Traceable calibration of a broadband seismometer down to 5 mHz

Shimoda, T.; Kokuyama, Wataru; Nozato, Hideaki

doi:10.1088/1361-6501/ac9077

Cited by 4 publications

(1 citation statement)

References 10 publications

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“…The microvibration calibration is also necessary for ultra-low frequency vibration calibrations below 0.1 Hz, in which the excitation amplitude is small due to the limited stroke of the vibration exciter. Such a ultra-low frequency calibration is necessary for the broadband seismometer [15][16][17][18]. Thus, the microvibration calibration technology helps in enhancing the vibration standard ranges for many vibration measurement applications below 100 Hz.…”

Section: Introductionmentioning

confidence: 99%

Primary microvibration standards down to 10⁻³ m s⁻² at low frequency

Shimoda¹,

Kokuyama²,

Nozato³

2023

Meas. Sci. Technol.

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The reliability of microvibration measurements is important in some applications, such as infrastructure health monitoring. Thus, it is necessary to develop a vibration standard based on ISO16063-11 for microvibrations. In this study, the low-frequency standard vibration calibration system in the National Metrology Institute of Japan was upgraded to be compatible with small input vibrations down to an amplitude of 10−3 m s−2. A low-noise reference vibration measurement system and a precise signal processing method were integrated to reduce the background noise contribution, which is a dominant uncertainty source in the field of microvibration calibration. The developed system could calibrate the sensitivity of a low-noise accelerometer down to 10−3 m s−2, between 0.1 Hz and 100 Hz. This paper reports the calibration demonstration using a servo accelerometer and the evaluated uncertainty budget. The estimated calibration uncertainty was 0.1% for a normal calibration process with an excitation of 10 m s−2, and it was 2.1% for a microvibration calibration process with an excitation of 10−3 m s−2.

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Section: Introductionmentioning

confidence: 99%

Primary microvibration standards down to 10⁻³ m s⁻² at low frequency

Shimoda¹,

Kokuyama²,

Nozato³

2023

Meas. Sci. Technol.

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Linking Seismic Measurements to the International System of Units

Klaus,

Schwardt,

Pilger

et al. 2024

Pure Appl. Geophys.

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The current state of the art in the calibration of seismometers is given by internal calibration procedures which give only incomplete information about a seismometer’s response and are based on transfer functions supplied by manufacturers. Calibrations traceable to the International System of Units (SI) provide an independent and comprehensible characterization of seismometers. These calibrations take part in a laboratory using an electrodynamic shaker or shake table. To overcome the issue that seismometers placed in seismic stations are not supposed to be moved to a calibration laboratory, novel on-site calibration methods incorporating a reference seismometer were developed. Such a reference is placed near the sensor to be calibrated, and the transfer function of the seismometer under test can be derived based on the output of both sensors.

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