An optofluidic dye concentration detector based on the pulsed photoacoustic effect

Kaustav Roy; Anjali Thomas; Souradip Paul; Anuj Ashok; Vijayendra Shastri; Kritank Kalyan; M. Suheshkumar Singh; Rudra Pratap

doi:10.1117/12.2582656

5 March 2021 An optofluidic dye concentration detector based on the pulsed photoacoustic effect

Kaustav Roy, Anjali Thomas, Souradip Paul, Anuj Ashok, Vijayendra Shastri, Kritank Kalyan, M. Suheshkumar Singh, Rudra Pratap

Author Affiliations +

Proceedings Volume 11637, Microfluidics, BioMEMS, and Medical Microsystems XIX; 116370M (2021) https://doi.org/10.1117/12.2582656
Event: SPIE BiOS, 2021, Online Only

Abstract

We report the development of an opto-acousto-fluidic platform by combining an illumination source in the form of a pulsed laser, a microfluidic channel, and an ultrasound transducer to detect photoacoustic signals generated from the fluid sample inside the channel. We study the effect of the channel dimensions on the emitted acoustic signals using methylene blue solution, a dye of immense interest in processing industry, as a target fluid and select an appropriate channel for further studies. We vary the concentration of the methylene blue dye and collect the corresponding photoacoustic signals. We find that the measured acoustic signal strength varies linearly with the increasing dye concentration, thus making this measurement scheme a potential dye concentration detector. This is a significant finding as it paves the way for developing a miniaturized photoacoustic detector for onsite sensing of dye concentration and perhaps even an online monitoring system which will be radical departure for current analysis methods using bench top bulky and expensive analytical tools.

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Kaustav Roy, Anjali Thomas, Souradip Paul, Anuj Ashok, Vijayendra Shastri, Kritank Kalyan, M. Suheshkumar Singh, and Rudra Pratap "An optofluidic dye concentration detector based on the pulsed photoacoustic effect", Proc. SPIE 11637, Microfluidics, BioMEMS, and Medical Microsystems XIX, 116370M (5 March 2021); https://doi.org/10.1117/12.2582656

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