Communications: electrical – Selective – Having indication or alarm
Patent
1976-09-27
1978-09-05
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
250231SE, 340190, 340201P, G08B 536
Patent
active
041124138
ABSTRACT:
A rate of change in altitude computer for providing a pilot with information to safely operate an aircraft. A beam of light is communicated through a mask. A gear responsive to altitude rotates the mask. A photocell receives the beam of light as it passes through the mask to produce sinusoidal wave signals. The positive node of the sinusoidal wave signal is modified to activate a transistor which allows a capacitor to be charged for a time period equal to the positive node. During the negative node of the sinusoidal wave signal the capacitor discharges. When the voltage associated with the charging and discharging of the capacitor is averaged, a steady state voltage is produced. The steady state voltage, which is proportional to the rate of rotation of the mask, drives a dial of an indicator to provide an operator with visual information relating to instantaneous rate of changes in altitude.
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patent: 3206975 (1965-09-01), Elwell et al.
patent: 3491244 (1970-01-01), Stewart
patent: 3815420 (1974-06-01), Springer
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patent: 3916185 (1975-10-01), Jehly
patent: 4006472 (1977-02-01), Greene
Zuch, "Voltage to Frequency Converters", Electronics, May 15, 1975, pp. 91-95.
Hart Russell Frank
Muhs Donald Paul
Caldwell Sr. John W.
Decker Ken C.
Groody James J.
McCormick Jr. Leo H.
The Bendix Corporation
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