WO1990004774A1 - Optically active biological particle distinguishing apparatus - Google Patents
Optically active biological particle distinguishing apparatus Download PDFInfo
- Publication number
- WO1990004774A1 WO1990004774A1 PCT/US1988/003648 US8803648W WO9004774A1 WO 1990004774 A1 WO1990004774 A1 WO 1990004774A1 US 8803648 W US8803648 W US 8803648W WO 9004774 A1 WO9004774 A1 WO 9004774A1
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- light
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Classifications
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- 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
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1434—Optical arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
-
- 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
- G01N15/01—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials specially adapted for biological cells, e.g. blood cells
-
- 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
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
- G01N15/0211—Investigating a scatter or diffraction pattern
-
- 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
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1456—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals
- G01N15/1459—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals the analysis being performed on a sample stream
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
- G01N2021/216—Polarisation-affecting properties using circular polarised light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N2021/4792—Polarisation of scatter light
Definitions
- the field of the invention relates to organic particle sorting and identification and more particularly to identifying and distinguishing organic particles such as microorganisms, viruses, pollen and eukaryotic cell types.
- This invention is the result of a contract with the Department of Energy (Contract No. -7405-ENG-36.)
- optical modulators are driven at high frequencies on the order of 40 mHz. Such high frequencies are needed to obtain information from fast moving (10 meters per second) single cells in a cell stream.
- a low frequency source such as of the aforementioned experiments produces too long a pulse to obtain information from a fast moving cell because the cell would not be present during the full duration of the pulse.
- fast moving cells due to rapid light cycling, fast moving cells can be analyzed one at a time and the cells can be of a variety of types whereas the
- One object of the invention is to uniquely identify a variety of bacteria, viruses, pollens and eukaryotic cells.
- Another object of the present invention is to distinguish cells or organic particles in a cell stream utilizing circular intensity differential scattering and linear intensity differential scattering from the cells.
- One advantage of the invention is that no staining or fixation of cells is required.
- Another advantage of the instant invention is that live cells can be analyzed and sorted.
- an apparatus for identifying and distinguishing organic particles in a cell stream comprising structure for producing from a continuous beam of light left and right circularly polarized components and for optically modulating the components at a first frequency.
- the polarized modulated components pass through a stream containing the organic particles to be identified or distinguished.
- Light from the components scattered and amplitude modulated by the particles is then further polarized and optically modulated at a second frequency which differs from the first frequency.
- the further polarized and optically amplitude modulated scattered light is received and analyzed in order to identify or distinguish the organic particles in the stream.
- the Figure is a schematic showing of a preferred embodiment of the invention.
- a light source 10 which may be, for example, a continuous wave laser operating in the ultraviolet, visible, or infrared portion of the spectrum.
- a beam 12 produced by laser 10 passes through a beam expander 14 which comprises standard optics well-known to those skilled in the art.
- the expanded beam passes through a polarizer 16 which in the preferred embodiment comprises a prism polarizer having its passing axis set at 90° to the horizontal plane of the drawing. Alternatively, the polarizer 16 may have its passing axis disposed at a positive 45° to the horizontal plane.
- Polarizer 16 selects the vertical linearly polarized component in the incident beam.
- the polarized beam then passes through an optical modulator 18 preferably set at , an angle of +45° to the horizontal plane.
- Modulator 18 may be a Pockels .Cell driven up to about 40 MHz by, for example, an oscillator 20 operated at a first frequency F 1 near about 40 MHz.
- Optical modulator 18 converts the linearly polarized beam into oscillating left and right circular polarized components at the frequency F, .
- a second or alternative orientation for optical modulator 18 is at 0° with respect to the reference horizontal plane.
- the circularly polarized components of the beam pass through focusing and beam shaping optics 22 which are well known to those skilled in the art.
- Optics 22 focus the beam on a cell stream 24 passing through a flow chamber 26 which may be one such as described in U.S. Pat. 4,200,802 or 4,224,567.
- the cell stream may be, for example, 10 ⁇ m in diameter and may contain bacteria, viruses, microorganisms and/or eukaryotic cells, all of which pass in single file.
- the focused beam intersects a stream of organic particles in the cell stream 24.
- the beam components are amplitude
- SUBSTITUTESHEET modulated and scattered at an angle by each cell as it passes through the flow chamber ⁇ .
- Amplitude modulation is proportional to the circular birefringence of a cell at the frequency F, and is proportional to the linear birefringence of the cell at a frequency of twice F 1 (2F_,) .
