Unlock instant, AI-driven research and patent intelligence for your innovation.

A Fiber Bragg Grating Three-Dimensional Vector Vibration Sensor

A vibration sensor and three-dimensional vector technology, which is applied to instruments, measuring devices, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of sensors that cannot be used normally, reduce impact resistance, and unstable elastic properties, etc., to achieve three-dimensional vibration signals Detecting and enhancing the effect of impact resistance

Inactive Publication Date: 2018-12-14
XI'AN PETROLEUM UNIVERSITY
View PDF9 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, this scheme is realized based on the bellows structure. Due to the complex manufacturing process of the bellows itself and the unstable elastic performance, the repeatability of the sensor is poor; secondly, this scheme is based on the two-point packaging method to place the fiber Bragg The grating is packaged on the elastic bellows. Because the two-point package will cause the vibration state of the grating itself to be more complicated, a relatively large prestress must be applied to eliminate the influence of its own vibration state, which increases the difficulty of packaging and reduces the practicability. Due to the two-point packaging of the grating, the grating is exposed, which reduces the impact resistance, causes the sensor to fail, and greatly reduces the practicability
These factors are likely to cause measurement signal distortion or sensor failure, which eventually leads to the failure of the sensor to work normally.

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
  • A Fiber Bragg Grating Three-Dimensional Vector Vibration Sensor
  • A Fiber Bragg Grating Three-Dimensional Vector Vibration Sensor
  • A Fiber Bragg Grating Three-Dimensional Vector Vibration Sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] see figure 1 As shown, the optical fiber Bragg grating vector vibration sensor is a hollow sensitive cylinder structure, mainly composed of an optical fiber outlet 1, a hollow sensitive cylinder 2, a sensing grating 3, a base fixing screw hole 4, a fixing base 5, a sensing grating 6, The sensing grating 7 and the inertial mass block 8 are connected. The inertial mass 8 is located above the hollow sensitive cylinder, the central axis of the inertial mass coincides with the central axis of the hollow sensitive cylinder, and is fixed on the hollow sensitive cylinder or connected as a whole, sealed and welded or glued and fixed, The lower end of the hollow sensitive cylinder and the upper end of the fixed base 5 are fixed and connected in parallel as a whole, sealed and welded or glued and fixed, the center of the inertial mass 8 is provided with an optical fiber hole 1, and the ends are sealed and welded or glued and fixed, and the sensor grating 3. Sensing grating 6 and ...

Embodiment 2

[0026] In this embodiment, the structural parameters and materials of the sensor are the same as in Embodiment 1, the difference is that the positions of the sensing gratings 3, 6, and 7 move clockwise by 30 degrees, and the gratings are still parallel to the axis of the sensitive cylinder, and are relatively clamped The angle is still 120°. The central wavelength of the sensing grating 3 is 1548.615nm, the 3dB bandwidth is 0.291nm, the geometric length of the fiber grating is 6mm, the reflectivity of the grating is greater than 80%, the sensing grating 6 is a uniform fiber grating, and the central wavelength of the fiber grating is 1550.684nm , the 3dB bandwidth is 0.310nm, the geometric length of the fiber grating is 7mm, and the reflectivity of the grating is greater than 80%. The geometric length is 5mm, the reflectivity of the grating is greater than 80%, the inner radius of the hollow cylinder is 60mm, the outer radius is 70mm, the height is 500mm, the height of the proo...

Embodiment 3

[0028] In this embodiment, the material of the sensor is the same as that of Embodiment 1, but the structural parameters are different: the inner radius of the hollow cylinder is 55mm, the outer radius is 80mm, and the height is 600mm; the height of the proof mass is 30mm, and the radius is 80mm. , other components and the coupling relationship of the components are the same as in Embodiment 1.

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

No PUM Login to View More

Abstract

The invention provides an optical fiber grating three-dimensional vector vibration sensor which adopts a hollow cylinder structure. The hollow cylinder comprises a hollow sensitive cylinder, an inertial mass block, a base and a sensitive element optical fiber grating, wherein the inertial mass block is located at the top end of the hollow cylinder and is fixed at the top end of the hollow cylinder or connected with the hollow cylinder into an integral whole, and the hollow sensitive cylinder is fixed on the base or connected with the base into an integral whole. The optical fiber grating three-dimensional vector vibration sensor further comprises that the inertial mass block is provided with an optical fiber outlet hole and a base fixing screw hole, wherein the optical fiber outlet hole is used for leading out three optical fibers and is sealed by a sealing material; and the base fixing screw hole is used for fixing a three-dimensional vector vibration sensor. A uniform sensitive strain area of the hollow sensitive cylinder is packaged with a sensing grating, and the sensing grating is connected with an external demodulation unit through the optical fiber outlet hole.

Description

【Technical field】 [0001] The invention belongs to the technical field of optical fiber sensors, and in particular relates to an optical fiber grating vibration sensor for measuring the vibration direction, amplitude and frequency of an object. 【Background technique】 [0002] As a wavelength device, fiber grating has broad application prospects in the field of optical communication and sensing, especially in the field of optical sensing, which has made revolutionary progress, and can realize the measurement of many physical quantities by using wavelength as the detection object. It has a wide range of applications in the fields of health detection of large structures and infrastructure, geodynamics and geophysical exploration. Researchers have conducted a lot of research on it, and have made achievements in quasi-static FBG sensing technologies such as temperature, pressure and strain. Preliminary success. The FBG acceleration detection technology is a very popular research ...

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 Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 刘钦朋贾振安傅海威禹大宽高宏
Owner XI'AN PETROLEUM UNIVERSITY