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Near-infrared spectroscopy for monitoring water permeability of optical coatings on plastics

	Applied optics 36 (1997), No.4, pp.862-865 ISSN: 0003-6935 ISSN: 1539-4522 ISSN: 1559-128X
	Optical Interference Coatings Topical Meeting <1995, Tucson/Ariz.>

	English
	Conference Paper
	Fraunhofer IOF ()
	CR39; Feuchteaufnahme; Feuchtebarriere; Kunststoffbeschichtung; moisture absorption; plastics coatings; water permeability

Abstract
Near-infrared spectroscopy has been applied to determine the water content of plastic lenses. An analytical method is presented for monitoring the water permeability of thin layers on plastic optics by utilizing the reversible moisture absorption of organic polymers. As an example, scratch-restistant and antireflective layers on poly((diehylenglycol-bis(allylcarbonate)) lenses are investigated. The measurements demonstrate the relatively high water barrier of coatings deposited by plasma-ion assisted deposition compared with classical physical vapor deposition coatings and polysiloxane dip coatings.

: http://publica.fraunhofer.de/documents/PX-25521.html