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Fiber bragg grating measurement system and method for cylindrical structure thermal diffusivity

A fiber grating and measurement system technology, applied in the field of material thermophysical parameter measurement, can solve problems such as high requirements for experimental environment and conditions, and achieve the effects of good work reliability, strong versatility, and improved result accuracy

Active Publication Date: 2013-07-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0007] The existing research results show that both the steady-state method and the unsteady-state method have certain complexity, require a special experimental system, and have high requirements on the experimental environment and conditions; and it is rare to use fiber gratings for thermal Diffusion rate measurement

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  • Fiber bragg grating measurement system and method for cylindrical structure thermal diffusivity
  • Fiber bragg grating measurement system and method for cylindrical structure thermal diffusivity
  • Fiber bragg grating measurement system and method for cylindrical structure thermal diffusivity

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Embodiment Construction

[0039] The measurement system of the present invention is composed of a heating water tank, a water pump, a thermocouple, a cylinder structure to be measured, a thermal insulation sealing material, an optical fiber grating sensor, an optical fiber grating demodulator, and a control valve.

[0040] Among them, the heating water tank, the water pump, and the cylinder to be tested are connected with water pipes, and the control valve is located between the cylinder to be tested and the heating water tank to control the speed of the water flow; the water pump is located between the heating water tank and the cylinder to be tested, and its function It is to inject the water in the heating water tank into the cylindrical structure and maintain dynamic circulation; the water pipe is combined with the thermal insulation sealing material to communicate with the cylindrical structure to be tested; the fiber gratings are respectively fixed on the inner and outer walls of the structure, and...

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Abstract

Belonging to the technical field of measurement, the invention relates to a fiber bragg grating measurement system and a method for cylindrical structure thermal diffusivity. The measurement system comprises a heating water tank (1), a water pump (2), a to-be-measured cylinder (5), a control valve (10), an inner wall thermocouple (3), an outer wall thermocouple (4), an inner wall fiber bragg grating sensor (7), and an outer wall fiber bragg grating sensor (8). The measurement method needs: first measuring the change of a central wavelength of the fiber bragg grating sticked on a structure surface along with temperature, and calculating the functional relationship between temperature and the grating central wavelength; second, heating the cylindrical structure by flowing hot water, and measuring the fiber bragg grating central wavelength change along with time so as to obtain the functional relationship of time and the fiber bragg grating central wavelength; then according to a Fourier's second law and boundary conditions, conducting calculation to obtain a temperature-time function; and finally according to a Fourier's one-dimensional heat conduction equation, calculating the thermal diffusivity of the material.

Description

technical field [0001] The invention relates to the technical field of measuring thermophysical parameters of materials, including a fiber grating measuring system and method for the thermal diffusivity of a cylindrical structure, and in particular to a method for measuring the thermal diffusivity of a cylindrical structure by using an optical fiber grating. Background technique [0002] Heat transfer is one of the most common natural phenomena. Almost all engineering fields will encounter some heat transfer problems under specific conditions. Now science and technology are advancing by leaps and bounds, nuclear power is large-scaled, space technology is in-depth development, etc., heat transfer analysis is required Detailed and precise heat transfer calculations. [0003] Cylindrical structures have high specific strength, specific stiffness and low expansion characteristics, so they are widely used in structures with high performance and low weight requirements. These appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
Inventor 曾捷周雅斌张倩昀周鹏章晓燕李继峰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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