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Fiber grating pressure sensor free from temperature influence

A technology of pressure sensor and optical fiber grating, which is applied in the field of sensors, can solve problems such as temperature and pressure cross-sensitivity, and achieve the effects of large measurement range, easy process, and simple structure

Inactive Publication Date: 2009-09-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since both temperature and pressure changes will cause the central wavelength of the fiber grating to move, resulting in temperature and pressure cross-sensitivity

Method used

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  • Fiber grating pressure sensor free from temperature influence
  • Fiber grating pressure sensor free from temperature influence
  • Fiber grating pressure sensor free from temperature influence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: see attached image 3 , the fiber grating adopts a fiber Bragg grating 1, and the fiber Bragg grating 1 is packaged in a metal tubular housing 3 with one end open, and one end of the fiber grating 1 is passed through a small hole in the center of the unopened end face of the tubular housing 3 and connected to a single-mode optical fiber 9 It is connected with 2×2 3dB fiber optic coupler 5; there are four ports on both sides of the fiber coupler 5, and the other port on the side connected to the fiber coupler 5 is connected to the optical fiber refractive index matching solution 8 through a single-mode fiber 9 Middle; two ports on the other side of the fiber coupler 5, one end is connected to the broadband light source 6 through a single-mode fiber 9, and the other end is connected to the demodulation system 7 through a single-mode fiber 9; the fiber grating 1 is packaged by filling the polymer acrylate 2 in Tubular housing 3.

[0021] The assembly steps a...

Embodiment 2

[0022] Embodiment 2: see attached Figure 4 , the structural diagram of the fiber grating pressure sensor using packaging method 2. The packaging steps are as follows: (1) process the alloy tubular housing 4 and the protective back cover 11 so that the two can be connected by sealing threads, and the inner wall of the tubular housing 4 is also ground into a rough surface; (2) remove the fiber Bragg grating 1 package Part of the coating layer; (3) placing the fiber grating 1 on the central axis of the tubular housing 4 and pre-stretching it, and then encapsulating the prepared polymer polyurethane 2 in the tubular housing 4; (4) placing A protective back cover 11 is added to the tubular casing 4, and the encapsulated polymer 2 is cured for calibration measurements. Its measurement method and image 3 Same as shown.

[0023] Compare image 3 shown in Example 1 and Figure 4 From the shown embodiment 2, it can be concluded that the main difference between the two lies in the...

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Abstract

The invention relates to a fiber grating pressure sensor free from temperature influence. The fiber grating pressure sensor is characterized in that a fiber grating is encapsulated in a tubular shell of which one end is open; one end of the fiber grating runs through a pore in the center of the unopened end face of the tubular shell, and a monomode fiber is connected with a fiber coupler; two sides of the fiber coupler are provided with four ports together; another port of one side connected with the fiber coupler is connected with and runs through the monomode fiber and is positioned in a fiber refractive index matching fluid; in two port of the other side of the fiber coupler, one port is connected with a broadband light source through the monomode fiber, and the other port is connected with a demodulation system through the monomode fiber; and the encapsulation of the fiber grating adopts the filling of a polymer to the tubular shell. The fiber grating pressure sensor only utilizes one fiber grating as a pressure sensitive element, can avoid the accurate sensing influence of the change of ambient temperature on a pressure signal, can change the stretching amount of reflection spectrum bandwidth of the fiber grating through the change of elasticity modulus of the polymer, and further changes the measuring precision and measuring range of the sensor.

Description

technical field [0001] The invention relates to an optical fiber grating pressure sensor free from temperature influence, which belongs to the technical field of sensors, in particular to a pressure sensor technology in which the sensitive element is an optical fiber grating. Background technique [0002] With the continuous development of fiber sensitization technology and the continuous maturity of fiber grating writing technology, fiber grating as a new type of strain sensing element has been widely used in the field of sensing technology. There are many types of traditional pressure sensors, such as piezoresistive pressure sensors based on the piezoresistive effect of semiconductor materials, capacitive pressure sensors based on pressure-sensitive capacitors, and piezoelectric pressure sensors based on the piezoelectric effect of materials. The common feature of these pressure sensors is that they are all active structures, so they are susceptible to interference from en...

Claims

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Application Information

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IPC IPC(8): G01L1/24G01L11/02
Inventor 赵建林姜碧强潘子军邸江磊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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