US3760281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial trajectory sensor having gating means controlled by pulse duration measuring for electronic particle study apparatus
Assignee: Coulter Electronics Inc
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Filing: 1972-09-21
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Granted: 1973-09-18
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Expires: 1992-09-21
Abstract
Abstract An axial trajectory sensor for use with an electronic particle study apparatus, for differentiating between particles passing on or nearly on axial paths through the detecting zone of the apparatus and particles passing displaced from such an axial path. The sensor derives a duration-measuring pulse for each particle, with such duration being that of the particle generated pulse at a fractional amplitude of the particle pulse. The sensor establishes a duration criteria, subjects each duration-measuring pulse to that criteria, and responds to each duration-measuring pulse by distinguishing between those longer and shorter than the duration criteria.
Inventors
- 👤 W Hogg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:35
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/1031; G01N15/12; G01N15/131; G01N15/132
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
260 words
An axial trajectory sensor for use with a particle study apparatus in which particles pass through a detecting zone having an axis for producing particle pulses, the particles, when passing closest to an axial trajectory through the detecting zone, producing desirable particle pulses having amplitudes which are most nearly proportional to the respective sizes of the particles, and also thereby having a certain approximate duration, and in which particles passing through the detecting zone on trajectories displaced from its axis will produce other particle pulses having amplitudes which are not necessarily proportional to their respective sizes and having durations which tend to be longer than said certain approximate duration; said sensor being constructed with an input and arranged to respond to said desirable particle pulses in a first manner and to respond to said other particle pulses in a second manner and comprising: A. means for measuring the duration of at least a predetermined portion of a particle pulse applied to the input of said sensor at some predetermined fraction of the amplitude thereof and deriving a duration-measuring pulse having the measured duration; B. means for establishing an electrical standard equivalent to a maximum desired duration for the duration-measuring pulses; C. means for comparing each said duration-measuring pulse with said standard and for providing a first type of energizing signal if said standard is not exceeded and a second type of signal if said standard is exceeded; and D. means cOupled for receiving said first and second types of signals for generating, respectively, the first and second manners of response.
Claim 2
Dependent Claim
260 words
An axial trajectory sensor for use with a particle study apparatus in which particles pass through a detecting zone having an axis for producing particle pulses, the particles, when passing closest to an axial trajectory through the detecting zone, producing desirable particle pulses having amplitudes which are most nearly proportional to the respective sizes of the particles, and also thereby having a certain approximate duration, and in which particles passing through the detecting zone on trajectories displaced from its axis will produce other particle pulses having amplitudes which are not necessarily proportional to their respective sizes and having durations which tend to be longer than said certain approximate duration; said sensor being constructed with an input and arranged to respond to said desirable particle pulses in a first manner and to respond to said other particle pulses in a second manner and comprising: A. means for measuring the duration of at least a predetermined portion of a particle pulse applied to the input of said sensor at some predetermined fraction of the amplitude thereof and deriving a duration-measuring pulse having the measured duration; B. means for establishing an electrical standard equivalent to a maximum desired duration for the duration-measuring pulses; C. means for comparing each said duration-measuring pulse with said standard and for providing a first type of energizing signal if said standard is not exceeded and a second type of signal if said standard is exceeded; and D. means cOupled for receiving said first and second types of signals for generating, respectively, the first and second manners of response.
Claim 3
Dependent Claim
34 words
An axial trajectory sensor according to claim 1 in which said means for measuring duration is operative to measure the duration of the entire particle-produced pulse at said predetermined fraction of the amplitude thereof.
Claim 4
Dependent Claim
100 words
An axial trajectory sensor according to claim 1 in which said measuring means is constructed and arranged to produce an electrical wave having a duration substantially longer than the duration of the particle pulse from which the electrical wave is derived and having a constant amplitude over a substantial portion of its duration, which amplitude is said predetermined fraction of the amplitude of the particle pulse from which it is derived; and said measuring means is constructed for comparing each particle pulse with its said electrical wave during a period of time when the amplitude of said wave is constant.
Claim 5
Dependent Claim
105 words
An axial trajectory sensor according to claim 1 in which said receiving means includes a gate and a switch, with said gate being connected between said standard establishing means and said switch; a strobe pulse generator being connected to said gate to produce a strobing pulse from said duration-measuring pulse to energize said gate and operate said switch to pass any signal or part thereof for the duration only of said strobing pulse; whereby said second type of energizing signal inhibits operation of said gate to prevent action of said strobing pulse on said switch, and said first type of energizing signal enables said gate.
Claim 6
Dependent Claim
91 words
An axial trajectory sensor according to claim 1 which includes electrical converting means which is connected to said measuring means and constructed to convert said duration-measuring pulse into a plurality of clock pulses which can be passed for the duration of the duration-measuring pulse; said electrical standard is defined by a preset number of pulses; and said comparing means is constructed to compare the preset number of pulses with the number of pulses passed for the duration of the duration-measuring pulse for generating said first and second types of energizing signals.
Claim 7
Dependent Claim
84 words
An axial trajectory sensor according to claim 5 in which said standard establishing means comprises a counter and controls for presetting said counter to respond to said preset number of pulses, said counter being constructed for producing said energizing signal of said first type if the number of pulses passed by said duration-measuring pulse does not exceed said preset number and for producing said second type of energizing signal if the number of pulses passed by said duration-measuring pulse does exceed said preset number.
Claim 8
Dependent Claim
66 words
An axial trajectory sensor according to claim 1 which includes electrical converting means which is connected to said measuring means and is constructed to convert said duration-measuring pulse into an electric time-signal pulse having an amplitude; said standard comprises a signal level; and said comparing means is constructed to compare a time-signal pulse against said level to generate said first and second types of energizing signals.
Claim 9
Dependent Claim
34 words
An axial trajectory sensor according to claim 7 in which said converting means comprises an integrator responsive to the duration-measuring pulse, which generates the time-signal pulse as a flat-topped pulse of the ramp-and-pedestal type.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |