发明名称 |
Electromagnetic flowmeter system |
摘要 |
An electromagnetic flowmeter system whose electromagnets are excited by a direct-current source through switching means operating at a predetermined drive frequency to generate a pulsatory current establishing a magnetic flux field in the flow tube through which the fluid to be measured is conducted. The fluid intercepting this field induces a pulsatory voltage in the metering electrodes mounted at diametrically-opposed positions on the tube. The electrode voltage is applied to an analyzer which includes a sampling switch operating in synchronism with the drive frequency to extract pulses from the electrode voltage during the magnetic flux steady state intervals thereof. These pulses, which are rich in harmonics, are fed through a filter that selects one of the harmonics to yield a harmonic signal which is demodulated to produce an output signal free of disturbances.
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申请公布号 |
US4290313(A) |
申请公布日期 |
1981.09.22 |
申请号 |
US19800112344 |
申请日期 |
1980.01.15 |
申请人 |
FISCHER & PORTER COMPANY |
发明人 |
APPEL, EGGERT;NISSEN, PETER;GEISLER, GOTTFRIED;KIENE, WILFRIED |
分类号 |
G01F1/60;(IPC1-7):G01F1/60 |
主分类号 |
G01F1/60 |
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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