Patent US2362152A successfully refreshed from Google Patents.
Patent US4020349A successfully refreshed from Google Patents.
US4020349A
Expired / Lapsed
US
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Apparatus for reading and recharging condenser ionization chambers
Assignee: Individual
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Filing: 1975-10-28
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Granted: 1977-04-26
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Expires: 1995-10-28
Abstract
Abstract A metering circuit for a condenser ionization chamber is disclosed for simultaneously recharging the ionization chamber and reading out the amount of charge required to recharge the chamber. During the recharging process, the amount of charge necessary to recharge the ionization chamber capacitor is placed on an integrating capacitor in the metering apparatus. The resultant voltage across the integrating capacitor is a measure of the radiation to which the ionization chamber was exposed.
Inventors
- 👤 Richard C. McCall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:32
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/14; G01T1/142
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
An apparatus for recharging a condenser ionization chamber and simultaneously measuring the amount of charge required to recharge it, comprising: input means for connection to a condenser ionization chamber; a source of potential coupled to the input means; an integrator circuit having an input connected to the source of potential and having an output; and measuring means coupled to the output of the integrator circuit for measuring the amount of charge stored in the integrator circuit.
Claim 2
Independent Claim
76 words
An apparatus for recharging a condenser ionization chamber and simultaneously measuring the amount of charge required to recharge it, comprising: input means for connection to a condenser ionization chamber; a source of potential coupled to the input means; an integrator circuit having an input connected to the source of potential and having an output; and measuring means coupled to the output of the integrator circuit for measuring the amount of charge stored in the integrator circuit.
Claim 3
Dependent Claim
31 words
An apparatus as in claim 1 wherein the integrator circuit comprises an amplifier having an input and an output and a capacitive feedback circuit connected between the amplifier input and output.
Claim 4
Dependent Claim
57 words
An apparatus as in claim 2 wherein the amplifier is a differential amplifier having an inverting and a noninverting input, the noninverting amplifier input being coupled to the input means, the inverting amplifier input being coupled to the capacitive feedback circuit, and the source of potential being coupled between the input means and the inverting amplifier input.
Claim 5
Dependent Claim
63 words
An apparatus as in claim 3, wherein the input means comprises: first and second connector terminals for making connection with the condenser ionization chamber, the first connector terminal being coupled to the source of potential and the second connector terminal being coupled to the noninverting amplifier input; and a network coupled to the amplifier inputs for controlling the charging rate of the apparatus.
Claim 6
Dependent Claim
50 words
An apparatus as in claim 4 wherein the network comprises: a first resistor connected to the source of potential; a second resistor connected between the first resistor and the inverting amplifier input; and a capacitor connected between the junction of the first and second resistors and the noninverting amplifier input.
Claim 7
Dependent Claim
32 words
An apparatus as in claim 5 wherein the measuring means comprises a third resistor connected between the amplifier output and the noninverting amplifier input and a voltmeter connected across the third resistor.
Claim 8
Dependent Claim
29 words
An apparatus as in claim 6 wherein the capacitive feedback circuit includes a feedback capacitor and a reset switch connected across the feedback capacitor for selectively shorting the capacitor.
Claim 9
Dependent Claim
13 words
An apparatus as in claim 7 wherein the voltmeter is a digital voltmeter.
Claim 10
Dependent Claim
46 words
An apparatus as in claim 7 wherein the capacitive feedback means further includes an additional feedback capacitor and a range switch connected to the feedback capacitor and the additional feedback capacitor for connecting one of these capacitors between the amplifier output and the inverting amplifier input.
References Cited (Backward Citations)
US2871365A
Cited
US2884533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |