%0 Journal Article %T A thermal insulation method for a piezoelectric transducer %A Song Wu %A Hong Chen %A JiaHua Gu %A HongRu Yu %J Chinese Science Bulletin %@ 1861-9541 %D 2007 %I %R 10.1007/s11434-007-0366-y %X This study deals with the sources of signal distortion of a piezoelectric transducer heated by measured gas flow. These signal distortions originate from both unloading of preload on a piezocrystal because of expansion of a diaphragm in the test apparatus and the pyroelectric effect of a heated piezoelectric crystal. A plastic film on the diaphragm of the transducer can effectively insulate the diaphragm and the piezocrystal within transducer from heating by gas flow, eliminating the sources of distortion. A method for evaluating the thickness of the film is proposed. %K instantaneous pressure measurement %K piezoelectric transducer %K thermal insulation %U http://link.springer.com/article/10.1007/s11434-007-0366-y