Traceable calibration of a broadband seismometer down to 5 mHz
MEASUREMENT SCIENCE AND TECHNOLOGY(2022)
摘要
Broadband seismometers have been widely employed in geophysical observation and disaster prevention. To ensure the reliability of the measurement, traceable calibration of their sensitivities following ISO 16063-11 down to 8 mHz is required. However, the calibration accuracy generally degrades below 0.1 Hz due to tilt-coupling error. In this paper, two tilt-coupling correction methods are investigated: one is a dynamic tilt measurement method using an autocollimator, and the other is a comparison method using a reference accelerometer. These methods were introduced to the primary calibration system to calibrate a seismometer between 5 mHz and 200 Hz. As a result, the tilt-coupling error was corrected with an estimated uncertainty of less than 2% at 5 mHz, and the bandpass response of the seismometer sensitivity was confirmed with the traceable method.
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关键词
seismometer, calibration, traceability, low-frequency vibration, tilt coupling
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