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首页> 美国政府科技报告 >Experimental Method to Measure Low Frequency Sound Radiation - Nearfield Acoustical Holography
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Experimental Method to Measure Low Frequency Sound Radiation - Nearfield Acoustical Holography

机译：测量低频声辐射的实验方法 - 近场声全息

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A technique called Nearfield Acoustical Holography (NAH) has been developed. The technique, a significant improvement over conventional holography, is not subject to the wavelength resolution limitation associated with conventional techniques. An exact formulation of the Green's function propagator allows reconstructions of the entire pressure, particle velocity, and vector intensity fields. The vector intensity may be plotted to show the flow of acoustic energy around and away from a source. On some sources, these mappings reveal areas of non-radiating, circulating energy flow. These areas may have large pressure or velocity amplitudes and negative intensity regions that previously led to misconceptions about the production of acoustic energy.

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