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Title: Frequency-feedback cavity enhanced spectrometer

Patent ·
OSTI ID:1210874
;

A spectrometer comprising an optical cavity, a light source capable of producing light at one or more wavelengths transmitted by the cavity and with the light directed at the cavity, a detector and optics positioned to collect light transmitted by the cavity, feedback electronics causing oscillation of amplitude of the optical signal on the detector at a frequency that depends on cavity losses, and a sensor measuring the oscillation frequency to determine the cavity losses.

Research Organization:
Southwest Sciences Incorporated, Santa Fe, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
SC0007534
Assignee:
Southwest Sciences Incorporated (Santa Fe, NM)
Patent Number(s):
9,110,006
Application Number:
14/309,495
OSTI ID:
1210874
Resource Relation:
Patent File Date: 2014 Jun 19
Country of Publication:
United States
Language:
English

References (20)

Spectroscopy using active diode laser stabilization by optical feedback patent May 1999
Frequency transform phase shifting interferometry patent April 2005
Phase-shifting interferometry method and system patent August 2005
System and method for trace species detection using cavity attenuated phase shift spectroscopy with an incoherent light source patent November 2007
Selectivity enhancement in photoacoustic gas analysis via phase-sensitive detection at high modulation frequency patent October 2010
Method and apparatus for the photo-acoustic identification and quantification of analyte species in a gaseous or liquid medium patent December 2012
Method and apparatus for locking a laser with a resonant cavity patent September 2013
Method and apparatus for the photo-acoustic identification and quantification of analyte species in a gaseous or liquid medium patent-application September 2011
Cavity-Ringdown Spectroscopy, Copyright, Advisory Board, Foreword book April 1999
Phase shift cavity ring down absorption spectroscopy journal November 1996
CO 2 monitoring and detection using an integrating sphere as a multipass absorption cell journal September 2007
Sensitive measurement of photon lifetime and true reflectances in an optical cavity by a phase-shift method journal January 1980
Detection of Nitrogen Dioxide by Cavity Attenuated Phase Shift Spectroscopy journal January 2005
Gas cells for tunable diode laser absorption spectroscopy employing optical diffusers. Part 2: Integrating spheres journal April 2010
An historical overview of cavity-enhanced methods journal October 2005
Cavity-locked ring-down spectroscopy journal April 1998
Evanescent wave cavity ring-down spectroscopy with a total-internal-reflection minicavity journal August 1997
Optical–feedback cavity–enhanced absorption: a compact spectrometer for real–time measurement of atmospheric methane journal April 2006
Single-cell detection by cavity ring-down spectroscopy journal January 2004
Cavity-enhanced frequency modulation spectroscopy: advancing optical detection sensitivity and laser frequency stabilization conference May 1998

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