Patent US4380392A successfully refreshed from Google Patents.
US4380392A
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US
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Method and apparatus for calibration of instruments serving to count and to determine the size of particles suspended in dispersion medium
Assignee: Individual
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Filing: 1981-03-18
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Granted: 1983-04-19
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Expires: 2001-03-18
Abstract
Abstract An instrument for counting and determining the size of particles suspended in a dispersion medium is calibrated by setting a certified particle contained in the dispersion medium in motion so that the particle repeatedly crosses the sensing zone of the instrument under calibration. An apparatus for accomplishing the calibration method comprises a vessel wherein a dispersion medium and a certified particle are placed and an actuator to set the certified particle in motion whereby a disperse system flow is simulated. Passing a flux of a radiant energy, such as light, through the dispersion medium gives rise to radiation pulses which are used as a basis to set the threshold of sensitivity of the instrument under calibration.
Inventors
- 👤 Mikhail A. Karabegov
- 👤 Aram G. Ovanesian
- 👤 Eduard A. Mesropian
- 👤 Georgy T. Metreveli
- 👤 Anatoly A. Karpeev
- 👤 Boris K. Khoshtaria
- 👤 Tatyana I. Gventsadze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:51
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/02; G01N15/0205; G01N15/10; G01N15/1012; G01N2015/1016
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A method for calibrating an optical sensing apparatus which counts particles suspended in a fluid by (i) passing said fluid through a measuring tube having a transparent portion, and (ii) passing a transverse plane of light through said transparent portion of said tube to impinge upon a photodetector, so that particles in said fluid intercept said light and vary the output of the photodetector, said method comprising the steps of: providing a vertically oriented calibration tube having a transparent portion aligned with said light plane, said calibration tube having closed upper and lower ends and containing a certified particle; and vibrating said lower end of said calibration tube to cause said particle to repetitively intercept said light plane at a predetermined frequency, to cause the output of said photodetector to vary in accordance therewith.
Claim 2
Independent Claim
134 words
A method for calibrating an optical sensing apparatus which counts particles suspended in a fluid by (i) passing said fluid through a measuring tube having a transparent portion, and (ii) passing a transverse plane of light through said transparent portion of said tube to impinge upon a photodetector, so that particles in said fluid intercept said light and vary the output of the photodetector, said method comprising the steps of: providing a vertically oriented calibration tube having a transparent portion aligned with said light plane, said calibration tube having closed upper and lower ends and containing a certified particle; and vibrating said lower end of said calibration tube to cause said particle to repetitively intercept said light plane at a predetermined frequency, to cause the output of said photodetector to vary in accordance therewith.
Claim 3
Dependent Claim
20 words
A method for calibration as defined in claim 1, where the certified particle is caused to execute a reciprocating motion.
Claim 4
Dependent Claim
30 words
A method for calibration as defined in claim 1 or 2, wherein said plane of light is optionally magnified and an enlarged image thereof is intercepted by the certified particle.
Claim 5
Dependent Claim
34 words
The method according to claim 1, wherein said otical sensing apparatus produces an enlarged image of said plane of light, and said calibration tube has the transparent portion thereof coincident with said enlarged image.
Claim 6
Dependent Claim
112 words
Calibration apparatus for calibrating an optical sensing apparatus which counts particles suspended in a fluid by passing light through the fluid, said calibration apparatus comprising: a vertically oriented calibration tube having a transparent section for transmitting a beam of light transverse to said tube, said tube having closed upper and lower ends and containing a certified particle; photo-optical means for generating said light beam and providing an output signal which varies in accordance with variation in the transmissibility through said section of said tube; and means for modulating said output signal by vibrating said lower end of said tube to cause said light beam to be repetitively intercepted by said certified particle.
Claim 7
Dependent Claim
112 words
Calibration apparatus for calibrating an optical sensing apparatus which counts particles suspended in a fluid by passing light through the fluid, said calibration apparatus comprising: a vertically oriented calibration tube having a transparent section for transmitting a beam of light transverse to said tube, said tube having closed upper and lower ends and containing a certified particle; photo-optical means for generating said light beam and providing an output signal which varies in accordance with variation in the transmissibility through said section of said tube; and means for modulating said output signal by vibrating said lower end of said tube to cause said light beam to be repetitively intercepted by said certified particle.
Claim 8
Dependent Claim
42 words
An apparatus as defined in claim 5, wherein said tube is closed at its lower end by a flexible diaphragm and said modulating means comprises a vibrator interacting with the flexible diaphragm of said vessel to impart motion to the certified particle.
Claim 9
Dependent Claim
41 words
An apparatus as defined in claim 6, wherein said tube has (i) at its lower end a flare closed by a flexible diaphragm, and (ii) in its inner space, perforated horizontal partitions to restrict the vertical travel of the certified particle.
Claim 10
Dependent Claim
38 words
An apparatus as defined in claim 7, wherein said tube has at its upper end a flare closed by a second flexible diaphragm, and another vibrator coupled to said second diaphragm to positively move the certified particle down.
Claim 11
Dependent Claim
16 words
The calibration apparatus according to claim 5, wherein said calibration tube is filled with a fluid.
Claim 12
Dependent Claim
47 words
The calibration apparatus according to claim 5 or 9, wherein said upper and lower ends of said calibration tube each comprise a flexible diaphragm, and said modulating means comprises means for synchronously vibrating said diaphragms so that they move in opposite directions with respect to said tube.
Claim 13
Dependent Claim
30 words
The calibration apparatus according to claim 5, further comprising means for producing an enlarged image of said light beam, said photo-optical means including a photodetector responsive to said enlarged image.
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) | 1986-04-18 | 1986-10-18 | 1987-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-18 | 1990-10-18 | 1991-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-18 | 1994-10-18 | 1995-04-19 | $7700.00 | Window Closed / Lapsed |