Gas detector using a golay cell

Patent metadata

Field	Value
Publication number	US-9606049-B1
Application number	US-201514879920-A
Country	US
Kind code	B1
Filing date	Oct 9, 2015
Priority date	Oct 9, 2015
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

Gas detector devices, systems, and methods using a Golay cell are described herein. One device includes a microphone having a front surface with an sound collecting aperture for receiving sound, a substrate, a gas cavity formed in the substrate such that the gas cavity is in gas communication with the sound collecting aperture and the front surface forms a side surface of the gas cavity, and a window abutting the substrate to form a side surface of the gas cavity.

First claim

What is claimed:

1. A gas detector device using a Golay cell, comprising:
a microphone having a front surface with a sound collecting aperture for receiving sound;
a substrate;
a gas cavity formed in the substrate such that the gas cavity is in gas communication with the sound collecting aperture and the front surface forms a side surface of the gas cavity; and
a window abutting the substrate to form a side surface of the gas cavity.

2. The device of claim 1 , wherein the substrate includes a first substrate portion abutting the sound collecting surface and wherein the first substrate portion has an aperture formed through the first substrate portion with a first end of the aperture directed toward the sound collecting surface;
a second substrate portion abutting the first substrate portion such that the second substrate portion forms side surfaces of a gas cavity and the first substrate portion forms a top surface of the gas cavity such that the gas cavity is in gas communication with the aperture.

3. The device of claim 1 , wherein the window allows transmittance of light through the window.

4. The device of claim 1 , wherein the window is opaque to all light that is not within a particular range of wavelengths.

5. The device of claim 1 , wherein the gas cavity has ambient gas therein.

6. The device of claim 1 , wherein gas cavity has only a particular gas therein.

7. The device of claim 1 , wherein the gas cavity has only a particular set of gases therein.

8. The device of claim 1 , wherein the cavity is sealed such that ambient gas cannot enter the cavity once it is sealed.

9. A gas detecting system using a Golay cell, comprising:
a gas detector including:
a microphone having front surface with a sound collecting aperture for receiving sound;
a substrate abutting the front surface of the microphone;
a gas cavity formed in the substrate such that the gas cavity is in gas communication with the aperture;
a window abutting the substrate forming a side surface of the gas cavity;

an optical generation chamber; and
a light source to direct light toward the gas detector.

10. The system of claim 9 , wherein the light source is within the optical generation chamber.

11. The system of claim 9 , wherein the optical generation chamber is formed from at least one wall having a material that includes a gas permeable portion.

12. The system of claim 9 , wherein the optical generation chamber is formed by an interior surface and at least a portion of the surface is reflective.

13. The system of claim 9 , wherein the optical generation chamber is formed by an interior surface and the entire interior surface is reflective.

14. The system of claim 9 , wherein the optical generation chamber is formed within a housing and wherein the housing includes one or more openings to allow ambient gas to pass into and out of the chamber.

15. The system of claim 9 , wherein the light source is an infrared light source.

16. The system of claim 9 , wherein the light source generates infrared light and the window is transparent to the infrared light generated thereby allowing the light to pass through the window.

17. A gas detector using a Golay cell, comprising:
a microphone having a sound collecting aperture for receiving sound;
a substrate having a first surface abutting the sound collecting surface and a second surface and a gas cavity formed between the first surface and the second surface of the substrate and wherein the gas cavity is in gas communication with the sound collecting aperture; and
a window abutting the second surface of the substrate to seal the gas cavity.

18. The detector of claim 17 , wherein the microphone and substrate are hermetically sealed together.

19. The detector of claim 17 , wherein the substrate includes multiple layers.

20. The detector of claim 19 , wherein the layers of the substrate are hermetically sealed together.

Assignees

• Honeywell Int Inc

Inventors

• Yang Wei
• Marta Teresa M
• Willett Martin
• Watts Rodney R

Classifications

• G01N2201/12

  Circuits of general importance; Signal processing · CPC title

• G01N2201/068

  Optics, miscellaneous · CPC title

• G01N21/61

  Non-dispersive gas analysers {(G01N21/3504 takes precedence)} · CPC title

• G01N2021/1704

  in gases · CPC title

• G01N33/0027

  concerning the detector · CPC title