System and method for grouping reflectance data

• US 6,894,772 B2
• Filed: 12/20/2001
• Issued: 05/17/2005
• Est. Priority Date: 02/12/2001
• Status: Active Grant

• Current Assignee: Malvern Panalytical, Inc.
• Original Assignee: Analytical Spectral Devices Incorporated (Malvern Panalytical, Inc.)
• Inventors: Curtiss, Brian, Goetz, Alexander, Faus, Robert J., Feldman, Leonid G.
• Primary Examiner(s): Smith, Zandra V.
• Assistant Examiner(s): Nguyen, Sang H.
• Application Number:
  US10/023,395
• Publication Number:
  US 20020108892A1
• Time in Patent Office: 1,244 Days
• Field of Search: 356/300, 356/326, 3562371-2374, 356/394, 250/339.07, 250/339.11, 250/223.R, 250/204.1, 250/223.2, 250/563, 209/589, 209/836, 209/535, 209/536, 438 86- 87, 438/125, 382/1, 382/8
• US Class Current: 356/237.1
• CPC Class Codes: B07C 5/342 according to optical properties, e.g. colour according to radiation transmittivity B07C5/3416
• CPC Class Codes: G01J 2003/2866 Markers; Calibrating of scan
• CPC Class Codes: G01N 21/274 Calibration, base line adjustment, drift correction
• CPC Class Codes: G01N 21/9508 Capsules; Tablets

Abstract

A method of identifying non-conforming groups of items within a package, the package containing a plurality of groups of items, comprises obtaining a reference signal corresponding to a package containing conforming groups of items, obtaining a signal corresponding to each of the plurality of groups of items in the package, comparing the signal corresponding to each of the plurality of groups of items with the reference signal, determining whether any of the plurality of groups of items is nonconforming, and segregating the package based on whether the package contains a nonconforming group of items.

Claims

1. A method of identifying non-conforming groups of items within a package, the package containing a plurality of groups of items, the method comprising:

obtaining a composite reference signal corresponding to a package containing conforming groups of items;

obtaining a composite signal corresponding to each of the plurality of groups of items in the package;

comparing the signal corresponding to each of the plurality of groups of items with the reference signal;

determining whether any of the plurality of groups of items is non-conforming; and

segregating the package based on whether the package contains a non-conforming group of items.

2. The method of claim 1, wherein the reference signal is a known value input by a user.

3. The method of claim 1, wherein the reference signal is obtained by performing a calibration run on a package containing conforming groups of items.

4. The method of claim 1, wherein the plurality of groups of items comprises individual columns of items aligned in the package.

5. The method of claim 1, wherein the plurality of groups of items comprises individual rows of items aligned in the package.

6. The method of claim 1, wherein the plurality of groups of items are arranged in a circular pattern.

7. The method of claim 1, wherein the plurality of groups of items are randomly placed within the package.

8. The method of claim 1, wherein the reference signal corresponds to a reflectance measurement.

9. The method of claim 1, wherein obtaining a signal corresponding to each of the plurality of groups of items in the package is accomplished by near infrared spectrographic analysis.

10. The method of claim 1, further comprising segregating the groups of items that are non-conforming from the groups of items that are conforming.

11. The method of claim 1, wherein determining whether any of the plurality of groups of items is non-conforming comprises:

computing an average reflectance signal based on the reflectance signals corresponding to each of the plurality of groups of items; and

comparing the average reflectance signal with the reference reflectance signal.

12. The method of claim 11, wherein computing an average reflectance signal comprises performing a first or second order differencing function.

13. The method of claim 11, wherein computing an average reflectance signal comprises performing a smoothing function.

14. The method of claim 1, wherein obtaining a composite signal corresponding to each of the plurality of groups of items in the package comprises:

obtaining an individual reflectance measurement for each item in each of the plurality of groups of items; and

combining the individual reflectance measurements for each of the plurality of groups of items.

15. A method of identifying non-conforming groups of items within a package, the package containing a plurality of groups of items, the method comprising:

obtaining a composite reference signal corresponding to a conforming package;

obtaining a composite signal corresponding to each of the plurality of groups of items in the package;

comparing the signal corresponding to each of the plurality of groups of items with the reference signal;

determining whether any of the plurality of groups of items is non-conforming; and

segregating the package based on whether the package contains a non-conforming group of items.

16. The method of claim 15, further comprising segregating the groups of items that contain a non-conforming item from the groups of items that do not contain a non-conforming item.

17. A method of identifying non-conforming groups of items within a package, the package containing a plurality of groups of items, the method comprising:

obtaining a reference signal corresponding to a package containing conforming groups of items;

obtaining a signal corresponding to each of the plurality of groups of items in the package;

comparing the signal corresponding to each of the plurality of groups of items with the reference signal;

determining whether any of the plurality of groups of items is non-conforming; and

segregating the package based on whether the package contains a non-conforming group of items,

wherein determining whether any of the plurality of groups of items is non-conforming comprises;

computing an average reflectance signal based on the reflectance signals corresponding to each of the plurality of groups of items; and

comparing the average reflectance signal with the reference signal.

18. The method of claim 17, wherein computing an average reflectance signal comprises performing a first or second order differencing function.

19. The method of claim 17, wherein computing an average reflectance signal comprises performing a smoothing function.