Claims
- 1. A particle detector for passing a liquid specimen suspending particles into an orifice so as to surround the liquid specimen with a sheath liquid, and detecting particles individually depending on the changes based on the difference of the electric impedance of liquid and particles, which comprises
- means for passing and recovering a multilayer flow consisting of a conductive liquid specimen as inner layer, a conductive first sheath liquid as middle layer, and a nonconductive second sheath liquid surrounding them as outer layer, through an orifice, and
- a pair of electrodes disposed at both sides of the orifice so as to contact the conductive liquid.
- 2. A particle detector according to claim 1, wherein the means for passing and recovering the multilayer flow through the orifice comprises
- a liquid specimen outlet pipe disposed at the upstream side of the liquid from the orifice,
- a first sheath liquid outlet pipe disposed concentrically on the outer side of the liquid specimen outlet pipe, and
- at least one recovery pipe.
- 3. A particle detector according to claim 2, wherein said recovery pipe comprises
- a first pipe disposed at the downstream side of the liquid from the orifice, and
- a second pipe disposed concentrically on the outer circumference of said first pipe.
- 4. A particle detector according to claim 2, wherein the first sheath liquid outlet pipe and said recovery pipe may be composed of conductive material to form electrodes.
- 5. A particle detecting apparatus for passing a liquid specimen suspending particles into an orifice so as to surround the liquid specimen with a sheath liquid, and detecting particles individually depending on the changes based on the difference of the electric impedance of liquid and particles, which comprises
- means for passing and recovering a multilayer flow consisting of a conductive liquid specimen as inner layer,
- a conductive first sheath liquid as middle layer, and a nonconductive second sheath liquid surrounding them as outer layer, through an orifice,
- a pair of electrodes disposed at both sides of the orifice so as to contact with the conductive liquid, and
- a detector circuit connected to this pair of electrodes for detecting a parallel signal on the basis of the electric impedance between the electrodes.
- 6. A particle detector apparatus according to claim 5, wherein the means for passing and recovering the multilayer flow through the orifice comprises
- a liquid specimen outlet pipe disposed at the upstream side of the liquid from the orifice,
- a first sheath liquid outlet pipe disposed concentrically on the outer side of the liquid specimen outlet pipe,
- at least one recovery pipe, and
- liquid specimen supply means and first sheath liquid supply means, respectively connected to the liquid outlet pipe, and the first sheath liquid outlet pipe.
- 7. A particle detector apparatus according to claim 6, wherein said recovery pipe comprises
- a first pipe disposed at the downstream side of the liquid from the orifice, and
- a second pipe disposed concentrically on the outer circumference to the first pipe.
- 8. A particle detecting apparatus according to claim 6, wherein the first sheath liquid outlet pipe and said recovery pipe are composed of conductive material to form electrodes. .Iadd.9. A particle detector for passing a liquid specimen suspending particles into an orifice so as to surround the liquid specimen with a sheath liquid, and detecting particles individually depending on the changes based on the difference of the electric impedance of liquid and particles, which comprises:
- means for passing and recovering a multilayer flow consisting of a conductive liquid specimen as inner layer and a nonconductive sheath liquid surrounding it as outer layer, through an orifice, and
- a pair of electrodes disposed at both sides of the orifice so as to contact the conductive liquid. .Iaddend..Iadd.10. A particle detector according to claim 9, wherein the means for passing and recovering the multilayer flow through the orifice comprises:
- a liquid specimen outlet pipe disposed at the upstream side of the liquid from the orifice,
- a first sheath liquid outlet pipe disposed concentrically on the outer side of the liquid specimen outlet pipe, and
- at least one recovery pipe. .Iaddend..Iadd.11. A particle detecting apparatus for passing a liquid specimen suspending particles into an orifice so as to surround the liquid specimen with a sheath liquid, and detecting particles individually depending on the changes based on the difference of the electric impedance of liquid and particles, which comprises:
- means for passing and recovering a multilayer flow consisting of a conductive liquid specimen as inner layer, and a nonconductive sheath liquid surrounding it as outer layer, through an orifice,
- a pair of electrodes disposed at both sides of the orifice so as to contact with the conductive liquid, and
- a detector circuit connected to this pair of electrodes for detecting a parallel signal on the basis of the electric impedance between the electrodes. .Iaddend..Iadd.12. A particle detector apparatus according to claim 11, wherein the means for passing and recovering the multilayer flow through the orifice comprises:
- a liquid specimen outlet pipe disposed at the upstream side of the liquid from the orifice,
- a first sheath liquid outlet pipe disposed concentrically on the outer side of the liquid specimen outlet pipe,
- at least one recovery pipe, and
- liquid specimen supply means and first sheath liquid supply means, respectively connected to the liquid outlet pipe, and the first sheath liquid outlet pipe. .Iaddend.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2-340798 |
Nov 1990 |
JPX |
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Parent Case Info
.Iadd.This is a continuation of application Ser. No. 08/309,779, filed on Sep. 21, 1994, now abandoned, which is a reissue application of U.S. Pat. No. 5,150,037, issued on Sep. 22, 1992. .Iaddend.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
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2201894 |
Jul 1973 |
DEX |
2750447 |
May 1979 |
DEX |
Continuations (1)
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Number |
Date |
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Parent |
309779 |
Sep 1994 |
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Reissues (1)
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Number |
Date |
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Parent |
757705 |
Sep 1991 |
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