Gas temperature sensing device

Abstract

A gas temperature sensing device includes a sensing membrane. The sensing membrane comprises a super-aligned carbon nanotube film and thermochromic particles. The super-aligned carbon nanotube film is transparent and has two opposing surfaces, with thermochromic particles attached to at least one surface. The thermochromic particles have reversible thermochromic properties and a color-changing critical temperature. When the gas temperature is below the color-changing critical temperature, the thermochromic particles cause the sensing membrane to display a first color; when the gas temperature is above the color-changing critical temperature, the thermochromic particles cause the sensing membrane to display a second color, which is different from the first color. By causing color changes in the sensing membrane due to gas flow and temperature variations, visual monitoring of the gas temperature field is achieved. This sensing membrane has a fast response speed, and the color change is reversible, allowing for repeated use.

Claims

1. A gas temperature sensing device, improved in that it comprises: The sensing membrane comprises a super-aligned carbon nanotube film and thermochromic particles. The super-aligned carbon nanotube film is transparent and has two opposing surfaces. At least one of the surfaces is coated with the thermochromic particles, which are microencapsulated particles. The thermochromic particles have reversible thermochromic properties and a color-changing critical temperature. When the gas temperature is below the color-changing critical temperature, the thermochromic particles cause the sensing membrane to display a first color. When the gas temperature is above the color-changing critical temperature, the thermochromic particles cause the sensing membrane to display a second color, which is different from the first color.

2. The gas temperature sensing device according to claim 1, wherein, The thermochromic particles comprise a transparent outer shell and a thermochromic material encapsulated within the outer shell.

3. The gas temperature sensing device according to claim 2, wherein, The outer shell layer is made of a high molecular polymer.

4. The gas temperature sensing device according to claim 2, wherein, The thermochromic material is a leuco dye, selected from one of the following: triphenylmethane leuco dyes, spiropyran leuco dyes, pyrene leuco dyes, and furan leuco dyes.

5. The gas temperature sensing device according to claim 2, wherein, The thermochromic particles are spherical with a diameter of 1~10µm, and the outer shell layer has a thickness of 0.2~0.5µm.

6. The gas temperature sensing device according to claim 1, wherein, The areal loading of the thermochromic particles on the super-aligned carbon nanotube film is 200-800 μg / cm2.

7. The gas temperature sensing device according to claim 1, wherein, The thickness of the super-aligned carbon nanotube film is 12-18 nm.

8. The gas temperature sensing device according to claim 1, wherein, The specific surface area of ​​the super-aligned carbon nanotube film is 92-99 m² / g.

9. The gas temperature sensing device according to claim 1, wherein, The gas temperature sensing device also includes an outer frame surrounding the sensing membrane.

10. The gas temperature sensing device according to claim 9, wherein, The gas temperature sensing device also includes a mounting base, in which a portion of the outer frame is inserted.

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