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Updated: Aug 10, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
A waveguide pulse-echo system for ultrasonic absorption measurements in biological media
Abstract:
The system described has been designed for measurements of ultrasonic absorption in suspensions of biological cells. A novel feature of the design is the provision of a wave-guide sample tube which prevents beam diffraction. This ensures that the ultrasonic energy is wholly constrained between a single transducer and a moveable air-backed reflector, and is lost only by absorption in the sample. The associated electronics comprises a simple ultrasonic generator with variable power output, carrier frequency and mark-space ratio, and a digital thermometer with a thermistor probe for measuring the sample temperature.
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