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Related Experiment Video

Updated: Jun 24, 2026

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

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Thermal-wave radar: a novel subsurface imaging modality with extended depth-resolution dynamic range.

Nima Tabatabaei¹, Andreas Mandelis

¹Department of Mechanical and Industrial Engineering, Center for Advanced Diffusion-Wave Technologies (CADIFT), University of Toronto, Toronto, Ontario M5S 3G8, Canada. nimat@mie.utoronto.ca

The Review of Scientific Instruments

|April 2, 2009

Summary

A new thermal-wave radar (TWR) method improves upon photothermal radiometry (PTR) by enhancing dynamic range and image resolution. This innovative technique offers significant advancements for material characterization and imaging applications.

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Last Updated: Jun 24, 2026

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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

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Published on: May 15, 2017

Area of Science:

* Physics
* Materials Science
* Engineering

Background:

* Photothermal radiometry (PTR) is a technique used for material characterization.
* Conventional PTR has limitations in dynamic range.
* Linear frequency modulated continuous wave (LFMCW) radar principles offer potential for improvement.

Purpose of the Study:

* To introduce a novel PTR method by integrating LFMCW radar concepts.
* To provide analytical solutions for heat diffusion in various solid materials.
* To demonstrate enhanced performance and propose resolution augmentation for the new method.

Main Methods:

* Development of a thermal-wave radar (TWR) system by combining LFMCW radar and PTR.
* Derivation of analytical solutions for heat diffusion problems in opaque and transparent solids.
* Implementation of simulations and experimental validation of the TWR method.

Main Results:

* The proposed TWR method shows a significant improvement in dynamic range compared to conventional PTR.
* Analytical solutions for heat diffusion were successfully derived.
* A practical method for augmenting TWR image resolution was developed and proposed.

Conclusions:

* The TWR method offers superior dynamic range and potential for enhanced resolution in photothermal imaging.
* This technique provides a valuable advancement for non-destructive material analysis.
* Further development of TWR holds promise for improved imaging and characterization capabilities.