Remote color measurement device

• US 4,881,811 A
• Filed: 02/16/1988
• Issued: 11/21/1989
• Est. Priority Date: 02/16/1988
• Status: Expired due to Term

• Current Assignee: X-Rite Incorporated (Danaher Corporation)
• Original Assignee: Colorgen, Inc. (Danaher Corporation)
• Inventors: O'Brien, John K.
• Primary Examiner(s): EVANS, FANNIE L
• Application Number:
  US07/156,471
• Time in Patent Office: 644 Days
• Field of Search: 356/300, 356/319, 356/323, 356/325, 356/326, 356/328, 356/236, 356/73, 356/434, 356/446, 356/448, 250/227, 250/226, 250/228
• US Class Current: 356/323
• CPC Class Codes: A61C 19/10 Supports for artificial teeth for transport or for comparison of the colour
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0218 using optical fibers
• CPC Class Codes: G01J 3/0251 Colorimeters making use of an integrating sphere
• CPC Class Codes: G01J 3/08 Beam switching arrangements
• CPC Class Codes: G01J 3/46 Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/502 using a dispersive element, e.g. grating, prism
• CPC Class Codes: G01J 3/508 measuring the colour of teeth
• CPC Class Codes: G01J 3/524 Calibration of colorimeters
• CPC Class Codes: G01N 2021/4742 comprising optical fibres
• CPC Class Codes: G01N 2021/4752 Geometry
• CPC Class Codes: G01N 21/255 Details, e.g. use of specially adapted sources, lighting or optical systems
• CPC Class Codes: G01N 2201/065 Integrating spheres
• CPC Class Codes: G01N 2201/084 Fibres for remote transmission

Abstract

A probe, for use with a spectrophotometer, which senses the reflectance of a sample remote from the spectrophotometer. The probe includes a housing having a probe portion positionable proximate the sample, and an integrating chamber disposed within the probe housing and having a radiation input port, a sample port for passing diffused radiation to the sample and returning reflected radiation from the sample, a reference port, and an exit port to receive radiation reflected from the sample through the sample port. The probe further includes a guide for directing radiation to the radiation input port from a radiation source, and an element, responsive to the exit port and the reference port, for selectively conveying reflected radiation from the sample and the wall of the integrating chamber in the probe to the remote spectrophotometer.

Claims

1. A probe, for use with a spectrophotometer, for sensing the reflectance of a sample remote from the spectrophotometer, comprising:

A probe housing having a probe portion positionable proximate the sample;

an integrating chamber for diffusing radiation disposed within said probe housing and having a radiation input port for providing radiation to said integrating chamber, a sample port for passing diffused radiation to the sample and returning reflected radiation from the sample, a reference port for receiving diffused radiation directly from the chamber, and an exit port to receive radiation reflected from the sample through said sample port;

an output port for receiving reflected sample radiation from said sample and diffused radiation directly from the chamber and for transmitting the received radiation to the remote spectrophotometer;

a guide for directing radiation to said radiation input port from a radiation source; and

means for selectively directing the diffused radiation from the chamber through said reference port and the radiation reflected from the sample through said exit port to said output port.

2. The probe of claim 1 in which said sample port includes a passage extending between said integrating chamber and the outer surface of said probe portion.

3. The probe of claim 2 in which said probe portion is tapered toward said passage.

4. The probe of claim 1 in which said integrating chamber includes a baffle positioned proximate said radiation input port to assist diffusion within said integrating chamber of radiation from said source.

5. The probe of claim 4 in which said baffle is coated with reflective material.

6. The probe of claim 1 in which said integrating chamber is spherical.

7. The probe of claim 1 in which said means for selectively directing includes mirror means and means for realigning said mirror means relative to said reference port and said exit port.

8. The probe of claim 7 in which said means for realigning includes solenoid means connected to said mirror means.

9. The probe of claim 7 in which said exit port includes an aperture stop for directing reflected radiation onto said mirror means.

10. The probe of claim 7 in which said means for selectively directing further includes a radiation guide segment for conducting radiation from said reference port to said mirror means.

11. The probe of claim 7 in which said mirror means is disposed within said housing.

12. The probe of claim 11 in which said housing includes a mirror chamber for accommodating said mirror means.

13. The probe of claim 1 in which said means for selectively directing includes a reflected radiation guide for conducting radiation from the sample and a wall of the integrating chamber to the spectrophotometer.

14. The probe of claim 1 in which said housing includes a handle portion graspable by a human hand.

15. The probe of claim 1 further including an extension for directing radiation through the sample into said sample port, said extension defining a gap between it and said sample port in which the sample is positionable.

16. The probe of claim 15 further including means for selectively switching radiation in said guide from said radiation source to said extension.

17. A probe, for use with a spectrophotometer, for sensing the reflectance of a sample remote from the spectrophotometer, comprising:

a probe housing having a probe portion positionable proximate the sample;

an integrating chamber for diffusing radiation disposed within said probe housing and having a radiation input port for providing radiation to said chamber, a sample port for passing diffused radiation to the sample and returning reflected radiation from the sample, a reference port for receiving diffused radiation directly from said chamber, and an exit port to receive radiation reflected from the sample through said sample port;

an output port for receiving reflected radiation from said sample and diffused radiation from the chamber and for transmitting the received radiation to the remote spectrophotometer;

a guide for directing radiation to said radiation input port from a radiation source; and

means for selectively conveying reflected radiation from the sample and from a wall of the integrating chamber in the probe to the remote spectrophotometer through a reflected-radiation guide, said means for selectively conveying including mirror means and means for realigning said mirror means relative to said exit portion and said reference port to selectively provide reflected radiation from the sample and the wall to said reflected-radiation guide.

18. A probe for use with a spectrophotometer for sensing the reflectance of a sample remote from the spectrophotometer, said probe comprising:

a probe housing having a probe portion positionable proximate the sample;

a source of input radiation;

an integration chamber disposed within said probe housing for receiving and diffusing said input radiation;

a sample port for delivering diffused input radiation to said sample;

an output port; and

means for selectively directing to said output port said diffused input radiation reflected from said sample and the diffused input radiation reflected directly from said integration chamber.

19. The probe of claim 18 in which said means for selectively directing includes mirror means and means for realigning said mirror means relative to radiation reflected from said sample and diffused radiation from said integration chamber.

20. The probe of claim 19 in which said means for directing includes an exit port for passing radiation reflected from said sample to said mirror means.

21. The probe of claim 19 in which said means for directing includes a reference port for receiving and directing diffused radiation from the chamber to said mirror means.

22. The probe of claim 21 in which said means for selectively directing further includes a radiation guide segment for conducting radiation from said reference port to said mirror means.