TY - CONF T1 - Non-invasive monitoring of free surface film layer spread using an ultrasonic continuously repeated chirp longitudinal wave JO - STLE 2019 - 74th Annual Meeting and Exhibition of the Society of Tribologists and Lubrication Engineers PY - 2019/01/01 AU - Kanja J AU - Li X AU - Brunskill H AU - Hunter A AU - Dwyer-Joyce R ED - Y2 - 2025/05/16 ER -