System and method for detecting unknown materials using short wave infrared hyperspectral imaging

• US 9,658,104 B2
• Filed: 02/04/2013
• Issued: 05/23/2017
• Est. Priority Date: 04/05/2010
• Status: Active Grant

• Current Assignee: Chemimage Corporation
• Original Assignee: Chemimage Corporation
• Inventors: Treado, Patrick J., Nelson, Matthew, Gardner, Charles W.
• Primary Examiner(s): Ayub, Hina F
• Application Number:
  US13/758,742
• Publication Number:
  US 20130214162A1
• Time in Patent Office: 1,569 Days
• Field of Search: 356 72- 73
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0218 using optical fibers
• CPC Class Codes: G01J 3/28 Investigating the spectrum using colour filters G01J3/51
• CPC Class Codes: G01J 3/32 Investigating bands of a spectrum in sequence by a single detector
• CPC Class Codes: G01J 3/44 Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
• CPC Class Codes: G01N 21/3563 for analysing solids; Preparation of samples therefor
• CPC Class Codes: G01N 21/359 using near infrared light
• CPC Class Codes: G01N 33/0057 for warfare agents or explosives properties of explosives G01N33/227

Abstract

A system and method for analyzing unknown materials on surfaces including, but not limited to, chemical materials, biological materials, hazardous materials, drug materials, and non-threat materials using SWIR and/or extended range SWIR hyperspectral and spectroscopic techniques. A system comprising a collection optics, a tunable filter, and a first detector for generating a test data set representative of the unknown sample. A second detector, comprising a visible imaging device, may be configured to operate in a scanning mode to locate areas of interest for further interrogation using SWIR. A method comprising generating a SWIR test data set representative of the unknown sample and analyzing the unknown sample to detect, identify and/or distinguish an unknown material as a known material. This analysis may be achieved by comparing the test data set to a reference data set using at least one chemometric technique.

Claims

1. A method comprising:

collecting a plurality of interacted photons from an unknown sample;

generating a first test data set from a first detector, the first data set comprising a short-wave infrared hyperspectral image from a first plurality of the plurality of interacted photons collected at wavelengths ranging from about 900-1,700 nm;

generating a second test data set from the first detector, the second data set comprising an extended short-wave infrared hyperspectral image from a second plurality of the plurality of interacted photons collected at wavelengths ranging from about 1,200-2,500 nm; and

analyzing the first test data set and the second test data set to associate the unknown sample with a known sample.

2. The method of claim 1, wherein the plurality of interacted photons are generated by illuminating the unknown sample.

3. The method of claim 2, wherein illuminating the unknown sample comprises applying wide-field illumination.

4. The method of claim 2, wherein the illuminating comprises at least one of active illumination and passive illumination.

5. The method of claim 1, further comprising passing the plurality of interacted photons through a tunable filter configured to filter the interacted photons into a plurality of wavelength bands.

6. The method of claim 5, wherein the tunable filter further comprises one or more of a multi-conjugate tunable filter, a Fabry Perot angle tuned filter, an acousto-optic tunable filter, a liquid crystal tunable filter, a Lyot filter, an Evans split element liquid crystal tunable filter, a Solc liquid crystal tunable filter, a fixed wavelength Fabry Perot tunable filter, an air-tuned Fabry Perot tunable filter, a mechanically-tuned Fabry Perot tunable filter, and a liquid crystal Fabry Perot tunable filter.

7. The method of claim 1, wherein the unknown sample comprises one or more of a chemical material, a biological material, a hazardous material, a drug material, and a non-threat material.

8. The method of claim 7, wherein the drug material comprises one or more of a pharmaceutical drug and an illegal drug.

9. The method of claim 1, wherein the unknown sample comprises a material deposited on a surface.

10. The method of claim 9, wherein the surface comprises one or more of a part of a person, a part of an object associated with a person, and a part of a vehicle.

11. The method of claim 10, wherein the object associated with a person comprises one or more of a passport, a credit card, a driver'"'"'s license, a boarding pass, a piece of clothing, a human-wearable item, a shoe, luggage, a purse, a wallet, and an airline ticket.

12. The method of claim 10, wherein the object associated with a person comprises an object that has contacted the person.

13. The method of claim 1, further comprising:

generating at least one visible image representative of a first location; and

analyzing the visible image to identify a second location comprising the unknown sample.

14. The method of claim 13, wherein the visible image comprises an RGB video image.

15. The method of claim 1, wherein the analyzing comprises comparing the first test data set and the second test data set with at least one reference data set, wherein each reference data set is associated with a known sample.

16. The method of claim 15, wherein the comparing comprises applying at least one chemometric technique.

17. The method of claim 16, wherein the chemometric technique comprises one or more of a correlation analysis, a principle component analysis, a principle component regression analysis, a partial least squares analysis, a multivariate curve resolution analysis, a Mahalanobis distance analysis, an Euclidian distance analysis, a band target analysis, an entropy analysis, a hand target energy minimization analysis, a partial least squares discriminant analysis, an adaptive subspace detection analysis and combinations thereof.

