This　article　describes　the　measurement　of　lubricant　film　thickness　distribution　in　a　roller　bearing　by　using　two　juxtaposed　transducers,　which　are　excited　by　a　new　ultrasonic　pulse　receiver　with　a　maximum　pulse　repetition　rate　(PRR)　of　100　kHz.　The　experimental　results　demonstrate　the　feasibility　and　advantage　of　this　method　with　high　PRRs.　The　influence　of　rotating　speed　and　radial　load　on　the　measured　film　thickness　are　shown　to　be　consistent　with　the　theoretical　predictions.　Skewing　of　the　roller　in　the　bearing　is　observed.　A　combined　trigger　signal　is　proposed　to　reduce　the　influence　of　the　cyclical　vibration　of　the　rotor.