Kristoffersen S K, Le Pichon A, Schwardt M, Vincent P, Doury B, Larsonnier F, Pilger C
CEA, DAM, DIF, F-91297 Arpajon, France.
Bundesanstalt für Geowissenschaften und Rohstoffe, B4.3, Hanover, Germany.
J Acoust Soc Am. 2024 Mar 1;155(3):1780-1798. doi: 10.1121/10.0025131.
The International Monitoring System (IMS) has been established as part of the Comprehensive Nuclear-Test-Ban Treaty to monitor nuclear testing and is comprised of infrasound, hydroacoustic, seismic, and radionuclide stations; it is also used more widely by the scientific community for scientific and civilian applications. For the infrasound stations, on-site calibration provides an accurate measure of the sensor (microbarometer + wind-noise reduction system) frequency response, used to monitor that the sensor response remains within tolerance of the baseline established when the station is certified. However, this on-site calibration can also be used when there are issues/defects with the sensors. As a result, the on-site calibration can be used to correct wave parameter estimations and increase the detection capability of the station. Examples using an experimental sensor at the IMS station IS26 (Germany) and IS47 (South Africa) demonstrate that errors of several degrees and tens of m/s can be introduced, under certain conditions, for the back azimuth and trace velocity, respectively. By using the on-site calibration, these errors are removed, and the correct back azimuth, trace velocity and amplitude are retrieved. This can be especially useful for the identification of infrasound signals, and the localization of their sources.
国际监测系统（IMS）作为《全面禁止核试验条约》的一部分已建立，用于监测核试验，它由次声、水声、地震和放射性核素监测站组成；科学界也更广泛地将其用于科学和民用领域。对于次声监测站，现场校准可精确测量传感器（微气压计+风噪声降低系统）的频率响应，用于监测传感器响应是否保持在监测站认证时所建立基线的公差范围内。然而，当传感器出现问题/缺陷时，也可使用这种现场校准。因此，现场校准可用于校正波参数估计并提高监测站的探测能力。在国际监测系统的IS26（德国）和IS47（南非）监测站使用实验性传感器的例子表明，在某些条件下，反方位角和轨迹速度可能分别引入几度和几十米/秒的误差。通过使用现场校准，这些误差得以消除，并能获取正确的反方位角、轨迹速度和振幅。这对于次声信号的识别及其源定位可能特别有用。
