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A prism fingerprint sensor is described which uses a holographic grating glued to a right angled prism. The quality of the fingerprint is very good; the pores on the ridges can be seen.
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Ramendra Deo Bahuguna, Tom Corboline, "Holographic fingerprint sensor," Proc. SPIE 2863, Current Developments in Optical Design and Engineering VI, (1 November 1996); https://doi.org/10.1117/12.256219