Highly sensitive wideband seismometer using a laser interferometer
作者:
Akito Araya,
Keita Kawabe,
Toshikazu Sato,
Norikatsu Mio,
Kimio Tsubono,
期刊:
Review of Scientific Instruments
(AIP Available online 1993)
卷期:
Volume 64,
issue 5
页码: 1337-1341
ISSN:0034-6748
年代: 1993
DOI:10.1063/1.1144089
出版商: AIP
数据来源: AIP
摘要:
A wideband (dc to 2 kHz) highly sensitive seismometer using a Michelson laser interferometer has been developed. The horizontal acceleration of the ground is sensed by a suspended mirror; its position is then detected as the fringe signal of the light in the interferometer. The minimum measurable displacement with this seismometer is 3×10−11m/&sqrt;Hz at 1 Hz (limited by the thermal fluctuation of air and the frequency noise of the laser) and 2×10−15m/&sqrt;Hz above 2 kHz (limited by the shot noise of the light). One application of this seismometer is to use it for very sensitive vibration measurements, such as in seismic noise investigations of possible sites for a large‐scale laser‐interferometric gravitational wave detector.
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