Illumination for optical scan and measurement

• US 8,841,603 B1
• Filed: 12/06/2013
• Issued: 09/23/2014
• Est. Priority Date: 08/28/2013
• Status: Expired due to Fees

• Current Assignee: Ethos-United-I LLC
• Original Assignee: United Sciences LLC
• Inventors: Hatzilias, Karol, Blanton, Keith A., Posey, Stefan T., Sharpe, Wess Eric
• Primary Examiner(s): Souw, Bernard E
• Application Number:
  US14/099,482
• Time in Patent Office: 291 Days
• Field of Search: 25055905-55908, 250/559.11, 250/559.13, 250/559.15, 250/559.33, 250/233, 250/234, 250/256, 250/261, 250/269.1, 250/265.266, 356/625, 356/626, 356/629, 356/639, 356/640, 356/256, 356/600, 356601-603, 356/607, 356/608
• US Class Current: 250/256
• CPC Class Codes: G01B 11/12 internal diameters
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures
• CPC Class Codes: G01B 11/2408 for measuring roundness
• CPC Class Codes: G01B 11/2518 Projection by scanning of the object
• CPC Class Codes: G01N 2021/0181 Memory or computer-assisted visual determination
• CPC Class Codes: G01N 21/01 Arrangements or apparatus for facilitating the optical investigation
• CPC Class Codes: G01N 21/55 Specular reflectivity
• CPC Class Codes: G01Q 10/00 Scanning or positioning arrangements, i.e. arrangements for actively controlling the movement or position of the probe
• CPC Class Codes: G02B 26/0875 by means of one or more refracting elements
• CPC Class Codes: G07C 3/143 Finished product quality control

Abstract

Optical scanning with an optical probe composed of an elongated cylinder of transparent material mounted upon an optical scanner body; one or more sources of scan illumination mounted in the probe distally or proximally with respect to the scanner body and projecting scan illumination longitudinally through the probe; a radially-reflecting optical element mounted in the probe having a conical mirror on a surface of the radially-reflecting optical element, the mirror oriented so as to project scan illumination radially away from a longitudinal axis of the probe with at least some of the scan illumination projected onto a scanned object; a lens mounted in the probe between the radially-reflecting optical element and the scanner body and disposed so as to conduct to an optical sensor scan illumination reflected from the scanned object.

Claims

1. Apparatus for optical scanning, the apparatus comprising:

an optical probe comprising an elongated cylinder of transparent material mounted upon an optical scanner body;

one or more sources of scan illumination mounted in the probe distally from the scanner body and projecting scan illumination longitudinally through the probe toward the scanner body;

a radially-reflecting optical element mounted in the probe between the sources of scan illumination and the scanner body, the radially-reflecting optical element comprising a conical mirror on a surface of the radially-reflecting optical element distal from the scanner body, the mirror oriented so as to project scan illumination radially away from a longitudinal axis of the probe with at least some of the scan illumination projected onto a scanned object;

a lens mounted in the probe between the radially-reflecting optical element and the scanner body and disposed so as to conduct to an optical sensor scan illumination reflected from the scanned object; and

the optical sensor mounted in the scanner body and disposed with respect to the lens so as to receive through the lens the scan illumination reflected from the scanned object.

2. The apparatus of claim 1 further comprising optical masking material disposed on the exterior of the probe so as to mask scan illumination noise.

3. The apparatus of claim 1 wherein the optical element further comprises a flat surface of optical glass proximal to the scanner body, the surface having optical masking material disposed on the surface so as to mask scan illumination noise.

4. The apparatus of claim 1 further comprising a heat sink mounted on an outer surface of the probe opposite the sources of scan illumination and a heat sink mounted on the outer surface of the probe adjacent to the scanner body.

5. The apparatus of claim 1 further comprising the optical sensor disposed within the optical scanner body so as to capture, from the scan illumination reflected from the scanned object, an image of at least a portion of the scanned object.

6. The apparatus of claim 1 further comprising a controller operatively coupled to the optical sensor, the controller configured to determine, from the scan illumination reflected from the scanned object, measurements of the scanned object.

7. The apparatus of claim 1 further comprising the optical scanner body configured for mounting upon an end effector of a robotic transport so that the probe is capable of movement by the robotic transport for optical scanning with respect to the scanned object, including both movement within the scanned object and movement with respect to the exterior of the scanned object.

