Equipment testing for IMS waveform technologies...Yuri Starovoit, Patrick Grenard, Georgios...
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Equipment testing for IMS waveform technologies Yuri Starovoit, Patrick Grenard, Georgios Haralabus (all CTBTO IMS Division), Darren Hart (Sandia National Labs. USA) Peter Melichar (ZAMG, Austria) S&T Conference Vienna June 2011. Digitizer Testing atSandia National Laboratories Darren Hart SNL The purpose of the seismic subsystem noise test was to determine ability of the DM24 to resolve the expected seismic background using a specific seismometer. The DM24 S3AM self-noise should be below the expected seismic background and the self-noise of the seismometer. For a specific sensor application, the input terminated noise of the DM24 was converted to ground motion using the application seismometer response mathematical model. The result of this computation was overlaid with the USGS Low Earth Noise Model to demonstrate the ability of the DM24 to resolve the local seismic background. The DM24 Gain was changed to match the seismic subsystem noise to the local background. DM24 Gain X8 with STS-2 1500 V/M/S DM24 Gain X1 with CMG3-T 6000 V/M/S CMG3T Frequency response 2*10.000 V/M/S Test: TTA (Time-Tag Accuracy) ITN (Input Terminated Noise) Test: SSN (Seismic Subsystem Noise) ITN DM24 Gain X1 Time series New digitizer Test Results Guralp Systems New IMS CMG-DM24S3AM Digitizer 1. New IMS digitizer testing at SNL The digitizer is aimed to be used for the International Monitoring System (IMS) waveform technologies stations for CTBT verification purposes. Optional set up of sampling rates and output data formats (including cd1.1) as well as compliance with IMS minimum technical specifications expands the range of potential applications of the new digitizer to be used for single 3C seismic, T-phase hydroacoustic stations as well as for existing and new IMS seismic and infrasound arrays in combinations with other high resolution digitizers previously installed there. Flexible set up of the front end gaining allows matching system calibration factors without significant impact on the digitizer noise floor. The unit was tested under extreme temperature conditions potentially relevant for field applications over the entire IMS Network. In addition to compliant performance within IMS specifications for generic tests like DC accuracy, input terminated noise, harmonic distortion, timing accuracy and channels cross- talk the new digitizer has about 3.5W power consumption measured with embedded authentication card. The digitizer has a 2Gb CD1.1 data buffer and has the casing shape pertaining installation inside the borehole, if necessary. Abstract Since the establishment of CTBTO, the Provisional Technical Secretariat (PTS) has implemented a program of equipment testing to assure compliance of International Monitoring System (IMS) station equipment with the minimum technical requirements defined in the IMS Operational Manuals. The Sandia National laboratory (SNL) in NM, USA has been playing a key role in this effort as PTS’ technical counterpart, assisting with time-proven concepts of equipment testing procedures for waveform sensors and digitizers. Almost all digitizers currently in use in the IMS underwent testing at SNL. The development of a new generation of equipment to satisfy the needs for improvement and sustainment of the IMS requires even more the utilization of state-of-the-art testing methodologies. As part of this renewed effort, two new digitizers were recently evaluated at SNL for basic performance characteristics of bit-weight accuracy, self-noise, clip point, dynamic range, cross-talk, harmonic distortion, timing accuracy, timing drift with GPS loss and system noise analysis for common sensor types used at IMS seismic and infrasound stations. The units showed satisfactory behavior compliant with key minimum requirements for IMS waveform stations. During the testing process certain issues were addressed with the manufacturer to enhance product quality. These equipment testing procedures will be extended to the test facility at the Conrad Observatory (CO) of ZAMG, Austria, where the installation of test Infrasound and Seismic equipment allows the comparison of different geometries of infrasound wind noise reducing systems and the assessment of the added value derived by the synergy of co-located infrasound and broadband sensors. Test: DCA (DC Accuracy) 2. Testing of hybrid frequency response for IMS applications (PS27, PS44, AS104, AS58) DM24S3AM Gain X1 with CMG3T 2*10.000 V/M/S Broad-band (BB) velocity response Hz 1.e-4 1.e-3 1.e-2 1.e-1 1.e+0 1.e+1 1.e+2 H(s) normilized 1.e-4 1.e-4 1.e-3 1.e-2 1.e-1 1.e+0 1.e+1 flat in velocity flat in velocity flat in acceleration 3. Standard Station Interface (SSI) Testing and Development • Designed to meet unique IMS requirements • 7+ days buffer • Data authentication/PKI • Tamper switches (ADI) • Command and Control • Designed to use IDC formats and protocols • CD 1.0, CD 1.1 • SoH monitoring • AutoDRM • CSF subformat (signed) • Multiple Input Modules • Quanterra/Comserv, Guralp GCF, IDA NRTS, Nanometrics, DASE, SHI, Geotech, • CDrecv more • Runs under Linux (Fedora Core , Centos ) f Hz 0.001 0.010 0.100 1.000 10.000 H(p) normalized velocity 0.001 0.010 0.100 1.000 10.000 PS44 Turkmenistan, 9 elements regional IMS array. Ms=6.4 event 19.12.2009 in Taiwan Test case: noise study for hybrid response elements of PS44, GEYT . (courtesy of Nanometrics Inc. Canada) New hardware solution Test case: noise study for single component Z elements of AS104 EKA UK (courtesy of Guralp Ltd. UK) Equipment testing for recapitalization of IMS array PS27 NOA, Norway Maximum Potential Dynamic Range (MPDR) Waveform 20 mHz - 8 Hz 20 mHz - 16 Hz 0.5 Hz - 2 Hz IMS:2182E4 142.04 dB 139.24 dB 149.06 dB IMS:2182N4 141.79 dB 139.07 dB 148.71 dB IMS:2182Z4 141.81 dB 139.10 dB 148.84 dB Input Terminated Noise (ITN) Waveform 20 mHz - 8 Hz 20 mHz - 16 Hz 0.5 Hz - 2 Hz IMS:2182E4 1.34 rms_uV 1.85 rms_uV 0.597 rms_uV IMS:2182N4 1.38 rms_uV 1.89 rms_uV 0.622 rms_uV IMS:2182Z4 1.38 rms_uV 1.88 rms_uV 0.613 rms_uV Seismic System Noise (SSN) Test Waveform 20 mHz - 16 Hz 0.5 Hz - 2 Hz ITN-gain 1 40 sps IMS:2182N4 5.33 rms_nm/s² 0.252 rms_nm/s² ITN-gain 1 40 sps IMS:2182E4 5.28 rms_nm/s² 0.242 rms_nm/s² ITN-gain 1 40 sps IMS:2182Z4 5.30 rms_nm/s² 0.249 rms_nm/s² Bandwidth Limited Dynamic Range (BLDR) Test Waveform 20 mHz - 16 Hz 0.5 Hz - 2 Hz ITN-gain 1 40 sps IMS:2182N4 102.4 dB 128.9 dB ITN-gain 1 40 sps IMS:2182E4 102.5 dB 129.3 dB ITN-gain 1 40 sps IMS:2182Z4 102.5 dB 129.1 dB Waveform Mean Min Max Stddev N IMS:2182Z6 -0.156 ms -0.158 ms -0.153 ms 0.885 us 390 Time-Tag Statistics Waveform Antenna Covered Antenna Uncovered Signal Reacquired Drift Rate Recovery Rate IMS:2182Z 6 2010/10/06 16:00:39.167 2010/10/06 16:59:06.649 2010/10/06 17:16:18.609 -5.82 us/h -30.5 us/h Time Tag Drift Bandwidth Limited Dynamic range statistics Seismic System Noise statistics Maximum potential dynamic range statistics Input Terminated Noise statistics The Conrad Observatory is equipped with infrasound and broadband sensors at external vaults built by ZAMG Institute of the Austrian National Seismic Network. Results from the infrasound and seismic sensors suggest a strong correlation of long period horizontal seismic signals with infrasonic traces associated to the 36-m diameter pipe arrays. We investigate the possibility of coupling between the seismic and infrasound sensors (separated by less than 1 meter) and exclude the presence of mechanical or electronic coupling of the two sensors. We further investigate possible mechanisms that might cause the correlation, including influence of topology since the array is located at less than 300 meters from the topographic edge of Trafelberg Mountain. 4. IMS test site at Conrad Observatory Frequency response of the BB Hybrid sensor General view of the Conrad observatory Infrasound test site at Conrad observatory Similarity of infrasound and seismic background spectrograms at Conrad observatory Test case: noise study for BB elements of PS27 NOA. Frequency response (FR)of 1C (red ) at PS44 and conventional FR of 1C passive sensors (black) Time tag accuracy (TTA) test results Input terminated noise (ITN) test results Input terminated noise test series DC accuracy test series The views expressed here do not necessarily reflect the views of the United States Government, the United States Department of Energy, or Sandia National Laboratories.
Transcript of Equipment testing for IMS waveform technologies...Yuri Starovoit, Patrick Grenard, Georgios...
