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 Laboratory (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 G01H - MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
G - PHYSICS G01 - MEASURING G01V - GEOPHYSICS
- 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
- Bosso, Sergio; Casaccia, Emilio; Frassati, Davide
- US Patent Document 6,763,151