Effect of mechanical stress on optical properties of polydimethylsiloxane

Turek, Ivan; Tarjányi, Norbert; Martinček, Ivan; Kacik, Daniel

doi:10.1016/j.optmat.2013.12.049

Cited by 34 publications

(13 citation statements)

References 16 publications

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“…The DCPAS measurement reveals prominent PDMS absorbance peaks at 171.6 THz, 176.0 THz, 177.4 THz. The location of these peaks are in good agreement with the spectrophotometer absorbance measurement and previously published results 49,50 . The normalized PA response of paraffin contains well-defined absorbance peaks at 169.8 THz and 173.1 THz.…”

Section: Dcpas Conceptsupporting

confidence: 91%

Dual-comb photoacoustic spectroscopy

et al. 2020

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Spectrally resolved photoacoustic imaging is promising for label-free imaging in optically scattering materials. However, this technique often requires acquisition of a separate image at each wavelength of interest. This reduces imaging speeds and causes errors if the sample changes in time between images acquired at different wavelengths. We demonstrate a solution to this problem by using dual-comb spectroscopy for photoacoustic measurements. This approach enables a photoacoustic measurement at thousands of wavelengths simultaneously. In this technique, two optical-frequency combs are interfered on a sample and the resulting pressure wave is measured with an ultrasound transducer. This acoustic signal is processed in the frequency-domain to obtain an optical absorption spectrum. For a proof-ofconcept demonstration, we measure photoacoustic signals from polymer films. The absorption spectra obtained from these measurements agree with those measured using a spectrophotometer. Improving the signal-to-noise ratio of the dual-comb photoacoustic spectrometer could enable high-speed spectrally resolved photoacoustic imaging.

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Section: Dcpas Conceptsupporting

confidence: 91%

Dual-comb photoacoustic spectroscopy

et al. 2020

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“…A small change in thickness of a PDMS substrate can imply a substantial change of the light intensity that passes through the layer. Turek et al [ 306 ] investigated the effect of deformation on the optical properties of the PDMS and showed that the effect of compression on the optical transparency and refractive index of PDMS is significant. They concluded that PDMS could be employed for constructing stress optical sensors of mechanical displacement or stress.…”

Section: Applications Of Micromodels and Imaging Techniquesmentioning

confidence: 99%

Review of Microfluidic Devices and Imaging Techniques for Fluid Flow Study in Porous Geomaterials

Jahanbakhsh

Wlodarczyk

Hand

et al. 2020

Sensors

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Understanding transport phenomena and governing mechanisms of different physical and chemical processes in porous media has been a critical research area for decades. Correlating fluid flow behaviour at the micro-scale with macro-scale parameters, such as relative permeability and capillary pressure, is key to understanding the processes governing subsurface systems, and this in turn allows us to improve the accuracy of modelling and simulations of transport phenomena at a large scale. Over the last two decades, there have been significant developments in our understanding of pore-scale processes and modelling of complex underground systems. Microfluidic devices (micromodels) and imaging techniques, as facilitators to link experimental observations to simulation, have greatly contributed to these achievements. Although several reviews exist covering separately advances in one of these two areas, we present here a detailed review integrating recent advances and applications in both micromodels and imaging techniques. This includes a comprehensive analysis of critical aspects of fabrication techniques of micromodels, and the most recent advances such as embedding fibre optic sensors in micromodels for research applications. To complete the analysis of visualization techniques, we have thoroughly reviewed the most applicable imaging techniques in the area of geoscience and geo-energy. Moreover, the integration of microfluidic devices and imaging techniques was highlighted as appropriate. In this review, we focus particularly on four prominent yet very wide application areas, namely “fluid flow in porous media”, “flow in heterogeneous rocks and fractures”, “reactive transport, solute and colloid transport”, and finally “porous media characterization”. In summary, this review provides an in-depth analysis of micromodels and imaging techniques that can help to guide future research in the in-situ visualization of fluid flow in porous media.

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“…Later, the utilization of polymer with high thermal expansion and thermo optic coefficient has been researched to enhance the sensitivity. Various works on different polymers such as polydimethylsiloxane, polyvinyl alcohol, polycarbonate, polymethylmethacrylate and polystyrene have been reported [30][31][32][33][34][35][36][37][38][39][40][41][42][43]. The variant of grating, known as Bragg Fibers, is implemented to enhance sensing applications [44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Novel Apodized Fiber Bragg Grating Applied for Medical Sensors: Performance Investigation

Arumugam¹,

Kumar²,

Dhanalakshmi³

et al. 2023

Computer Modeling in Engineering &Amp; Sciences

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Sensors play an important role in shaping and monitoring human health. Exploration of methods to use Fiber Bragg Grating (FBG) with enhanced sensitivity has attracted great interest in the field of medical research. In this paper, a novel apodization function is proposed and performance evaluation and optimization of the same have been made. A comparison was conducted between various existing apodization functions and the proposed one based on optical characteristics and sensor parameters. The results evince the implementation of the proposed apodization function for vital sign measurement. The optical characteristics considered for evaluation are Peak Resonance Reflectivity level, Side Lobes Reflectivity level and Full Width Half Maximum (FWHM). The proposed novel apodization novel function has better FWHM, which is narrower than the FWHM of uniform FBG. Sensor characteristics like a quality parameter, detection accuracy and sensitivity also show improvement. The proposed novel apodization function is demonstrated to have a better shift in wavelength in terms of temperature and pulse measurement than the existing functions. The sensitivity of the proposed apodized function is enhanced with a Poly-dimethylsiloxane coating of varying thickness, which is 6 times and 5.14 times greater than uniform Fiber Bragg grating and FBG with the proposed novel apodization function, respectively, enhancing its utilization in the field of medicine.

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Effect of mechanical stress on optical properties of polydimethylsiloxane

Cited by 34 publications

References 16 publications

Dual-comb photoacoustic spectroscopy

Dual-comb photoacoustic spectroscopy

Review of Microfluidic Devices and Imaging Techniques for Fluid Flow Study in Porous Geomaterials

Novel Apodized Fiber Bragg Grating Applied for Medical Sensors: Performance Investigation

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