US3709600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for gas analysis with a rotatable cylindrically shaped chopper
Assignee: Individual
•
Filing: 1971-04-19
•
Granted: 1973-01-09
•
Expires: 1991-04-19
Abstract
Abstract A device for gas analysis by measurement of absorption of electromagnetic, especially optic, radiation comprises a radiation source emitting a beam of electromagnetic radiation which is splitted by a beam splitter into a sensing beam and a reference beam passing through a sensing chamber and a reference chamber, respectively to radiation sensitive means responding to the difference in intensity of the sensing and reference rays and providing a corresponding electric output signal. A rotary shutter is arranged between the radiation source and the beam splitter to chop up the emitted beam before it enters into the beam splitter. The rotary shutter or chopper comprises preferably strip-shaped elements which form parts of a cylinder, the elements having edges parallel to the axis of the cylinder and rotating around the axis of the cylinder in a circular path which includes or encompasses the radiation source.
Inventors
- 👤 P Ganshorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:35
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/37
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
252 words
Device for gas analysis by measurement of absorption of radiation comprising a radiation source (16) elongated in a given direction; an elongated casing member (12) forming a chamber (14) in which said radiation source (16) is positioned, said chamber having a radiation exit opening (20) elongated in said given direction; a beam splitter (24) having an elongated entrance opening (22) facing, and opposed to said exit opening (20) and two tube-like channels (28, 30) having highly polished inner surfaces beginning at said elongated entrance opening (22) and ending in two channel exit openings; specimen and reference vessels (32, 34) one each positioned in front of one of said channel exit openings; radiation sensing means (36) responding to the difference in intensity of sensing and reference beams emerging from said channel exit openings and travelling through respective vessels (32, 34) to said radiation sensing means (36); and a rotary shutter (38) comprising strip-like elements (42) extending essentially parallel to said given direction and cylindrically surrounding the radiation source to alternately block and permit passage of radiation from the source (16) to the elongated entrance opening (22), the rotary shutter strips forming parts of a cylindrical envelope and having edges parallel to the axis of the cylindrical envelope and extending in said given direction, said rotary shutter being mounted to rotate around an axis essentially parallel to said given direction and along a path coaxial with said casing member to provide a shutter path going through the space between said exit and entrance openings.
Claim 2
Dependent Claim
252 words
Device for gas analysis by measurement of absorption of radiation comprising a radiation source (16) elongated in a given direction; an elongated casing member (12) forming a chamber (14) in which said radiation source (16) is positioned, said chamber having a radiation exit opening (20) elongated in said given direction; a beam splitter (24) having an elongated entrance opening (22) facing, and opposed to said exit opening (20) and two tube-like channels (28, 30) having highly polished inner surfaces beginning at said elongated entrance opening (22) and ending in two channel exit openings; specimen and reference vessels (32, 34) one each positioned in front of one of said channel exit openings; radiation sensing means (36) responding to the difference in intensity of sensing and reference beams emerging from said channel exit openings and travelling through respective vessels (32, 34) to said radiation sensing means (36); and a rotary shutter (38) comprising strip-like elements (42) extending essentially parallel to said given direction and cylindrically surrounding the radiation source to alternately block and permit passage of radiation from the source (16) to the elongated entrance opening (22), the rotary shutter strips forming parts of a cylindrical envelope and having edges parallel to the axis of the cylindrical envelope and extending in said given direction, said rotary shutter being mounted to rotate around an axis essentially parallel to said given direction and along a path coaxial with said casing member to provide a shutter path going through the space between said exit and entrance openings.
Claim 3
Dependent Claim
33 words
Device according to claim 1 wherein adjusting screws (46), which can be screwed into the channels (28, 30) are provided to adjust the relative relationship of the split beams passing through said channels.
Claim 4
Dependent Claim
17 words
Device in accordance with claim 2 in which the ends of the adjusting screws (46) are blackened.
Claim 5
Dependent Claim
43 words
Device in accordance with claim 1 comprising windows (50, 52) transparent to radiation in the channels and closing the entrance opening (22) and the channel exit openings of the beam splitter (24); and means (54) for filling the channels with a dummy gas.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |