公开(公告)号：DE2505776A1

公开(公告)日：1975-08-14

申请号：DE2505776

申请日：1975-02-12

Applicant: COULTER ELECTRONICS

Inventor： HOGG WALTER ROBERT ,  COULTER WALLACE HENRY

IPC: H03K5/14 ,  G01R29/02 ,  G01N15/00

Abstract: An apparatus which includes circuitry for automatically sampling each pulse in a series of pulses a predetermined average number of times, sequentially storing the samples for a period of time, and reproducing the pulses from the samples, delayed in time.

公开(公告)号：DE2339213A1

公开(公告)日：1974-02-21

申请号：DE2339213

申请日：1973-08-02

Applicant: COULTER ELECTRONICS

Inventor： HOGG WALTER ROBERT

IPC: G01N33/48 ,  G01N1/00 ,  G01N15/12 ,  G01N15/02

Abstract: A fluid ejecting mechanism for use in a study device wherein a non-diluted specific minute amount of fluid sample containing particles is ejected by the ejecting mechanism into a flow stream leading to a sensing zone in the particle counter. The ejecting mechanism includes a hollow body having a thermal expansion device mounted therein and a power supply circuit which supplies a predetermined amount of electrical energy to the thermal expansion device to raise the temperature of same a predetermined amount and cause the same to expand thereby to eject from the hollow body a specific amount of fluid sample having a volume displacement equal to the volume increase of the thermal expansion device. Preferably the hollow body is part of a syringe including a plunger. The syringe facilitates the picking up of fluid sample of which only a minute specific portion is ejected toward the sensing zone of the particle counter.

公开(公告)号：DE2228586A1

公开(公告)日：1973-01-11

申请号：DE2228586

申请日：1972-06-12

Applicant: COULTER ELECTRONICS

Inventor： HOGG WALTER ROBERT

IPC: G01N15/12 ,  G01N15/02

公开(公告)号：GB1254891A

公开(公告)日：1971-11-24

申请号：GB207869

申请日：1969-01-14

Applicant: COULTER ELECTRONICS

Inventor： HOGG WALTER ROBERT ,  KLEIN ROBERT IVAN ,  HAYES CARL BURGESS

IPC: G01N15/12 ,  G01N33/49

Abstract: 1,254,891. Counting particles. COULTER ELECTRONICS Ltd. 14 Jan., 1969 [15 Jan. 1968], No. 2078/69. Heading G4D. [Also in Division G1N] Analysis of particle.bearing liquid, e.g. by Coulter apparatus, is improved by passing the liquid through parallel channels A, B, C and accumulating pulse counts separately, comparing the counts. so as to discard any count which differs markedly from the others, and averaging the counts which are not discarded. Pulse count accumulators 24, 26, 28 apply potentials increasing with count to comparator amplifiers 80, 90, 100 where each channel is compared with another to give a differential output to threshold devices 84, 94, 104. At the same time the outputs of each pair are added and computed to an allowable standard deviation in parabolic networks 124, 136, 148 which control the threshold devices. Assuming a trouble-free operation the line 64, Fig. 2, shows how voltage increases with time between allowable voltages 208, 210. If, however, one channel is blocked so that its voltage follows the line 66 then the average count voltage follows the line 214. When this voltage crosses the lower limit line 210 then the related threshold device operates. A voting logic network 88 comprises three AND gates, one of which then opens to open the switch 42, 44 or 46 corresponding to the blocked channel so that the averaging network 54 discards the unwanted count. In a modification (Fig. 6, not shown) the allowable deviation is computed from all the channels the counts in which are compared individually with the accumulated average. The threshold devices are therefore individual to the channels. A matrix (231) permits one defective channel to be discarded but if a second channel becomes defective the test is voided.

公开(公告)号：GB1249470A

公开(公告)日：1971-10-13

申请号：GB5164468

申请日：1968-10-31

Applicant: COULTER ELECTRONICS

Inventor： COULTER WALLACE HENRY ,  HOGG WALTER ROBERT

IPC: G01D1/14 ,  G01N15/12 ,  G06M11/00

Abstract: 1,249,470. Measuring particle size. COULTER ELECTRONICS Ltd. 31 Oct., 1968 [1 Nov., 1967], No. 51644/68. Heading G4H. [Also in Division G1] In apparatus for ascertaining that particle size of a particulate system above and below which predetermined fractions of the total mass of the system lie (e.g. the mass median, for equal fractions), a particle scanning transducer 330 working on the Coulter principle generates discrete pulses each of amplitude proportional to the volume of the particle giving rise thereto. The pulses are converted into binary cooled particle size signals which are added or subtracted to a total in a register 304 according as the output from a comparator 334 shows that the particle size signal is greater than or less than a feedback threshold signal T. A multiplier 302 allows different mass percentiles to be selected. At equilibrium, the output of the register 304 represents the required particle volume. A computing circuit 311 calculates the equivalent spherical diameter which is converted to decimal code at 310 and fed to a tape or card printer 370.