Level detection system having a band-pass characteristic and a s

Details Level detection system having a band-pass characteristic and a s Level detection system having a band-pass characteristic and a s

1974-05-06

1977-04-05

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

Unwanted harmonic or voltage component elimination...

318606, 318684, 307233R, G05B 1101

Patent

active

040164713

ABSTRACT:
A level detection system and a servo system employing the level detection system are disclosed. The level detection and servo system employs the use of a reasonably broad band-pass characteristic to avoid criticality in narrow band-pass systems. The level detection system includes an input level comparison circuit responsive to an input signal having a recurrent frequency and a reference signal. A filter having a band-pass characteristic which will pass the recurrent frequency of the input signal and its side-bands is responsive to the input level comparison circuit. The output of the filter is coupled to a second comparison circuit. The second comparison circuit is employed as a control means to drive the servo motor in the servo system.

REFERENCES:
patent: 3562675 (1971-02-01), Urell
patent: 3577008 (1971-05-01), Craft
patent: 3582679 (1971-06-01), Carp
patent: 3679957 (1972-07-01), Farque
patent: 3777125 (1973-12-01), Whetham
patent: 3808486 (1974-04-01), Cuda et al.

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