Hui Li
Professor Supervisor of Doctorate Candidates Supervisor of Master's Candidates
Academic Titles:信息与通信工程学院副院长
Gender:Female
Alma Mater:Royal Institute of Technology
Degree:Doctoral Degree
School/Department:School of Information and Communication Engineering
Discipline:Communication and Information Systems. Electromagnetic Field and Microwave Technology
Business Address:No. 2, Linggong Road, Dalian University of Technology, Dalian, Liaoning Province; 116024
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Date:2020-03-02
Indexed by:Journal Papers
Date of Publication:2020-01-01
Journal:CHINESE PHYSICS B
Included Journals:SCIE、EI
Volume:29
Issue:1
ISSN:1674-1056
Key Words:microfluidics; sensors; permittivity; dielectric liquid
Abstract:We propose a low-cost compact microfluidic temperature sensor by virtue of the temperature-dependent permittivity of liquid. The sensor is composed of a coplanar waveguide (CPW) transmission line loaded with three resonators and a microfluidic plate with three channels. The resonant frequency of each resonator relies on the temperature-dependent dielectric property of liquid in corresponding channel, which therefore can be used to extract the temperature. The proposed sensor features a compact size and low cost since it requires only micro fluid volume instead of additional electronic components to produce significant frequency shift with changing temperature. Moreover, it exhibits decent accuracy and stability in a temperature sensing range from 30 degrees C to 95 degrees C. A theoretical analysis of the sensor is provided, followed by the detailed characterization method, and a prototype is designed, manufactured, and measured to verify the theoretical analysis.
