Boots – shoes – and leggings
Patent
1979-12-03
1981-12-01
Nusbaum, Mark E.
Boots, shoes, and leggings
364571, 364574, 7386117, G01F 160, G06F 1520
Patent
active
043039804
ABSTRACT:
An electromagnetic flowmeter in which fluid to be metered passes through a flow tube to intersect a magnetic field whereby the voltage induced in the fluid is transferred to a pair of electrodes mounted in the flow tube to yield a flow-induced signal having a random noise component. This field is established by an electromagnet supplied with an excitation current creating a magnetic field that is alternately turned "on" and "off" at a low frequency drive rate. The resultant flow-induced signal is sampled during each "on" and "off" field condition, successive differences therebetween serving to develop an analog output signal having a random noise content. To automatically adjust the output response time of the system as a function of the random noise content and thereby minimize the adverse effects of noise on the system, the analog output signal is fed to a statistical analyzer in which the signal is digitized before being supplied to a microcomputer programmed to determine the statistical significance of the difference between two arithmetic means. To this end, a first series of successive values of the digitized signal is used to establish the first mean and a first variance, and a second series of successive values to establish the second mean and a second variance. The computer, on the basis of the Student "t" statistic, calculates the difference between the two means to produce a digital output signal having the desired response time.
REFERENCES:
patent: 3783687 (1974-01-01), Mannherz et al.
patent: 3833797 (1974-09-01), Grobman et al.
patent: 4157035 (1979-06-01), Doll et al.
patent: 4159645 (1979-07-01), Cushing
patent: 4167871 (1979-09-01), Shauger et al.
patent: 4193298 (1980-03-01), Kayama et al.
Chin Gary
Ebert Michael
Fischer & Porter Company
Nusbaum Mark E.
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