Phase Detection of the Two-port FPW Sensor for Biosensing

Area of Science:

• Biosensor technology
• Miniaturized electronic systems
• Acoustic wave sensing

Background:

• Network analyzers are standard for acoustic wave sensor measurements but are not portable.
• Existing measurement techniques lack convenience for field applications.
• Miniaturization is crucial for developing portable biosensing devices.

Purpose of the Study:

• To design and integrate a miniature system for biosensor applications.
• To develop a portable readout concept for flexural plate wave (FPW) sensors.
• To overcome the inconvenience of traditional network analyzers for portable use.

Main Methods:

• Integrated a phase detection circuit with a FPW sensor.
• Developed a miniature system comprising a Wien-Bridge oscillator, voltage follower, FPW device, phase-locked loop, phase detector, MCU, and LCM display.
• Focused on the core phase detection technology for system integration.

Main Results:

• Successfully integrated all subsystems into a compact FPW sensor system.
• Demonstrated the core phase detection function within the miniaturized system.
• Achieved a phase shift resolution of 10 mV/1°.

Conclusions:

• The developed miniature FPW sensor system is suitable for portable biosensing.
• The integrated phase detection circuit provides a viable and convenient readout method.
• This work advances the development of compact and user-friendly biosensor instrumentation.