公开(公告)号：GB716731A

公开(公告)日：1954-10-13

申请号：GB141552

申请日：1952-01-17

Applicant: MINI OF SUPPLY

Inventor： ALDER NORMAN LLEWELLYN

IPC: G10K1/34 ,  H01J21/08

Abstract: 716,731. Thermionic-cathode tubes. MINISTER OF SUPPLY. Jan. 15, 1953 [Jan. 17, 1952], No. 1415/52. Class 39(1) [Also in Group XXXVIII] A transducer producing electrical variations corresponding to variations in external pressure comprises a thermionic diode valve whose cathode is fixed, and whose anode is attached to a flexible membrane, whereby variations in pressure alter the distance between the electrodes to vary the impedance of the valve, which may be measured by means of a phantastron circuit. Construction. A glass valve envelope 1 (Fig. 1) closed by a flexible copper, aneroid diaphragm 2, contains a heater 10 and cathode 9, surrounded by a ring member 12 which prevents the diaphragm from touching the cathode. The diaphragm 2 is biased upwardly by a spring strip 15, located by a threaded stem 16 attached at the centre of the diaphragm and held in tension by a nut and collar 19, the diaphragm being normally a short distance from ring 12. Reduction of the external atmospheric pressure causes the diaphragm 2 to move away from the cathode 9, thereby changing the impedance of the valve. Measuring atmospheric pressure. The transducer 21 (Fig. 4) forms part of a potentiometer 22 controlling the anode voltage of a pentode valve 25 arranged as a phantastron, so that a pulse applied at the SYNCH terminal 26 initiates a phantastron cycle, producing an output pulse at terminal 27 whose length is proportional to the anode voltage, and may be measured. The apparatus may be attached to a radiosonde balloon.

公开(公告)号：GB647926A

公开(公告)日：1950-12-28

申请号：GB1390848

申请日：1948-05-22

Applicant: MINI OF SUPPLY

Inventor： JONES FRANCIS EDGAR ,  STRATH JOHN ALEXANDER WISEMAN ,  ALDER NORMAN LLEWELLYN

IPC: G01S13/76

Abstract: 647,926. Electric indicating systems. MINISTER OF SUPPLY. May 22, 1948, No. 13908. [Class 40 (i)] [Also in Group XL (c)] In a radar telemetry system a mobile remote transponder is triggered by a train of interrogating RF pulses from a ground radar station, to emit a train of secondary pulses by which its position may be tracked from the ground station. Selected groups of secondary pulses are cylically characteristically modulated to mark the beginning and end of a time interval representative of the reading of a measuring instrument at the remote station and such modulated pulses are separated at the ground station to produce indications of the remote reading on recording apparatus, which is synchronized with the modulating apparatus by other selected groups of modulated pulses. The readings of a plurality of instruments may be sequentially transmitted. A radiosonde assembly is attached to a free balloon and comprises (Fig. 2) a radio receiver and aerial 5, 6, a transmitter and aerial 10, 11, and a modulator 8, constituting a transponder triggered by a known ground radar station which tracks the radiosonde to give wind velocity and direction data. A telemetering unit 9 comprises a barometer 27 (Fig. 3), a thermometer 28, and a hygrometer 29 which axially traverse the contact arms 24, 25, 26 along a drum 21 which carries a helical metal rib 22, engaging the moving contacts and the fixed contact 23. The drum is rotated by an electric or clockwork motor 20 driving the synchronizing contacts 15 which at 1/30 second intervals connect the condenser 17 in the modulator circuit to slightly widen a group of secondary pulses. At 15 second intervals the ribbed drum sequentially engages contacts 23, 24, 25, 26, momentarily closing contacts 16 to connect condenser 18, which considerably widens a further group of secondary pulses. The drum may alternatively mechanically operate detached pairs of contacts. At the ground station the signals are separated by known circuits into the ordinary train of narrow pulses which is tracked, a group of slightly wider pulses every 1/30 second which synchronizes a recorder drum with the telemetering drum, and four successive groups of considerably wider pulses every 15 seconds, which define three time intervals representing respectively the barometer, thermometer and hygrometer readings at the radiosonde. The time intervals are converted by known apparatus into deflections of styli recording the remote readings on the drum. The electrical elements of the radiosonde may be thermally insulated and communicate through ports with the external meterological instruments. In a modification, data is transmissible from the radiosonde by varying the timing between the receipt of a triggering pulse and the emission of a secondary pulse. A ranging pulse may be emitted immediately followed by a signal pulse after a variable time interval dependent on instrument readings. The Provisional Specification refers to a free-running radiosonde transmitter emitting data modulated pulse groups, which cannot be tracked by ground radar, to give wind velocity and direction.