Analysis of oxidation products in petroleum fuels and oils by photoacoustic spectroscopy
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Photoacoustic and spectrophotometric methods have been applied to evaluate the properties changes of petroleum fuels and oils after oxidation. Samples were oxidated under laboratory and real working condition. The preliminary results of experimental investigations are presented.Keywords:
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The development and applications of photoacoustic spectroscopy gas sensors is present. The theory of the photoacoustic gas sensors and the advantages of different photoacoustic sensors are discussed. This work focuses on the one-dimension PA cell and has given the model simulation of it. Based on recent instances, the important and difficult points in the research of photoacoustic sensors are given out and some possible methods to improve them are discussed. And the conclusion is that the MEMS photoacoustic sensors have many advantages and will be the future studying trending.
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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. First, the basic instrumentation for a PAS gas detection system is introduced focusing on the photoacoustic cell. The discussion includes non-resonant photoacoustic cells and the different types of resonant photoacoustic cells, including the longitudinal photoacoustic cell, the Helmholtz photoacoustic cell, the T-type photoacoustic cell, and the high-frequency resonant photoacoustic cell. The basic working principles of each of these, cells as well as the advantages and disadvantages of photoacoustic cells are discussed, and the development of newer types of photoacoustic cells in recent years is outlined in detail. This review provides detailed reference information and guidance for interested researchers who would like to design and build advanced photoacoustic cells for gas detection.
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Photoacoustic effect
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The goal of our investigations is to evaluate the photoacoustic spectroscopy technique a new tool for examination of technical working fluids properties. In the paper the last of spectrophotometric and photoacoustic measurements, concerning properties changes of oils and fuels after oxidation are presented. The photoacoustic experimental investigations of lubricating oils degradation in various conditions are outlined.
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Photoacoustic spectroscopy can be well applied in research of plant photosynthesis,a lot of study has be proven that,it can be more effective than traditional detection method.Photoacoustic cell is the core components in photoacoustic spectrometer.The design of photoacoustic cell directly influences the results of experiments.we summarized the design method of photoacoustic cell applicable in plant photosynthesis and its key problems which need attention,and prospected the combination of photoacoustic spectroscopy and other detection methods,put forward photoacoustic cell's subsequent design should be paid special attention to real-time on-line detection and its correlative technique problem.
Photoacoustic Spectroscopy
Photoacoustic effect
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Photoacoustic spectroscopy based on the photoacoustic effect is the combination of optical imaging and acoustical imaging, which has become a powerful medical diagnosis tool to distinguish different tissues and components with several different wavelength photoacoustic images. But photoacoustic spectroscopy is limited by the scanning speed, system stability and signal accuracy. To solve these limitation problems, in this paper we propose a new method called photoacoustic double spectrum analysis which can greatly improve the image contrast and identification capability with quantitative analysis of the detected photoacoustic signal frequency. The final experimental results indicate that this method has the feasibility to distinguish different tissues quickly and easily with better contrast, which will be helpful for improving the applications of photoacoustic imaging in various branches of physics, biology, engineering, medicine, etc. We also expect the theoretical and experimental research proposed in this paper to establish the foundation and method for photoacoustic frequency imaging.
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It is demonstrated that the photoacoustic spectrum of a strongly fluorescing compound which gives a poor photoacoustic response is very sensitive to the presence of another compound with low fluorescence quantum yield. Deliberate addition of such compounds can assist in detection and identification of compounds of low ’’photoacoustic yield.’’ It is also shown that photoacoustic spectroscopy is well suited to the study of energy transfer to acceptor molecules, which have a negligible fluorescence quantum yield.
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The photoacoustic spectroscopy (PAS) with piezoelectric transducer was employed to evaluate band gap energies in Zn1−xBexSe mixed crystals of different composition. The spectra were measured at 300 K and 90 K using continuos wave excitation. The Jackson-Amer model of photoacoustic effect was applied. The increase of the band-gap energy with increasing Be content is observed. The photoacoustic results are compared with those from photoluminescence spectra.
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We present in this paper a review of our works on resonators-based photoacoustic spectroscopy. We have worked on quartz enhanced photoacoustic spectroscopy (QEPAS) for many years, then developed in 2018 a new technique based on silicon mechanical resonator (MEMSPAS), dedicated to photoacoustic sensing. We will present some of the applications of these techniques, especially breath analysis by biomarkers detection for medical diagnosis.
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Photoacoustic effect
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