An optical fiber sensor was developed to control the cleaning efficiency of surfactants. Prior to the measurements, the
sensing part of the probe is covered with a uniform standardized soil layer (lipid multilayer), and a gold mirror is
deposited at the end of the optical fiber. For the lipid multilayer deposition on the fiber, Langmuir-Blodgett technique
was used and the progress of deposition was followed online by ultraviolet spectroscopy. The invention provides a
miniaturized Surface Plasmon Resonance dip-sensor for automated on-line testing that can replace the cost and time
consuming existing methods and develop a breakthrough in detergent testing in combining optical sensing, surface
chemistry and automated data acquisition. The sensor is to be used to evaluate detergency of different cleaning products
and also indicate how formulation, concentration, lipid nature and temperature affect the cleaning behavior of a
surfactant.
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