| A thermal insulation method for a piezoelectric transducer |
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| 作者姓名： | WU Song CHEN Hong GU JiaHua YU HongRut |
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| 作者单位： | Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （Grant No. 90605006） |
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| 摘 要： | 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.
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| 关 键 词： | 压电式换能器 绝热方法 瞬时压力测量 信号失真 |
| 收稿时间： | 12 February 2007 |
| 修稿时间： | 2007-02-12 |
A thermal insulation method for a piezoelectric transducer |
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| WU Song CHEN Hong GU JiaHua YU HongRut.A thermal insulation method for a piezoelectric transducer[J].Chinese Science Bulletin,2007,52(17):2305-2309. |
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| Authors: | Wu Song Chen Hong Gu JiaHua Yu HongRu |
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| Institution: | (1) Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100080, China |
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| Abstract: | 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. |
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| Keywords: | instantaneous pressure measurement piezoelectric transducer thermal insulation |
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