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1.
  • Li, Xide, et al. (författare)
  • Three-Dimension Reconstruction of Wave-Front and Pressure Field of Space-Diffraction-Sound-Wave by Computerized Tomography
  • 1998
  • Ingår i: Guangxue Xuebao. - 0253-2239. ; 18:12, s. 1669-1675
  • Tidskriftsartikel (refereegranskat)abstract
    • The pulsed-carried ESPI (electron speckle photographic interference) and the with computerized tomography (CT) technique were used to evaluate the three-dimensional wavefront and pressure field distribution of diffraction field of acoustic wave through different aperture masks. Experiments were carried out by using an electrical discharge between two electrodes as sound source. The property of CT reconstruction under the conditions of noise projection was discussed
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2.
  • Zhang, Hao, et al. (författare)
  • Non-invasive optical detection of oxygen content in food packages using gas in scattering media absorption spectroscopy
  • 2016
  • Ingår i: Guangxue Xuebao/Acta Optica Sinica. - 0253-2239. ; 36:2
  • Tidskriftsartikel (refereegranskat)abstract
    • Food quality is greatly dependent on the security of the food packaging process,which has been widely developed to inhibit food spoilage and to prolong the shelf life for food products. Gas in scattering media absorption spectroscopy is used as an optical noninvasive method to estimate the gas content in food packages. A diode laser with central wavelength of 760 nm is used to record an oxygen spectroscopic signal, and then to estimate the oxygen content by investigating the gas exchange in the package. The experimental results show that the technique can be used to determine the oxygen concentration and to assure the integrity and security of food packages.
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