Equipment testing for IMS waveform technologiesYuri Starovoit, Patrick Grenard, Georgios Haralabus (all CTBTO IMS Division), Darren Hart (Sandia National Labs. USA) Peter Melichar (ZAMG, Austria)
S&T Conference Vienna June 2011.
Digitizer Testing atSandia National LaboratoriesDarren Hart SNL The purpose of the seismic subsystem noise test was to determine ability of the DM24 to resolve the expected
seismic background using a specific seismometer. The DM24 S3AM self-noise should be below the expected seismic background and the self-noise of the seismometer.For a specific sensor application, the input terminated noise of the DM24 was converted to ground motion using the application seismometer response mathematical model. The result of this computation was overlaid with the USGS Low Earth Noise Model to demonstrate the ability of the DM24 to resolve the local seismic background.The DM24 Gain was changed to match the seismic subsystem noise to the local background.
DM24 Gain X8 with STS-2 1500 V/M/SDM24 Gain X1 with CMG3-T 6000 V/M/S
CMG3T Frequency response 2*10.000 V/M/S
Test: TTA (Time-Tag Accuracy)
ITN (Input Terminated Noise)
Test: SSN (Seismic Subsystem Noise)
ITN DM24 Gain X1 Time series
New digitizer Test Results
Guralp Systems New IMS CMG-DM24S3AM Digitizer
1. New IMS digitizer testing at SNLThe digitizer is aimed to be used for the International Monitoring System (IMS) waveformtechnologies stations for CTBT verification purposes.Optional set up of sampling rates and output data formats (including cd1.1) as well as compliance with IMS minimum technical specifications expands the range of potential applications of the new digitizer to be used for single 3C seismic, T-phase hydroacoustic stations as well as for existing and new IMS seismic and infrasound arrays in combinations with other high resolution digitizers previously installed there. Flexible set up of the front end gaining allows matching system calibration factors without significant impact on the digitizer noise floor. The unit was tested under extreme temperature conditions potentially relevant for field applications over the entire IMS Network. In addition to compliant performance within IMS specifications for generic tests like DC accuracy, input terminated noise, harmonic distortion, timing accuracy and channels cross-talk the new digitizer has about 3.5W power consumption measured with embedded authentication card. The digitizer has a 2Gb CD1.1 data buffer and has the casing shape pertaining installation inside the borehole, if necessary.
AbstractSince the establishment of CTBTO, the Provisional Technical Secretariat (PTS) has implemented a program of equipment testing to assure compliance of International Monitoring System (IMS) station equipment with the minimum technical requirements defined in the IMS Operational Manuals.The Sandia National laboratory (SNL) in NM, USA has been playing a key role in this effort as PTS’ technical counterpart, assisting with time-proven concepts of equipment testing procedures for waveform sensors and digitizers. Almost all digitizers currently in use in the IMS underwent testing at SNL. The development of a new generation of equipment to satisfy the needs for improvement and sustainment of the IMS requires even more the utilization of state-of-the-art testing methodologies.As part of this renewed effort, two new digitizers were recently evaluated at SNL for basic performance characteristics of bit-weight accuracy, self-noise, clip point, dynamic range, cross-talk, harmonic distortion, timing accuracy, timing drift with GPS loss and system noise analysis for common sensor types used at IMS seismic and infrasound stations.The units showed satisfactory behavior compliant with key minimum requirements for IMS waveform stations. During the testing process certain issues were addressed with the manufacturer to enhance product quality.These equipment testing procedures will be extended to the test facility at the Conrad Observatory (CO) of ZAMG, Austria, where the installation of test Infrasound and Seismic equipment allows the comparison of different geometries of infrasound wind noise reducing systems and the assessment of the added value derived by the synergy of co-located infrasound and broadband sensors.
Test: DCA (DC Accuracy)
2. Testing of hybrid frequency response for IMS applications (PS27, PS44, AS104, AS58)
DM24S3AM Gain X1 with CMG3T 2*10.000 V/M/S
Broad-band (BB) velocity response
Hz1.e-4 1.e-3 1.e-2 1.e-1 1.e+0 1.e+1 1.e+2
H(s
) nor
mili
zed
1.e-4
1.e-4
1.e-3
1.e-2
1.e-1
1.e+0
1.e+1
flat in velocity
flat in velocity
flat in acceleration
3. Standard Station Interface (SSI) Testing and Development
• Designed to meet unique IMS requirements• 7+ days buffer• Data authentication/PKI• Tamper switches (ADI)• Command and Control
• Designed to use IDC formats and protocols• CD 1.0, CD 1.1• SoH monitoring• AutoDRM• CSF subformat (signed)
• Multiple Input Modules• Quanterra/Comserv, Guralp GCF, IDA NRTS, Nanometrics, DASE, SHI, Geotech, • CDrecv more
• Runs under Linux (Fedora Core , Centos )
f Hz0.001 0.010 0.100 1.000 10.000
H(p
) nor
mal
ized
vel
ocity
0.001
0.010
0.100
1.000
10.000
PS44 Turkmenistan, 9 elements regional IMS array.
