Non-contact measurement method of liquid composition using microwave radar cross-section

Area of Science:

• Applied Physics
• Electromagnetics
• Chemical Sensing

Background:

• Traditional near-infrared spectroscopy has limitations for certain liquid analyses.
• Non-contact detection methods are crucial for sensitive or contained samples.
• Microwave detection offers a promising alternative for material characterization.

Purpose of the Study:

• To introduce and validate Microwave Radar Cross-section (RCS) measurement for non-contact liquid composition detection.
• To explore the correlation between liquid polarity and microwave scattering.
• To establish microwave radar as a viable technology for precise liquid analysis.

Main Methods:

• Utilized Microwave Radar Cross-section (RCS) measurement technology.
• Conducted experimental analysis correlating polar substances (e.g., total acid content) with radar scattering.
• Performed theoretical derivations and experimental validations on electromagnetic property variations and echo loss.
• Tested the system with solutions of varying ethanol and acetic acid concentrations.

Main Results:

• Demonstrated a significant correlation between polar substances and radar scattering capability.
• Showcased microwave radar's effectiveness in reflecting liquid polarity.
• Validated that differences in electromagnetic properties affect echo loss and RCS levels.
• Achieved an accuracy of 2% in RCS measurements for liquid composition detection.

Conclusions:

• Microwave radar RCS measurement technology is highly effective for non-contact liquid composition detection.
• The technology accurately reflects liquid polarity and component variations.
• This provides a new technological foundation for precise, non-contact analysis of liquid mixtures.