Measuring and testing – Vibration – Sensing apparatus
Patent
1982-05-20
1984-10-09
Kreitman, Stephen A.
Measuring and testing
Vibration
Sensing apparatus
73781, G01H 100
Patent
active
044754019
ABSTRACT:
An apparatus to monitor and record, for an industrial environment, two natural frequencies with respect to a "seated spinal system", namely, approximately 10 Hz and approximately 4 Hz, the natural resonant frequencies of the spine. Raw acceleration signals are amplified, conditioned and filtered to allow only 20 Hz or less to pass. The signals are then divided into two respective channels, namely, below 20 Hz and below 8 Hz, following parallel paths through an amplitude detector and through a zero crossover detector, rectifier and digital filter. In each path the amplitude detector controls a storage flip-flop, which enables an associated decade counter when amplitude criteria are met. The digital filter supplies an output, via an AND gate, to the counter if both amplitude and frequency criteria are met. Thus, a count is stored in the counter if both amplitude and frequency criteria are met. Each channel has an LED display which can be turned on, after exposure, to display the number of events recorded.
REFERENCES:
patent: 3393557 (1968-07-01), Brown et al.
patent: 3554012 (1971-01-01), Sohoel
patent: 3580056 (1971-05-01), Warner
patent: 3641550 (1972-02-01), Lynas et al.
patent: 3713127 (1973-01-01), Keledy et al.
patent: 3783679 (1974-01-01), Jackson
patent: 4041783 (1977-08-01), Shimauchi et al.
patent: 4078434 (1978-03-01), Weberhofer
patent: 4167877 (1979-09-01), Avery
Donnermeyer Dennis
Pope Malcolm
Punia David T.
Kreitman Stephen A.
The United States of America as represented by the Department of
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