Passive Remote Sensing by<scp>FT</scp>‐<scp>IR</scp>Spectroscopy

Combs, Roger J.; Kroutil, Robert T.; Small, Gary W.

doi:10.1002/0470027320.s6801

Cited by 3 publications

(2 citation statements)

References 111 publications

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“…The dotted line is the least squares fit to this data and the slope of this line is the responsivity (R). The R values for 9.68im, lO.34im and lO.75im are 8.00(1 Os), 10.0(1 O) and 1 1 .1 (1 respectively. The noise values for band locations of 9.68im, 1 O.34pin, and lO.75pni are 1 .2(l06), 1 .3(l06), and 1 .4(106), respectively.…”

Section: Calibrationmentioning

confidence: 97%

Encapsulation of the U.S. Environmental Protection Agency (EPA) standoff chemical detection requirements for commercial sensor system developers

et al. 2004

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This paper is a collaborative effort between the US EPA's Technology Applications and Research & Development groups to generate commercial interest in the development of cost effective sensors appropriate for the requirements of organizations in the CIVIL sector chartered with providing emergency first response support. The US EPA Region-7 Technology Applications Group maintains the Airborne Spectral Photometric Environmental Collection Technology (ASPECT) System. This system provides the US EPA with operational 24 hour I seven days a week emergency response remote chemical detection capability. Data collected by the ASPECT system along with first responder requirements will be encapsulated in a manner suitable for guiding the efforts of commercial sensor system manufactures (e.g. , effluents of interest, bounding concentrations/abundances, bounding environmental background parameters, sensor radiometric performance requirements for high-confidence response/action, operational readiness timelines, etc.). This paper is intended to provide the requirements, initiate and guide the synthesis process for sensor(s) and instrument packages providing sufficient area coverage, spectral resolution, and sensitivity to detect, selectivity to identify, image, and map hazardous chemical plumes. It is believed this effort will facilitate cost effective and timely state of the art sensor/system technology development suitable for CIVIL emergency response needs in compact automated packages.

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Section: Calibrationmentioning

confidence: 97%

Encapsulation of the U.S. Environmental Protection Agency (EPA) standoff chemical detection requirements for commercial sensor system developers

et al. 2004

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“…23 This computation is done with single-beam spectra from the three cell conditions: (1) methanol in Figure 11, (2) blank cell, and (3) the no cell in Figure 4. Calculation of the passive IR transmittance uses the ratio of differences.…”

Section: Passive Methanol Assessmentmentioning

confidence: 99%

A portable vapor cell for passive FT-IR spectrometer evaluation

et al. 2005

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Gravimetrically prepared aqueous binary solutions permit the generation of target vapors of methanol and ammonia in a portable vapor cell. A passive Fourier transform infrared (FT-IR) spectrometer monitors a short pathlength optical cell using a calibrated extended-blackbody background source. The temperature of the blackbody ranges from 5ºC to 50ºC in five degree increments. This temperature range simulates the radiance levels most often encountered for ambient temperature backgrounds in open-air field measurements. The solute liquid mole fractions determine the resultant vapor concentrations. The water component attenuates the target vapor concentration from that of the pure solute component depending on the solute liquid mole fraction. This study demonstrates the utility of a portable vapor cell using a series of binary aqueous solutions per target compound over the Beer's Law range of infrared absorbances. These Beer's Law infrared absorbances and blackbody radiance levels are within the linearity range of the passive FT-IR spectrometer and are representative of open-air field conditions.

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