Study on Measurement Techniques of Concentration Fluctuations Using Video Images

• OHBA Masaaki

  Tokyo Institute of Polytechnics

Bibliographic Information

Other Title

• 133 ビデオ画像による濃度変動量の測定方法に関する研究

Abstract

Video imaging techniques were used to measure concentration fluctuations including concentration spectra in the wake of a stack model and a rectangular building model using a high-speed video camera. From the experiments the following results were obtained. The image signals had linear relationships with gas concentrations for mean values. The distance extinction of laser light due to light scattering had negligible effects on the linearity under the experimental conditions. The video image spectra were also found to coincide well with those measured by a high-response hydrocarbon analyzer. The peak frequency in the wake existed in the range from several Hz to 20 Hz for the reference velocity of 1 m/s. For the standard deviation of image signals the linearities showed to decrease in comparison with those for mean values. A free stagnation point existed at the point of X/H=0.1 and Z/H=0.7 in the wake of the rectangular building model.

Journal

• Journal of the Visualization Society of Japan

  Journal of the Visualization Society of Japan 15 (Supplement1), 257-260, 1995

  The Visualization Society of Japan

Details

• CRID: 1390001204618625920
• NII Article ID: 10002673500
• NII Article ID: 130003443076
• NII Book ID: AN10374478
• DOI: 10.3154/jvs.15.supplement1_257
• ISSN: 1884037X
• ISSN: 09164731
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed