发明名称 |
Phase difference measuring apparatus for measuring phase difference between input signals |
摘要 |
A phase difference measuring apparatus for precisely measuring a phase difference between two input signals having the same frequency sent from, for example, a Coriolis type mass flowmeter. A differential amplifier in the apparatus provides the sum or difference of the two input signals and a multiplexor sequentially selects and outputs to an A/D converter the two input signals and the output of the differential amplifier. The A/D converter converts the output of the multiplexor into digital data and a digital signal processor or a microcomputer calculates the phase difference between the two input signals based on the converted digital data. The apparatus may further comprise a function that an error caused by the difference of the transfer characteristics of a filter and the A/D converter is compensated using a reference signal which is selected from the two input signals.
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申请公布号 |
US5844408(A) |
申请公布日期 |
1998.12.01 |
申请号 |
US19970806161 |
申请日期 |
1997.02.25 |
申请人 |
FUJI ELECTRIC CO., LTD. |
发明人 |
YOSHIMURA, HIROYUKI;MORITA, AKIRA |
分类号 |
G01F1/86;G01F1/84;G01R25/00;G01R25/04;(IPC1-7):G01R25/00 |
主分类号 |
G01F1/86 |
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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