Validation des sismomètres par étalonnage primaire dans la gamme de fréquences de 8 mHz à 100 Hz / Validation of seismometers by primary calibration in the extended frequency range from 8 mHz to 100 Hz
Résumé
Seismic sensors are a quite special class of transducer regarding size, weight and frequency range. All three parameters can be challenging regarding a primary calibration according to ISO 16063-11. With diameters up to 50 cm, a weight of some 10 kg and a frequency range that can be as low as 0.008 Hz or as high as 100 Hz, the requirements for a calibration shaker are very high.
Problems such as the alignment of the calibration shaker, the magnetic stray field and the very low forces required for the calibration down to the millihertz frequency range and their effects on the measurements uncertainties have been investigated with simulations and corresponding measurements on existing calibration shakers. This poster presents those simulation and measurement results and tries to give some hints how to improve the performance of a calibration shaker for the horizontal and vertical excitation of seismic sensors in order to decrease the measurement uncertainty during a primary calibration of such kind of DUT.
Validation des sismomètres par étalonnage primaire dans la gamme de fréquences de 8 mHz à 100 Hz 1. SPEKTRA CS18P / CS Q-LEAP™ Système d'étalonnage pour capteurs sismiques Méthode: Étalonnage primaire selon la norme ISO 16063-11, utilisant un vibromètre laser comme référence.