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Elastomeric microwire-based optical gas flowmeter with stretching-enabled tunability in measurement range.

Jiwon Lee¹, Jaeyoun Kim

¹Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011, USA.

|October 4, 2011

Summary

Transparent poly(dimethylsiloxane) (PDMS) microwires enable optical gas flowmetry. Mechanical stretching of these PDMS microwires tunes the measurement range and enhances flowmeter sensitivity and miniaturization.

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Area of Science:

Materials Science
Optical Engineering
Fluid Dynamics

Background:

Traditional gas flowmeters can be bulky and complex.
Optical methods offer non-invasive flow measurement possibilities.
Poly(dimethylsiloxane) (PDMS) is a versatile elastomer with tunable properties.

Purpose of the Study:

To develop a miniaturized and tunable optical gas flowmeter.
To utilize the unique properties of poly(dimethylsiloxane) (PDMS) microwires as a transducer.
To demonstrate the impact of mechanical stretching on flowmeter performance.

Main Methods:

Fabrication of transparent poly(dimethylsiloxane) (PDMS) microwires.
Integration of PDMS microwires into an optical gas flowmetry setup.
Application of controlled mechanical stretching to the PDMS microwires.
Measurement of gas flow rates and sensitivity analysis.

Main Results:

Achieved a sensitivity of 2.8 to 9.8 dB/SLM using a 9 mm PDMS microwire.
Demonstrated tuning of the measurement range from 1 to 4 SLM by stretching the microwire by 500 μm.
Experimental results showed good agreement with a fluid dynamic/optical model.

Conclusions:

PDMS microwires are effective transducers for optical gas flowmetry.
Mechanical stretching provides a method to miniaturize, simplify, and tune the measurement range of the flowmeter.
This approach offers a promising pathway for developing advanced gas sensing technologies.