Miniaturized system and method for measuring optical characteristics

• US 7,768,644 B2
• Filed: 04/01/2009
• Issued: 08/03/2010
• Est. Priority Date: 02/21/2002
• Status: Active Grant

• Current Assignee: Vita Zahnfabrik H. Rauter GMBH & Co.. KG (Rauter Beteiligungsgesellschaft mbH)
• Original Assignee: Vita Zahnfabrik H. Rauter GMBH & Co.. KG (Rauter Beteiligungsgesellschaft mbH)
• Inventors: Jung, Russell W., Loudermilk, Alan R., Sloan, Walter W., Jung, Wayne D.
• Primary Examiner(s): LAUCHMAN, LAYLA G
• Application Number:
  US12/416,714
• Publication Number:
  US 20090190133A1
• Time in Patent Office: 489 Days
• Field of Search: 356/402, 356/405, 356/73
• US Class Current: 356/402
• CPC Class Codes: A61C 19/04 Measuring instruments specially adapted for dentistry A61C5/44 takes precedence; testing vitality of teeth A61B5/0534; radiation diagnosis specially adapted for dentistry A61B6/51
• CPC Class Codes: G01J 1/0271 Housings; Attachments or accessories for photometers
• CPC Class Codes: G01J 2003/466 Coded colour; Recognition of predetermined colour; Determining proximity to predetermined colour
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0218 using optical fibers
• CPC Class Codes: G01J 3/0256 Compact construction
• CPC Class Codes: G01J 3/0264 Electrical interface; User interface
• CPC Class Codes: G01J 3/0272 Handheld
• CPC Class Codes: G01J 3/0278 Control or determination of height or angle information for sensors or receivers
• CPC Class Codes: G01J 3/0291 Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements
• CPC Class Codes: G01J 3/0294 Multi-channel spectroscopy
• CPC Class Codes: G01J 3/36 Investigating two or more bands of a spectrum by separate detectors
• CPC Class Codes: G01J 3/46 Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/462 Computing operations in or between colour spaces; Colour management systems
• CPC Class Codes: G01J 3/463 Colour matching
• CPC Class Codes: G01J 3/508 measuring the colour of teeth
• CPC Class Codes: G01J 3/51 using colour filters
• CPC Class Codes: G01J 3/513 having fixed filter-detector pairs
• CPC Class Codes: G01J 3/524 Calibration of colorimeters
• CPC Class Codes: G01N 21/25 Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
• CPC Class Codes: G01N 21/57 : Measuring gloss

Abstract

A miniaturized spectrometer/spectrophotometer system and methods are disclosed. A probe tip including one or more light sources and a plurality of light receivers is provided. A first spectrometer system receives light from a first set of the plurality of light receivers. A second spectrometer system receives light from a second set of the plurality of light receivers. A processor, wherein the processor receives data generated by the first spectrometer system and the second spectrometer system, wherein an optical measurement of a sample under test is produced based on the data generated by the first and second spectrometer systems.

Claims

1. A method for determining optical characteristics of an object comprising:

storing a plurality of optical property parameters for each of a plurality of shades;

storing a plurality of weight factors for each of the stored plurality of optical property parameters, wherein each of the stored plurality of optical property parameters is associated with a weight factor depending on a material type of said object;

receiving the material type of said object from a user;

measuring optical properties of the object with an instrument;

comparing the measured optical properties of the object to the stored optical property parameters for each shade;

determining one or more shade match candidates according to the comparing, the received material type of said object, and the corresponding stored weight factors; and

displaying the one or more shade match candidates.

2. The method of claim 1, further comprising displaying an indication of which of the displayed one or more shade match candidates is a best match.

3. The method of claim 1, wherein the optical property parameters comprise one or more of the group consisting of color tristimulus values, tristimulus values of L, a and b, an integral intensity of a calculated spectrum, three values representing color information for the object and an integral intensity of a calculated spectrum, and three values representing color information for the object and a degree of curvature of a calculated spectrum.

4. The method of claim 1, further comprising capturing an image of the object and displaying additional color information according to measuring optical properties of the object superimposed on the captured image of the object.

5. The method of claim 1, wherein each of the plurality of optical property parameters includes a preferred value, and wherein comparing the measured optical property parameters further comprises summing differences between the measured plurality of optical property parameters and the preferred values for the stored plurality of optical property parameters.

6. The method of claim 1, wherein the measuring is performed in a plurality of regions of the object, and wherein the one or more shade match candidates are determined for each of the plurality of regions of the object.

7. The method of claim 1, further comprising displaying additional color information according to measuring optical properties of the object.

8. The method of claim 7, wherein the displayed information includes a difference in value of the optical property parameters for the one or more shade match candidates and the stored optical property parameters for each of the plurality of shades.

9. The method of claim 7, wherein the displayed information includes differences in value and chroma of the optical property parameters for the one or more shade match candidates and the stored optical property parameters for each of the plurality of shades.

10. The method of claim 7, wherein the displayed information includes differences in value, chroma and hue of the optical property parameters for the one or more shade match candidates and the stored optical property parameters for each of the plurality of shades.

11. The method of claim 1, wherein the comparing comprises comparing a portion of the measured optical properties of the object to a portion of the stored optical property parameters for each shade according to the received material type of said object.

12. The method of claim 1, further comprising displaying a visual indicator to indicate a degree of closeness for each of the one or more shade match candidates.

13. The method of claim 1, wherein the object is a tooth.

14. The method of claim 1, wherein the object is a restoration.

15. A system for determining optical characteristics of an object comprising:

a memory for storing a plurality of optical property parameters for each of a plurality of shades, and for storing a plurality of weight factors for each of the stored plurality of optical property parameters, wherein each of the stored plurality of optical property parameters is associated with a weight factor depending on a material type of said object;

an input device for receiving the material type of said object from a user;

an optical measurement unit for measuring optical properties of the object;

a processor for comparing the measured optical properties of the object to the stored optical property parameters for each shade, and for determining one or more shade match candidates according to the comparing, the received material type of said object, and the corresponding stored weight factors; and

a display for displaying the one or more shade match candidates.

16. The system of claim 15, wherein the display further displays an indication of which of the displayed one or more shade match candidates is a best match.

17. The system of claim 15, wherein the optical measurement unit comprises of a first spectrometer and a second spectrometer for receiving said optical properties of the object, and wherein different weight factors are associated with each of the first and second spectrometer depending on the received material type of said object.

18. The system of claim 15, wherein the optical property parameters comprise one or more of the group consisting of color tristimulus values, tristimulus values of L, a and b, an integral intensity of a calculated spectrum, three values representing color information for the object and an integral intensity of a calculated spectrum, and three values representing color information for the object and a degree of curvature of a calculated spectrum.

19. A method for determining optical characteristics of an object, the objected being formed of a material type, the method comprising:

storing a plurality of optical property parameters for a plurality of material types;

measuring optical properties of the object with a plurality of spectrometers;

comparing the measured optical properties of the object to the stored optical property parameters for material type;

determining a material type for the object according to the comparing and the corresponding stored optical property parameters; and

displaying the determined material type of the object.

20. The method of claim 19, wherein the object is a tooth or a restoration.