Fiber-Optic Evaporation Sensing: Monitoring Environmental Conditions and Urinalysis

Preter, Eyal; Katzman, Moshe; Ziv, Oren; Ronen, Maria; Gerber, Doron; Zadok, Avi

doi:10.1109/jlt.2016.2535723

Cited by 7 publications

(3 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mechanism of the evaporation of a sessile droplet has been extensively studied [24][25][26]. The evaporation of a liquid is a thermodynamic process occurring below the ebullition temperature of this liquid when it is surrounded by non-saturated air.…”

Section: Physics Of Evaporationmentioning

confidence: 99%

Monitoring the evaporation of a sessile water droplet by means of integrated photonic resonator

Garnier¹,

Lhermite²,

Víe³

et al. 2020

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

We have investigated the behavior of the optical transduced signal of a photonic integrated polymer micro resonator as an evaporating water droplet is positioned upon it. The photonic chip is fabricated by means of deep-UV photolithography, and the circuits are made of polymer UV210. The device is then arranged in an optical bench so as to perform relevant measurements thanks to a broadband laser for the excitation of the resonators and an optical spectrum analyzer remotely controlled by a Matlab software for the acquisition and treatment of data. By dynamically tracking the free spectral range (FSR) of the optical mode, we come up with a signature of the thermodynamic evaporation process. In order to correlate this signature to the evaporation speed of the water droplet, a lateral camera is disposed to measure the evolution of the geometrical characteristics of the droplet, while weight measurements are performed thanks to a precision balance. These measurements provide a numerical link between the temporal variation of the FSR and the variation of the distance between the apex of the droplet and the substrate, correlating clearly the variation of the FSR with the mass change of the droplet. The measurements have been performed with 20 µl droplets for three different substrate temperatures: 21 °C, 24 °C and 27 °C. Then, theoretical investigations have been also performed in order to interpret the dynamics of the FSR in terms of guiding theory.

show abstract

Section: Physics Of Evaporationmentioning

confidence: 99%

Monitoring the evaporation of a sessile water droplet by means of integrated photonic resonator

Garnier¹,

Lhermite²,

Víe³

et al. 2020

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…FOSs have been used for measuring various parameters such as displacement, strain, temperature, and pressure. − Currently, FOSs are fabricated following different designs, such as the fiber-optic gyroscopes, the fiber grating sensors, the interferometer sensors, and so forth. Fiber-optic interferometers are widely utilized in the analysis of liquid droplets, − especially, the extrinsic Fabry–Perot interferometer (EFPI)-based sensor, which has demonstrated tremendous potential because it is simple and highly sensitive. , Using the EFPI approach to monitor liquid droplet evaporation events has been previously reported in the literature. − However, the previous studies focused on evaporation dynamics, but they did not use the experiment data to identify liquids. Moreover, the model employed in the present study provides a substantial improvement over the classification models used in the previous studies.…”

Section: Introductionmentioning

confidence: 99%

Identification of Volatile Organic Liquids by Combining an Array of Fiber-Optic Sensors and Machine Learning

et al. 2023

View full text Add to dashboard Cite

In this paper, we report an array of fiber-optic sensors based on the Fabry–Perot interference principle and machine learning-based analyses for identifying volatile organic liquids (VOLs). Three optical fiber tip sensors with different surfaces were included in the array of sensors to improve the accuracy for identifying liquids: an intrinsic (unmodified) flat cleaved endface, a hydrophobic-coated endface, and a hydrophilic-coated endface. The time-transient responses of evaporating droplets from the optical fiber tip sensors were monitored and collected following the controlled immersion tests of 11 different organic liquids. A continuous wavelet transform was used to convert the time-transient response signal into images. These images were then utilized to train convolution neural networks for classification (identification of VOLs). We show that diversity in the information collected using the array of three sensors helps machine learning-based methods perform significantly better. We explore different pipelines for combining the information from the array of sensors within a machine learning framework and their effect on the robustness of models. The results showed that the machine learning-based methods achieved high accuracy in their classification of different liquids based on their droplet evaporation time-transient events.

show abstract

“…Now, while the position of the first boundary is fixed, the second recedes as the droplet evaporates. The phase-scan of the field reflected by such displacing surface generates a clearly detectable interferogram in the back-propagating modal intensity that codifies the whole history of the droplet's evaporation dynamics, allowing to reconstruct position and recession velocity of the liquid surface at any given moment of the evaporation process 22 . On the other hand, the described system is analogous to the scanning interferometers used in FT spectrum analyzers, therefore information on the spectral distribution of the radiation delivered to the droplet is in principle also encoded in the backreflection signal.…”

mentioning

confidence: 99%

A self-operating broadband spectrometer on a droplet

et al. 2020

View full text Add to dashboard Cite

Small-scale Fourier transform spectrometers are rapidly revolutionizing infrared spectro-chemical analysis, enabling on-site and remote sensing applications that were hardly imaginable just few years ago. While most devices reported to date rely on advanced photonic integration technologies, here we demonstrate a miniaturization strategy which harnesses unforced mechanisms, such as the evaporation of a liquid droplet on a partially reflective substrate. Based on this principle, we describe a self-operating optofluidic spectrometer and the analysis method to retrieve consistent spectral information in spite of the intrinsically non-reproducible droplet formation and evaporation dynamics. We experimentally realize the device on the tip of an optical fiber and demonstrate quantitative measurements of gas absorption with a 2.6 nm resolution, in a 100 s acquisition time, over the 250 nm span allowed by our setup’s components. A direct comparison with a commercial optical analyzer clearly points out that a simple evaporating droplet can be an efficient small-scale, inexpensive spectrometer, competitive with the most advanced integrated photonic devices.

show abstract

Fiber-Optic Evaporation Sensing: Monitoring Environmental Conditions and Urinalysis

Cited by 7 publications

References 27 publications

Monitoring the evaporation of a sessile water droplet by means of integrated photonic resonator

Monitoring the evaporation of a sessile water droplet by means of integrated photonic resonator

Identification of Volatile Organic Liquids by Combining an Array of Fiber-Optic Sensors and Machine Learning

A self-operating broadband spectrometer on a droplet

Contact Info

Product

Resources

About