- Collection optics 28 collect the scattered light components. It will be appreciated that such optics are only schematically shown herein and may be disposed substantially about the flow chamber 26. Collection optics 28 pass the components to a second optical modulator 30, preferably set at an angle of +45° to the horizontal reference plane. Modulator 30 operates at a second frequency F 2 which is different from F_,.
- An alternative orientation for optical modulator 30 is with its fast axis parallel to the horizontal reference plane.
- An oscillator 31 supplies frequency F 2 to optical modulator 30.
- the scattered beam components then pass through a second polarizer 32, preferably a prism polarizer set at an angle of 90° to the horizontal reference plane. Alternatively its orientation may be at -45° to the horizontal reference plane.
- the beam components are then focused onto a spatial filter 34, such as a pinhole and pass therethrough to impinge on the face of a photodetector 36 such as a photomultiplier tube which produces an output signal on a line 38.
- a preamplifier 40 amplifies the output signal.
- Two phase sensitive detectors 42 and 44 extract the amplitude modulated components at frequencies F_, and F 2 from the amplified output signal.
- a filter-amplifier combination 46 and 48 detects an envelope signal proportional to the total amount of scattered light at angle ⁇ .
- Oscillator 20 supplies frequency F, to phase sensitive detectors 42 and 44 through lines 50 and 52.
- I L ( ⁇ ) - I R ( ⁇ ) CIDS ( ⁇ ) ITOTA W
- I L ( ⁇ ) the amount of light scattered into ⁇ when the incident beam is left circularly polarized
- I R ( ⁇ ) the amount of light scattered into ⁇ when the incident beam is right circularly polarized
- I ( ⁇ ) the amount of light scattered when the incident beam is polarized perpendicular to the scattering plane
- the two signals CIDS( ⁇ ) and POL( ⁇ ) can be used separately or in combination to uniquely identify a variety of organic particles such as bacteria, viruses, pollen, and eukaryotic cells. No staining or fixation is required and live cells can be analyzed and sorted. Each type of organic particle can be determined or identified
- SUBSTITUTE SHEET by its unique CIDS( ⁇ ) and POL( ⁇ ) signature.
- a plurality of photodetectors may be disposed at various angles with respect to the direction of beam, although for purposes of illustration only one photodetector is shown.
- the scattering plane is defined by a ray along the incident light beam and a ray from the object to the detector.
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- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Abstract
The disclosure is directed to organic particle sorting and identification. High frequency pulses of circularly polarized light, alternating between left and right, is formed by passing the beam (12) from a laser (10) through, in succession, a beam expander (14), a polarizer (16), an optical modulator (18) driven by an oscillator (20) and focussing and shaping optics (22) to intersect a fast moving stream of organic particles (24). Circular intensity differential scattering and linear intensity differential scattering are monitored by collecting light scattered from stream (24) with, in succession, collection optics (28), optical modulator (30) driven by oscillator (31), polarizer (32), spatial filter (34), and photodetector (36).
Description
OPTICALLY ACTIVE BIOLOGICAL PARTICLE DISTINGUISHING APPARATUS
BACKGROUND OF THE INVENTION
The field of the invention relates to organic particle sorting and identification and more particularly to identifying and distinguishing organic particles such as microorganisms, viruses, pollen and eukaryotic cell types. This invention is the result of a contract with the Department of Energy (Contract No. -7405-ENG-36.)
Cell sorting is a well established field and includes electrical cell analyzing devices such as disclosed in
U.S. Pats. 3,924,180 and 3,946,239 to Salzman et al. and U.S. Pat. 4,224,567 to Hoffman. While these devices are able to discern certain characteristics about cells, they are unable to determine differences in the long range order of the genetic material among different cell types. Some experimenters have looked at cells in suspension. Two publications, Thompson, Bottiger and Fry (Applied Optics 19., 1323 (1980) and Hunt and Huffman, (Rev. Sci. Instrument 44 1753 (1973)) disclose experiments on cells in .suspension using polarized light. The devices used in such experiments are limited to looking at a group of cells in suspension, such as 108 viruses. Too, their light source have only been cycled by Pockels cells driven by alternating high voltage at low freguencies, at 100 kHz maximum.
In practicing the invention, optical modulators are driven at high frequencies on the order of 40 mHz. Such high frequencies are needed to obtain information from fast moving (10 meters per second) single cells in a cell stream. A low frequency source such as of the aforementioned experiments produces too long a pulse to obtain information from a fast moving cell because the cell would not be present during the full duration of the pulse. In practicing the invention, due to rapid light cycling, fast moving cells can be analyzed one at a time and the cells can be of a variety of types whereas the
SUBSTITUTESHEET
Thompson et al. and Hunt et al. devices are limited to the study of suspensions of a single strain of cells.
