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The development of a pulsed photoacoustic instrument for the detection of crude oil concentrations in produced water is reported. The instrument utilizes fiber-optic delivery of pulsed diode laser sources to an in-line sensor head, incorporating a gradient-index lens for optical delivery into the flow line and a piezoelectric transducer for acoustic detection. A crude oil concentration detection range of 5-8000 parts per million in water is demonstrated. The sensitivity of response wasdoi:10.1063/1.1149204 fatcat:f45g3xhqrzbxhitprkog6iztj4