Accession Number : ADP001538

Title :   An Instrument for Automated Measurement of the Angles of Cut of Doubly Rotated Quartz Crystals,

Corporate Author : ADVANCED RESEARCH AND APPLICATIONS CORP SUNNYVALE CA

Personal Author(s) : Chambers,John L.

Report Date : 1982

Pagination or Media Count : 13

Abstract : The development of an automated x-ray orientation system for accurate measurement of the angles of cut of doubly rotated quartz crystal plates is described. Our goal is to develop a prototype instrument capable of determining the conventional phi and theta angles to 4 arc-seconds reproducibility and 10 arc-seconds absolute accuracy for the SC-cut, and capable of measuring the general orientation of any cut on the bulk-wave zero-temperature-coefficient locus. Blanks are assumed to be pre-cut to within 15 minutes of the desired angles of cut. A prototype laser-assisted Laue diffractometer has been fabricated, and we are currently at the stage of evaluating and refining its performance. Currently the performance of the x-ray subsystem is as good as 2 arc-seconds. Recent improvements to the laser subsystem have brought its performance in line with that of the x-ray subsystem. When blanks are remounted between measurements, a precision of 3-4 arc-seconds standard deviation in phi and theta is observed for blanks with 3-5 micron surface finish.

Descriptors :   *Frequency, *Control, *Symposia, *Quartz, *Crystals, Cutting, Angles, Measurement, Rotation, Automation, Prototypes, Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE