[ABSTRAK
Seismometer mempunyai karakteristik seperti frekuensi natural, konstantadamping, bandwidth frekuensi dan sensitivitas. Nilai dari besaran-besaran tersebutberpengaruh dalam pengolahan data seismik, terutama parameter gempa bumiseperti magnitudo, olah karena itu diperlukan kalibrasi sehingga dihasilkanpengukuran yang valid. Kalibrasi seismometer adalah kalibrasi untukmendapatkan nilai sensitivitasnya. Penelitian ini bertujuan untuk mendapatkannilai paramater seismometer yaitu sensitivitas yang tertelusur ke satuaninternational, dengan merancang sistem kalibrasi seismometer secara relatifmaupun absolut. Perancangan sistem kalibrasi dilakukan baik secara hardwaremaupun software. Pada hardware dirancang sistem low noise digitizer denganADC beresolusi 16 bit, sedangkan untuk pengolahan dan analisa data kalibrasidigunakan software builder LabVIEW.Dari data hasil kalibrasi tiga lokasi yang berbeda, kalibrasi relatif menggunakansignal sinus 1 Hz di dapat bahwa sensitivitas seismometer TDV-23S mempunyainilai sebesar 1217,28 ± 3,42 V/m/s atau 0,25 % untuk nilai ketidakpastiannyapada setiap komponen dan nilai konstanta damping 0,49.
ABSTRACT
Seismometers have characteristics, such as natural frequencies, dampingconstants, frequencies bandwidth, and sensitivities. The values of thecharacteristics have very influential in determine of earthquake magnitude.Therefore, calibration of seismometers is needed to obtain validated measurement.This research is aimed to design calibration system either relative or absolute, inorder to obtain the sensitivity value that traceable to international units. Thecalibration system design is done in hardware and software. On the hardware, isdesigned low noise digitizer system with 16 bit resolution, for the processing andcalibration data analysis is used LabVIEW Software Builder.The calibration test data from this research are seismic signals which are recordedfrom three different locations. Results from testing on the entire seismic signalsshow that relative calibration which is used sine signal of 1 Hz, gives 1217,28±3,42 V/m/s sensitivity of TDV-23S seismometer is obtained, or uncertainty ofeach component of 0,25% and the damping constant of 0.49.;Seismometers have characteristics, such as natural frequencies, dampingconstants, frequencies bandwidth, and sensitivities. The values of thecharacteristics have very influential in determine of earthquake magnitude.Therefore, calibration of seismometers is needed to obtain validated measurement.This research is aimed to design calibration system either relative or absolute, inorder to obtain the sensitivity value that traceable to international units. Thecalibration system design is done in hardware and software. On the hardware, isdesigned low noise digitizer system with 16 bit resolution, for the processing andcalibration data analysis is used LabVIEW Software Builder.The calibration test data from this research are seismic signals which are recordedfrom three different locations. Results from testing on the entire seismic signalsshow that relative calibration which is used sine signal of 1 Hz, gives 1217,28±3,42 V/m/s sensitivity of TDV-23S seismometer is obtained, or uncertainty ofeach component of 0,25% and the damping constant of 0.49., Seismometers have characteristics, such as natural frequencies, dampingconstants, frequencies bandwidth, and sensitivities. The values of thecharacteristics have very influential in determine of earthquake magnitude.Therefore, calibration of seismometers is needed to obtain validated measurement.This research is aimed to design calibration system either relative or absolute, inorder to obtain the sensitivity value that traceable to international units. Thecalibration system design is done in hardware and software. On the hardware, isdesigned low noise digitizer system with 16 bit resolution, for the processing andcalibration data analysis is used LabVIEW Software Builder.The calibration test data from this research are seismic signals which are recordedfrom three different locations. Results from testing on the entire seismic signalsshow that relative calibration which is used sine signal of 1 Hz, gives 1217,28±3,42 V/m/s sensitivity of TDV-23S seismometer is obtained, or uncertainty ofeach component of 0,25% and the damping constant of 0.49.] |
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