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Switching circuit for radiosonde
| Details |
Inventors: Dickson, Vernon E.; Lee, James G. C.; Saini, Gurbachan S.;
Assignee: Sangamo Company Limited (CA)
Primary Examiner: Griffin; Robert L.
Assistant Examiner: Ng; Jin F.
Attorney, Agent or Firm: Sherman; W. R., McMahon; Kevin
A radiosonde comprising a transmitter, a modulating oscillator, a control circuit for the oscillator and sensing elements to be switched into and out of said control circuit, characterized in that a solid state switching circuit is utilized for switching the sensing elements into and out of said control circuit to produce atmospheric information signals and with the sensing elements out of the control circuit there is produced a reference signal which reflects essentially the same impedance from the solid state switching circuit as is reflected in the atmospheric information signals thereby providing for evaluation of the information signals. |
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DETAILED DESCRIPTION OF THE DRAWINGS With reference to the drawings, the radiosonde is shown as comprising a radio frequency transmitter 10 feeding an antenna 12 being modulated by a "meteorological data" oscillator and modulator 14 and powered by a battery 16.
The control circuit for controlling the modulator oscillator 14 for providing the temperature versus barometric pressure, humidity versus barometric pressure, the low reference, and high reference signals, includes a fixed resistance made up of R.
sub.
1 and R.
sub.
2, field effect transistor No.
1 (FET 1), field effect transistor No.
2 (FET 2), Thermistor 18, Hygristor 20.
Monostable switch 22, multiple segment commutator switch section 24 and aneroid capsule 26.
In the particular embodiment of the invention illustrated, the physical movement of the wall of the aneroid capsule 26 is mechanically amplified to operate a contact 28 over the multiple segment commutator type switch section 24.
The multiple conducting elements or contacts 30, 32, 34 of this single pole commutator type switch are connected in 3 predetermined parallel groups.
The conducting elements 30 are connected into the low reference circuitry of the modulating oscillator 14 while the conducting elements 32 and 34 are connected into the high reference and humidity circuitry respectively of the modulating oscillator.
The radiosonde aneroid capsule 26 is calibrated in association with its commutator switch 24 prior to flight in a vacuum chamber, and its calibration is recorded on a paper tape.
The tape is a record of pressure against each conducting element or contact of the commutator switch.
As hereinafter more fully explained, the radiosonde in flight transmits one of four information signals depending upon the barometric pressure of its environment which determines the element of the commutator switch that is conducting.
The most important information is temperature versus barometric pessure which is transmitted whenever contact 28 rests on a non-conducting segment 36 of the commutator switch
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Telecommunications 
