Measuring and testing – Human stress limit
Patent
1990-10-16
1992-04-14
Noland, Tom
Measuring and testing
Human stress limit
738663, G01F 2318, G01L 906, G01D 700
Patent
active
051036851
ABSTRACT:
A wrist-worn, real-time-indicating, actual rate of ascent/decent meter includes a non-corrodable, hermetic enclosure with a window. A display, visible through the window, includes numeric rate-related indicia and arrows, both clearly visible against a contrasting backdrop. The contrast may be black on silver. A hysterisis-free transducer in the enclosure produces first signals proportional to the ambient pressure. The first signals are converted to second signals representing depth in the ambient, the latter signals being periodically sampled. Each sample is compared to the previous sample and third rate-of-change-of-depth-with-time signals result from successive comparisons. The third signals are displayed numerically and direction (ascending or descending) is indicated by the arrows. Signal processing is controlled and performed by a microprocessor within the enclosure. Facilities are provided to replace a battery and to turn the meter on and off without affecting the hermeticity of the enclosure.
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Kaufmann John D.
Noland Tom
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