18. The method of claim 1, wherein the analyzing further comprises extracting at least one spectrum from one or more of the first test data set and the second test data set.

19. A system comprising:

a collection optic configured to collect a plurality of interacted photons from an unknown sample;

a tunable filter configured to filter the plurality of interacted photons into a plurality of filtered photons comprising a plurality of wavelength bands;

a first detector configured to detect a first plurality of the plurality of filtered photons and generate a first test data set comprising a short-wave infrared hyperspectral image collected at wavelengths ranging from about 900-1,700 nm and detect a second plurality of the plurality of filtered photons and generate a second test data set comprising an extended short-wave infrared hyperspectral image collected at wavelengths ranging from about 1,200-2,500 nm.

20. The system of claim 19, wherein the unknown sample comprises one or more of a chemical material, a biological material, a hazardous material, a drug material, and a non-threat material.

21. The system of claim 19, wherein the unknown sample comprises a drug material selected from the group consisting of a pharmaceutical drug and an illegal drug.

22. The system of claim 19, wherein the unknown sample comprises a material deposited on a surface.

23. The system of claim 22, wherein the surface comprises one or more of a part of a person, a part of an object associated with a person, and a part of a vehicle.

24. The system of claim 23, wherein the object associated with a person comprises one or more of a passport, a credit card, a driver'"'"'s license, a boarding pass, a piece of clothing, a human-wearable item, a shoe, luggage, a purse, a wallet, and an airline ticket.

25. The system of claim 23, wherein the object associated with a person comprises an object that has contacted the person.

26. The system of claim 19, further comprising a second detector configured to scan a first location comprising the unknown sample.

27. The system of claim 26, wherein the second detector comprises a visible imaging device.

28. The system of claim 27, wherein the visible imaging device comprises an RGB video imaging device.

29. The system of claim 19, wherein the tunable filter further comprises one or more of a multi-conjugate tunable filter, a Fabry Perot angle tuned filter, an acousto-optic tunable filter, a liquid crystal tunable filter, a Lyot filter, an Evans split element liquid crystal tunable filter, a Solc liquid crystal tunable filter, a fixed wavelength Fabry Perot tunable filter, an air-tuned Fabry Perot tunable filter, a mechanically-tuned Fabry Perot, tunable filter, and a liquid crystal Fabry Perot tunable filter.

30. The system of claim 19, wherein the collection optic further comprises a telescope optic.

31. The system of claim 19, further comprising a reference database comprising at least one reference data set associated with a known material.

32. The system of claim 31, wherein the reference data set comprises one or more of a hyperspectral image and a spectrum.

33. The system of claim 19, wherein the system is further configured to operate with one or more of an active illumination source and a passive illumination source.

34. The system of claim 33, wherein the active illumination source comprises one or more of a laser light source and a broadband light source.

35. The system of claim 33, wherein the passive illumination source comprises one or more of solar radiation and ambient light.

36. The system of claim 19, further comprising a wide-field illumination source configured to generate the plurality of interacted photons.

37. The method of claim 19, wherein the first detector comprises one or more of an InGaAs detector, a CCD detector, a CMOS detector, an InSb detector, and a MCT detector.

38. A storage medium containing machine readable program code, which, when executed by a processor, causes the processor to perform the following:

generate a first test data from a first detector, the first data set comprising a short-wave infrared hyperspectral image collected at wavelengths ranging from about 900-1,700 nm and a second data set from the first detector, the second data set comprising an extended range short-wave infrared hyperspectral image data set collected at wavelengths ranging from about 1,200-2,500 nm; and

analyze the first test data set and the second test data set to associate the unknown sample to a known material.

39. The storage medium of claim 38, which when executed by a processor to analyze the first test data set and second test data set, causes the processor to compare the first test data set and the second test data set with at least one reference data set, wherein each reference data set is associated with a known material.

40. The storage medium of claim 39, which when executed by a processor to compare the first test data set and the second test data set with a reference data set causes the processor to apply at least one chemometric technique.

41. The storage medium of claim 38, which when executed by a processor to generate the test data set further causes the processor to configure a tunable filter to filter a plurality of interacted photons collected from the unknown sample into a plurality of wavelength bands.

42. The storage medium of claim 38, wherein the unknown sample comprises one or more of a chemical material, a biological material, a hazardous material, a drug material, and a non-threat material.

43. The storage medium of claim 38, wherein the unknown sample comprises a drug material selected from the group consisting of a pharmaceutical drug and an illegal drug.

44. The storage medium of claim 38, wherein the unknown sample comprises a material deposited on a surface.

45. The storage medium of claim 44, wherein the surface comprises one or more of a part of a person, an object associated with a person, and a part of a vehicle.

46. The storage medium of claim 45, wherein the object associated with a person comprises one or more of a passport, a credit card, a driver'"'"'s license, a boarding pass, a piece of clothing, a human-wearable item, a shoe, luggage, a purse, a wallet, and an airline ticket.

47. The storage medium of claim 45, wherein the object associated with a person comprises an object that has contacted the person.