GB1248169A - Particle analysis pulse collating apparatus - Google Patents
Particle analysis pulse collating apparatusInfo
- Publication number
- GB1248169A GB1248169A GB03468/69A GB1346869A GB1248169A GB 1248169 A GB1248169 A GB 1248169A GB 03468/69 A GB03468/69 A GB 03468/69A GB 1346869 A GB1346869 A GB 1346869A GB 1248169 A GB1248169 A GB 1248169A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- particle
- companion
- counted
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002245 particle Substances 0.000 title abstract 10
- 238000011144 upstream manufacturing Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/26—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being duration, interval, position, frequency, or sequence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/12—Coulter-counters
-
- G01N15/132—
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
1, 248, 169. Particle analyzing apparatus. COULTER ELECTRONICS Ltd. March 14, 1969 [March 18, 1968], No. 13468/69. Heading G1N. In particle analyzing apparatus working on the Coulter principle, two different current sources 9, 10 are employed giving rise to two "companion" pulses per particle which are compared with each other and counted if one exceeds the other by a predetermined factor. One source may be D. C. or low frequency, the corresponding pulses having amplitudes proportional to the volumes of the particles, and the other source may be r.f., the corresponding pulses having amplitudes related to some physical character of the particles, the comparison being arranged so that all the particles of one type are counted while those of a different type are not. In Fig. 1, the two companion pulses from each particle are produced simultaneously, detected in separate channels of a detector 11, and fed to a collator 20. Alternatively Fig. 2 (not shown) the companion pulses may be produced one after the other as a particle passes through a constricted passage having respective electrode pairs arranged on mutually perpendicular, spaced, axes, a delay (18) being included in the channel for the upstream electrode pair. Collators. If the detected pulses are of opposite polarity, a simple weighted summing circuit Figs. 5 and 6 (not shown) may be used, a particle being counted if the summed signals are of a given polarity. In Fig. 7, pulses from one channel A are clipped to reduce noise interference and applied to threshold circuits 40, 140 via variable attenuators 36, 136. Logic circuit 102 produces an output pulse to be counted only when the amplitude of a pulse in channel B lies within a range determined by the amplitude of the companion pulse in channel A and the setting of attenuators 36, 136. The collator may use pulse-stretching instead of clipping Figs. 9 and 10, (not shown). Reference has been directed by the Comptroller to Specification 1, 185, 898.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US71396868A | 1968-03-18 | 1968-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1248169A true GB1248169A (en) | 1971-09-29 |
Family
ID=24868284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB03468/69A Expired GB1248169A (en) | 1968-03-18 | 1969-03-14 | Particle analysis pulse collating apparatus |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1913418C3 (en) |
| FR (1) | FR2004122A1 (en) |
| GB (1) | GB1248169A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61124850A (en) * | 1984-11-21 | 1986-06-12 | Eruma Kogaku Kk | Apparatus for measuring impurities in ultra-pure water |
-
1969
- 1969-03-14 GB GB03468/69A patent/GB1248169A/en not_active Expired
- 1969-03-17 FR FR6907497A patent/FR2004122A1/fr active Pending
- 1969-03-17 DE DE1913418A patent/DE1913418C3/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1913418B2 (en) | 1979-05-23 |
| FR2004122A1 (en) | 1969-11-21 |
| DE1913418A1 (en) | 1969-10-09 |
| DE1913418C3 (en) | 1980-01-31 |
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