TITLE

Highly sensitive wideband seismometer using a laser interferometer

AUTHOR(S)
Araya, Akito; Kawabe, Keita; Sato, Toshikazu; Mio, Norikatsu; Tsubono, Kimio
PUB. DATE
May 1993
SOURCE
Review of Scientific Instruments;May93, Vol. 64 Issue 5, p1337
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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[sup -11] m/ √Hz at 1 Hz (limited by the thermal fluctuation of air and the frequency noise of the laser) and 2 × 10[sup -15] m/ √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.
ACCESSION #
9785791

 

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