Techniques for measuring quasistatic geophysical perturbations with gravitational-wave laser interferometers are studied. The transfer function for this kind of apparatus with destructive interference (the dark spot regime) is calculated taking the natural asymmetry of the lengths of the arms of the Fabry–Perot optical cavities into account. Equations are derived for estimating the modulation in the power of the output signal at the photon circulation frequency in the arms of the interferometer owing to geophysical perturbations. These estimates are compared with observations on the LIGO interferometer.
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This work was supported by the Russian Foundation for Basic Research (Grant 08-02-000941).
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Translated from Izmeritel’naya Tekhnika, No. 6, pp. 3–7, June, 2011.
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Gusev, A.V., Rudenko, V.N. & Yudin, I.S. Detection of slow geophysical perturbations in gravitational-wave interferometers. Meas Tech 54, 585–592 (2011). https://doi.org/10.1007/s11018-011-9770-4
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DOI: https://doi.org/10.1007/s11018-011-9770-4