US3728031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multichromatic multibeam absorption photometer
Assignee: Milton Roy LLC
•
Filing: 1971-11-29
•
Granted: 1973-04-17
•
Expires: 1991-11-29
Abstract
Abstract Apparatus for simultaneously and continuously comparing the absorption in two sample cells at two wavelengths. Two adjacent sample cells are illuminated from adjacent sources radiating at different wavelengths. A first lens positioned near the cells forms images of the two sources. A second lens positioned near the source images forms images of the cells. A plane mirror just behind the second lens displaces radiation from one source so that there are formed two sets of cell images, each at a different wavelength. Photocells at the cell images, and a comparison circuit, allow the absorption in both cells at both wavelengths to be compared.
Inventors
- 👤 E Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:35
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/16; G01J1/1626; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
Apparatus for the simultaneous measurement of the optical properties of at least two materials at at least two wavelengths which comprises: an array of at least two sources of electromagnetic radiation, each radiating in a different wavelength region; first means for forming an image of said array; means for positioning at least two materials near said first means in the path of radiation forming said image; second means positioned slightly ahead of the image plane of said array for forming an image of said materials; at least one mirror positioned substantially in the image plane of said array to direct radiation from at least one of said sources in a different direction than radiation from another of said sources to form at least two sets of images of said materials, each of said sets being formed from radiation derived from a different source; and means for comparing the relative intensities of said material images as a measure of the optical properties of said materials at various wavelengths.
Claim 2
Dependent Claim
167 words
Apparatus for the simultaneous measurement of the optical properties of at least two materials at at least two wavelengths which comprises: an array of at least two sources of electromagnetic radiation, each radiating in a different wavelength region; first means for forming an image of said array; means for positioning at least two materials near said first means in the path of radiation forming said image; second means positioned slightly ahead of the image plane of said array for forming an image of said materials; at least one mirror positioned substantially in the image plane of said array to direct radiation from at least one of said sources in a different direction than radiation from another of said sources to form at least two sets of images of said materials, each of said sets being formed from radiation derived from a different source; and means for comparing the relative intensities of said material images as a measure of the optical properties of said materials at various wavelengths.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said sources are derived from a common primary source.
Claim 4
Dependent Claim
15 words
The apparatus of claim 1 wherein said first and second image forming means are lenses.
Claim 5
Dependent Claim
20 words
The apparatus of claim 1 wherein said means for positioning comprises a cell defining first and second sample chambers therein.
Claim 6
Dependent Claim
24 words
The apparatus of claim 4 wherein said cell includes inlet and outlet tubing means in fluid flow communication with each of said sample chambers.
Claim 7
Dependent Claim
22 words
The apparatus of claim 1 wherein said means for comparing comprises a photoelectric sensor positioned to receive each of said materiaL images.
Claim 8
Dependent Claim
54 words
The apparatus of claim 6 wherein the photoelectric sensors for a first set of material images are connected in a first bridge circuit, the photoelectric sensors for a second set of material images are connected in a second bridge circuit, and the outputs of said bridge circuits are arranged for connection to a recorder.
Claim 9
Dependent Claim
161 words
Apparatus for the simultaneous measurement of the optical absorption of two materials at two wavelengths which comprises: two sources of electromagnetic radiation, each radiating in a different wavelength region; a first lens positioned to form an image of said sources; a cell defining first and second sample chambers positioned near said first lens in the path of radiation forming said source image; a second lens positioned slightly ahead of the source image plane to form an image of said sample chambers; an angled mirror having a knife edge positioned substantially in said source image plane to direct radiation from one of said sources in a different direction than radiation from the other of said sources to form two sets of images of said chambers, each set being formed from radiation derived from a different source; and means for comparing the relative intensities of said chamber images as a measure of the relative absorption of samples within said chambers at both wavelengths.
Claim 10
Dependent Claim
161 words
Apparatus for the simultaneous measurement of the optical absorption of two materials at two wavelengths which comprises: two sources of electromagnetic radiation, each radiating in a different wavelength region; a first lens positioned to form an image of said sources; a cell defining first and second sample chambers positioned near said first lens in the path of radiation forming said source image; a second lens positioned slightly ahead of the source image plane to form an image of said sample chambers; an angled mirror having a knife edge positioned substantially in said source image plane to direct radiation from one of said sources in a different direction than radiation from the other of said sources to form two sets of images of said chambers, each set being formed from radiation derived from a different source; and means for comparing the relative intensities of said chamber images as a measure of the relative absorption of samples within said chambers at both wavelengths.
Claim 11
Dependent Claim
23 words
The apparatus of claim 8 wherein said cell includes inlet and outlet tubing in fluid flow communication with each of said sample chambers.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |