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Sensing device for optical fiber optical grating flow speed

A fiber grating and sensing device technology, applied in the direction of measuring fluid velocity by pressure difference, detecting fluid flow by measuring pressure difference, volume/mass flow generated by mechanical effects, etc.

Inactive Publication Date: 2006-04-12
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The search results show that there is currently no patent report on the use of fiber gratings to realize flow velocity and flow sensing

Method used

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  • Sensing device for optical fiber optical grating flow speed
  • Sensing device for optical fiber optical grating flow speed
  • Sensing device for optical fiber optical grating flow speed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] The velocity-pressure tube is made of glass.

[0036] The airtight telescopic tube is made of aluminum foil tube.

[0037] The airtight cylinder and the split ring are made of plexiglass (Young's modulus is about 2500Mpa).

[0038] Fiber Bragg grating is a fiber Bragg grating written by using quartz single-mode fiber, using ultraviolet exposure technology and phase mask method, or a long-period fiber grating written by using amplitude mask method. The fiber grating is pasted on the side of the split ring straight beam. The fiber is a quartz single-mode fiber; the fiber coupler is a 2×2 or 1×2 fiber coupler.

[0039] The light source is a broadband light source or a tunable fiber laser; the optical detector is a fiber optic spectrometer.

[0040] The actually manufactured flow rate-pressure tube has an inner diameter of 26.5mm and a throat inner diameter of 11.0mm. The effective cross-sectional area of ​​the telescopic tube S=9.5×10 -3 m2 , the fiber Bragg grating u...

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Abstract

This invention relates to a sensor capable of timely monitoring and measuring the parameters of flow rate and flow capacities of various fluids composed of a sealed extension tube, a fiber grating, a split ring and fibers characterizing that the flow rates of the designed flow rate pressure tube are different at two places, which are used in converting the flow rate to pressure for sensing and monitoring. When a fluid flows through the tube, a pressure difference exists between the inside and outside of the extension tube to drive it to extend and shorten along the axis and further to drive the split ring to compress and extend to result in the shift of the fiber grating central wavelength to be used to sense and monitor parameters of flow rates and flow capacities of high flexibility.

Description

technical field [0001] The invention relates to a sensing device, capable of high-precision real-time monitoring and measurement of parameters such as flow velocity and flow rate of various fluids, and can be widely used in many fields such as building structures, aerospace, marine exploration and scientific research, and belongs to a Novel non-destructive testing technology. Background technique [0002] Fiber Bragg Grating is a new photonic device that has appeared recently, which is a spatially periodic refractive index distribution formed in the fiber core. This periodic structure can change and control the propagation behavior of light waves in optical fibers. The fiber grating sensor is to embed the fiber grating inside the substrate material and structure or paste it on its surface to make it sensitive to the parameter to be measured, and sense the size and direction of the parameter to be measured through the change of the wavelength and bandwidth of the fiber grati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/14G01F1/34
Inventor 张伟刚涂勤昌陈建军刘波金龙邹玉姣开桂云袁树忠董孝义
Owner NANKAI UNIV
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