point capteur de rotation r1
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Point capteur de rotation R1
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DUT
2X EENTEC R1 derived from automotive industrie
2X EENTEC R1 derived from automotive industrie
SpecificationsSpecifications
Our goal : add new studies to our mid-band sensor i.e. 30s-1sOur goal : add new studies to our mid-band sensor i.e. 30s-1s
Operating principle: Electrochemical motion transducerResolution @ 1 Hz 1.2xE-7 rad/secDynamic Range 110 dBSelf Noise Level < 1 microradian/sec RMSSensitivity 50V/rad/secFrequency 0.05 to 20 Hz ±3 dBOutput Signal Swing ±5V Clip Level @ 1 Hz 01.0 rad/secTranslational Sensitivity NoneParasitic Resonances None
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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.
• Laboratory and Field Testing of Two Rotational Seismometers (UCLA and USGS)
Only strong motion studies / High Freq i.e. > 1Hz
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Largentiere earthquake M=4.5
EENTEC R1 + CMG3-90s EENTEC R1 + CMG3-90s
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Largentiere earthquake M=4.5
Timing resultTiming result
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Largentiere earthquake M=4.5
Timing result filter 6th order High pass 1HzTiming result filter 6th order High pass 1Hz
Small signal !!!
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Largentiere earthquake M=4.5
Spectro + psdSpectro + psd
poor dynamic
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Vanuatu 09/03/2011 M=7
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Vanuatu 09/03/2011 M=7
Timing result filter 6th order High pass 0.01Hz Low pass 0.1HzTiming result filter 6th order High pass 0.01Hz Low pass 0.1Hz
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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 resistors
• @ 1Hz noise level = 500nV => Rsb = 200
• @ 0.1Hz noise level = 10uV => Rsb = 10
• Pour le CMG3 Rsb@1Hz = 400000
• L22 Rsb@1Hz = 40000
• @ 1Hz noise level = 500nV => Rsb = 200
• @ 0.1Hz noise level = 10uV => Rsb = 10
• Pour le CMG3 Rsb@1Hz = 400000
• L22 Rsb@1Hz = 40000
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Guerrero M=6
• Nothing happened…• Nothing happened…
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Conclusion
• Useful for building structure, tremor studies (GGAP ?) or strong motion in addition to an adequate amplification
• 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…
• FOG aircraft system MEMS ? Or equivalent for low frequency…