Fiber bragg grating strain sensor precision measuring device and method based on FPI interferometer
A technology of strain sensor and optical fiber grating, which is applied in the direction of measuring device, optical device, instrument, etc., can solve the problems of easily damaged grating grating area, large dependence on pasting process, difficulty in high-precision measurement and reusability, and achieves a solution The accuracy and repeatability are not high enough to ensure repeated use and improve the effect of measurement accuracy
Active Publication Date: 2021-10-12
BEIJING INST OF AEROSPACE CONTROL DEVICES
View PDF6 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003]In engineering applications, the accuracy measurement of strain sensors directly affects the structural health monitoring of key parts of important structures. The scheme of moment beam and tension requires the grating to be pasted on the moment beam and tensile specimen, which is highly dependent on the pasting process and is easy to damage the grating area, making it difficult to achieve the goal of high-precision measurement and reusability
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0061] Such as figure 1 As shown, the measurement method of the high-precision fiber grating strain sensor based on FPI interference of the present invention mainly includes: an optical path system and a demodulation system.
[0062] Among them, the optical path system includes an optical platform 1, a high-precision translation stage 2, a high reflection mirror 3, a coated optical fiber 4, an optical fiber grating temperature sensor 6, an optical fiber 7, and a sensing optical cable. The fiber grating strain sensor 5 is arranged on the optical fiber 7 . The optical platform 1 provides a stable test platform for measuring the optical path, and the high-precision translation stage 2 mainly provides stable stretching to generate a standard strain value to ensure a stable standard stretching amount of the strain sensor to be tested. The high-reflection plane mirror 3 will be vertically fixed on the base of the optical table 1, and form a stable FPI cavity with the coated optical...
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
| Property | Measurement | Unit |
|---|---|---|
| reflectance | aaaaa | aaaaa |
| transmittivity | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a fiber bragg grating strain sensor precision measuring device and method based on an FPI interferometer. The ratio of the change value of the cavity length of the FPI to the length of the optical fiber of the sensor to be measured is used as a standard strain value, and the measurement precision of the optical fiber grating strain sensor is obtained according to the standard strain value and the strain value of the optical fiber grating strain sensor after temperature compensation. According to the fiber bragg grating strain sensor precision measurement device and method based on the FPI interferometer, precision measurement testing superior to 5 mu epsilon fiber bragg grating strain sensors can be achieved, and high-precision measurement application of health monitoring of key part structures can be conveniently achieved through the fiber bragg grating sensing technology.
Description
technical field [0001] The invention belongs to the technical field of fiber grating measurement, and in particular relates to an FPI interferometer-based precision measurement device and method for a fiber grating strain sensor. Background technique [0002] Compared with the traditional electrical sensing system, the fiber grating sensing system has the advantages of small size, anti-electromagnetic interference, corrosion resistance, electrical insulation, and multi-sensor multiplexing. The advantages of fiber grating sensing system make it widely used in aerospace, engineering structure monitoring, electric power, petrochemical, marine, medical and other fields. [0003] In engineering applications, the accuracy measurement of strain sensors directly affects the structural health monitoring of key parts of important structures. The current method for measuring strain accuracy of fiber grating strain sensors is based on equal moment beams and stretching schemes, which req...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/161G01B11/165
Inventor 王甫高红春蓝天唐才杰崔留住易小龙卞贺明李保勇薛渊泽梁宏光
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES