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

: Schulz, U.; Kaiser, N.


Applied optics 36 (1997), Nr.4, S.862-865
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
ISSN: 2155-3165
Fraunhofer IOF ()
CR39; Feuchteaufnahme; Feuchtebarriere; Kunststoffbeschichtung; moisture absorption; plastics coatings; water permeability

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.