One object of the invention is to uniquely identify a variety of bacteria, viruses, pollens and eukaryotic cells.
Another object of the present invention is to distinguish cells or organic particles in a cell stream utilizing circular intensity differential scattering and linear intensity differential scattering from the cells. One advantage of the invention is that no staining or fixation of cells is required.
Another advantage of the instant invention is that live cells can be analyzed and sorted.
SUBSTITUTESHEET
SUMMARY OF THE INVENTION
In accordance with the invention, there is provided an apparatus for identifying and distinguishing organic particles in a cell stream comprising structure for producing from a continuous beam of light left and right circularly polarized components and for optically modulating the components at a first frequency. The polarized modulated components pass through a stream containing the organic particles to be identified or distinguished. Light from the components scattered and amplitude modulated by the particles is then further polarized and optically modulated at a second frequency which differs from the first frequency. The further polarized and optically amplitude modulated scattered light is received and analyzed in order to identify or distinguish the organic particles in the stream.
SUBSTITUTESHEET
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawing, which is incorporated in and forms a part of the specification, illustrates a preferred embodiment of the present invention and, together with the description, serves to explain the principles of the invention. In the drawing:
The Figure is a schematic showing of a preferred embodiment of the invention.
SUBSTITUTE SHEET
DESCRIPTION OF THE PREFERRED EMBODIMENT
Reference is now made to the Figure which shows a preferred embodiment of the invention comprising a light source 10 which may be, for example, a continuous wave laser operating in the ultraviolet, visible, or infrared portion of the spectrum. A beam 12 produced by laser 10 passes through a beam expander 14 which comprises standard optics well-known to those skilled in the art. The expanded beam passes through a polarizer 16 which in the preferred embodiment comprises a prism polarizer having its passing axis set at 90° to the horizontal plane of the drawing. Alternatively, the polarizer 16 may have its passing axis disposed at a positive 45° to the horizontal plane.
Polarizer 16 selects the vertical linearly polarized component in the incident beam. The polarized beam then passes through an optical modulator 18 preferably set at , an angle of +45° to the horizontal plane. Modulator 18 may be a Pockels .Cell driven up to about 40 MHz by, for example, an oscillator 20 operated at a first frequency F1 near about 40 MHz. Optical modulator 18 converts the linearly polarized beam into oscillating left and right circular polarized components at the frequency F, . A second or alternative orientation for optical modulator 18 is at 0° with respect to the reference horizontal plane.
From modulator 18 the circularly polarized components of the beam pass through focusing and beam shaping optics 22 which are well known to those skilled in the art. Optics 22 focus the beam on a cell stream 24 passing through a flow chamber 26 which may be one such as described in U.S. Pat. 4,200,802 or 4,224,567. The cell stream may be, for example, 10 μm in diameter and may contain bacteria, viruses, microorganisms and/or eukaryotic cells, all of which pass in single file. The focused beam intersects a stream of organic particles in the cell stream 24. The beam components are amplitude
SUBSTITUTESHEET
modulated and scattered at an angle by each cell as it passes through the flow chamber θ. Amplitude modulation is proportional to the circular birefringence of a cell at the frequency F, and is proportional to the linear birefringence of the cell at a frequency of twice F1 (2F_,) . Collection optics 28 collect the scattered light components. It will be appreciated that such optics are only schematically shown herein and may be disposed substantially about the flow chamber 26. Collection optics 28 pass the components to a second optical modulator 30, preferably set at an angle of +45° to the horizontal reference plane. Modulator 30 operates at a second frequency F2 which is different from F_,. An alternative orientation for optical modulator 30 is with its fast axis parallel to the horizontal reference plane.
An oscillator 31 supplies frequency F2 to optical modulator 30.
The scattered beam components then pass through a second polarizer 32, preferably a prism polarizer set at an angle of 90° to the horizontal reference plane. Alternatively its orientation may be at -45° to the horizontal reference plane. The beam components are then focused onto a spatial filter 34, such as a pinhole and pass therethrough to impinge on the face of a photodetector 36 such as a photomultiplier tube which produces an output signal on a line 38. A preamplifier 40 amplifies the output signal. Two phase sensitive detectors 42 and 44 extract the amplitude modulated components at frequencies F_, and F2 from the amplified output signal. A filter-amplifier combination 46 and 48 detects an envelope signal proportional to the total amount of scattered light at angle θ. Oscillator 20 supplies frequency F, to phase sensitive detectors 42 and 44 through lines 50 and 52.
