The Quantitative Measurement Of Temperature Distribution In 3-D Thermal Field With High-Speed Real-Time Holographic Interferometry

1989 ◽  
Author(s):  
Wu Ji-zong ◽  
Fu Wei-qiao ◽  
Wu Qin
Keyword(s):  
Temperature Distribution ◽  
Real Time ◽  
Holographic Interferometry ◽  
High Speed ◽  
Quantitative Measurement ◽  
Thermal Field

Ultra High Speed Real-Time Holographic Interferometry

1979 ◽  
Author(s):  
T. Uyemura ◽  
Y . Yamamoto ◽  
N . Yokoyama ◽  
S. Tochiori
Keyword(s):  
Real Time ◽  
Holographic Interferometry ◽  
High Speed ◽  
Ultra High Speed

scholarly journals Real-Time and Quantitative Measurement of Crack-Tip Stress Intensity Factors Using Digital Holographic Interferometry

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Haiting Xia ◽  
Rongxin Guo ◽  
Feng Yan ◽  
Heming Cheng
Keyword(s):  
Stress Intensity ◽  
Real Time ◽  
Phase Difference ◽  
Holographic Interferometry ◽  
Quantitative Measurement ◽  
Crack Tip ◽  
Mode I ◽  
Mode I Crack ◽  
Open Issue ◽  
Crack Tip Stress

Detection of the crack in an object is a critical problem for the health monitoring of a transparent object. The real-time and quantitative measurement of the crack-tip stress intensity factor (SIF) remains an open issue. In this paper, an approach for real-time and quantitative measurement for the SIFs of a Mode I crack is presented based on digital holographic interferometry (DHI). A transmission digital holographic system is established to measure the phase difference of an object wave during loading. The expression to achieve the SIF from the phase difference is formulated. To enhance the accuracy of measurement, calibrated phase unwrapping based on least-squares and iteration and median filtering is applied to retrieve the actual phase from the noisy wrapped one. The SIFs of the Mode I crack in a transparent polymethyl methacrylate (PMMA) specimen are measured by this approach. The results are compared with the theoretical ones to demonstrate the feasibility of the proposed approach.

Natural Convection in Square Cavities Heating From Below: Investigation of Three Different Values of the Heat Source Length

2003 ◽  
Author(s):  
Massimo Paroncini ◽  
Barbara Calcagni ◽  
Federico Marsili
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Temperature Distribution ◽  
Heat Source ◽  
Real Time ◽  
Holographic Interferometry ◽  
Low Noise ◽  
Heat Transfer Analysis ◽  
Double Exposure ◽  
Square Enclosure

The objective of the present study is to gain some insight into fluid motion and heat transfer phenomena in the case of a square enclosure heated from below and symmetrically cooled from the sides; the effects of different values of the heat source is experimentally investigated. The localized heating is a centrally located heat source on the bottom wall; three different values of the heat source length (1/5, 2/5, 3/5 of the wall) are considered. The test cell is a square enclosure filled with air with isothermal side walls at equal temperatures Tc; the remaining vertical walls are realized with glass to allow optical access to the cavity. The top and bottom surfaces of the enclosure are made of plexiglass and, except for the heated section, are considered to be adiabatic. The located heat source is assumed to be isothermal at a temperature Th. The temperature distribution is experimentally measured by real-time and double-exposure holographic interferometry. The real-time technique is used in order to reveal the presence of plume oscillations while the double-exposure technique is used for steady-state measurements. Holographic interferometry shows the typical advantages over the classical optical techniques, such as high precision and sensitivity, very low noise level, and the possibility of displaying the temperature distribution across the whole investigated region. The objective of the heat transfer analysis is the experimental investigation of the Nusselt number distribution around the cavity at various Rayleigh numbers and several dimensions of the heat source. Different convection forms were obtained depending on Ra and on the heat source length. The Nusselt number was evaluated on the heat source surface and it showed a symmetrical form rising near the heat source borders.

Application Of High-Speed Real-Time Holographic Interferometry To Dynamic Testing

1989 ◽  
Author(s):  
Li Yulin ◽  
Ji Zhongying ◽  
Wang Zhengrong ◽  
Kong Yue ◽  
Liu Gaixia
Keyword(s):  
Real Time ◽  
Holographic Interferometry ◽  
High Speed ◽  
Dynamic Testing
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