Frequency Multiplexed Photothermal Correlation Tomography in Infrared Thermography
Posted: 2025-6-12
Source:
IOP.org
Infrared thermography has been widely applied in real industrial inspection of aerospace, energy management systems, engines, and electric systems. However, two-dimensional imaging modality limits its development. Here, a technique named frequency multiplexed photothermal correlation tomography (FM-PCT) was developed to enable non-destructive and contactless cross-sectional imaging for manufactured material evaluation and characterization.
By combining advantages of photothermal tomography and pulsed thermography, FM-PCT facilitates the generation of three-dimensional thermal images through temporal superposition (stacking) of two-dimensional images from sequential subsurface depths. FM-PCT image processing involves pulsed excitation signals to which frequency delay and matched filtering techniques are applied.
Major features of FM-PCT are high-resolution three-dimensional tomographic imaging under low camera frame-rate conditions with self-correcting capability for diffusion (blurring) correction of subsurface images due to cross-correlation processing of individual frequencies in the Fourier decomposition spectrum of the excitation pulse. Furthermore, FM-PCT extends truncated-correlation photothermal coherence tomography from chirp and pulsed signals to more general linear heating sources.
Lock-in thermography and x-ray computed tomography validation demonstrate that 3D FM-PCT imaging accurately reveals subsurface discontinuities/defects in solids despite the diffusive nature of thermal-wave imaging.
Highlights
FM-PCT combines the strengths of enhanced truncated-correlation photothermal coherence tomography (eTC-PCT) and pulsed phase thermography (PPT)
FM-PCT not only generates 3D cross-sectional images at different subsurface depths accurately, but also contains unique depth resolution under low frame rate conditions
FM-PCT, for the first time, establishes itself as a leading candidate for fast-turnaround quality control applications
FM-PCT extents the photothermal excitation to linear heating sources
FM-PCT offers faster sampling speeds and calculation time, and can be used with more economical mid-IR cameras than required by today's thermography state-of-art
Click the link above to read the full article.
By combining advantages of photothermal tomography and pulsed thermography, FM-PCT facilitates the generation of three-dimensional thermal images through temporal superposition (stacking) of two-dimensional images from sequential subsurface depths. FM-PCT image processing involves pulsed excitation signals to which frequency delay and matched filtering techniques are applied.
Major features of FM-PCT are high-resolution three-dimensional tomographic imaging under low camera frame-rate conditions with self-correcting capability for diffusion (blurring) correction of subsurface images due to cross-correlation processing of individual frequencies in the Fourier decomposition spectrum of the excitation pulse. Furthermore, FM-PCT extends truncated-correlation photothermal coherence tomography from chirp and pulsed signals to more general linear heating sources.
Lock-in thermography and x-ray computed tomography validation demonstrate that 3D FM-PCT imaging accurately reveals subsurface discontinuities/defects in solids despite the diffusive nature of thermal-wave imaging.
Highlights
FM-PCT combines the strengths of enhanced truncated-correlation photothermal coherence tomography (eTC-PCT) and pulsed phase thermography (PPT)
FM-PCT not only generates 3D cross-sectional images at different subsurface depths accurately, but also contains unique depth resolution under low frame rate conditions
FM-PCT, for the first time, establishes itself as a leading candidate for fast-turnaround quality control applications
FM-PCT extents the photothermal excitation to linear heating sources
FM-PCT offers faster sampling speeds and calculation time, and can be used with more economical mid-IR cameras than required by today's thermography state-of-art
Click the link above to read the full article.
