发明名称 |
Piezoelectric pressure sensor |
摘要 |
A piezoelectric pressure sensor for detecting the amount of oil in an engine oil pan of an automobile, and liquid level or the amount of liquid such as water level in a water bath, makes use of the phenomenon that an impedance of an excited piezoelectric element varies between in a gas and in a liquid. The pressure sensor is insensitive to surrounding temperature, and has high response and is of simple construction.
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申请公布号 |
US4019072(A) |
申请公布日期 |
1977.04.19 |
申请号 |
US19750558627 |
申请日期 |
1975.03.17 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
MIFUNE, HIDEO;TANI, KENROKU;NIIKAWA, TOMOHIKO |
分类号 |
G01F23/22;G01F23/18;G01L9/08;(IPC1-7):H01L41/04 |
主分类号 |
G01F23/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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