OVMS Acceleerometer Testing the Level 1 Instrument Room; (PEPSI's room in the pier)

  • Summary: It was expected that the LBT pier would be a suitably quiet place to test the OVMS accelerometers. However, there was enough disturbance that the noise floor of the sensors/DAQ system was not achievable.

  • Note that the noise that "ruined" our noise floor characterization is on the order of 10s of nanometers. This was not measured directly at the floor, but on an aluminum block sitting on a soft, thin mat on the concrete floor. The accelerometers were oriented such that they measured motion orthogonal to the plane of the floor.

  • Some data is collected here for use by interested parties.

  • Fs = 2016-Hz; 24-bit A/D, max gain

Data Set 1

  • Acceleration PSD of night-time pier data (Instrument room):
    Paa_00_pm.jpg

  • Forward-sum of acceleration PSD of night-time pier data (Instrument room):
    Fwd_Paa_00_pm.jpg

  • Acceleration PSD of night-time pier data (Instrument room):
    Paa_01_pm.jpg

  • Forward-sum of acceleration PSD of night-time pier data (Instrument room):
    Fwd_Paa_01_pm.jpg

  • Displacement PSD of night-time pier data (Instrument room):
    Pxx_00_pm.jpg

  • Displacement PSD of night-time pier data, with accelerometer spec noise floor (Instrument room) (-- JorgeEsguerra - 14 Apr 2010):
    Pxx_01_pm_with_noise_floor.jpg

  • Acceleration PSD of night-time pier data (Instrument room):
    Pxx_01_pm.jpg

  • Forward-sum of displacement PSD of night-time pier data (Instrument room):
    Fwd_Pxx_01_pm.jpg

Data Set 2

  • quiet_data_am.txt: Pier data taken at 8:45-AM local, on 23 March, 2010. (Might see the fixed-elevator!)

  • Looks similar to data set 1, so I will not post plots

-- JorgeEsguerra - 31 Mar 2010

I Attachment Action Size Date Who Comment
Fwd_Paa_00_pm.jpgjpg Fwd_Paa_00_pm.jpg manage 221 K 31 Mar 2010 - 06:28 UnknownUser Forward-sum of acceleration PSD of night-time pier data (Instrument room)
Fwd_Paa_01_pm.jpgjpg Fwd_Paa_01_pm.jpg manage 223 K 31 Mar 2010 - 06:31 UnknownUser Forward-sum of acceleration PSD of night-time pier data (Instrument room)
Fwd_Pxx_00_pm.jpgjpg Fwd_Pxx_00_pm.jpg manage 114 K 31 Mar 2010 - 06:45 UnknownUser Forward-sum of displacement PSD of night-time pier data (Instrument room)
Fwd_Pxx_01_pm.jpgjpg Fwd_Pxx_01_pm.jpg manage 123 K 31 Mar 2010 - 06:47 UnknownUser Forward-sum of displacement PSD of night-time pier data (Instrument room)
Paa_00_pm.jpgjpg Paa_00_pm.jpg manage 460 K 31 Mar 2010 - 06:27 UnknownUser Acceleration PSD of night-time pier data (Instrument room)
Paa_01_pm.jpgjpg Paa_01_pm.jpg manage 436 K 31 Mar 2010 - 06:30 UnknownUser Acceleration PSD of night-time pier data (Instrument room)
Pxx_00_pm.jpgjpg Pxx_00_pm.jpg manage 121 K 31 Mar 2010 - 06:45 UnknownUser Displacement PSD of night-time pier data (Instrument room)
Pxx_01_pm.jpgjpg Pxx_01_pm.jpg manage 161 K 31 Mar 2010 - 06:47 UnknownUser Acceleration PSD of night-time pier data (Instrument room)
Pxx_01_pm_with_noise_floor.jpgjpg Pxx_01_pm_with_noise_floor.jpg manage 167 K 14 Apr 2010 - 06:55 UnknownUser Displacement PSD of night-time pier data, with accelerometer spec noise floor (Instrument room)
quiet_data_am.txttxt quiet_data_am.txt manage 26 MB 31 Mar 2010 - 06:51 UnknownUser Pier data taken at 8:45-AM local, on 23 March, 2010. (Might see the fixed-elevator!)
quiet_data_pm.txttxt quiet_data_pm.txt manage 13 MB 31 Mar 2010 - 06:12 UnknownUser Pier data taken at night.
Topic revision: r2 - 14 Apr 2010, JorgeEsguerra
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