US3867835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calibration of particle velocity measuring instrument
Assignee: Artek Systems Corp
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Filing: 1973-10-19
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Granted: 1975-02-25
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Expires: 1993-10-19
Abstract
Abstract In an analytical apparatus for analysis of particulate motion in a flow cell, there is provided, for calibration of the analytical apparatus, a movable calibration slide generally disposed to translate into and out of the optical viewing path of the analytical system devoted to calculating particle related information. Appropriately located upon the surface of the slide is a predetermined number of contrast regions representing particles. The slide is translated at a given rate within the optical viewing path and simulates predetermined particle movement for use in calibration of analytical devices for obtaining particle information.
Inventors
- 👤 Roger E Button
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:34
CPC Classifications
G; G01; G01P; G01P21/00; G01P21/02; G01P21/025; G01P5/00; G01P5/001
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
A calibration apparatus for calibrating a particle velocity measuring instrument defining an optical path for optically viewing particulate matter to generate signals as a function of the velocity of the particulate matter, comprising: a slide disposed for receiving light emanating from along the defined optical path; areas of contrast disposed upon the slide for receiving the light emanating from along the optical path to be optically viewed by the particle velocity measuring instrument; and means for moving the areas of contrast disposed upon the slide in a linear path at a predetermined rate across the received light emanating from along the optical path for the generation of calibration signals as a function of the velocity of the areas of contrast traversing the received light at a predetermined rate.
Claim 2
Dependent Claim
128 words
A calibration apparatus for calibrating a particle velocity measuring instrument defining an optical path for optically viewing particulate matter to generate signals as a function of the velocity of the particulate matter, comprising: a slide disposed for receiving light emanating from along the defined optical path; areas of contrast disposed upon the slide for receiving the light emanating from along the optical path to be optically viewed by the particle velocity measuring instrument; and means for moving the areas of contrast disposed upon the slide in a linear path at a predetermined rate across the received light emanating from along the optical path for the generation of calibration signals as a function of the velocity of the areas of contrast traversing the received light at a predetermined rate.
Claim 3
Dependent Claim
29 words
The calibration apparatus as defined in claim 1, wherein the areas of contrast upon the slide are disposed for traversing the optical path defined by the velocity measuring instrument.
Claim 4
Dependent Claim
52 words
The calibration apparatus as defined in claim 1, including means for passing light emanating from along the defined optical path to the slide and the areas of contrast disposed upon the slide where the slide and the areas of contrast are disposed outside the optical path defined by the velocity measuring instrument.
Claim 5
Dependent Claim
34 words
The calibration apparatus as defined in claim 3, wherein the means for passing light emanating from along the defined optical path is a beam splitter disposed for receiving light along the defined optical path.
Claim 6
Dependent Claim
46 words
The calibration apparatus as defined in claim 1, wherein the slide is substantially flat and is defined of material having given optical properties and has disposed on one of its surfaces, areas of contrast which have optical properties differing from the optical properties of the slide.
Claim 7
Dependent Claim
25 words
The calibration apparatus as defined in claim 1, wherein the slide is translucent and the areas of contrast disposed upon the slide are substantially opaque.
Claim 8
Dependent Claim
68 words
The calibration apparatus as defined in claim 1, wherein the means for moving the areas of contrast disposed upon a slide in a linear path at a predetermined rate includes a lead screw having two ends one of which is connected to the slide the other of which is connected to a controlled motor for translating the slide across the received light emanating from along the optical path.
References Cited (Backward Citations)
DE1145830B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |