Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1982-01-28
1984-05-15
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
G01T 118
Patent
active
044490496
ABSTRACT:
This invention is a novel portable charger for dosimeters of the electrometer type. The charger does not require batteries or piezoelectric crystals and is of rugged construction. In a preferred embodiment, the charge includes a housing which carries means for mounting a dosimeter to be charged. The housing also includes contact means for impressing a charging voltage across the mounted dosimeter. Also, the housing carries a trigger for operating a charging system mounted in the housing. The charging system includes a magnetic loop including a permanent magnet for establishing a magnetic field through the loop. A segment of the loop is coupled to the trigger for movement thereby to positions opening and closing the loop. A coil inductively coupled with the loop generates coil-generated voltage pulses when the trigger is operated to open and close the loop. The charging system includes an electrical circuit for impressing voltage pulses from the coil across a capacitor for integrating the pulses and applying the resulting integrated voltage across the above-mentioned contact means for charging the dosimeter.
REFERENCES:
patent: 2761073 (1956-08-01), Carlbom et al.
patent: 2871365 (1959-01-01), Cahen et al.
patent: 2884533 (1959-04-01), Richard-Foy
patent: 3193749 (1965-07-01), Grimm et al.
patent: 4247775 (1981-01-01), Kronenberg
Repair & Maintenance Manual of Civil Defense Radiological Instruments, vol. 4, "Dosimeters & Chargers", Office of Civil Defense, Washington, D.C., pp. 19.1-19.11 and pp. 23.16 and 23.17.
"Health Physics Instrument Manual", Oak Ridge National Laboratory, ORNL Report 332, (Aug. 1978) pp. 42-43.
Esposito Michael F.
Hamel Stephen D.
Howell Janice A.
Lewis Fred O.
The United States of America as represented by the United States
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