Results 21 to 30 of about 1,555,141 (308)
Initial results of in vivo non-invasive cancer imaging in the human breast using near-infrared photoacoustics [PDF]
, 2007 Near-infrared photoacoustic images of regions-of-interest in 4 of the 5 cases of patients with symptomatic breasts reveal higher intensity regions which we attribute to vascular distribution associated with cancer.
Engh, Frank M. van den +6 more
core +13 more sources
Study on neural network algorithm for detecting respirable dust in photoacoustic cavity
AIP Advances, 2021 The traditional photoacoustic cavity has the advantages of simple structure, low cost, and easy integration with optical cavity technology, so it has significant advantages in the measurement of the optical characteristics of respirable dust. In order to
Huawei Jin +3 more
doaj +1 more source
Microphysical properties of carbonaceous aerosol particles generated by laser ablation of a graphite target [PDF]
Atmospheric Measurement Techniques, 2015 In this work various microphysical properties including mass concentration, size distribution and morphology of aerosol particles generated by laser ablation of a high purity graphite sample were investigated in detail. Supplementary chemical analysis of
T. Ajtai +11 more
doaj +1 more source
Dual-frequency modulated heterodyne quartz-enhanced photoacoustic spectroscopy.
Optics Express, 2023 A novel dual-frequency modulated heterodyne quartz-enhanced photoacoustic spectroscopy (DFH-QEPAS) was demonstrated for what we believe to be the first time in this study. In traditional H-QEPAS, the frequency of modulated sinusoidal wave has a frequency
Ziting Lang +5 more
semanticscholar +1 more source
Photoacoustic Spectroscopy Gas Detection Technology Research Progress
Applied Spectroscopy, 2023 Photoacoustic spectroscopy (PAS) can be utilized as an ultrasensitive gas detection method. The basic principles of gas detection using PAS are discussed in this paper.
S. Xiong +12 more
semanticscholar +1 more source
Nonlinear photoacoustic spectroscopy of hemoglobin [PDF]
Applied Physics Letters, 2015 As light intensity increases in photoacoustic imaging, the saturation of optical absorption and the temperature dependence of the thermal expansion coefficient result in a measurable nonlinear dependence of the photoacoustic (PA) signal on the excitation pulse fluence.
Danielli, Amos +4 more
openaire +5 more sources
Photoacoustics, 2020 Review sums up the application of photoacoustic and photothermal spectroscopies for the analysis and characterization of soils and soil organic matter and discusses the outlooks in this area.
Dmitry S. Volkov +2 more
doaj +1 more source
Optics Express, 2023 In addition to the atmospheric measurement, detection of dissolved carbon oxides and hydrocarbons in a water region is also an important aspect of greenhouse gas monitoring, such as CH4 and CO2.
Fupeng Wang +5 more
semanticscholar +1 more source
Micro-photoacoustic infrared spectroscopy [PDF]
Infrared Physics & Technology, 2018 Abstract This investigation establishes, for the first time, the viability of micro-photoacoustic infrared spectroscopy (microPAS). A cell that allows photoacoustic (PA) infrared spectroscopy measurements on small samples was constructed and tested in this work. The setup allows visualizing the sample and selecting specific measurement positions.
Tim May +8 more
openaire +2 more sources
On the accuracy of aerosol photoacoustic spectrometer calibrations using absorption by ozone [PDF]
Atmospheric Measurement Techniques, 2018 In recent years, photoacoustic spectroscopy has emerged as an invaluable tool for the accurate measurement of light absorption by atmospheric aerosol. Photoacoustic instruments require calibration, which can be achieved by measuring the photoacoustic ...
N. W. Davies +8 more
doaj +1 more source