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A cylindrical aluminum vessel with an inside diameter of 100 cm and a height of 55 cm is used.Radiation through the air is minimized by appropriately selecting the distances from the resonatorsurface to the outer cylindrical steel chamber and the additional reflecting surfaces.Therefore measure-ments can be made at atmospheric pressure.The lowest decay rates obtained at approximately 3 and7 kHz are 0.15 dB/s and 0.30 dB/s,respectively. 相似文献
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