Fiber-optic Sensors for the Monitoring of Liquid Mixtures Optical Engineering, Feb. 26, 2014 Eyal...
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Fiber-optic Sensors for the Monitoring of Liquid Mixtures Optical Engineering, Feb. 26, 2014 Eyal Preter, 1 Vlada Artal, 1,2 Chaim N. Sukenik, 2 and Avi Zadok 1,* 1 Faculty of Engineering, Bar-Ilan University, Israel 2 Departmaent of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Israel [email protected]
Fiber-optic Sensors for the Monitoring of Liquid Mixtures Optical Engineering, Feb. 26, 2014 Eyal Preter, 1 Vlada Artal, 1,2 Chaim N. Sukenik, 2 and Avi
Fiber-optic Sensors for the Monitoring of Liquid Mixtures
Optical Engineering, Feb. 26, 2014 Eyal Preter, 1 Vlada Artal, 1,2
Chaim N. Sukenik, 2 and Avi Zadok 1,* 1 Faculty of Engineering,
Bar-Ilan University, Israel 2 Departmaent of Chemistry, Faculty of
Exact Sciences, Bar-Ilan University, Israel
[email protected]
Slide 2
How to monitor Evaporation? Traditionally: Direct observation:
contact angle Goniometer AFM cantilevers Micro Gravimetry Accuracy
Complicated Setup Limited accessibility 2 Dr. Avi Zadok, Bar-Ilan
Univ. Feb. 2014
Slide 3
Objective Simple, low-cost fiber-optic sensor for monitoring
the evaporation of liquids Proof of concept Evaporation-related
data Comparing with traditional methods Applications 3 Dr. Avi
Zadok, Bar-Ilan Univ. Feb. 2014
Slide 4
The Setup Laser Fiber Tip Resonator Circulator Power Meter
Scope The Sensor: Cleaved Fiber The Input: Fixed Laser Source The
Readout: Low Bandwidth Detector & Scope. 4 Dr. Avi Zadok,
Bar-Ilan Univ. Feb. 2014
Slide 5
Principle of Operation Light is launched from the remote end of
the fiber, and the reflected power is monitored Light is reflected
at the fiber / liquid interface, and the liquid / air interface The
two reflections combined create interference, according to the
thickness of the liquid droplet As the liquid evaporates,
interference fringes are observed: 5 Dr. Avi Zadok, Bar-Ilan Univ.
Feb. 2014
Slide 6
Typical Results: Raw Data Water 6 Dr. Avi Zadok, Bar-Ilan Univ.
Feb. 2014
Slide 7
Typical Results: Instantaneous Droplet Length Water 7 Dr. Avi
Zadok, Bar-Ilan Univ. Feb. 2014
Slide 8
Control Experiment 8 Dr. Avi Zadok, Bar-Ilan Univ. Feb.
2014
Slide 9
Control Experiment 9 Dr. Avi Zadok, Bar-Ilan Univ. Feb.
2014
Slide 10
Apps (1): Mixtures Study Ethanol Concentration In Water 10 Dr.
Avi Zadok, Bar-Ilan Univ. Feb. 2014
Slide 11
Apps (1): Mixtures Study Ethanol Concentration In Water 11 Dr.
Avi Zadok, Bar-Ilan Univ. Feb. 2014
Slide 12
Apps (2): Recognition of solvents: bare fiber tip Difficult to
categorize 10 solvents based on evaporation time and droplet size
alone 12 Dr. Avi Zadok, Bar-Ilan Univ. Feb. 2014
Slide 13
Surface Modification Surface treatment Deposition of single
layer (monolayer) hydrophobic coating. The monolayer does not
interact with the light, but changes the surface behave. Normal
Fiber Coated Fiber 13 Dr. Avi Zadok, Bar-Ilan Univ. Feb. 2014
Slide 14
Surface Modification Dynamics Bare Fiber Coated Fiber 14 Dr.
Avi Zadok, Bar-Ilan Univ. Feb. 2014
Slide 15
Evaporation from modified surfaces Acetone 15 Dr. Avi Zadok,
Bar-Ilan Univ. Feb. 2014
Slide 16
Droplet length on coated fiber: relation with polarity index 16
Dr. Avi Zadok, Bar-Ilan Univ. Feb. 2014
Slide 17
Apps (2): Recognition of solvents: coated fiber tip Evaporation
from coated fibers can distinguish between all 10 solvents through
simple data analysis 17 Dr. Avi Zadok, Bar-Ilan Univ. Feb.
2014
Slide 18
Apps (2): Recognition of solvents: combined analysis Solvents
recognition based on the combined analysis of evaporation from both
bare and coated fibers 18 Dr. Avi Zadok, Bar-Ilan Univ. Feb.
2014
Slide 19
Apps (3): Recognition of flexible fuel blends 19 A Flex Fuel
Sensor is a device that measures the ethanol content in the cars
fuel system. The sensor is installed between the fuel pressure
regulator and the fuel tank, where it monitors the ethanol content
of the fuel returning to the tank. The information is then passed
onto the system which applies fuel, ignition and boost corrections.
The system allows the driver to add any mixture of ethanol/petrol
(from 0-100% ethanol content). Dr. Avi Zadok, Bar-Ilan Univ. Feb.
2014
Slide 20
Apps (3): Recognition of flexible fuel blends A large number of
flexible-fuel vehicles in the US are equipped with an in-line
sensor for reading the contents of alcohol in volume Sensors cost
above 100$. The proposed fiber sensor is capable of recognizing
different blends of ethanol-gasoline or methanol-gasoline 20 Dr.
Avi Zadok, Bar-Ilan Univ. Feb. 2014
Slide 21
Apps (3): Recognition of flexible fuel blends Methanol
concentration in gasoline: 21 The sensor readout for each blend is
different Dr. Avi Zadok, Bar-Ilan Univ. Feb. 2014
Slide 22
Potential Applications Identifying flexible fuel blends
Detection of fuel fraud and dilution, at the gas station and inside
the car Monitoring the production of bio-diesel (for example, using
methanol and micro-waves) Monitoring the efficiency of internal
combustion process, reduce pollution Quality control of water,
beverages and food Mobile point-of-care diagnostics (NUFAR program,
to begin March 2014). 22 Dr. Avi Zadok, Bar-Ilan Univ. Feb.
2014
Slide 23
Conclusion 23 Dr. Avi Zadok, Bar-Ilan Univ. Feb. 2014