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1. (WO2017063935) SENSOR DEVICE AND METHOD FOR EXAMINING THE SURFACE OF A CYLINDRICAL CAVITY

Pub. No.:    WO/2017/063935    International Application No.:    PCT/EP2016/073844
Publication Date: Fri Apr 21 01:59:59 CEST 2017 International Filing Date: Fri Oct 07 01:59:59 CEST 2016
IPC: G01B 11/00
G01B 11/12
G01B 11/24
G01B 11/02
Applicants: STURM MASCHINEN- & ANLAGENBAU GMBH
Inventors: ULLRICH, Wolfgang
JANETZKI, Wolfgang
KLINGER, Philip
BADER, Florian
Title: SENSOR DEVICE AND METHOD FOR EXAMINING THE SURFACE OF A CYLINDRICAL CAVITY
Abstract:
The invention relates to a sensor device for examining the surface of a cylindrical cavity, comprising at least one sensor unit which is designed for an optical confocal distance measurement. The at least one sensor unit has an elongated shape and has an outer optical unit, by means of which a measuring direction in which light can be transmitted and received is transverse to a longitudinal axis of the sensor unit. The sensor device additionally comprises a movement device which is designed to retract and extend at least one sensor unit in a movement direction into and out of a cylindrical cavity to be examined. Control means are provided for measuring elevations of a surface of the cylindrical cavity, and the control means are designed to actuate at least one sensor unit in order to carry out a first distance measurement, during which the measuring direction is at an angle of 20° to 85° relative to the movement direction, and to actuate the at least one sensor unit in order to carry out a second distance measurement, during which the measuring direction is at an angle of 95° to 160° relative to the movement direction. For this purpose, the measuring direction of the at least one sensor unit can be at an angle between 95° and 175° relative to the longitudinal axis of the sensor unit, and the sensor unit is held by a rotatable mounting such that the same sensor unit can be moved into different rotational positions for the first distance measurement and the second distance measurement. Alternatively, the at least one sensor unit can comprise at least one first and a second sensor unit. The first sensor unit is designed and connected to the movement device such that the measuring direction of the first sensor unit is at an angle of 20° to 85° relative to the movement direction, and the second sensor unit is designed and connected to the movement device such that the measuring direction of the second sensor unit is at an angle of 95° to 160° relative to the movement direction. The invention additionally relates to a corresponding method.