MULTISPECTRAL BAND SENSOR

• US 20170370778A1
• Filed: 08/14/2017
• Published: 12/28/2017
• Est. Priority Date: 03/28/2016
• Status: Abandoned Application

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Au, Kwong Wing, Cole, Barrett E., Larsen, Christopher S., Venkatesha, Sharath
• Application Number:
  US15/676,720
• Publication Number:
  US 20170370778A1
• Time in Patent Office: Days
• CPC Class Codes: G01J 2003/1213 Filters in general, e.g. dichroic, band
• CPC Class Codes: G01J 3/0208 using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
• CPC Class Codes: G01J 3/027 Control of working procedures of a spectrometer; Failure detection; Bandwidth calculation
• CPC Class Codes: G01J 3/2803 using photoelectric array detector
• CPC Class Codes: G01J 5/0018 Flames, plasma or welding
• CPC Class Codes: G01J 5/602 using selective, monochromatic or bandpass filtering

Abstract

Devices, methods, systems, and computer-readable media for a multiband detector are described herein. One or more embodiments include a multiband detector designed to detect an emission source including a broadband lens, a broadband detector, and a filter that allows electromagnetic radiation entering the system to be filtered into at least two wavelength bands before contacting the broadband detector wherein one or more wavelength bands are used to determine system functionality and wherein one or more other wavelength bands are used to identify the presence of an emission source having a characteristic particular wavelength or wavelength range.

Claims

1. A filter, comprising:

wavelength bands to allow electromagnetic radiation entering the filter to be filtered into at least two wavelength ranges before contacting a detector to identify a presence of an emission source having a particular wavelength range.

2. The filter of claim 1, wherein one of the at least two wavelength ranges are used to determine a functionality of a system.

3. The filter of claim 1, wherein the detector is a bolometer that operates over mid-wavelength infrared (MWIR) and long wavelength infrared (LWIR) ranges.

4. The filter of claim 1, wherein the emission source is a flame.

5. The filter of claim 1, wherein one of the wavelength ranges is 4.3 micrometers or 2.7 micrometers.

6. The filter of claim 1, wherein a spectral transmission of the filter is set such that a first wavelength range of electromagnetic radiation from an emission source has a different intensity than a second wavelength range of electromagnetic radiation from the emission source.

7. The filter of claim 5, wherein a first wavelength range and a second wavelength range is used to determine a fail safe condition.

8. The filter of claim 1, wherein the filter includes a narrow band transmission between 4.3 and 4.7 micrometers (μ

m).

9. A system for a multiband detector, comprising:

a filter to allow a first wavelength band of electromagnetic radiation within a mid-wavelength infrared (MWIR) range and a second wavelength band of electromagnetic radiation within a long wavelength infrared (LWIR) range; and

a computing device coupled to a detector to provide detection of an emission source based on received transmitted radiation from the first wavelength band within the MWIR range and a fail safe operation based on the received transmitted radiation from the second wavelength band within the LWIR range.

10. The system of claim 9, wherein the detector is a bolometer that detects both the first and second wavelength bands at each pixel of the bolometer.

11. The system of claim 9, comprising an imaging lens coupled to the filter.

12. The system of claim 9, wherein the computing device determines whether the presence of the emission source having characteristics in the first wavelength band based on data received from the detector.

13. The system of claim 9, wherein the LWIR of the received transmitted radiation is utilized by the computing device to determine an existence of obstructions between the radiation and the broadband detector.

14. The system of claim 13, wherein the computing device determines the existence of obstructions by comparing data sets from the detector at different points in time.

15. A system for a multiband detector, comprising:

a lens to receive radiation from a field of view for an area;

a filter to receive radiation from the lens, wherein the filter allows a first wavelength band within a mid-wavelength infrared (MWIR) and a second wavelength band within a long wavelength infrared (LWIR) to pass through the filter;

a broadband detector to receive transmitted wavelengths from the filter; and

a computing device coupled to the broadband detector to determine an existence of obstructions of radiation received by the lens.

16. The system of claim 15, wherein the MWIR received by the broadband detector is utilized by the computing device to identify a number of flames over the complete field of view.

17. The system of claim 15, wherein the MWIR is detected on a pixel by pixel basis by the computing device.

18. The system of claim 15, wherein MWIR and LWIR bands are matched with a dynamic range of the broadband detector such that the wavelength bands are uniform across all spectral bands.

19. The system of claim 15, wherein the computing device determines when an obstruction exists on the lens when the computing device determines an absence of LWIR received at the broadband detector.

20. The system of claim 15, wherein the broadband detector has an 8 bit resolution.