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Sensors 2017, 17(10), 2423; doi:10.3390/s17102423

Laser-Interferometric Broadband Seismometer for Epicenter Location Estimation

Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea
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Received: 30 August 2017 / Revised: 27 September 2017 / Accepted: 5 October 2017 / Published: 23 October 2017
(This article belongs to the Special Issue Innovative Smart Sensors for Control Systems)
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Abstract

In this paper, we suggest a seismic signal measurement system that uses a laser interferometer. The heterodyne laser interferometer is used as a seismometer due to its high accuracy and robustness. Seismic data measured by the laser interferometer is used to analyze crucial earthquake characteristics. To measure P-S time more precisely, the short time Fourier transform and instantaneous frequency estimation methods are applied to the intensity signal ( I y ) of the laser interferometer. To estimate the epicenter location, the range difference of arrival algorithm is applied with the P-S time result. The linear matrix equation of the epicenter localization can be derived using P-S time data obtained from more than three observatories. We prove the performance of the proposed algorithm through simulation and experimental results. View Full-Text
Keywords: seismic wave; laser interferometer; epicenter localization; STA/LTA; range difference of arrival seismic wave; laser interferometer; epicenter localization; STA/LTA; range difference of arrival
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Lee, K.; Kwon, H.; You, K. Laser-Interferometric Broadband Seismometer for Epicenter Location Estimation. Sensors 2017, 17, 2423.

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