Two-dimensional scanner apparatus
Abstract
An X-Y scanner utilizes an eddy current or ultrasonic current test probe to detect surface defects in small flat plates and the like. The apparatus includes a scanner which travels on a pair of slide tubes in the X-direction. The scanner, carried on a carriage which slides in the Y-direction, is driven by a helix shaft with a closed-loop helix groove in which a follower pin carried by scanner rides. The carriage is moved incrementally in the Y-direction upon the completion of travel of the scanner back and forth in the X-direction by means of an indexing actuator and an indexing gear. The actuator is in the form of a ratchet which engages ratchet gear upon return of the scanner to the indexing position. The indexing gear is rotated a predetermined increment along a crack gear to move carriage incrementally in the Y-direction. Thus, simplified highly responsive mechanical motion may be had in a small lightweight portable unit for accurate scanning of small area.
- Publication:
-
NASA Marshall Space Flight Center Report
- Pub Date:
- March 1984
- Bibcode:
- 1984msfc.rept.....K
- Keywords:
-
- Electromechanical Devices;
- Flat Plates;
- Portable Equipment;
- Scanners;
- Ultrasonic Flaw Detection;
- Actuators;
- Bearing (Direction);
- Gears;
- Oscilloscopes;
- Patents;
- Potentiometers (Instruments);
- Instrumentation and Photography