| 摘要 |
<p>A Standoff quantum cascade Laser Photoacoustic Spectroscopy system with greater sensitivity, selectivity, improved Signal to Noise Ratio (SNR) and greater detection range. The system capable to detect traces in solid, Liquid and Vapor/ Gaseous phase of explosive, hazardous chemicals/chemical warfare agents, biological warfare agents, green houses gases and pollutant gases, the precise monitoring of trace gases including the detection of environmental pollutants, tracking of contaminants in closed environmental systems, medical diagnostics, defense, and homeland security. The system comprising: a quantum cascade tunable laser source to emit modulated pulse towards the target; a detector (120) coated with a layer of carbon black or TiO2 and comprises of a resonant cavity for detecting the pulses back scattered/reflected by the target; and a means for analyzing signals obtained from detector and display device for displaying information about target (110).</p> |
