Vaisala comparator

Vaisala comparator

[¦vī·sə·lə kəm′par·əd·ər]
(optics)
An interferometer measuring distances on the order of 100 meters with accuracies on the order of 1 part in 107
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.