Radiosonde circuitry for impedance measurement of an Al.sub.2 O.

Details Radiosonde circuitry for impedance measurement of an Al.sub.2 O. Radiosonde circuitry for impedance measurement of an Al.sub.2 O.

1974-12-24

1978-02-14

Caldwell, Sr., John W.

Communications: electrical

Digital comparator systems

324 65R, 325113, 325115, 330294, 340177VC, 340203, 340207R, G08C 1916, G08C 1700

Patent

active

040742415

ABSTRACT:
An improved circuit permits measurement of the impedance of an Al.sub.2 Ob.3 water vapor sensor used with conventional radiosonde telemetry systems.
The circuit includes an oscillator, an output pulse shaper and a voltage regulator. The oscillator section is a temperature stabilized feedback oscillator which uses the sensor as a feedback element. The oscillator output is a square wave varying from 20 to 200 Hz over a dew point range, of 110.degree. to 0.degree. C. and is stable within .+-. 1% over a -60.degree. to +20.degree. C. temperature range. The output pulse shaper converts the square wave from the oscillator to a 60 microsecond wide, 3 volt negative-going pulse suitable for modulating the radiosonde transmitter. The voltage regulator provides regulated +4.5 volts from the sonde battery for operating the oscillator and pulse shaper.

REFERENCES:
patent: 3059177 (1962-10-01), Winchel
patent: 3204195 (1965-08-01), Maestre
patent: 3253588 (1966-05-01), Vuilleumier et al.
patent: 3267386 (1966-08-01), Davis et al.
patent: 3375716 (1968-04-01), Hersch
patent: 3392348 (1968-07-01), Horwitz
patent: 3573776 (1971-04-01), Dick
patent: 3579094 (1971-05-01), Jorgensen
patent: 3609728 (1971-09-01), Quinn
patent: 3689907 (1972-09-01), Guajardo

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