Ms=6.4 event 19.12.2009 in Taiwan
Test case: noise study for hybrid response elements of PS44, GEYT .(courtesy of Nanometrics Inc. Canada)
New hardware solution
Test case: noise study for single component Z elements of AS104 EKA UK (courtesy of Guralp Ltd. UK)
Equipment testing for recapitalization of IMS array PS27 NOA, Norway
Maximum Potential Dynamic Range (MPDR)Waveform 20 mHz - 8 Hz 20 mHz - 16 Hz 0.5 Hz - 2 HzIMS:2182E4 142.04 dB 139.24 dB 149.06 dBIMS:2182N4 141.79 dB 139.07 dB 148.71 dB
IMS:2182Z4 141.81 dB 139.10 dB 148.84 dB
Input Terminated Noise (ITN)
Waveform 20 mHz - 8 Hz 20 mHz - 16 Hz 0.5 Hz - 2 Hz
IMS:2182E4 1.34 rms_uV 1.85 rms_uV 0.597 rms_uV
IMS:2182N4 1.38 rms_uV 1.89 rms_uV 0.622 rms_uV
IMS:2182Z4 1.38 rms_uV 1.88 rms_uV 0.613 rms_uV
Seismic System Noise (SSN)Test Waveform 20 mHz - 16 Hz 0.5 Hz - 2 Hz
ITN-gain 1 40 sps IMS:2182N4 5.33 rms_nm/s² 0.252 rms_nm/s²
ITN-gain 1 40 sps IMS:2182E4 5.28 rms_nm/s² 0.242 rms_nm/s²
ITN-gain 1 40 sps IMS:2182Z4 5.30 rms_nm/s² 0.249 rms_nm/s²
Bandwidth Limited Dynamic Range (BLDR)Test Waveform 20 mHz - 16 Hz 0.5 Hz - 2 Hz
ITN-gain 1 40 sps IMS:2182N4 102.4 dB 128.9 dB
ITN-gain 1 40 sps IMS:2182E4 102.5 dB 129.3 dB
ITN-gain 1 40 sps IMS:2182Z4 102.5 dB 129.1 dB
Waveform Mean Min Max Stddev N
IMS:2182Z6 -0.156 ms -0.158 ms -0.153 ms 0.885 us 390
Time-Tag Statistics
WaveformAntenna Covered
Antenna Uncovered
Signal Reacquired
Drift Rate
Recovery Rate
IMS:2182Z6
2010/10/06 16:00:39.167
2010/10/06 16:59:06.649
2010/10/06 17:16:18.609
-5.82 us/h -30.5 us/h
Time Tag Drift
Bandwidth Limited Dynamic range statistics
Seismic System Noise statistics
Maximum potential dynamic range statistics
Input Terminated Noise statistics
The Conrad Observatory is equipped with infrasound and broadband sensors at externalvaults built by ZAMG Institute of the Austrian National Seismic Network.Results from the infrasound and seismic sensors suggest a strong correlation of long periodhorizontal seismic signals with infrasonic traces associated to the 36-m diameter pipe arrays.We investigate the possibility of coupling between the seismic and infrasound sensors(separated by less than 1 meter) and exclude the presence of mechanical or electroniccoupling of the two sensors. We further investigate possible mechanisms that might cause thecorrelation, including influence of topology since the array is located at less than 300 metersfrom the topographic edge of Trafelberg Mountain.
4. IMS test site at Conrad Observatory
Frequency response of the BB Hybrid sensor
General view of the Conrad observatory Infrasound test site at Conrad observatory
Similarity of infrasound and seismic background spectrograms at Conrad observatory
Test case: noise study for BB elements of PS27 NOA.
Frequency response (FR)of 1C (red ) at PS44 and conventional FR of 1C passive sensors (black)
Time tag accuracy (TTA) test results
Input terminated noise (ITN) test results Input terminated noise test series
DC accuracy test series
The views expressed here do not necessarily reflect the views of the United States Government, the United States Department of Energy, or Sandia National Laboratories.
