The use of a laser extensometer to observe strain in a large ground sample

Autor:	V. Vali, R. C. Bostrom
Rok vydání:	1968
Předmět:	Physics business.industry Dynamic range Phase (waves) Strainmeter Amplitude distortion Laser law.invention Geophysics Optics Geochemistry and Petrology law Hertz Range (statistics) Computers in Earth Sciences business Extensometer
Zdroj:	Bulletin géodésique. 88:151-157
ISSN:	0007-4632
DOI:	10.1007/bf02525652
Popis:	The design and construction are described of an experimental strainmeter. This observes changes in the number of waves of light standing in a one-kilometer gap between points on the earth’s surface. Strain is observed over a frequency range of zero to several hundred hertz, to an accuracy of an arbitrarily-small fraction of a wave-length of light. Frequency-dependent phase and amplitude distortion are absent. As the read-out is of the nature of a servo device, dynamic range limitations are not encountered.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a514d535245e0421f602aaa34fe94835 https://doi.org/10.1007/bf02525652 Zobrazit plný text záznamu Full text from SpringerLink