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2 March 1993 New optical sensors using circular zone plates with initial phase shift
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Proceedings Volume 1732, Holographics International '92; (1993)
Event: Holographics International '92, 1992, London, United Kingdom
We propose a new metrologic application of zone plates, using interferometric techniques, in order to detect changes in the refraction index of a dielectric parallel plate under the influence of the environmental parameters. The key of this kind of interferometer is a couple of circular zone plates produced with the proper combination of initial phase shift, in order to suppress the constant phase factors introduced with the system in the equilibrium state. In this way we are in quadratic condition and then we can measure the variation parameters with great accuracy and with the advantage of knowing the sign of it produced under external actions. The influence of the several fabrications parameters are discussed.
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Vincente Moreno de las Cuevas and Jesus Linares "New optical sensors using circular zone plates with initial phase shift", Proc. SPIE 1732, Holographics International '92, (2 March 1993);

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