Photoacoustic spectroscopy
Rapid estimation of sugar release from winter wheat straw during bioethanol production using FTIR-photoacoustic spectroscopy
... infrared photoacoustic spectroscopy (FTIR-PAS) was combined with advanced chemometrics to develop calibration models predicting the amount of sugars released after pretreatment and enzymatic hydrolysis of ...
12
Rapid diagnosis of nitrogen status in rice based on Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS)
... red photoacoustic spectroscopy (FTIR-PAS) has been effectively applied in many fields, such as analyzing soil physical and chemical properties [12, 13], identifica- tion of plant diseases [14], gas ...
10
Depth profiling of weathered tropical wood using Fourier transform infrared photoacoustic spectroscopy
... infrared photoacoustic spectroscopy (FTIR-PAS) was carried out to obtain information on the chemical changes caused by ...the photoacoustic probing depth during relatively short weathering ...
6
Evaluating biases in filter-based aerosol absorption measurements using photoacoustic spectroscopy
... to photoacoustic spectroscopy (PAS) measurements for aerosols over the Gulf of Mexico, which included BC, nitrate, sulfate and organic aerosols from shipping emis- ...
18
A 3D-printed miniature gas cell for photoacoustic spectroscopy of trace gases
... Photoacoustic spectroscopy (PAS) has been continually developed as a measurement tool for trace gas detection since its discovery by Bell in 1880 ...laser spectroscopy, the advantages of PAS include ...
5
Diode laser photoacoustic spectroscopy of CO2, H2S and O2 in a differential Helmholtz resonator for trace gas analysis in the biosciences and petrochemistry
... absorption spectroscopy [32, ...a photoacoustic scheme, however, are (i) convenience and lower costs; near-IR laser sources and detectors are in general much less than one tenth of the costs of a comparable ...
12
Enhanced photoacoustic spectroscopy sensitivity through intra-cavity OPO excitation
... Results achieved in this study demonstrated significant improvement of photoacoustic spectroscopy sensitivity, resulting from the intracavity location of the spectrophone. However, there are still ...
8
Phase References and Cell Effects in Photoacoustic Spectroscopy
... The potential reference materials studied included car- bon-black-coated plastic lms, carbon-black powder, car- bon-black- lled rubber, glassy carbon, and graphite, all of which have been used as references for ...
10
Quantitative evaluation of broadband photoacoustic spectroscopy in the infrared with an optical parametric oscillator
... Abstract: Photoacoustic spectroscopy allows the identification of specific molecules in gases. We evaluate the spectral resolution and detection limits for a PAS system in the broadband infrared wavelength ...
29
Practical analysis of polymers with depth varying compositions using Fourier transform infrared photoacoustic spectroscopy (plenary)
... The phase component of the photoacoustic signal also has important compositional information related to depth. The phase delay for a very strong absorbance peak ap- proaches a phase shift of 90°, whereas a very ...
9
Cavity-enhanced raman and helmholtz resonator photoacoustic spectroscopy to monitor the mixed sugar metabolism of E. coli
... The DHR setup has been described in detail in a previous publication. 20 In short, optical absorption in a di ff erential Helmholtz resonator (Figure 1b) creates sound waves (the photoacoustic e ff ect) in chambers ...
10
Rapid Analysis of Wood Using Transient Infrared Spectroscopy and Photoacoustic Spectroscopy with PLS Regression Stanley J. Bajic
... In the forest products industry, improved methods are needed for rapid analysis of wood and paper products. Currently, the best methods for determining chemical and physical properties of wood-based materials require ...
7
Photoacoustic Imaging with a Line Focus Laser Beam for Rapid Inspection and Tomographic Characterization of Simulated Surface and Undersurface Defects
... In photoacoustic spectroscopy, the PA signal in opaque solids (including metals) is generally propor- tional to the product of the absorption coefficient α of the specimen (assuming that the surface defect ...
8
Resonator probe for photoacoustic measurement
... of photoacoustic spectroscopy, there are a few shortcomings with the ...nant photoacoustic cells are especially susceptible to this flaw, exhibiting a change in resonant frequency of about 1% for ...
96
Photoacoustic Detection in the Michelson Interferometer Cavity
... report photoacoustic (PA) signal detection in a cell placed within the Mi- chelson interferometer cavity in an attempt to relate photoacoustic effect to the Michelson fringe shift as a result of changes in ...
11
Principal Longevity, Leadership Behaviors, and Student Academic Achievement
... In spite of several technological advantages of III-V Nitride MEMS, of which a microcantilever is a simple example, only a handful of studies have been reported on their deflection characterization in static mode and ...
222
Pulsed Laser Generation and Optical Fibre Detection of Thermoelastic Waves in Arterial Tissue
... pulsed photoacoustic spectroscopy and the feasibility of its practical in vivo implementation via the concept of the photoacoustic ...that photoacoustic spectroscopy can be used to ...
192
Detecting Photoacoustic Signals of Sulfur Hexafluoride at Varying Microphone Positions
... Photoacoustic spectroscopy was used to test the photoacoustic properties of sulfur hexafluoride, an optically thick and potent greenhouse ...the photoacoustic effect of sulfur hexafluoride, ...
5
A semi-anthropmorphic photoacoustic breast phantom
... is photoacoustic tomography ...the photoacoustic (PA) eect [9], which is exploited to combine optical excitation with acoustic ...The photoacoustic wave generation and propagation under both thermal ...
117
Multi Contrast Photoacoustic Computed Tomography
... To date, photoacoustic tomography (PAT) is the only high-resolution optical imaging modality that breaks the optical diffusion limit [40]. In PAT, the energy of incident photons is absorbed by chromophores inside ...
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