Effect of temperature on passive remote sensing of chemicals by differential absorption radiometry

A spectral synthesis strategy is introduced to help obtain estimates of path-integrated concentrations in passive Fourier transform infrared (FT-IR) remote sensing measurements conducted during field-monitoring experiments. Obtaining quantitative information from passive infrared data is challenging because of the joint effects of temperature and concentration on spectral intensities. The collection of calibration data for use in modeling spectral intensities for a given set of experimental conditions is also costly and labor intensive. In the work presented here, a radiance model is defined for use in synthesizing calibration spectra that serve as inputs to partial least-squares (PLS) models that relate spectral intensities to path-integrated concentrations. The field data for which quantitative estimates are desired are used to estimate the background temperature associated with a given time and set of experimental conditions. Sample temperatures can be obtained through either experimental measurement or by estimating one calibration release. Given these temperatures, calibration data can be synthesized and the PLS model developed. This methodology is tested with stack monitoring data obtained from controlled releases of pure and mixture samples of heated ethanol and methanol. Experiments were conducted across 6 days with stack temperatures of 150 to 200 °C and with path-integrated concentrations in the range of 10 to 300 parts per million meters. Median relative errors in the estimates of path-integrated concentration were typically in the range of 20% or less, with the best results observed at the higher stack temperatures.

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“…The approach has been applied in stack emission analysis, detection of toxic gases in the workplace, and leak detection. 2–5…”

Section: Introductionmentioning

confidence: 99%

Quantitative Determination of Methanol and Ethanol with Synthetic Calibration Spectra in Passive Fourier Transform Infrared Remote Sensing Measurements

Guo

Small

2013

Appl Spectrosc

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“…Methanol is the second most abundant organic trace gas in the Earth's atmosphere after methane. Measurements of methanol are performed on the base of ground, airborne, and satellite instruments [5,6].…”

Section: Introductionmentioning

confidence: 99%

Observation of HD¹⁸O, CH₃OH and vibrationally-excited N₂O from Odin/SMR measurements

et al. 2006

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The sub-millimetre radiometer (SMR) instrument aboard the Odin satellite launched in February 2001 is dedicated to the observation of trace gas profiles in the stratosphere and in the mesosphere, in particular water vapour and its isotopic species HDO, H 2 17 O and H 2 18 O. By averaging more than 400 000 Odin/SMR spectra over the period from November 2002 to March 2003, weak lines have been detected in the atmosphere. These weak lines have been attributed to water isotopic species HD 18 O, to a vibrationally-excited N 2 O, and to CH 3 OH.

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“…Depending on whether an artificial light source is used, OP-FTIR measurement techniques can be divided into two categories: (1) the active measurement technique, where a manmade IR light source is used in conjunction with the spectrometer, 89,91,93 and the passive measurement approach, where naturally occurring ambient IR radiance is used as the light source. 35,84,94 Active OP-FTIR, quite similar to the classical setup of a laboratory FT-IR spectrometer except with a much longer optical path length, is able to provide data with quality close to laboratory data. Among OP-FT-IR measurements, this technique is most commonly applied, especially when low limits of detection (LOD) or high sensitivity are desired.…”

Section: Introductionmentioning

confidence: 99%

Pattern recognition methods for automated detection and quantification

Yu¹

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For the invaluable discussion and suggestion they offered to shape this dissertation. Many thanks go to current group member, Dr. Sanjeewa Rasika K Ranasinghe Pathirajage, Brian Dess, and Ziqi Fan as well as former group members. Dr. Qiaohan Guo, Dr. Chamathca Priyanwada Kuda-Malwathumullage and Wei Wang. I would like to thank the Environmental Protection Agency for funding the research in this dissertation. Special acknowledgement goes to Dr. Robert Kroutil and Dr. Mark Thomas from EPA, who were in charge of data collection of remote sensing FTIR and gamma-ray spectra used in this research and offered offer their expertise in the field of remote sensing. Last but not the least, my deepest and utmost appreciation goes to my parents, Xueying Chen and Rongfang Yu, who always encourage me to better myself and meet challenges. Without their unconditional love, inspiration and sacrifice, I won't be able to complete the course of my graduate study, and become who I am today.

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Effect of temperature on passive remote sensing of chemicals by differential absorption radiometry

Cited by 4 publications

References 10 publications

Quantitative Determination of Methanol and Ethanol with Synthetic Calibration Spectra in Passive Fourier Transform Infrared Remote Sensing Measurements

Quantitative Determination of Methanol and Ethanol with Synthetic Calibration Spectra in Passive Fourier Transform Infrared Remote Sensing Measurements

Observation of HD¹⁸O, CH₃OH and vibrationally-excited N₂O from Odin/SMR measurements

Pattern recognition methods for automated detection and quantification

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Effect of temperature on passive remote sensing of chemicals by differential absorption radiometry

Cited by 4 publications

References 10 publications

Quantitative Determination of Methanol and Ethanol with Synthetic Calibration Spectra in Passive Fourier Transform Infrared Remote Sensing Measurements

Quantitative Determination of Methanol and Ethanol with Synthetic Calibration Spectra in Passive Fourier Transform Infrared Remote Sensing Measurements

Observation of HD18O, CH3OH and vibrationally-excited N2O from Odin/SMR measurements

Pattern recognition methods for automated detection and quantification

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Observation of HD¹⁸O, CH₃OH and vibrationally-excited N₂O from Odin/SMR measurements