Development of Optophone with No Diaphragm and Application to Sound Measurement in Jet Flow

<table>Directivity in the vertical and horizontal planes. (a) Directivity in the vertical plane perpendicular to laser beam axis, (b) directivity in the horizontal plane involving laser beam axis.</table>

Advances in Acoustics and Vibration

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Figure 12

Figure 12: Development of Optophone with No Diaphragm and Application to Sound Measurement in Jet Flow 