System for in-situ detection of plant exposure to trichloroethylene (TCE)

• US 8,564,770 B1
• Filed: 06/01/2011
• Issued: 10/22/2013
• Est. Priority Date: 06/01/2011
• Status: Active Grant

• Current Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Original Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Inventors: Lewis, Mark David, Anderson, Daniel J., Newman, Lee A., Keith, Amy G.
• Primary Examiner(s): Toatley, Gregory J
• Assistant Examiner(s): DECENZO, SHAWN H
• Application Number:
  US13/150,832
• Time in Patent Office: 874 Days
• Field of Search: 356/303, 356402-425
• US Class Current: 356/303
• CPC Class Codes: G01J 3/42 Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry beam switching arrangements G01J3/08
• CPC Class Codes: G01N 2021/8466 Investigation of vegetal material, e.g. leaves, plants, fruits
• CPC Class Codes: G01N 21/31 Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry G01N21/72 takes precedence
• CPC Class Codes: G01N 2201/0221 Portable; cableless; compact; hand-held

Abstract

A system detects a plant'"'"'s exposure to trichloroethylene (TCE) through plant leaf imaging. White light impinging upon a plant'"'"'s leaf interacts therewith to produce interacted light. A detector is positioned to detect at least one spectral band of the interacted light. A processor coupled to the detector performs comparisons between photonic energy of the interacted light at the one or more spectral bands thereof and reference data defining spectral responses indicative of leaf exposure to TCE. An output device coupled to the processor provides indications of the comparisons.

Claims

1. A system for detecting a plant'"'"'s exposure to trichloroethylene (TCE), comprising:

a source of white light wherein said white light is adapted to impinge upon a plant'"'"'s leaf for interaction therewith, and wherein said interaction produces interacted light;

a light detector positioned to detect at least one spectral band of said interacted light, wherein said at least one spectral band is from the 400-1000 nanometer spectra of wavelengths;

a processor coupled to said light detector for performing comparisons between photonic energy of said interacted light at said at least one spectral band thereof and reference data defining spectral responses indicative of plant exposure to TCE; and

an output device coupled to said processor for providing indications of said comparisons.

2. A system as in claim 1, further comprising a housing supporting said source of white light and said light detector, said housing adapted to position said source of white light and said light detector on one side of the plant'"'"'s leaf.

3. A system as in claim 1, further comprising a housing supporting said source of white light and said light detector, said housing adapted to position said source of white light and said light detector on opposing sides of the plant'"'"'s leaf.

4. A system as in claim 1, further comprising a hand-held housing supporting said source of white light and said light detector.

5. A system as in claim 1, wherein said source of white light is a naturally occurring source.

6. A system as in claim 1, wherein said source of white light is a man-made source.

7. A system as in claim 1, wherein said output device provides at least one of a visual output and an audio output.

8. A system as in claim 1, wherein said light detector includes:

a spectrograph for separating said interacted light into said at least one spectral band thereof; and

a camera coupled to said spectrograph for measuring said photonic energy of said interacted light at each said at least one spectral band thereof.

9. A system for detecting plant exposure to trichloroethylene (TCE), comprising:

a source of white light wherein said white light is adapted to impinge upon a plant'"'"'s leaf for interaction therewith, and wherein said interaction produces interacted light;

a light detector positioned to detect at least one spectral band of said interacted light, wherein said at least one spectral band is from the 400-1000 nanometer spectra of wavelengths;

a hand-held housing supporting said source of white light and said light detector, said hand-held housing adapted to position said source of white light and said light detector on one side of the plant'"'"'s leaf;

a processor coupled to said light detector for performing comparisons between photonic energy of said interacted light at said at least one spectral band thereof and reference data defining spectral responses indicative of plant exposure to TCE; and

an output device coupled to said processor for providing indications of said comparisons.

10. A system as in claim 9, wherein said source of white light is a naturally occurring source.

11. A system as in claim 9, wherein said source of white light is a man-made source.

12. A system as in claim 9, wherein said output device provides at least one of a visual output and an audio output.

13. A system as in claim 9, wherein said light detector includes:

a spectrograph for separating said interacted light into said at least one spectral band thereof; and

a camera coupled to said spectrograph for measuring said photonic energy of said interacted light at each said at least one spectral band thereof.

14. A system for detecting the presence of trichloroethylene (TCE) in plant leaves, comprising:

a source of white light wherein said white light is adapted to impinge upon a plant'"'"'s leaf for interaction therewith, and wherein said interaction produces interacted light;

a spectrograph for separating said interacted light into said at least one spectral band thereof, wherein said at least one spectral band is from the 400-1000 nanometer spectra of wavelengths;

a camera coupled to said spectrograph for measuring photonic energy of said interacted light at each said at least one spectral band thereof;

a processor coupled to said camera for performing comparisons between photonic energy of said interacted light at said at least one spectral band thereof and reference data defining spectral responses indicative of plant exposure to TCE; and

an output device coupled to said processor for providing at least one of visual indications and audible indications of said comparisons.

15. A system as in claim 14, further comprising a housing supporting said source of white light and said light detector, said housing adapted to position said source of white light and said light detector on one side of the plant'"'"'s leaf.

16. A system as in claim 14, further comprising a housing supporting said source of white light and said light detector, said housing adapted to position said source of white light and said light detector on opposing sides of the plant'"'"'s leaf.

17. A system as in claim 14, further comprising a hand-held housing supporting said source of white light and said light detector.

18. A system as in claim 14, wherein said source of white light is a naturally occurring source.

19. A system as in claim 14, wherein said source of white light is a man-made source.