Optical testing of ultrasonic phase gratings using a Fresnel diffraction method |
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Authors: | K Patorski |
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Institution: | Warsaw Technical University, Institute of Design of Precise and Optical Instruments, 02-525 Warsaw, 8 Chodkiewicza Str., Poland |
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Abstract: | A simple optical method is proposed for studying the Raman-Nath parameter of plane, sinusoidal, ultrasonic beams. The Fresnel diffraction field of a continuous ultrasonic grating illuminated by a collimated laser beam is measured by a photodetector placed mid-way between the self-image planes of the grating. Measurement of the amplitude of the fundamental of the output signal enables the absolute determination of the depth of phase modulation. A comparison of the proposed method with the techniques discussed in the literature is presented. |
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