the sensitivity of the sensor is greatly improved, and the service life of a thin film is prolonged. The fiber bragg grating hydrogen sensor is characterized in that a femtosecond laser micromachining technology is introduced; by a clamp, irregular micro pits are obtained by quickly scanning the wrapping layer; and the three-dimensional micro structure is prepared inside the grating wrapping layer. After the fiber bragg grating with the micro structure is plated with the film, a hydrogen absorption surface area is enlarged, and the axial direction of an optical fiber is softened; the grating wavelength drift is greatly improved by hydrogen absorption expanding strain; and therefore, the measuring precision is improved, and the measuring range is expanded. By the grating wrapping layer plated film with the surface micro pits and the bent three-dimensional micro structure, the adhesive force of the thin film can be greatly improved, and the service life of the thin film is prolonged. The sensor has the advantages of high sensitivity, wide measuring range, long service life and the like, and is suitable for remote monitoring.

Description

technical field [0001] The invention relates to a fiber grating hydrogen sensor based on femtosecond laser micromachining and a preparation method thereof. Specifically, it is an optical fiber optical hydrogen sensor based on femtosecond laser processing optical fiber microstructure, and then coating a hydrogen sensitive film and a preparation method thereof. Background technique [0002] Since the advent of fiber grating sensors, the stability of long-term, real-time and on-line monitoring of fiber grating sensing technology has been widely recognized by experts. And with its unique advantages, it has been widely used in bridges, railways, highway tunnels, petrochemical and other industries, and has developed rapidly. So far, improving the accuracy and sensitivity of fiber grating sensors is mainly achieved by using elastic diaphragms of different materials and shapes, optimizing the structure, applying pre-tightening force, and improving the packaging process. [0003] T...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17B23K26/00G02B6/02
Inventor 戴玉堂杨明红周广福胡华东
Owner WUHAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com