There is described a method and apparatus for measuring temperature of a fluid in a microchannel of the type having spaced walls. An ultrasonic transducer transmits ultrasonic waves transmitted from one wall to the opposite wall. A processor determines the time-of-flight of the ultrasonic waves from...http://www.google.com/patents/US6789426?utm_source=gb-gplus-sharePatent US6789426 - Microfluidic channels with integrated ultrasonic transducers for temperature measurement and method
