US3582664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensated photoelectric measurement of fluids
Assignee: Individual
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Filing: 1968-01-15
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Granted: 1971-06-01
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Expires: 1988-01-15
Abstract
No abstract record available.
Inventors
- 👤 Jiri Hrdina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:37
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/255
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
165 words
A method for photoelectric measuring of specimens within a measuring cell including the steps of forming a beam of substantially parallel light rays from a light source, directing a first portion of said light rays through a flow cell and into a sensing photoelectric member, directing a second portion of said light rays upon a referential photoelectric member, and comparing the output of said photoelectric members wherein the improvement comprises the steps of: selecting one of a plurality of interchangeable spectrally acting filters; passing said beam of substantially parallel light rays emanating from a controllable light source through said selected one interchangeable spectrally acting filter prior to directing said second portion of said light rays upon a referential photoelectric member; maintaining a constant reference voltage from said referential photoelectric member; selecting one of a plurality of interchangeable measurinG cells and passing said first portion of said rays through said selected one of a plurality of interchangeable measuring cells toward and into said sensing photoelectric member.
Claim 2
Independent Claim
165 words
A method for photoelectric measuring of specimens within a measuring cell including the steps of forming a beam of substantially parallel light rays from a light source, directing a first portion of said light rays through a flow cell and into a sensing photoelectric member, directing a second portion of said light rays upon a referential photoelectric member, and comparing the output of said photoelectric members wherein the improvement comprises the steps of: selecting one of a plurality of interchangeable spectrally acting filters; passing said beam of substantially parallel light rays emanating from a controllable light source through said selected one interchangeable spectrally acting filter prior to directing said second portion of said light rays upon a referential photoelectric member; maintaining a constant reference voltage from said referential photoelectric member; selecting one of a plurality of interchangeable measurinG cells and passing said first portion of said rays through said selected one of a plurality of interchangeable measuring cells toward and into said sensing photoelectric member.
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein the reference voltage is kept constant by varying the intensity of the light source.
Claim 4
Dependent Claim
19 words
A method according to claim 1 wherein the reference voltage is kept constant by the use of differing filters.
Claim 5
Dependent Claim
131 words
In apparatus for measuring the extinction of light passing through a flow cell of the type having a light source emitting a beam of light which passes through the flow cell and impinges on a measuring photoelectric cell on the opposite side of the flow cell and including optical means for arranging said light beam in parallel rays and for reflecting a portion of said parallel rays to a reference photoelectric cell for comparison with light impinging on the measuring photoelectric cell, the improvement comprising a plurality of filters, mounting means positioning said filters in the path of said parallel light rays, and means connected to said mounting means for selectively adjusting the proportion of light reflected to said reference photoelectric cell relative to the light impinging on said flow cell.
Claim 6
Dependent Claim
131 words
In apparatus for measuring the extinction of light passing through a flow cell of the type having a light source emitting a beam of light which passes through the flow cell and impinges on a measuring photoelectric cell on the opposite side of the flow cell and including optical means for arranging said light beam in parallel rays and for reflecting a portion of said parallel rays to a reference photoelectric cell for comparison with light impinging on the measuring photoelectric cell, the improvement comprising a plurality of filters, mounting means positioning said filters in the path of said parallel light rays, and means connected to said mounting means for selectively adjusting the proportion of light reflected to said reference photoelectric cell relative to the light impinging on said flow cell.
Claim 7
Dependent Claim
89 words
In the apparatus according to claim 4 wherein said reflecting means includes a mirror having a central opening through which a portion of said light beam passes and impinges on said flow cell, another portion of said light beam being reflected by said mirror to said second photocell, said proportion adjusting means including means for screening said light rays from portions of said mirror while allowing the remainder of said light rays to impinge on other portions of said mirror and to pass through said openings in said mirror.
Claim 8
Dependent Claim
51 words
In the apparatus according to claim 5 wherein said proportioning means includes a rotary disc having openings therein movable into alignment with said light beam, and screens on said disc, said screens being shaped to cover a greater area of said openings adjacent the margin thereof than adjacent the center thereof.
Claim 9
Dependent Claim
49 words
In the apparatus according to claim 4 including adjustable resistances in said electrical circuit interconnecting said reference photoelectric cell and said measuring photoelectric cell, whereby adjustment of said resistances provides compensation for variations in proportionality between light impinging on said reference photoelectric cell and on said measuring photoelectric cell.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |