Point capteur de rotation R1

2 DUT 2X EENTEC R1 derived from automotive industrie Specifications Our goal : add new studies to our mid-band sensor i.e. 30s-1s Operating principle:Electrochemical motion transducer 1 Hz 1.2xE-7 rad/sec Dynamic Range 110 dB Self Noise Level < 1 microradian/sec RMS Sensitivity 50V/rad/sec Frequency 0.05 to 20 Hz ±3 dB Output Signal Swing ±5V Clip 1 Hz 01.0 rad/sec Translational SensitivityNone Parasitic ResonancesNone

3 Preliminary studies Rotational Data From the Taiwan Earthquake (ppt) This presentation prepared by Prof Liu, Academia Sinica and others detail the analysis of rotational seismic data obtained from the R-1 rotational seismometer and broadband seismometers from the September 26th, 2005 Taiwan Earthquake. Tilts in Strong Ground Motion This is paper published by Vladimer Graizer discusses how tilting of the strong motion Accelographs base can severely impact its response to ground motion. Effects of Tilt on Strong Motion Data Processing This paper published by Vladimer Grazer discusses ignoring tilt sesnitvity may produce unreliable results, especially in calculations of permanent displacement and long- period calculations. Only strong motion studies / High Freq i.e. > 1Hz

4 Largentiere earthquake M=4.5 EENTEC R1 + CMG3-90s

5 Largentiere earthquake M=4.5 Timing result

6 Largentiere earthquake M=4.5 Timing result filter 6 th order High pass 1Hz Small signal !!!

7 Largentiere earthquake M=4.5 Spectro + psd poor dynamic

8 Vanuatu 09/03/2011 M=7

9 Timing result filter 6 th order High pass 0.01Hz Low pass 0.1Hz

10 Need amplification ! To reach Low frequency ? Non inverting gain x 1000 AD8671 Bandwidth = 9.34 kHz Low input bias 12 nA Noise figure 3.6 nV/sqrt(Hz) including resistors Non inverting gain x 1000 AD8671 Bandwidth = 9.34 kHz Low input bias 12 nA Noise figure 3.6 nV/sqrt(Hz) including 1Hz noise level = 500nV => Rsb = 0.1Hz noise level = 10uV => Rsb = 10 Pour le CMG3 = L22 = 1Hz noise level = 500nV => Rsb = 0.1Hz noise level = 10uV => Rsb = 10 Pour le CMG3 = L22 = 40000

11 Guerrero M=6 Nothing happened…

12 Conclusion Useful for building structure, tremor studies (GGAP ?) or strong motion in addition to an adequate amplification FOG aircraft system MEMS ? Or equivalent for low frequency…