SUBSTITUTE SHEET
The circular intensity differential scattering is given by
IL (Θ) - IR (Θ) CIDS (Θ) = ITOTA W where IL(Θ) = the amount of light scattered into θ when the incident beam is left circularly polarized,
IR(Θ) = the amount of light scattered into θ when the incident beam is right circularly polarized, and
IT0TAL(Θ) = IL(Θ) + IR(Θ) = total amount of light scattered into θ.
The linear intensity differential scattering is given by I. (θ) - I±(θ)
POL(Θ) =
ΪTOTAL 0 )
wher.e Iι(θ) = the amount of light scattered when the incident beam is linearly polarized, parallel to the scattering plane,
I (θ) = the amount of light scattered when the incident beam is polarized perpendicular to the scattering plane, and
IT0TAL(Θ) = Ij(θ) + I±(θ) = IL(Θ) + IR(Θ) = total amount of light scattered.
The two signals CIDS(Θ) and POL(Θ) can be used separately or in combination to uniquely identify a variety of organic particles such as bacteria, viruses, pollen, and eukaryotic cells. No staining or fixation is required and live cells can be analyzed and sorted. Each type of organic particle can be determined or identified
SUBSTITUTE SHEET
by its unique CIDS(Θ) and POL(Θ) signature. In practicing the invention, a plurality of photodetectors may be disposed at various angles with respect to the direction of beam, although for purposes of illustration only one photodetector is shown.
The scattering plane is defined by a ray along the incident light beam and a ray from the object to the detector.
The foregoing description of the preferred embodiment of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiment was chosen and described in order to best .-_ explain the principles of the invention and its practical application to thereby enable others skilled in the art to' best utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims appended hereto.
SUBSTITUTE SHEET
Claims
1. An apparatus for distinguishing microorganisms, pollens and eukaryotic cell types in a cell stream, said apparatus comprising: a source for a continuous light beam of suitable diameter in the infrared to ultraviolet light range; means for selecting a linearly polarized component from the beam; first means for optically modulating the linearly polarized component of the beam into left and right circularly polarized components at a first frequency; means for shaping the circularly polarized components and for focusing on and passing the left and right circularly polarized components through a flow chamber through which a stream containing cells to be distinguished can be flowed: means for collecting the circularly polarized components scattered by a cell to be distinguished, the scattered components being amplitude modulated at said first frequency in accordance with the circular birefringence of the cell and amplitude modulated in accordance with the linear birefringence of the cell at twice said first frequency; second means for optically modulating the collected scattering beam components at a third frequency;
SUBSTITUTESHEET means for again linearly and circularly polarizing the modulated scattered beam components; means for spatially filtering said again polarized modulated scattered beam components; photodetector means for receiving* said spatially filtered amplitude modulated scattered beam components and for generating an output in accordance therewith; means for receiving and analyzing the output and for extracting the amplitude modulated component of the first and second frequencies to identify microorganisms and eukaryotic cells in the cell stream.
2. The invention of Claim 1 wherein said polarized component selecting means comprises a prism polarizer.
3. The invention of Claim 2 wherein the passing axis of said prism polarizer is set at about 90° to the beam.
4. The invention of Claim 2 wherein the passing axis of said prism polarizer is set at about 45° to the beam.
5. The invention of Claim 1 wherein said, first optically modulating means comprises a Pockels Cell driven at said first frequency which is up to about 40 MHz.
SUBSTITUTE SHEET
6. The invention of Claim 1 wherein the passing axis of said first optically modulating means is set at about 45° to the beam.
7. The invention of Claim 1 wherein the passing axis of said first optically modulating means is set at about 0° to the beam.
8. The invention of Claim 1 wherein the passing axis of said second optically modulating means is set at about 45° to the beam.
9. The invention of Claim 1 wherein the passing axis of said second optically modulating means is set , about parallel to the beam.
10. The invention of Claim 9 wherein said means for again polarizing comprises a prism polarizer set at about 90° to the beam.
11. The invention of Claim 9 wherein said means for again polarizing comprises a prism polarizer set at about -45° to the beam.
12. The invention of Claim 1 wherein said photodetector means comprises a photomultiplier tube.
SUBSTITUTESHEET
13. The invention of Claim 1 wherein said receiving end analyzing means comprises two phase sensitive detectors for extracting the amplitude modulated first and third frequency components.
