@inproceedings{36a617eaf5b9449782833c2bad11671d,
title = "Sand impact testing of durable coating on FLIR ZnS relevant to theLANTIRN E-O system window",
abstract = "Measurements of the influence of sand/dust impact erosion on FLIR ZnS, coated with a range of durable coatings, have been made using spectral transmission. This activity has been carried out as part of a program to identify a sand/dust and rain erosion protective coating, for use on the Martin Marietta LANTIRN E-O system front element ZnS/ZnSe laminate window. Assessments have been carried out against MIL STD 810E sand/dust erosion specification, using the Defence Nuclear Agency sand erosion facility. A range of sand particle diameters (< 38 to 177 micrometers ), and velocities 45 to 206 m/s), has been investigated. Three anti- reflective durable coatings have been tested: thorium fluoride, diamond like carbon (DLC -- supplied from three separate vendors), and boron phosphide (BP) overcoated with DLC. BP/DLC showed no significant erosion damage or change in transmission for the range of test conditions, while DLC and ThF4 exhibited significant erosion damage and consequent transmission reduction. A basic theory of solid particle impact is used to model transmission reduction in relation to coating hardness, velocity, and size of impacting sand particles. The concept of `erosion parameter and threshold velocity' is introduced, which provides a means of predicting transmission reduction for a range of sand erosion conditions.",
keywords = "Particles, Transmittance, Solids, Optical coatings, Forward looking infrared, Zinc, Boron",
author = "Waddell, {Ewan M.} and Gibson, {Desmond R.} and J. Meredith",
year = "1994",
month = sep,
day = "28",
doi = "10.1117/12.187377",
language = "English",
series = "Proceedings of SPIE",
publisher = "Society of Photo-Optical Instrumentation Engineers",
editor = "Paul Klocek",
booktitle = "Window and Dome Technologies and Materials IV",
address = "United States",
note = "SPIE's 1994 International Symposium on Optics, Imaging and Instrumentation ; Conference date: 24-07-1994 Through 29-07-1994",
}