Method for measuring surface properties and co-ordinate measuring device

• US 20040174537A1
• Filed: 12/29/2003
• Published: 09/09/2004
• Est. Priority Date: 07/16/2001
• Status: Active Grant

• Current Assignee: Werth Messtechnik GmbH
• Original Assignee: Werth Messtechnik GmbH
• Inventors: Ferger, Detlef
• Granted Patent: US 7,227,647 B2
• Time in Patent Office: Days
• US Class Current: 356/601
• CPC Class Codes: G01B 11/303 using photoelectric detection means
• CPC Class Codes: G01B 21/04 by measuring coordinates of points
• CPC Class Codes: G01B 21/30 for measuring roughness or irregularity of surfaces
• CPC Class Codes: G01B 5/285 for controlling eveness

Abstract

The aim of the invention is to measure the surface properties of a workpiece in an extremely precise manner by means of a co-ordinate measuring device (10), independently from the material properties of said workpiece. To this end, the inventive method involves a moulded probe element (30) which can be displaced along co-ordinate axes (X, Y, Z), and an optical sensor (32) detecting the movement of said probe element on the surface of the workpiece. The optical sensor (32) is an optoelectronic distance sensor, and the moulded probe element (30) is displaceably arranged in relation to the distance sensor in such a way that said distance sensor optionally directly measures the surface, or the position of the moulded probe element.

Claims

1. Method for measuring surface properties of a work-piece using a coordinate measuring device including a scanning molded element supported on the surface and movable relative to this whose position either directly is recorded with an optical sensor, or a position of at least one mark directly allocated to the scanning molded element is recorded with an optical sensor,

thereby characterized by an optical-electronic scanning sensor being used as the optical sensor with which electively the surface properties can be directly measured, or with which the position of the scanning element or the mark allocated to this is indirectly or directly measured.

2. Method according to claim 1, thereby characterized by a scanning needle being used as a scanning molded element.

3. Method according to claim 1 or 2, thereby characterized by a fiber scanner operating in an optical-tactile manner being used as a scanning element.

4. Method according to at least one of the preceding claims, thereby characterized by the scanning sensor being used as illumination for the fiber scanner, when an optical-tactile operating fiber scanner is used.

6. Method according to at least one of the preceding claims, thereby characterized by an image-processing sensor being combined with the ranging sensor.

7. Method according to at least one of the preceding claims, thereby characterized by the scanning molded element being positioned in the beam path of the ranging sensor or being removed from it by means of an alternate interface.

8. Method according to at least one of the preceding claims, thereby characterized by that being used as the alternate interface which is utilized for a scanning system present in the coordinate measuring device.

5. Method according to at least one of the proceeding claims, thereby characterized by a ranging scanner operating according to the video autofocus method, the laser autofocus method or the Foucault cutting principle being used.

9. Coordinate measuring device (10) for measuring surface properties of a work-piece (34) including a scanning molded element (30, 44) movable along coordinate axes (X, Y, Z) of the coordinates measuring device as well as the optical sensor recording its motion on the surface (36, 38, 58, 60) of the work-piece, thereby characterized by the optical sensor (32, 48) being an optical-electronic ranging sensor and the ranging molded element (30, 44) being arranged in an adjustable manner in relation to the ranging sensor such that this electively measures the surface (36, 38, 58, 60) directly or measures the position of the scanning molded element.

10. Coordinate measuring device according to claim 9, thereby characterized by the scanning element (30, 44) being a scanning needle (56).

11. Coordinate measuring device according to claim 9 or 10, thereby characterized by the scanning molded element (30, 44) being a fiber scanner operating in an optical-tactile manner.

12. Coordinate measuring device according to one of claims 9 to 11, thereby characterized by the optical-electronic ranging sensor (32, 48) being a sensor operating according to the laser autofocus method, the video autofocus method or the Foucault cutting principle.

13. Coordinate measuring device according to one of claims 9 to 12, thereby characterized by the coordinate measuring device (10) having an image processing sensor (46) which, if need be, is combined with a ranging sensor (32, 48).

14. Coordinate measuring device according to one of claims 9 to 13, thereby characterized by the ranging sensor (32, 48) being illumination for the optical-tactile operating fiber scanner.

15. Coordinate measuring device according to one of claims 9 to 14, thereby characterized by the scanning element (30, 44) being adjustable by means of an alternative interface.

16. Coordinate measuring device according to one of claims 9 to 15, thereby characterized by the alternate interface (30) being an alternate interface used for existing scanning systems in the coordinate measuring device (10).