Method for calibration-free scanned-wavelength modulation spectroscopy for gas sensing
Abstract
A method of calibration-free scanned-wavelength modulation spectroscopy (WMS) absorption sensing is provided by obtaining absorption lineshape measurements of a gas sample on a sensor using 1f-normalized WMS-2f where an injection current to an injection current-tunable diode laser (TDL) is modulated at a frequency f, where a wavelength modulation and an intensity modulation of the TDL are simultaneously generated, extracting using a numerical lock-in program and a low-pass filter appropriate band-width WMS-nf (n=1, 2, . . . ) signals, where the WMS-nf signals are harmonics of the f, determining a physical property of the gas sample according to ratios of the WMS-nf signals, determining the zero-absorption background using scanned-wavelength WMS, and determining non-absorption losses using at least two of the harmonics, where a need for a non-absorption baseline measurement is removed from measurements in environments where collision broadening has blended transition linewidths, where calibration free WMS measurements without knowledge of the transition linewidth is enabled.
- Inventors:
- Issue Date:
- Research Org.:
- Stanford Univ., CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1434512
- Patent Number(s):
- 9939376
- Application Number:
- 14/367,420
- Assignee:
- The Board of Trustees of the Leland Stanford Junior University (Palo Alto, CA)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01J - MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- FE0001180
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2012 Dec 19
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION
Citation Formats
Hanson, Ronald K., Jeffries, Jay B., Sun, Kai, Sur, Ritobrata, and Chao, Xing. Method for calibration-free scanned-wavelength modulation spectroscopy for gas sensing. United States: N. p., 2018.
Web.
Hanson, Ronald K., Jeffries, Jay B., Sun, Kai, Sur, Ritobrata, & Chao, Xing. Method for calibration-free scanned-wavelength modulation spectroscopy for gas sensing. United States.
Hanson, Ronald K., Jeffries, Jay B., Sun, Kai, Sur, Ritobrata, and Chao, Xing. Tue .
"Method for calibration-free scanned-wavelength modulation spectroscopy for gas sensing". United States. https://www.osti.gov/servlets/purl/1434512.
@article{osti_1434512,
title = {Method for calibration-free scanned-wavelength modulation spectroscopy for gas sensing},
author = {Hanson, Ronald K. and Jeffries, Jay B. and Sun, Kai and Sur, Ritobrata and Chao, Xing},
abstractNote = {A method of calibration-free scanned-wavelength modulation spectroscopy (WMS) absorption sensing is provided by obtaining absorption lineshape measurements of a gas sample on a sensor using 1f-normalized WMS-2f where an injection current to an injection current-tunable diode laser (TDL) is modulated at a frequency f, where a wavelength modulation and an intensity modulation of the TDL are simultaneously generated, extracting using a numerical lock-in program and a low-pass filter appropriate band-width WMS-nf (n=1, 2, . . . ) signals, where the WMS-nf signals are harmonics of the f, determining a physical property of the gas sample according to ratios of the WMS-nf signals, determining the zero-absorption background using scanned-wavelength WMS, and determining non-absorption losses using at least two of the harmonics, where a need for a non-absorption baseline measurement is removed from measurements in environments where collision broadening has blended transition linewidths, where calibration free WMS measurements without knowledge of the transition linewidth is enabled.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 10 00:00:00 EDT 2018},
month = {Tue Apr 10 00:00:00 EDT 2018}
}
Works referenced in this record:
Wavelength modulation spectroscopy with multiple harmonic detection
patent, March 2002
- Silver, Joel A.; Bomse, David S.
- US Patent Document 6,356,350
Calibration-free wavelength-modulation spectroscopy for measurements of gas temperature and concentration in harsh environments
journal, January 2009
- Rieker, Gregory B.; Jeffries, Jay B.; Hanson, Ronald K.
- Applied Optics, Vol. 48, Issue 29, p. 5546-5560
Dependence of harmonic signals on sample-gas parameters in wavelength-modulation spectroscopy for precise absorption measurements
journal, October 1998
- Uehara, K.
- Applied Physics B: Lasers and Optics, Vol. 67, Issue 4, p. 517-523