Dual wavelength source gas detector

Patent metadata

Field	Value
Publication number	US-10422740-B2
Application number	US-201615202324-A
Country	US
Kind code	B2
Filing date	Jul 5, 2016
Priority date	Apr 21, 2016
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

Devices, methods, systems, and computer-readable media for a dual wavelength source gas sensor are described herein. One or more embodiments include a gas sensor, comprising: a dual wavelength source to transmit a first wavelength and a second wavelength via an optical path, wherein a gas is present through the optical path, a detector to receive the first wavelength and the second wavelength via the optical path, and a computing device coupled to the detector to determine an determine a signal intensity for the first wavelength and the second wavelength.

First claim

What is claimed:

1. A gas sensor, comprising:
a dual wavelength source configured to transmit a first wavelength and a second wavelength via an optical path, wherein a gas is present through the optical path, and wherein the first wavelength and the second wavelength are separately addressable at the dual wavelength source such that the first wavelength and the second wavelength are transmitted at different frequencies;
a detector configured to receive the first wavelength and the second wavelength via the optical path; and
a processor coupled to the detector and configured to:
determine a signal intensity for the first wavelength and the second wavelength;
determine an error in the signal intensity of the first wavelength based on the signal intensity of the second wavelength; and
generate an alarm signal based on the determined error.

2. The gas sensor of claim 1 , wherein the first wavelength is a sample wavelength within an absorption range of the gas.

3. The gas sensor of claim 1 , wherein the second wavelength is a reference wavelength that is outside an absorption range of sample molecules within the gas and interferent gases present within the gas.

4. The gas sensor of claim 1 , wherein the dual wavelength source is a scanning emitter.

5. The gas sensor of claim 1 , wherein the processor is further configured to perform a deconvolution process on the first wavelength and the second wavelength when the first wavelength and the second wavelength are received at the detector.

6. The gas sensor of claim 1 , wherein the dual wavelength source is configured to transmit the first wavelength and the second wavelength at different frequencies, duty cycles, and pulse patterns.

7. The gas sensor of claim 1 , wherein the processor is further configured to utilize the second wavelength to monitor source intensity.

8. The gas sensor of claim 1 , wherein the detector is a dual band photodetector.

9. A system for a gas sensor, comprising:
a dual wavelength source configured to transmit a first wavelength via a first optical path and a second wavelength via a second optical path, wherein the first optical path and the second optical path are similar, and wherein the dual wavelength source is further configured to transmit the first wavelength at a first frequency and the second wavelength at a second frequency that is different than the first frequency;
a detector to receive the first wavelength and the second wavelength through a gas; and
a processor coupled to the detector and configured to:
determine a density level of the gas based on an intensity of the first wavelength and the second wavelength;
determine error in the density level based on the intensity of the second wavelength; and
generate an alarm signal based on the determined error.

10. The system of claim 9 , wherein the dual wavelength source is a stacked source.

11. The system of claim 10 , wherein the stacked source is configured to transmit the first wavelength, the second wavelength, and a number of additional wavelengths.

12. The system of claim 9 , wherein a portion of the second wavelength passes through the first optical path.

13. The system of claim 9 , wherein the dual wavelength source is a stacked laser or a stacked light emitting diode (LED).

14. The system of claim 9 , wherein the detector is a stacked detector.

15. The gas sensor of claim 3 , wherein the processor is configured to use an absorption of the reference wavelength to identify a system failure.

16. A system for a gas sensor, comprising:
a dual wavelength source configured to transmit a first wavelength via a first optical path and a second wavelength via a second optical path, wherein the first optical path and the second optical path are similar, and wherein the first wavelength and the second wavelength are separately addressable at the dual wavelength source such that the first wavelength and the second wavelength are transmitted at different frequencies;
a detector to receive the first wavelength and the second wavelength through a gas; and
a processor coupled to the detector and configured to:
determine a density level of the gas based on an intensity of the first wavelength and the second wavelength;
determine error in the density level based on the intensity of the second wavelength; and
generate an alarm signal based on the determined error.

17. The system of claim 16 , wherein the dual wavelength source comprises a plurality of emitters, wherein a first emitter of the plurality of emitters is configured to produce the first wavelength, wherein a second emitter of the plurality of emitters is configured to produce the second wavelength, and wherein the first emitter and the second emitter are separately addressable.

18. The system of claim 16 , wherein the dual wavelength source is configured to transmit the first wavelength, the second wavelength, and a number of additional wavelengths.

19. The system of claim 16 , wherein dual wavelength source is a stacked source.

Assignees

• Honeywell Int Inc

Inventors

• Marta Teresa M
• Willett Martin
• Fritz Bernard

Classifications

• G01N2021/3181

  using LEDs · CPC title

• G01N21/3151

  using two sources of radiation of different wavelengths (G01N21/33 - G01N21/39 take precedence) · CPC title

• G01N21/39

  using tunable lasers · CPC title

• G01N2021/3148

  using three or more wavelengths · CPC title

• G01N21/314 Primary

  with comparison of measurements at specific and non-specific wavelengths (dual wavelength spectrometry G01J3/427) · CPC title