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A new two-dimensional (2D) automatic spatial fringe analysis method or analysing a fringe image including images of obstructions, such as a blade in an interferogram of pressure distribution around turbine blades, is proposed. In the analysis, first, the image of the obstruction is removed from the fringe image using the characteristics of spatial fringe analysis method. Second, the problem with respect to the phase discontinuities of the principal values of the inverse-trigonometric function is discussed. Then, the processing paths for the automatic phase-unwrapping processing are found using the concept of the directed graph. Third, fringe analysis of an image including noise is discussed by the new method. Finally, automatic 2D spatial fringe analysis can be realized with the calculation along processing paths. T h e experimental results show that the 2D fringe analysis for the image with obstructions can be performed accurately and automatically by the method proposed. In addition to the experiment, processing of an image with noise is discussed using the simulation by the proposed method. The simulation shows that this method is successful for processing an image with noise. An example of the application of this method to investigate the radiant heat of integratedcircuit chips is introduced.

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This study focuses on the fundamental characteristics of DME (Dimethyl Ether) combustion, aiming at the development of low-NOx multi-port burner suitable for the tube-nested combustor. In the tube-nested combustion, the water tubes are moved into the furnace closely to the burner to cool the burning flame directly in the field of burning reaction leading to NOx reduction. To prevent the unburned combustibles emission, the diffusion burner used in the tube-nested combustor needs a high performance of the fuel-air mixing. Multi-port burner consists of a fuel-port and surrounding multi-airports , which induce a strong re-circulation flow. Thus the fuel-air mixing is enhanced so that the thermal NOx and CO emissions are significantly reduced. The NOx emission of the DME from the co-axial diffusion burner was over 130 ppm at 0% O 2. On the other hand, NOx emission of DME from the multi-port burner was reduced to 60 ppm at 0% O 2. With the help of the tube-nested combustion, NOx emission of DME was further reduced to 20 ppm at 0% O 2 .