A5046121183- Thermography and Photoacoustic Techniques
- Photoacoustic and Ultrasonic Imaging
- Spectroscopy Techniques in Biomedical and Chemical Research
- Ultrasonics and Acoustic Wave Propagation
- Laser Material Processing Techniques
- Calibration and Measurement Techniques
- Infrared Thermography in Medicine
- Silicon and Solar Cell Technologies
- Spectroscopy and Laser Applications
- Advanced Chemical Sensor Technologies
- Optical Imaging and Spectroscopy Techniques
- Chalcogenide Semiconductor Thin Films
- Advanced Sensor Technologies Research
- Gas Sensing Nanomaterials and Sensors
- Integrated Circuits and Semiconductor Failure Analysis
- Optical and Acousto-Optic Technologies
- Force Microscopy Techniques and Applications
- Analytical Chemistry and Sensors
- Photonic and Optical Devices
- Thermal properties of materials
- Transition Metal Oxide Nanomaterials
- Optical Coherence Tomography Applications
- Thin-Film Transistor Technologies
- thermodynamics and calorimetric analyses
- Advanced Fluorescence Microscopy Techniques
University of Toronto
2016-2025
Xidian University
2024-2025
Xanadu Quantum Technologies (Canada)
2008-2022
Keysight Technologies (United States)
2022
University of New Brunswick
1999-2021
University of Electronic Science and Technology of China
2014-2021
Harbin Institute of Technology
2019
Helmholtz Zentrum München
2015-2018
Technical University of Munich
2015-2018
Chengdu University
2016
Absorption, Energy Transfer, and Excited-State Relaxation. Hydrodynamic Relaxation: Heat Transfer Acoustics. Optical Principles for Photothermal Spectroscopy. Temperature Change Elements in Homogeneous Samples. Spectroscopy Analytical Measurement Data Processing Considerations. Applications. of Heterogeneous Index.
Light absorption by a solid material and conversion of part, or all, the optical energy into heat due to nonradiative deexcitation processes within can give rise an electrical signal in pyroelectric thin film contact with sample. This effect forms basis new spectroscopic technique for study condensed phase matter. A one-dimensional theory is presented, which describes dependence on optical, thermal, geometric parameters solid/pyroelectric system. Specifically, examines conditions under...
This article describes a 10-year cooperative effort between the U.S. National Institute of Standards and Technology (NIST) five major journals in field thermophysical thermochemical properties to improve quality published reports experimental data. The are Journal Chemical Engineering Data, Thermodynamics, Fluid Phase Equilibria, Thermochimica Acta, International Thermophysics. history this unique cooperation is outlined, together with an overview software tools procedures that have been...
This paper reviews the development, history, theoretical basis, and experimental performance of solid-state hydrogen detectors under flow-through conditions available to date such as pyroelectric, piezoelectric, fiber optic, electrochemical devices. Semiconductor will only be reviewed briefly, excellent on this subject already exist. In view fact that almost all devices discussed later in use Pd a trap, we devote subsection examining role palladium catalyst well some characteristics Pd-H2...
One major problem of frequency-domain photothermal radiometry, or alternatively in two-dimensional lock-in thermography, is the compromise one has to make between dynamic range (probing depth) and depth resolution. The thermal-wave radar incorporates chirped excitation through matched filtering maintain good resolution inside a sample. This letter experimentally demonstrates advantages modulation introduces thermophotonic modality based on an emissivity-normalized, higher-dynamic-range...
In this study, we report for the first time use of silica-coated superparamagnetic iron oxide nanoparticles (SPION) as contrast agents in biomedical photoacoustic imaging. Using frequency-domain correlation (the radar), investigated effects nanoparticle size, concentration and biological media (e.g. serum, sheep blood) on response turbid media. Maximum detection depth minimum measurable SPION were determined experimentally. The nanoparticle-induced optical ex vivo dense muscular tissues...
Condition monitoring, nondestructive testing, and fault diagnosis are currently considered crucial processes for on-condition maintenance (OCM) to increase the reliability availability of wind turbines reduce energy generation cost. Carbon fiber reinforced plastics (CFRPs) have been increasingly used fabricate turbine blades. Delamination-type damage is inevitable during manufacture or in-service a CFRP blade. This inner (subsurface) flaw, usually difficult be detected by artificial visual...
