US3814937A
Expired / Lapsed
US
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Pulse pile-up rejector with live-time corrector circuit
Assignee: Kevex Corp
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Filing: 1972-04-24
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Granted: 1974-06-04
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Expires: 1992-04-24
Abstract
Abstract A live-time corrector circuit is provided in an x-ray counting device wherein the dead time of the analyzer device as well as dead time caused by overlapping events are compensated for by extending the counting time.
Inventors
- 👤 A Lowes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:43
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/17
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
188 words
In an analyzer for x-ray events wherein the amplitude and number of events are recorded in a multichannel analyzer and said events may occur at a rate faster than the events can be processed by said multichannel analyzer, because said analyzer exhibits dead time during processing, the improvement comprising: a. an input circuit from the pre-amplifier of an x-ray event detector providing a series of pulses, b. means for dividing the pulses from said input circuit into two parallel paths, c. the first of said paths being a fast channel which detects pulses, d. the second of said paths being a slow channel to said multichannel analyzer which processes and gates pulses, e. a live-time clock for determining the live time period during which a series of counts is made, f. means whereby said fast circuit actuates a pulse pile-up rejection circuit having means which stops said live-time clock when two pulses are in such close proximity that they cannot be analyzed by said multichannel analyzer, and g. a second circuit actuated by said multichannel analyzer which shuts off said live-time clock when said multichannel analyzer is busy.
Claim 2
Dependent Claim
188 words
In an analyzer for x-ray events wherein the amplitude and number of events are recorded in a multichannel analyzer and said events may occur at a rate faster than the events can be processed by said multichannel analyzer, because said analyzer exhibits dead time during processing, the improvement comprising: a. an input circuit from the pre-amplifier of an x-ray event detector providing a series of pulses, b. means for dividing the pulses from said input circuit into two parallel paths, c. the first of said paths being a fast channel which detects pulses, d. the second of said paths being a slow channel to said multichannel analyzer which processes and gates pulses, e. a live-time clock for determining the live time period during which a series of counts is made, f. means whereby said fast circuit actuates a pulse pile-up rejection circuit having means which stops said live-time clock when two pulses are in such close proximity that they cannot be analyzed by said multichannel analyzer, and g. a second circuit actuated by said multichannel analyzer which shuts off said live-time clock when said multichannel analyzer is busy.
Claim 3
Dependent Claim
122 words
The analyzer of claim 1 including the following structure: a. a pulse pile-up rejection circuit in said fast channel, said circuit having means for opening a linear gate in said slow channel in the absence of overlapping pulses, b. said fast channel having means for stopping said live-time clock as each pulse is received, c. said slow channel shaping and passing pulses to a multiple channel recorder, d. said slow channel actuating one input of an AND gate when a pulse is processed, e. said multichannel recorder having means to send a not busy signal to the other input of said AND gate when not processing a signal, and f. the output of said AND gate causing said live-time clock to run.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |