On-line oil and foreign matter detection system and method employing hyperspectral imaging
A method for removing foreign matter from an agricultural product stream of a manufacturing process. The method includes conveying a product stream past an inspection station; scanning a region of the agricultural product stream as it passes the inspection station using at least one light source of a single or different wavelengths; generating hyperspectral images from the scanned region; determining a spectral fingerprint for the agricultural product stream from the hyperspectral images; comparing the spectral fingerprint obtained in step (c) to a spectral fingerprint database containing a plurality of fingerprints using a computer processor to determine whether foreign matter is present and, if present, generating a signal in response thereto; and removing a portion of the conveyed product stream in response to the signal. A system for detecting foreign matter within an agricultural product stream is also provided.
1. A method for detecting foreign matter from an agricultural product stream of a manufacturing process, the method comprising:
conveying a product stream past an inspection station;
scanning a region of the conveyed product stream as the region of the conveyed product stream passes the inspection station using at least one light source;
generating one or more hyperspectral images in real time from the scanned region;
determining a product fingerprint from the one or more hyperspectral images in real time;
comparing the product fingerprint in real time to a hyperspectral fingerprint database containing a plurality of hyperspectral fingerprints using a computer processor; and
determining whether foreign matter is present based on the comparing the product fingerprint in real time to the hyperspectral fingerprint database.
2. The method of claim 1 , further comprising:
causing a portion of the conveyed product stream to fall under the influence of gravity in a cascade.
3. The method of claim 2 , wherein the cascade is a turbulent cascade.
4. The method of claim 1 , further comprising:
removing a portion of the conveyed product stream in response to a determination that foreign matter is present.
5. The method of claim 4 , wherein the removing the portion of the conveyed product stream includes directing fluid under pressure at the portion of the conveyed product stream.
6. The method of claim 5 , wherein the fluid is a gas.
7. The method of claim 6 , wherein the gas is pressurized air.
8. The method of claim 1 , wherein the agricultural product is tobacco.
9. The method of claim 1 , wherein the agricultural product is tea.
10. The method of claim 1 , wherein the at least one light source is positioned to reduce an angle of incidence of each beam of light with the conveyed product stream.
11. The method of claim 1 , wherein the at least one light source includes a tungsten light source, a halogen light source, a xenon light source, a mercury light source, an ultraviolet light source, or any combination thereof.
12. The method of claim 1 , wherein the foreign matter is an oil or a lubricant.
13. A system for detecting foreign matter within an agricultural product stream, comprising:
an inspection station including,
at least one light source configured to provide a beam of light to scan a region of a product stream as it passes the inspection station, and
a hyperspectral camera system configured to provide a three dimensional hyperspectral image cube from the scanned region in real time; and
a computer processor configured to determine a product fingerprint from the hyperspectral image cube and to compare in real time the product fingerprint to a hyperspectral fingerprint database containing a plurality of hyperspectral fingerprints to determine whether foreign matter is present.
14. The system of claim 13 , further comprising:
at least one deflecting system responsive to signals obtained from said computer processor, the at least one deflecting system configured to remove a portion of the product stream in response to a determination of the computer processor that foreign matter is present in the product stream.
15. The system of claim 13 , further comprising:
at least one deflecting system responsive to signals obtained from the computer processor, the at least one deflecting system configured to direct fluid under pressure at a portion of the product stream in response to a determination of the computer processor that foreign matter is present in the product stream.
16. The system of claim 15 , wherein the fluid so directed is effective to remove the foreign matter.
17. The system of claim 15 , wherein the fluid is a gas.
18. The system of claim 17 , wherein the gas is air.
19. The system of claim 13 , wherein the agricultural product is tobacco.
20. The system of claim 13 , wherein the agricultural product is tea.
21. The system of claim 13 , wherein the at least one light source is positioned to reduce an angle of incidence of each beam of light with the conveyed product stream.
22. The system of claim 13 , wherein the at least one light source includes a tungsten light source, a halogen light source, a xenon light source, a mercury light source, an ultraviolet light source, or any combination thereof.
23. The system of claim 13 , wherein the foreign matter is an oil or a lubricant.