Boots – shoes – and leggings
Patent
1980-12-22
1983-03-22
Chin, Gary
Boots, shoes, and leggings
364558, 73 1R, G01L 2500
Patent
active
043778518
ABSTRACT:
The specification teaches a method for calibrating a transducer for converting pressure variation to a frequency variation of a periodic electrical signal. The transducer includes a reference signal source and a sensor signal source which are combined in a mixer. The method includes the steps of applying a first reference pressure to the transducer and measuring the first sensor signal frequency and applying a second reference pressure to the transducer and measuring a second sensor frequency. The reference signal frequency is measured during at least one of the applications of the first or second reference pressure. An actual, uncalibrated transfer function is calculated defining the mixer output signal frequency as a function of pressure. The slope of the actual transfer function is altered to a desired, calibrated slope by changing the magnitude of a resistor in the sensor signal source. The frequency axis intercept is altered to a desired, calibrated frequency intercept by changing the magnitude of a resistor in the reference signal source. The method permits calibration of the transducer to a desired transfer function thereby making possible identical transfer functions for a plurality of mass produced units.
REFERENCES:
patent: 3790910 (1974-02-01), McCormack
patent: 3886473 (1975-05-01), Heyck
patent: 4089058 (1978-05-01), Murdock
patent: 4192005 (1980-03-01), Kurtz
patent: 4198677 (1980-04-01), Brunner et al.
Abolins Peter
Chin Gary
Ford Motor Company
Sadler Clifford L.
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