Standoff Passive Optical Leak Detection of （对峙被动光学检漏）.pdfVIP

Standoff Passive Optical Leak Detection of Volatile Organic Compounds using a Cooled InSb Based Infrared Imager Extended Abstract#06-A-131-AWMA Authors: Robert Benson, Robert Madding, Ron Lucier, James Lyons, Paul Czerepuszko, FLIR Systems, 25 Esquire Rd., North Billerica, MA. 01862., USA. ABSTRACT FLIR Systems has developed and fielded a passive IR imager capable of standoff leak detection of Volatile Organic Compounds (VOCs) in quantities beneficial to both industry and regulatory agencies. The imager, GasFindIR™, has undergone extensive laboratory testing and results are reported. Tests include: minimum resolvable volumetric leak flow rates of multiple VOCs, optical field of view impacts on detection, and imaging methodologies to enhance probability of leak detection. General and specific direct applications of the imager are discussed and guidance is given for its effective use in industrial settings. Potential future paths are discussed. INTRODUCTION Infrared spectral imaging of gases and vapors has been widely used in astronomical and geophysical applications for many years. The Infrared Space Observatory, The Atmospheric Infrared Sounder, and The Spitzer Space Telescope are the most notable platforms using IR spectral imaging systems. FLIR Systems has now adapted this space based technology for use in ground based commercial infrared hand held cameras. The GasFindIR™, see figure 1 and table 1, is an infrared spectral imager designed to visualize the absorptive and emissive properties of gases/vapors allowing the user the ability to discern the gas/vapor from its host environment. To wit, the imager “sees” the gas. The camera employs a spectral filter designed to transmit in a region of the IR spectrum that is coincident in wavelength with vibrational/rotational energy transitions of VOC molecular bonds1,2. These transitions are typically strongly coupled to the field via dipole moment changes in the m