Ultrasonic temperature control and measurement in microfluidic channels

Hemanth Jagannathan; Goeksenin G. Yaralioglu; A. Sanli Ergun; Butrus T. Khuri-Yakub

doi:10.1117/12.478162

17 January 2003 Ultrasonic temperature control and measurement in microfluidic channels

Hemanth Jagannathan, Goeksenin G. Yaralioglu, A. Sanli Ergun, Butrus T. Khuri-Yakub

Proceedings Volume 4982, Microfluidics, BioMEMS, and Medical Microsystems; (2003) https://doi.org/10.1117/12.478162
Event: Micromachining and Microfabrication, 2003, San Jose, CA, United States

Abstract

This paper describes the design and operation of a system used for the accurate control and measurement of temperature in micro-fluidic channels. Ultrasonic transducers are used for both heating and measuring the temperature of fluids inside the channel. Heating is performed by exciting the transducer with a tone burst at a single frequency. The temperature measurement is done through non-invasive means by monitoring the velocity of a sound propagating through the channel. The whole system is automated for data collection using Labview. The system developed has the advantages of easy integration, simple operation and design along with a wide application domain. The same ultrasonic transducer can be used for both heating and temperature measurement leading to possibilities of closed loop temperature control in micro-channels. The system requires milli-watts of power for heating and has a nano-second response time for temperature measurement with an accuracy of 0.1 degrees.

Citation Download Citation

Hemanth Jagannathan, Goeksenin G. Yaralioglu, A. Sanli Ergun, and Butrus T. Khuri-Yakub "Ultrasonic temperature control and measurement in microfluidic channels", Proc. SPIE 4982, Microfluidics, BioMEMS, and Medical Microsystems, (17 January 2003); https://doi.org/10.1117/12.478162

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KEYWORDS

Transducers

Temperature metrology

Ultrasonics

Microfluidics

Ultrasonography

Electronics

Switching

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