Seismic switch for strong motion measurement

Title: Seismic switch for strong motion measurement

Full Record
Other Related Research

Abstract

A seismic switching device that has an input signal from an existing microseismic station seismometer and a signal from a strong motion measuring instrument. The seismic switch monitors the signal level of the strong motion instrument and passes the seismometer signal to the station data telemetry and recording systems. When the strong motion instrument signal level exceeds a user set threshold level, the seismometer signal is switched out and the strong motion signal is passed to the telemetry system. The amount of time the strong motion signal is passed before switching back to the seismometer signal is user controlled between 1 and 15 seconds. If the threshold level is exceeded during a switch time period, the length of time is extended from that instant by one user set time period.

Inventors:

Harben, Philip E ^[1]; Rodgers, Peter W ^[2]; Ewert, Daniel W ^[3]

Oakley, CA
Santa Barbara, CA
Patterson, CA

Issue Date:: 1995-01-01

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

OSTI Identifier:: 869911

Patent Number(s):: 5420380

Assignee:: United States of America as represented by United States (Washington, DC)

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: seismic; switch; strong; motion; measurement; switching; device; input; signal; existing; microseismic; station; seismometer; measuring; instrument; monitors; level; passes; data; telemetry; recording; systems; exceeds; user; set; threshold; switched; passed; amount; time; controlled; 15; exceeded; period; length; extended; instant; signal level; strong motion; threshold level; measuring instrument; time period; input signal; switching device; seismic switch; data telemetry; set threshold; /181/340/367/

Citation Formats


                    Harben, Philip E, Rodgers, Peter W, and Ewert, Daniel W. Seismic switch for strong motion measurement.  United States: N. p., 1995. 
        Web.

Copy to clipboard


                    Harben, Philip E, Rodgers, Peter W, & Ewert, Daniel W. Seismic switch for strong motion measurement.  United States.

Copy to clipboard


                    Harben, Philip E, Rodgers, Peter W, and Ewert, Daniel W. Sun .  
        "Seismic switch for strong motion measurement".  United States.  https://www.osti.gov/servlets/purl/869911.

Copy to clipboard


                    
@article{osti_869911,

  title        = {Seismic switch for strong motion measurement},

  author       = {Harben, Philip E and Rodgers, Peter W and Ewert, Daniel W},

  abstractNote = {A seismic switching device that has an input signal from an existing microseismic station seismometer and a signal from a strong motion measuring instrument. The seismic switch monitors the signal level of the strong motion instrument and passes the seismometer signal to the station data telemetry and recording systems. When the strong motion instrument signal level exceeds a user set threshold level, the seismometer signal is switched out and the strong motion signal is passed to the telemetry system. The amount of time the strong motion signal is passed before switching back to the seismometer signal is user controlled between 1 and 15 seconds. If the threshold level is exceeded during a switch time period, the length of time is extended from that instant by one user set time period.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1995},

  month        = {1}

}

Copy to clipboard

Patent:

View Patent

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE Patents and OSTI.GOV collections:

Seismic switch for strong motion measurement

Patent Harben, P E; Rodgers, P W; Ewert, D W

A seismic switching device is described that has an input signal from an existing microseismic station seismometer and a signal from a strong motion measuring instrument. The seismic switch monitors the signal level of the strong motion instrument and passes the seismometer signal to the station data telemetry and recording systems. When the strong motion instrument signal level exceeds a user set threshold level, the seismometer signal is switched out and the strong motion signal is passed to the telemetry system. The amount of time the strong motion signal is passed before switching back to the seismometer signal is usermore »« less
Oscillatory motion based measurement method and sensor for measuring wall shear stress due to fluid flow

Patent Armstrong, William D [Laramie, WY]; Naughton, Jonathan [Laramie, WY]; Lindberg, William R [Laramie, WY]

A shear stress sensor for measuring fluid wall shear stress on a test surface is provided. The wall shear stress sensor is comprised of an active sensing surface and a sensor body. An elastic mechanism mounted between the active sensing surface and the sensor body allows movement between the active sensing surface and the sensor body. A driving mechanism forces the shear stress sensor to oscillate. A measuring mechanism measures displacement of the active sensing surface relative to the sensor body. The sensor may be operated under periodic excitation where changes in the nature of the fluid properties or themore »« less
Full Text Available
Decreasing range resolution of a SAR image to permit correction of motion measurement errors beyond the SAR range resolution

Patent Doerry, Armin W [Albuquerque, NM]; Heard, Freddie E [Albuquerque, NM]; Cordaro, J Thomas [Albuquerque, NM]

Motion measurement errors that extend beyond the range resolution of a synthetic aperture radar (SAR) can be corrected by effectively decreasing the range resolution of the SAR in order to permit measurement of the error. Range profiles can be compared across the slow-time dimension of the input data in order to estimate the error. Once the error has been determined, appropriate frequency and phase correction can be applied to the uncompressed input data, after which range and azimuth compression can be performed to produce a desired SAR image.
Full Text Available
Comparing range data across the slow-time dimension to correct motion measurement errors beyond the range resolution of a synthetic aperture radar

Patent Doerry, Armin W [Albuquerque, NM]; Heard, Freddie E [Albuquerque, NM]; Cordaro, J Thomas [Albuquerque, NM]

Motion measurement errors that extend beyond the range resolution of a synthetic aperture radar (SAR) can be corrected by effectively decreasing the range resolution of the SAR in order to permit measurement of the error. Range profiles can be compared across the slow-time dimension of the input data in order to estimate the error. Once the error has been determined, appropriate frequency and phase correction can be applied to the uncompressed input data, after which range and azimuth compression can be performed to produce a desired SAR image.
Full Text Available
Intrinsic feature-based pose measurement for imaging motion compensation

Patent Baba, Justin S.; Goddard, Jr., James Samuel

Systems and methods for generating motion corrected tomographic images are provided. A method includes obtaining first images of a region of interest (ROI) to be imaged and associated with a first time, where the first images are associated with different positions and orientations with respect to the ROI. The method also includes defining an active region in the each of the first images and selecting intrinsic features in each of the first images based on the active region. Second, identifying a portion of the intrinsic features temporally and spatially matching intrinsic features in corresponding ones of second images of themore »« less
Full Text Available

Similar Records