Advanced Development of the Digital Feedback Seismometer
{'Code': '06030202', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'Daniel F. Weill', 'PO_EMAI': None, 'PO_PHON': None}
Seismology depends on the measurement of ground motion by                  sensors involving an inertial mass to produce an accelerogram.                  This proposal requests support for the development of a seis-                   mometer that will incorporate a digital controller in the                       feedback loop mechanism of a force balance accelerometer. The                   system is constructed so that position of the inertial mass (the                error signal) is digitized at a high rate and then sent to a                    microprocessor which modifies the signal in the desired manner to               perform, for example, digital integration or compensation. The                  microprocessor input is then passed to a digital-to-analog                      converter or other output device to produce the controlling                     forces on the inertial mass of the sensor. The seismic signal                   consequently comes from the controller at a rate and precision                  (number of bits) tailored to the output desired for any given                   application. A prototype seismometer of the proposed design will                yield the following improvements over current analog systems:                   overall system simplification, stable linear response and                       accurate calibration, increased dynamic range and adaptability to               a variety of transducer systems.
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{'Name': 'University of California-San Diego Scripps Inst of Oceanography', 'CityName': 'LA JOLLA', 'ZipCode': '920931500', 'PhoneNumber': '8585341293', 'StreetAddress': '8622 DISCOVERY WAY # 116', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'California', 'StateCode': 'CA', 'CONGRESSDISTRICT': '50', 'CONGRESS_DISTRICT_ORG': 'CA50', 'ORG_UEI_NUM': 'QJ8HMDK7MRM3', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF CALIFORNIA SAN DIEGO', 'ORG_PRNT_UEI_NUM': 'QJ8HMDK7MRM3'}
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[{'Code': '1580', 'Text': 'Instrumentation & Facilities'}, {'Code': '1581', 'Text': 'CONTINENTAL DYNAMICS PROGRAM'}]
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