Integrated spectrometer assembly and methods

• US 6,249,348 B1
• Filed: 12/23/1999
• Issued: 06/19/2001
• Est. Priority Date: 11/23/1998
• Status: Expired due to Term

• Current Assignee: JJL Technologies, L.L.C., RPX Corporation
• Original Assignee: LJ Laboratories L.L.C.
• Inventors: Jung, Wayne D., Jung, Russell W., Loudermilk, Alan R.
• Primary Examiner(s): EVANS, FANNIE L
• Application Number:
  US09/471,300
• Time in Patent Office: 544 Days
• Field of Search: 356/414, 356/416, 356/419, 356/71, 250/226, 359/891, 359/892, 257/432, 257/434, 257/435, 257/436, 257/440, 257/443, 257/444
• US Class Current: 356/419
• CPC Class Codes: G01J 1/0411 using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction
• CPC Class Codes: G01J 1/0437 using masks, aperture plates, spatial light modulators, spatial filters, e.g. reflective filters
• CPC Class Codes: G01J 1/0474 Diffusers cavities G01J2001/0481
• CPC Class Codes: G01J 1/06 Restricting the angle of incident light
• CPC Class Codes: G01J 1/44 Electric circuits for command of an exposure part G03B7/02
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0205 Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
• CPC Class Codes: G01J 3/0208 using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
• CPC Class Codes: G01J 3/0216 using light concentrators or collectors or condensers
• CPC Class Codes: G01J 3/0218 using optical fibers
• CPC Class Codes: G01J 3/0227 using notch filters
• CPC Class Codes: G01J 3/0229 using masks, aperture plates, spatial light modulators or spatial filters, e.g. reflective filters
• CPC Class Codes: G01J 3/0251 Colorimeters making use of an integrating sphere
• CPC Class Codes: G01J 3/0259 Monolithic
• CPC Class Codes: G01J 3/0264 Electrical interface; User interface
• CPC Class Codes: G01J 3/027 Control of working procedures of a spectrometer; Failure detection; Bandwidth calculation
• CPC Class Codes: G01J 3/0275 making use of sensor-related data, e.g. for identification of sensor parts or optical elements
• CPC Class Codes: G01J 3/0278 Control or determination of height or angle information for sensors or receivers
• CPC Class Codes: G01J 3/0283 using a charging unit
• CPC Class Codes: G01J 3/0291 Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements
• CPC Class Codes: G01J 3/10 : Arrangements of light sources specially adapted for spectrometry or colorimetry
• CPC Class Codes: G01J 3/2803 : using photoelectric array detector
• CPC Class Codes: G01J 3/46 : Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/463 : 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

Abstract

Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics preferably are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object/tooth being measured. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence, gloss and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention. A method of producing dental prostheses based on measured data also is disclosed. Measured data also may be stored and/or organized as part of a patient data base. Such methods and implements may be desirably utilized for purposes of detecting and preventing counterfeiting or the like. Low cost and small form factor spectrometers, and methods for manufacturing the same, also are disclosed.

Claims

1. A spectrometer assembly, comprising:

a substrate having thereon a plurality of optical sensors and one or more processing elements,

a plurality of filter elements fixedly positioned over at least a first group of the sensors and fixedly positioned with respect to the substrate, wherein the plurality of filter elements have spectral transmission characteristics over one or more predetermined spectral bands;

an optical imput unit comprising at least a randomized fiber optic bundle having at least one input comprising a plurality it of fibers and a plurality of outputs each comprising a plurality of fibers, wherein the fibers of the plurality of outputs receive light from fibers of the at least one input in a randomized pattern, wherein the plurality of outputs are fixedly positioned over at least certain of the plurality of filter elements and fixedly positioned with respect to the substrate, wherein light entering the input is transmitted to the plurality of outputs, wherein at least a portion of the light is transmitted form the outputs through at least certin of the filter elements and is sensed by at least certain of the sensors;

wherein light may be coupled to the input, wherein at least first spectral data corresponding to the light is generated by the one or more processing elements, wherein the spectrometer assembly is fabricated in a fixed manner with respect to the substrate.

2. The assembly of claim 1, wherein the sensors comprise sensors that generate at least one signal having a frequency proportional to the light intensity received by the one or more sensors.

3. The assembly of claim 2, wherein the at least one signal comprises a digital signal.

4. The assembly of claim 3, wherein the digital signal comprises a TTL or CMOS digital signal.

5. The assembly of claim 2, wherein one or more spectral characteristics are determined based on measuring a period of a plurality of digital signals produced by a plurality of sensors.

6. The assembly of claim 2, wherein the signal comprises an asynchronous signal of a frequency dependent upon the intensity of the received light.

7. The assembly of claim 2, wherein the one or more sensors comprise a plurality of light to frequency converter sensing elements.

8. The assembly of claim 1, wherein the filter elements comprise a plurality of filter portions havig a wavelength dependent optical transmission property.

9. The assembly of claim 1, wherein a spectral analysis is performed based on light received from an object or material.

10. The assembly of claim 1, wherein the filter elements comprise a plurality of cut-off filter elements.

11. The assembly of claim 1, wherein the filter elements collectively comprise a color gradient filter.

12. The assembly of claim 1, wherein the filter elements collectively comprise a filter grid.

14. The assembly of claim 1, wherein the light is received by a probe, wherein a plurality of measurements are taken at a plurality of distances of the probe with respect to the object or material.

15. The assembly of claim 1, wherein a probe having one or more light sources provides light to an object or material, wherein light from one or more light sources is received by one or more light receivers from the object or material.

16. The assembly of claim 15, wherein one or more sensors determine a distance of the probe with respect to the object or material.

17. The assembly of claim 15, wherein one or more sensors determine an angle of the probe with respect to the object or material.

18. The assembly of claim 15, wherein one or more sensors determine a distance and an angle of the probe with respect to the object or material.

19. The assembly of claim 2, wherein the at least one signal having a frequency proportional to the light intensity received by the one or more sensors is generated by an integrator coupled to the one or more sensors.

20. The assembly of claim 1, wherein the sensors comprise a photo diode array.

21. The assembly of claim 1, wherein the filter elements comprise one or more interference filters.

22. The assembly of claim 1, wherein the light is collimated prior to being sensed by the sensors.

23. The assembly of claim 22, wherein the light is collimated by an aspheric lens or lens assembly.

24. The assembly of claim 1, wherein the light is provided by one or more light sources to an object or material.

25. The assembly of claim 24, wherein characteristics of the object or material are determined.

26. The assembly of claim 25, wherein the characteristics comprise spectral characteristics.

27. The assembly of claim 25, wherein the characteristics comprise whether the object or material contains a predetermined material.

28. The assembly of claim 25, wherein a determination is made if the object or material is genuine.

29. The assembly of claim 24, wherein the object or material comprises a gaseous material, a non-gaseous material, skin, non-skin body tissue, paint, fabric, a photograph, a dental object, a printed object, hair, or makeup.

30. The assembly of claim 1, further comprising a bias light source, wherein the bias light source provides bias light to at least certain of the sensors.

31. The assembly of claim 1, further comprising a probe providing light to a surface of an object or material and receiving light from the object or matrial, wherein light is provided from the probe by at least one light source and light is received by one or more light receivers, wherein the light source and one or more of the light receivers define a critical height from the surface below which no light from the light source that is specularly reflected from the object or material is received by the one or more of the light receivers.

32. The assembly of claim 31, wherein the assembly takes at least one measurement with the probe below the critical height for one or more of the light receivers.

13. The assembly of clim 1, wherein received light is spectrally analyzed without using a diffraction grating.