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Title: Low noise, high bandwidth, high sensitivity laser seismometer

Abstract

A laser seismometer may measure the change in a phase modulated optical signal. Unlike traditional interferometers, the laser phase is first modulated by a radio frequency (RF) source, which is then demodulated following detection to provide the signal of interest. The net result is a direct measurement of displacement with the effects of amplitude noise eliminated via limiting and the effects of 1/f phase noise (frequency drift, etc.) eliminated by self-interfering the signal. Because the signal-to-noise ratio (SNR) of the optical signal is strong, the technique provides a strong measure of the displacement and avoids the extremely low voltages and associated problems of traditional sensors.

Inventors:
; ; ;
Issue Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1568153
Patent Number(s):
10247850
Application Number:
15/709,763
Assignee:
Triad National Security, LLC (Los Alamos, NM)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01V - GEOPHYSICS
G - PHYSICS G01 - MEASURING G01H - MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Patent
Resource Relation:
Patent File Date: 09/20/2017
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Judd, Stephen, Seitz, Gerald, Shinas, Michael, and Briggs, Matthew. Low noise, high bandwidth, high sensitivity laser seismometer. United States: N. p., 2019. Web.
Judd, Stephen, Seitz, Gerald, Shinas, Michael, & Briggs, Matthew. Low noise, high bandwidth, high sensitivity laser seismometer. United States.
Judd, Stephen, Seitz, Gerald, Shinas, Michael, and Briggs, Matthew. Tue . "Low noise, high bandwidth, high sensitivity laser seismometer". United States. https://www.osti.gov/servlets/purl/1568153.
@article{osti_1568153,
title = {Low noise, high bandwidth, high sensitivity laser seismometer},
author = {Judd, Stephen and Seitz, Gerald and Shinas, Michael and Briggs, Matthew},
abstractNote = {A laser seismometer may measure the change in a phase modulated optical signal. Unlike traditional interferometers, the laser phase is first modulated by a radio frequency (RF) source, which is then demodulated following detection to provide the signal of interest. The net result is a direct measurement of displacement with the effects of amplitude noise eliminated via limiting and the effects of 1/f phase noise (frequency drift, etc.) eliminated by self-interfering the signal. Because the signal-to-noise ratio (SNR) of the optical signal is strong, the technique provides a strong measure of the displacement and avoids the extremely low voltages and associated problems of traditional sensors.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {4}
}

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Works referenced in this record:

Electro-optic modulators with internal impedance matching
patent, July 2004