Photothermal detection of trace compounds in water, using the deflection of a water meniscus
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Hodgkinson, Jane
Johnson, Mark
Dakin, John P.
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0957-0233
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Jane Hodgkinson, Mark Johnson and John P. Dakin. Photothermal detection of trace compounds in water, using the deflection of a water meniscus. Measurement Science and Technology, 1998, Vol. 9 (8), pp 1316-1323
Abstract
Anovelphotothermaldetectorisdescribed,basedonaclosedcellsuitableforusewithlow-frequencymodulatedcontinuous-wavelightsources.Photothermalexpansioninaqueoussamplescausedthedeflectionofawatermeniscusheldacrossa200m-radiuspinhole.Displacementofthewatermeniscuswasmeasuredusingfibreopticinterferometry.Amercurydischargelamp(254nm)andalaserdiode(678nm)wereusedtodetecttoabsorptionby2ppbanthraceneand0.5ppmpotassiumpermanganateinaqueoussolution,respectively.Thetechniquewasusedtodetectdifferencesbetweenabsorptioncoefficientsinaqueoussolutionsdowntoapproximately20%ofthebackgroundabsorptionofthewateritself.