Enhancement of trace gas detectability using photoacoustic spectroscopy requires the effective suppression strong background noise for practical applications. An upgraded infrared broadband detection configuration was investigated based on a Fourier transform (FTIR) spectrometer equipped with specially designed T-resonators and simultaneous differential optical measurement capabilities. By acetylene local air as appropriate samples, detectivity mode demonstrated to be far better than pure...
We present a sensitive and compact quantum cascade laser-based photoacoustic greenhouse gas sensor for the detection of CO
Abstract Infrared thermography has been widely applied in real industrial inspections of aerospace, energy management systems, engines and electric systems. However, the two-dimensional imaging character this modality limits its development. Here, a technique named frequency multiplexed photothermal correlation tomography (FM-PCT) was developed to enable non-destructive contactless cross-sectional for manufactured material evaluation characterization. By combining advantages pulsed...
Comprehensive sevoflurane monitoring (CSM, concentrations from parts per billion to percent) is essential for the therapeutic diagnosis of anesthetized patients and occupational exposure monitoring. Photoacoustic spectroscopy, with its advantages high sensitivity, wide dynamic range, miniaturization, real-time, holds unique potential CSM. A highly sensitive resonator a small volume an optimal choice regarding limited exhaled gas amount. Wavelength modulation not suitable detecting trace...
quantitative analysis of linear temperature-dependent coupled thermoelectronic diffusion waves in the generation laserinduced IR photothermal radiometric signal from a photoexcited, plasmawave- dominated, semi-infinite semiconductor Si wafer is presented. The strong coupling between (usually assumed decoupled) carrier and thermal wave transport equations accounted for explicitly range violation Vasil’ev-Sandomirskii condition studied. Thermoelectronic found to degrade sensitivity...
A thermal-wave resonant cavity was constructed using a thin aluminum foil wall as the intensity-modulated-laser-beam induced oscillator source opposite pyroelectric polyvilidene fluoride acting signal transducer and standing-wave-equivalent generator. It shown that scanning frequency of oscillation produces fundamental higher overtone extrema albeit with increasingly attenuated amplitude—a characteristic behavior. Experimentally, length produced sharp lock-in in-phase resonance simple...
Laser-induced infrared photocarrier radiometry (PCR) is introduced theoretically and experimentally through deep subsurface scanning imaging signal frequency dependencies from Si wafers. A room-temperature InGaAs detector $(0.8--1.8\ensuremath{\mu}\mathrm{m})$ with integrated amplification electronics used instead of the liquid-nitrogen-cooled HgCdTe photodetector $(2--12\ensuremath{\mu}\mathrm{m})$ conventional photothermal radiometry. PCR measures purely electronic carrier-wave (CW)...
The concept of waves is an integral part our scientific culture and has nourished physicists, pure applied alike, for centuries. Many important discoveries in physics, including quantum mechanics, have involved wave phenomena. owes some its success to mathematical tractability. Linear equations—the sort that describe the transmission sound radio through air—contain a nonzero second-order time derivative, which gives rise mathematically rich familiar array properties we associate with waves,...
Combining the ideas behind linear frequency modulated continuous wave radars and domain photothermal radiometry (PTR), a novel PTR method is introduced. Analytical solutions to heat diffusion problem for both opaque transparent solids are provided. Simulations experimental results suggest significant improvement in dynamic range when using thermal-wave radar (TWR) instead of conventional PTR. A practical TWR image resolution augmentation proposed.
Photoacoustic spectroscopy provides information about both the amplitude and phase of response a system to an optical excitation process. This paper presents theoretical model photoacoustic processes in frequency domain which includes relaxation time radiationless deexcitations two-layer absorbing system. Emphasis is placed on effect these conditions signal utility this measurement evaluating material parameters. Circumstances under may be used measure absorption coefficient solid...
Energy transport in diffusion-wave fields is gradient-driven and therefore diffuse, yielding depth-integrated responses with poor axial resolution. Using matched-filter principles, we propose a methodology enabling these parabolic energy to exhibit localization akin propagating hyperbolic wave fields. This not only improves resolution but also allows for deconvolution of individual superposed axially discrete sources, opening new field depth-resolved subsurface thermal coherence tomography...
Colloidal quantum dots (CQDs), which benefit from a size-tuned bandgap, are solution-processed material for infrared energy harvesting. This characteristic enables the fabrication of solar cells that form tandem devices with silicon. Unfortunately, in case CQDs having diameters sufficiently large (>4 nm) so nanoparticles absorb light well beyond silicon's conventional ligand exchanges fail. Here we report strategy wherein short-chain carboxylates, used as steric hindrance controller,...