Since electronic speckle pattern interferometry (ESPI) was presented near 20
years ago , some important applications have been found, and at least two kinds
of ESPI instrument have been produced. In an ESPI system, imaging lens is one of key
parts. In this paper, authors will study the effect of the resolving power of lens
on ESPI fringe patterns, so as to find what lens the ESPI system needs. This research
would be significant for designing an economical lens fitting to the ESPI system.
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