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A portable strain meter with continuous interferometric calibration

Blayney, J. L. and Gilman, Ralph (1965) A portable strain meter with continuous interferometric calibration. Bulletin of the Seismological Society of America, 55 (6). pp. 955-970. ISSN 0037-1106.

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A strain meter has been designed embodying techniques not used in earlier models. Minimum use of heavy and permanent auxiliary fixtures has made possible a portable instrument in which no components need be abandoned in order to change location. Provision for frequent or continuous interferometric calibration, and a photographic record therof, has provided uninterrupted strain measurements with long-term dependability. Also included is the usual continuous low-speed ink recorder for tidal and secular variations, and a high-gain band-pass recorder for the observation of long period waves and free oscillations of the earth. Details are given describing the method used for interpreting the interferometer image and its conversion to strain measurement.

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Additional Information:Copyright © 1965, by the Seismological Society of America. Manuscript received February 18, 1965. The authors wish to thank Lt. Commander Robert C. Munson, Mr. Robert A. Eppley, and Mr. Ron Viets, all members of the U. S. Coast and Geodetic Survey Honolulu Observatory staff, for their valuable suggestions and assistance relative to the installation and maintenance of the instrument. We are also grateful to Dr. Frank Press for his supervision of the project and, in addition, for his help in the actual assembly. Special thanks are due Mr. J. M. Nordquist for the computer program and mathematical analysis required in the preparation of the interferometric tables. This research was partially supported by National Science Foundation Grant No. GP-2806.
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Caltech Division of Geological Sciences1317
Issue or Number:6
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47857
Deposited By: George Porter
Deposited On:04 Aug 2014 14:59
Last Modified:03 Oct 2019 06:57

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