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Title: 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:
; ; ; ;
Publication Date:
Research Org.:
The Board of Trustees of the Leland Stanford Junior University, Palo Alto, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1434512
Patent Number(s):
9,939,376
Application Number:
14/367,420
Assignee:
The Board of Trustees of the Leland Stanford Junior University (Palo Alto, CA) NETL
DOE Contract Number:
FE0001180
Resource Type:
Patent
Resource Relation:
Patent File Date: 2012 Dec 19
Country of Publication:
United States
Language:
English

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. doi:. 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}
}

Patent:

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