US5023450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for discriminating microphonic noise in proportional counters
Assignee: Halliburton Logging Services Inc
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Filing: 1990-04-12
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Granted: 1991-06-11
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Expires: 2010-04-12
Abstract
Abstract This disclosure is directed to a detector system for use in measuring while drilling (MWD) equipment. It comprises preferably duplicate chambers positioned to one another and mounted in a MWD system where they are subject to the same shock and vibration. The shock and vibration impinge on the two chambers, and cause two output signals to be formed. The two output signals are applied to a differential amplifier so that the microphonic portion of the signal is cancelled. This then leads to a differential output signal which carries in it the signals representing nuclear events detected by the similar or duplicate detector means. Alternately, a single chamber can be used if it is provided with two anode wires and they are connected to the differential amplifier for signal cancellation.
Inventors
- 👤 Randy Gold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:41
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; E; E21; E21B; E21B47/00; E21B47/01
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
209 words
A detector system responsive to nuclear events for installation in a downhole logging tool including measuring well drilling equipment which subjects the detection system to microphonic shock, the detector system which comprising: (a) a closed chamber subject to impinging nuclear events and having two separate anode wires therein spaced apart from each other and spanning said chamber, providing a pair of separated spaced output terminals to thereby form an output signal; (b) circuit means connecting from at least one of said chamber output terminals to a different amplifier means having two input terminals; (c) said circuit means connected from said output terminal of said chamber to one of the input terminals of said differential amplifier means to cause formation of an output signal from said differential amplifier means; and (d) vibration shock responsive means mounted in said detector system and having an output terminal which forms an output signal for connection to a second input at said differential circuit means so that microphonic signals from said chamber and said shock responsive means are provided thereto and tend to cancel when applied to the input terminals thereof, and wherein said shock responsive means does not cancel at said differential circuit means signals relating to nuclear events from said detector system.
Claim 2
Dependent Claim
209 words
A detector system responsive to nuclear events for installation in a downhole logging tool including measuring well drilling equipment which subjects the detection system to microphonic shock, the detector system which comprising: (a) a closed chamber subject to impinging nuclear events and having two separate anode wires therein spaced apart from each other and spanning said chamber, providing a pair of separated spaced output terminals to thereby form an output signal; (b) circuit means connecting from at least one of said chamber output terminals to a different amplifier means having two input terminals; (c) said circuit means connected from said output terminal of said chamber to one of the input terminals of said differential amplifier means to cause formation of an output signal from said differential amplifier means; and (d) vibration shock responsive means mounted in said detector system and having an output terminal which forms an output signal for connection to a second input at said differential circuit means so that microphonic signals from said chamber and said shock responsive means are provided thereto and tend to cancel when applied to the input terminals thereof, and wherein said shock responsive means does not cancel at said differential circuit means signals relating to nuclear events from said detector system.
Claim 3
Dependent Claim
29 words
The apparatus of claim 1 wherein said detector system includes a second chamber which is similar to said chamber and said closed second chamber also forms an output signal.
Claim 4
Dependent Claim
35 words
The apparatus of claim 2 wherein said detector system comprises a similar separately mounted chamber, and said two chambers are gas filled and have output terminals for formation of output signals resultant from nuclear events.
Claim 5
Dependent Claim
16 words
The structure of claim 3 wherein each of the two chambers is provided with identical gases.
Claim 6
Dependent Claim
13 words
The apparatus of claim 3 wherein said chambers are provided with different gases.
Claim 7
Dependent Claim
24 words
The apparatus of claim 3 wherein said chambers are mounted adjacent one another in a drill collar at a recess within the sidewall thereof.
Claim 8
Dependent Claim
53 words
The apparatus of claim 1 wherein said chamber is provided with a pair of spaced parallel anode wires, and said anode wires are joined by connective means extending therebetween wherein said connective means assures that shock or vibration imparted to one of said wires is also imparted to the other of said wires.
Claim 9
Dependent Claim
17 words
The apparatus of claim 7 wherein said vibration shock responsive means comprises one of said anode wires.
Claim 10
Dependent Claim
20 words
The apparatus of claim 8 wherein said anode wires are connected to a voltage source providing an operating voltage thereto.
Claim 11
Dependent Claim
21 words
The apparatus of claim 9 wherein said circuit means comprises first and second DC blocking capacitors connected to said anode wires.
Claim 12
Dependent Claim
33 words
The apparatus of claim 10 wherein said circuit means connects to two input terminals of said differential amplifier means to formation of differential output relating to nuclear events detected by the detector system.
Claim 13
Dependent Claim
25 words
The apparatus of claim 1 including a pair of similar chambers having similar size and shape and wherein said chambers are filled with 3 He.
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) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |