Ms. Fathima Shirin Profile

Fathima Shirin

at Indian Institute of Science Education and Research Thiruvananthap

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Proceedings Article | 12 March 2024 Poster + Paper

Simulation of photoacoustic signal detection using fiber Bragg gratings

Arijit Paramanick, Fathima Shirin Chembala, Deepayan Samanta, M. Suheshkumar Singh

Proceedings Volume 12842, 128421G (2024) https://doi.org/10.1117/12.3003660

KEYWORDS: Fiber Bragg gratings, Signal detection, Photoacoustic spectroscopy, Bragg wavelengths, Refractive index, Sensors, Ultrasound transducers, Ultrasonography, Temperature metrology, Radio propagation

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Photoacoustic imaging (PAI) is now a very promising medical imaging technology that provides structural, functional, and molecular information based on the optical absorption of endogenous or exogenous contrast agents. A conventional PAI system using an array of ultrasonic transducers to detect photoacoustic (PA) signals. Each element of the transducer requires an amplifier to enhance the detected signal which makes it bulky. To overcome this problem, we introduced optical sensor alternative to piezoelectric ultrasound detector in PA signal detection. This study aims to illustrate the entire process of PA signal generation and its detection using an optical sensor using Finite Element software (COMSOL). Fiber Bragg grating (FBG) is one of the optical sensors that may be utilized in some applications in place of acoustic ones. FBG provides the change in acoustic pressure as a function of the shift of Bragg wavelength. Our study demonstrated that FBG achieves to detect photoacoustic (PA) signals as an alternative of US transducer, with superior performance in terms of sensitivity, and being more light-weight, flexible, and cost-effective. This implies that these technologically novel qualities hold promise for the use of FBG (either single or multiple units on a single fiber) as an acoustic sensor in PAI systems in place of the conventional piezoelectric-based bulk array transducer. An intensity-based demodulation was performed to extract the US signal. The preliminary study demonstrates that the integration of FBG in PA imaging modality offers potential as a future (imaging) technology both for biological studies and clinical applications.

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