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Point capteur de rotation R1

Point capteur de rotation R1. DUT. 2X EENTEC R1 derived from automotive industrie. Specifications. Operating principle: Electrochemical motion transducer Resolution @ 1 Hz 1.2xE-7 rad/sec Dynamic Range 110 dB Self Noise Level < 1 microradian/sec RMS

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Point capteur de rotation R1

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  1. Point capteurde rotation R1

  2. DUT 2X EENTEC R1 derived from automotive industrie Specifications Operating principle: Electrochemical motion transducer Resolution @ 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 Level @ 1 Hz 01.0 rad/sec Translational Sensitivity None Parasitic Resonances None Our goal : add new studies to our mid-band sensor i.e. 30s-1s

  3. 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. Laboratory and Field Testing of Two Rotational Seismometers (UCLA and USGS)
 Preliminary studies 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 6th order High pass 1Hz Small signal !!!

  7. Largentiere earthquake M=4.5 Spectro + psd poor dynamic

  8. Vanuatu 09/03/2011 M=7

  9. Vanuatu 09/03/2011 M=7 Timing result filter 6th order High pass 0.01Hz Low pass 0.1Hz

  10. Need amplification ! To reach Low frequency ? • @ 1Hz noise level = 500nV => Rsb = 200 • @ 0.1Hz noise level = 10uV => Rsb = 10 • Pour le CMG3 Rsb@1Hz = 400000 • L22 Rsb@1Hz = 40000 • Non inverting gain x 1000 AD8671 • Bandwidth = 9.34 kHz • Low input bias 12 nA • Noise figure 3.6 nV/sqrt(Hz) including resistors

  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…

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