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Coherence length as a figure of merit in multireference near-field acoustical holographya)
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18.It should be noted that this result differs from that achieved by Gardner, who performed this analysis for a more specific source and set of reference configurations. This work builds upon those intial investigations.
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Multireference partial field decomposition (PFD) can be used to generate coherent holograms for near-field acoustical holography measurements. PFD is most successful when the reference array completely senses all independent subsources, but meeting this requirement is not straightforward when the number of subsources and their locations are ambiguous (such as in aeroacoustic sources). A figure of merit based on spatial coherence lengths, called references per coherence length (RPL C ), is a useful metric to guide inter-reference spacing in the array design. For numerical, extended, arbitrarily coherent sources one reference per coherence length results in a sufficient reference array.
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