Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1980-02-21
1982-07-20
Sloyan, Thomas J.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
324 99D, 340347M, 340347NT, G01F 100, H03K 1302
Patent
active
043399584
ABSTRACT:
An analog-to-digital converter for an electromagnetic flowmeter in which the fluid being metered passes through a flow tube to intersect a magnetic field, the voltage induced in the fluid being transferred to a pair of electrodes. The magnetic field is established by an electromagnet supplied with excitation current that is alternately turned "on" and "off" at a low frequency rate. The resultant flow-induced electrode signal is sampled for a predetermined interval in each "on" and "off" field state, successive differences therebetween serving to develop an analog signal representing the flow rate. Conversion is effected by integrating each sample to produce a sloped voltage whose polarity corresponds to that of the sample and whose peak level relative to a base level is determined by the amplitude of the sample, the sloped voltage being then de-integrated back to base level in a time slot whose duration is directly proportional to the average level of the sample. A burst of pulses is extracted from a stable high-frequency oscillator during this time slot, the pulse count of the burst being determined by the duration of the slot, thereby converting each sample to a digital value.
REFERENCES:
patent: 3783687 (1974-01-01), Mannherz et al.
patent: 4041484 (1977-08-01), Boleda et al.
Strong, Product Development Profile-Rough Life of Digital Multimeter Electronics, 23 Jun. 1977, pp. 107-112.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-33, 34; II-48 to II-50.
Ebert Michael
Fischer & Porter Co.
Sloyan Thomas J.
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