Radiosonde Circuitry for Impedance Measurement of an A1203 Absolute Water Vapor Sensor.
Abstract
The patent application relates to an improved circuit which permits measurement of the impedance of an Al2O3 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 the above dew point range, and is stable within plus or minus 1% over a -60C to +20C 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 24, 1974
- Accession Number
- ADD001244
Entities
People
- Paul Kranz
Organizations
- United States Department of the Navy