A method, used in connection with a pulse-echo type sensor for determining the speed of sound in a gas, for improving the accuracy of speed of sound measurements. The sensor operates on the principle that speed of sound can be derived from the difference between the two-way travel time of signals reflected...http://www.google.com.au/patents/US20050028579?utm_source=gb-gplus-sharePatent US20050028579 - PROCESSING DATA, FOR IMPROVED ACCURACY, FROM DEVICE FOR MEASURING SPEED OF SOUND IN A GAS
