An example of thermometry in volume by microwave radiometry

Area of Science:

• Physics
• Engineering
• Materials Science

Background:

• Accurate characterization of embedded thermal structures is crucial for various applications.
• Non-invasive methods are needed for analyzing thermal anomalies in homogeneous materials.
• Microwave radiometry offers potential for subsurface temperature and dimension determination.

Purpose of the Study:

• To develop and validate a method for determining the size, depth, and temperature of cylindrical thermal structures.
• To utilize microwave radiometric imaging for non-invasive subsurface analysis.
• To establish a relationship between radiometric data at different frequencies and thermal structure parameters.

Main Methods:

• Employing microwave radiometric imaging at 3 GHz to locate the thermal structure.
• Using image thresholding to determine the structure's diameter (D).
• Calculating the depth (z) from the ratio of maximal radiometric intensities at 1.5 and 3 GHz.
• Combining dimensional data (D, z) and radiometric intensities to compute the temperature anomaly (ΔT).

Main Results:

• Successfully demonstrated a method for determining the dimensions (D, z) of a cylindrical thermal structure.
• Quantified the temperature anomaly (ΔT) of the embedded structure using radiometric data.
• Established the utility of multi-frequency microwave radiometry for subsurface thermal analysis in water.

Conclusions:

• The proposed microwave radiometric method provides an effective means for non-invasively characterizing embedded thermal structures.
• The technique allows for accurate determination of size, depth, and temperature anomaly.
• This approach has significant implications for monitoring and analysis in materials science and engineering.