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Photoacoustic Technique Can Detect Gases in Minute Amounts

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PROVIDENCE, R.I., Aug. 4, 2017 — Using a novel variation on the photoacoustic effect, scientists have demonstrated a way to detect trace gases down to concentrations at the parts-per-quadrillion level. Photoacoustic detectors work by zapping a material with a laser tuned to a wavelength that is absorbed by the molecule of interest. For example, to look for ammonia in air, the laser would be tuned to the specific absorption frequency of ammonia molecules. But the smaller the concentration of the target substance, the quieter the signal. Researchers at Brown University have developed a technique to boost the signal...Read full article

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    Published: August 2017
    Research & TechnologyeducationAmericasSensors & Detectorsphotoacousticstrace detectionenvironmentindustrial

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