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Air-breathing optical fiber Fabry-Perot total temperature probe and measuring system thereof

An air-breathing, fiber-optic technology, applied in the field of air-breathing fiber-optic total temperature probes and their measurement systems, can solve the problems of large temperature sensing area, large heat capacity, and difficulty in adapting to high-speed dynamic temperature measurement. Achieve the effects of reducing the force section, reducing the impact force, improving the temperature measurement speed and test accuracy

Active Publication Date: 2020-11-03
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature-sensing area of ​​the probe with this structure is relatively large, resulting in a large heat capacity, which makes it difficult to meet the needs of high-speed dynamic temperature measurement. Targeted improvements must be made to meet the test requirements of the above-mentioned special application environments.

Method used

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  • Air-breathing optical fiber Fabry-Perot total temperature probe and measuring system thereof
  • Air-breathing optical fiber Fabry-Perot total temperature probe and measuring system thereof
  • Air-breathing optical fiber Fabry-Perot total temperature probe and measuring system thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment discloses an air-breathing fiber-optic Perth total temperature probe applied to the internal flow channel of an aero-engine, see Figure 1 to Figure 3 , including an L-shaped pipe, an optical fiber Fab sensor 3, a Fab support steel pipe 4 and a vacuum pump.

[0035] The L-shaped duct includes an air inlet 1 and an air induction pipe 2 .

[0036] The upper end of the inlet duct 1 is open, and the interior of the inlet duct 1 has a steady flow channel 101 , a converging channel 102 , a throat 103 , and an expanding channel 104 in sequence from top to bottom.

[0037] The air induction pipe 2 is connected downstream of the intake duct 1 and communicates with the expansion channel 104 of the intake duct 1, and the two form an L-shaped pipeline structure.

[0038] The head of said Faber support steel pipe 4 stretches into the converging channel 102 of the air intake 1, and its lower end passes through the expansion channel 104 of the air intake 1, and passes...

Embodiment 2

[0047] This embodiment provides a relatively basic implementation method, a kind of air-breathing optical fiber method Perth total temperature probe, see Figure 1 to Figure 3 , including an L-shaped pipe, an optical fiber Fab sensor 3, a Fab support steel pipe 4 and a vacuum pump.

[0048] The L-shaped duct includes an air inlet 1 and an air induction pipe 2 .

[0049] The upper end of the inlet duct 1 is open, and the interior of the inlet duct 1 has a steady flow channel 101 , a converging channel 102 , a throat 103 , and an expanding channel 104 in sequence from top to bottom.

[0050] The air induction pipe 2 is connected downstream of the intake duct 1 and communicates with the expansion channel 104 of the intake duct 1, and the two form an L-shaped pipeline structure.

[0051] The head of the Fapo support steel pipe 4 extends into the converging channel 102 of the air inlet 1 , and the lower end passes through the bottom of the air inlet 1 .

[0052] The fiber optic F...

Embodiment 3

[0056] The main structure of this embodiment is the same as that of Embodiment 2, further, refer to Figure 4 , the fiber optic Fab sensor 3 includes a thermal etalon 301 , a reflective metallic aluminum film 302 and an incident metallic nickel film 303 .

[0057] The heat-sensitive etalon 301 is a heat-sensitive ZnSe etalon with a thickness of 1.5 μm, which has a relatively high thermo-optic coefficient. Changes in temperature will cause changes in the refractive index of the etalon, thereby causing light to travel within the heat-sensitive etalon 301. The change.

[0058] The reflective metal aluminum film 302 is an opaque metal film with a thickness of 100 nm. The reflective metal aluminum film 302 is connected to the upper end of the thermal etalon 301 . The incident metal nickel film 303 is a translucent metal film with a thickness of 10 nm. The incident metal nickel film 303 is connected to the lower end of the thermal etalon 301 .

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Abstract

The invention discloses an air-breathing optical fiber Fabry-Perot total temperature probe and a measuring system thereof. The air-breathing optical fiber Fabry-Perot total temperature probe comprisesan L-shaped pipeline, an optical fiber Fabry-Perot sensor, a Fabry-Perot supporting steel pipe and a vacuum pump, the L-shaped pipeline comprises an air inlet channel and an air entraining pipe; a steady flow channel, a convergence channel, a throat part and an expansion channel are sequentially arranged in the air inlet channel from top to bottom; the air entraining pipe is connected to the lower end of the air inlet channel and communicates with the expansion channel of the air inlet channel; the head of the Fabry-Perot supporting steel pipe extends into a convergence channel of the air inlet channel, and the lower end penetrates out of the bottom of the air inlet channel; the optical fiber Fabry-Perot sensor is installed in a convergence channel of the air inlet channel. During work, the air entraining pipe is pumped through the vacuum pump, the air speed of the convergence channel at the inlet of the air inlet channel is in a relatively high-speed and stable state, and when the convergence section reaches a supercritical state, the local convective heat transfer coefficient around the Fabry-Perot sensor is increased to a stable value and is not influenced by incoming flow static pressure and flow speed fluctuation; therefore, the temperature measurement speed, the temperature measurement precision and the stability of the total temperature probe are improved.

Description

technical field [0001] The invention belongs to the technical field of temperature sensing and measurement, and in particular relates to an air-breathing fiber-optic Perth total temperature probe and a measurement system thereof. Background technique [0002] Transient temperature is an important parameter for high-temperature flow field and thermodynamic analysis of temperature-resistant devices in applications such as combustion and high-speed heat transfer. The high-speed dynamic and accurate measurement of transient temperature is of great significance in many fields of defense industries such as aerospace, gas turbines, and missile explosives. Crucial role. For example, in the development of aero-engines, it is necessary to conduct high-speed dynamic tests on the airflow temperature at the inlet outlet, between rotor stages, etc.; in the research of weapons such as missile gas jets, ammunition explosions, and inner and outer walls of gun barrels, transient temperature t...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K1/14G01K1/08
CPCG01K11/32G01K1/14G01K1/08
Inventor 刘显明单智超陈昱如章鹏雷小华候孟陈伟民
Owner CHONGQING UNIV
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