Non-Intrusive Fruit and Plant Analysis by Laser Photothermal Measurements of Ethylene Emission

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Abstract

Photothermal trace gas detection reaches extremely high sensitivity combined with good time resolution for a select group of molecules that are of great importance in a biological context. For ethylene, a sensitivity of 6 pl/l has been achieved; for ammonia, 0.5 nl/l has been detected; methane produced by anaerobic bacteria has been measured down to 1 nl/l. The field of application and of investigated gas species is growing rapidly. In this contribution, we focus on ethylene because, for this molecule, this novel technique has been extensively applied.