Enhancing Accuracy and Sensitivity of Temperature Gradient Measurements in DOE Schardin Schlieren No.2 Using Windowed Fourier Transform Method

Details Enhancing Accuracy and Sensitivity of Temperature Gradient Measurements in DOE Schardin Schlieren No.2 Using Windowed Fourier Transform Method Enhancing Accuracy and Sensitivity of Temperature Gradient Measurements in DOE Schardin Schlieren No.2 Using Windowed Fourier Transform Method

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1236..124a&link_type=abstract

INTERNATIONAL CONFERENCE ON ADVANCED PHASE MEASUREMENT METHODS IN OPTICS AND IMAGING. AIP Conference Proceedings, Volume 1236,

Physics

Optics

Fourier Transform Optics, Flow Visualisation, Heat Transfer, Holographic Interferometry, Optical Elements, Pattern Recognition, Fourier Optics, Flow Visualization And Imaging, Heat Conduction, Holographic Interferometry, Other Holographic Techniques, Optical Elements, Devices, And Systems, Pattern Recognition

Scientific paper

Recently heat flow visualization by transmitting a fringe pattern through a test section having non-uniform refractive index distribution was proposed. The fringe pattern is generated by the use of a diffractive optical element (DOE). Information about the temperature gradient is encoded in the phase of the deformed fringe pattern which is recorded from the other side of the test section. Phase of the recorded fringe pattern is then estimated usually using Fourier transform analysis method. The main feature of this measurement methodology is the flexibility in suiting to different heat transfer phenomena. However, it was found that the application in air may give rise to sensitivity problems. Consequently a combination of strategies such as modifying the experimental setup (introducing a distance between test section and ground glass), increasing the frequency of the projected pattern have been proposed for improving sensitivity. However, as these strategies have met with limited success, in this paper we propose the use of employing a different data processing algorithm, namely windowed Fourier transform, for enhancing the accuracy and the sensitivity of measurement. Simulation and experimental results of the system in making whole-field measurement of temperature gradient using Fourier transform and windowed Fourier transform algorithms are shown to validate the potential of the proposed strategy.

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