Interferometric calibration of a strainmeter transducer
1971 ◽
Vol 61
(4)
◽
pp. 937-955
Keyword(s):
abstract A capacitive-strainmeter transducer is calibrated using a variable-spacing, Fabry-Perot interferometer. Optical flats are mounted on a spring parallelogram. Thermal expansion of a steel tube deforms the parallelogram, smoothly displacing one of the optical flats. This modulates the intensity of the 5016 àline, observed at the central zone of the interference pattern, and thus produces sharp peaks on a pen recorder. A theoretical analysis of the peak width, based on the work of Chabbal (1958), agrees with that recorded by the interferometer. This calibration permits earth-strain measurements to an accuracy of 1 per cent.
2013 ◽
Vol 652-654
◽
pp. 677-682
Keyword(s):
2013 ◽
Vol 19
(5)
◽
pp. 1-8
◽
2016 ◽
Vol 851
◽
pp. 739-744