14. The invention of Claim 1 wherein said receiving end analyzing means comprises a filter-amplifier combination for detecting an envelope signal proportional to the total amount of scattered light at a selected angle to the beam.
15. The invention of claim 1 wherein said receiving end analyzing means comprises means for determining the circular intensity differential scattering which is identified by
IL(Θ) - IR(Θ) CIDS(Θ) =
∑TOTAL(Θ)
where CIDS(Θ) is the circular intensity differential scattering, IL(Θ) is the amount of light scattered into θ when the incident beam is left circularly polarized, IR(Θ) is the amount of light scattered into θ when the incident beam is right circularly polarized and I-TOTAL^9) ^S I L(Θ) + IR(Θ).
SUBSTITUTESHEET
16. The invention of claim 1 wherein said received end analyzing means comprises means for determining the linear intensity differential scattering which is given by
I,(θ) - Ij.(θ) POL(Θ) = ■ ΪTOTAL 9)
where POL(Θ) is the linear intensity differential scattering, Iι(θ) is the amount of light scattered when the incident beam is linearly polarized parallel to the scattering plane, I.(θ) is the amount of light scattered when the incident beam is polarized perpendicular to the scattering plane and IT0TAL(Θ) is Iι(θ) + Ij_(θ) .
17. An apparatus for distinguishing microorganisms, pollen and eukaryotic cell types comprising: means for producing a continuous beam of light of a selected size in the infrared to ultraviolet range; means for optically amplitude modulating and circularly polarizing the beam and for passing the beam through a cell system; means for further amplitude modulating and polarizing the cell scattered light; and means for receiving and analyzing the further modulated and polarized cell scattered light.
SUBSTITUTE SHEET
18. The invention of Claim 17 wherein the optically amplitude modulating and circularly polarizing means comprises a first optical modulator driver at a first frequency, said means for further amplitude modulating and polarizing comprises a second optical modulator driver at a second frequency differs from said first frequency, and said receiving and analyzing means comprises means for processing amplitude modulated first and second frequency components of cell-scattered light to identify the microorganisms, pollen, and eukaryotic cell types in the cell stream.
19. An apparatus for categorizing organic particles in a cell stream comprising: means for producing left and right circularly polarized components of a continuous light beam optically amplitude modulated at a first frequency; means for passing the components through a cell stream; means for further polarizing and optically amplitude modulating at a second and different frequency the components as scattered by cells in the stream; and means for receiving and analyzing the further polarized and modulated components to categorize the cells in the stream.
SUBSTITUTE SHEET
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US1988/003648 WO1990004774A1 (en) | 1988-10-17 | 1988-10-17 | Optically active biological particle distinguishing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US1988/003648 WO1990004774A1 (en) | 1988-10-17 | 1988-10-17 | Optically active biological particle distinguishing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1990004774A1 true WO1990004774A1 (en) | 1990-05-03 |
Family
ID=22208954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1988/003648 Ceased WO1990004774A1 (en) | 1988-10-17 | 1988-10-17 | Optically active biological particle distinguishing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1990004774A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0424934A3 (en) * | 1989-10-26 | 1992-05-27 | Hitachi, Ltd. | Apparatus for counting particles suspended in a fluid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4140902A (en) * | 1977-08-25 | 1979-02-20 | Xonics, Inc. | Device for measurement of hair-like particulate material |
| US4306809A (en) * | 1979-03-26 | 1981-12-22 | The Board Of Regents Of The University Of Nebraska | Polarimeter |
-
1988
- 1988-10-17 WO PCT/US1988/003648 patent/WO1990004774A1/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4140902A (en) * | 1977-08-25 | 1979-02-20 | Xonics, Inc. | Device for measurement of hair-like particulate material |
| US4306809A (en) * | 1979-03-26 | 1981-12-22 | The Board Of Regents Of The University Of Nebraska | Polarimeter |
Non-Patent Citations (1)
| Title |
|---|
| APPLIED OPTICS, Vol. 19, No. 8, 15 April 1980, THOMPSON: "Measurement of Polarized Light Interactions via the Muller Matrix", pages 1323-1332 (Note Fig. 1). * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0424934A3 (en) * | 1989-10-26 | 1992-05-27 | Hitachi, Ltd. | Apparatus for counting particles suspended in a fluid |
| US5142140A (en) * | 1989-10-26 | 1992-08-25 | Hitachi, Ltd. | Apparatus for counting particles suspended in a fluid having a polarizing beam splitter |
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