8. The apparatus of claim 1 further comprising the optical scanner body configured to be hand held so that the probe is capable of movement by hand for optical scanning with respect to the scanned object, including both movement within the scanned object and movement with respect to the exterior of the scanned object.

9. The apparatus of claim 1 wherein:

the apparatus further comprises one or more supplemental sources of scan illumination mounted in the probe distally from the scanner body and projecting supplemental scan illumination radially away from a longitudinal axis of the probe so that the supplemental scan illumination strikes the scanned object at an angle that is different from the angle at which the radial illumination from the mirror strikes the scanned object;

the lens is further disposed so as to conduct to the optical sensor supplemental scan illumination reflected from the scanned object; and

the optical sensor is further disposed with respect to the lens so as to receive through the lens the supplemental scan illumination reflected from the scanned object.

10. The apparatus of claim 1 further comprising a radially-gathering optical element mounted in the probe between the radially-reflecting optical element and the lens, the radially-gathering optical element comprising a conical mirror on a surface of the radially-gathering optical element proximal to the lens, the conical mirror oriented so as to gather toward the lens scan illumination reflected from the scanned object.

11. The apparatus of claim 1 further comprising a controller operatively coupled to the optical sensor, the controller configured to determine, from the scan illumination reflected from the scanned object, measurements of the scanned object.

12. The apparatus of claim 1 further comprising the optical sensor disposed within the optical scanner body so as to capture, from the scan illumination reflected from the scanned object, an image of at least a portion of the scanned object.

13. Apparatus for optical scanning, the apparatus comprising:

an optical probe comprising an elongated cylinder of transparent material mounted upon an optical scanner body;

at least one source of scan illumination mounted on the probe proximally to the scanner body and disposed so as to project scan illumination distally through the probe away from the scanner body;

a radially-reflecting optical element mounted in the probe distally from the scanner body, the radially-reflecting optical element comprising a conical mirror on a surface of the radially-reflecting optical element proximal to the scanner body, the mirror oriented so as to project scan illumination radially away from a longitudinal axis of the probe with at least some of the scan illumination projected onto a scanned object;

a lens mounted in the probe between the radially-reflecting optical element and the scanner body and disposed so as to conduct to an optical sensor scan illumination reflected from the scanned object; and

the optical sensor mounted in the scanner body and disposed with respect to the lens so as to receive through the lens the scan illumination reflected from the scanned object.

14. The apparatus of claim 13 further comprising optical masking material disposed on the exterior of the probe so as to mask scan illumination noise.

15. The apparatus of claim 13 wherein:

the source of scan illumination is mounted on the exterior of the probe and disposed so as to project scan illumination at an angle with respect to a longitudinal axis of the probe; and

the conical mirror of the radially-reflecting optical element is an asymmetric conical mirror.

16. The apparatus of claim 13 further comprising the optical sensor disposed within the optical scanner body so as to capture, from the scan illumination reflected from the scanned object, an image of at least a portion of the scanned object.

17. The apparatus of claim 13 further comprising a controller operatively coupled to the optical sensor, the controller configured to determine, from the scan illumination reflected from the scanned object, measurements of the scanned object.

18. The apparatus of claim 13 further comprising:

the source of scan illumination mounted in the probe proximally to the scanner body and distally with respect to the lens and disposed so as to project scan illumination distally with respect to the lens and transversely through the probe to a mirror; and

the mirror disposed with respect to the source of scan illumination so as to reflect the scan illumination longitudinally through the probe away from the lens, away from the scanner body, and toward the radially-reflecting optical element.

19. The apparatus of claim 13 further comprising:

the source of scan illumination mounted in the probe proximally to the scanner body with respect to the lens and disposed so as to project scan illumination past the lens through an optical conductor;

a first mirror disposed with respect to the optical conductor so as to reflect the scan illumination distally with respect to the lens and transversely through the probe to a second mirror; and

the second mirror disposed with respect to the first mirror so as to reflect the scan illumination longitudinally through the probe away from the lens, away from the scanner body, and toward the radially-reflecting optical element.

20. The apparatus of claim 13 further comprising the optical scanner body configured for mounting upon an end effector of a robotic transport so that the probe is capable of movement by the robotic transport for optical scanning with respect to the scanned object, including both movement within the scanned object and movement with respect to the exterior of the scanned object.

21. The apparatus of claim 13 further comprising the optical scanner body configured to be hand held so that the probe is capable of movement by hand for optical scanning with respect to the scanned object, including both movement within the scanned object and movement with respect to the exterior of the scanned object.