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

Stephen Keith Holland; Roland H. Krauss; Gabriel Laufer

doi:10.1117/1.2080760

1 October 2005 Effect of temperature on passive remote sensing of chemicals by differential absorption radiometry

Stephen Keith Holland, Roland H. Krauss, Gabriel Laufer

Author Affiliations +

Optical Engineering, Vol. 44, Issue 10, 106201 (October 2005). https://doi.org/10.1117/1.2080760

Abstract

Differential absorption radiometry (DAR), using uncooled detectors, is a simple, low-cost method for passive remote sensing of hazardous chemicals for domestic security applications. However, radiometric temperature differences (ΔT_effective) between a target gas species and its background affect detection sensitivity. Two DARs with sensitivities to methanol, diisopropyl methylphosphonate (DIMP), and dimethyl methylphosphonate (DMMP), all spectral or physical simulants of hazardous chemicals, were developed and used to experimentally determine the effect of |ΔT_effective| on detection sensitivity. An analytical model was also developed and compared with the experimental results. With a signal-to-noise ratio (SNR)<5, a |ΔT_effective|≥2 K is sufficient for rapid (≤1 s) detection of methanol at <0.03 atm cm and DMMP and DIMP at <0.001 atm cm. These measured sensitivities suggest that rapid detection of hazardous chemical vapor clouds below lethal dose concentrations can be achieved using room-temperature pyroelectric detectors. Measurements were within 3% of the analytical predictions.

©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Stephen Keith Holland, Roland H. Krauss, and Gabriel Laufer "Effect of temperature on passive remote sensing of chemicals by differential absorption radiometry," Optical Engineering 44(10), 106201 (1 October 2005). https://doi.org/10.1117/1.2080760

Published: 1 October 2005

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available