US3758786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for setting both beams of an optical two-beam instrument to equal intensity
Assignee: Siemens AG
•
Filing: 1972-04-06
•
Granted: 1973-09-11
•
Expires: 1992-04-06
Abstract
Abstract In order to adjust the optical instrument to obtain equal beam intensities in each radiation channel, a part of the reflecting wall within one of the radiation channels or at the junction of the two radiation channels is replaced by a window and a surface which can be adjusted for variable reflectivity. The surface can be formed by a rotatable disc having a non-reflective half-face and a reflective half-face which, upon rotation, changes the reflection characteristics of the wall of at least one of the channels. The surface can also be formed by a strip having a wedge shaped non-reflective band thereon which strip is movable across the window in the wall of one channel.
Inventors
- 👤 J Weinel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:25
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/37
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
159 words
In a dual beam optical instrument including a radiation source disposed at one end of the instrument, a pair of radiation channels for passage of a respective beam through each, each channel having a radiation reflecting wall laterally enclosing at least a part thereof, a measuring chamber containing the gas to be analyzed to receive a beam from one of said channels, a comparison chamber containing a known gas to receive a beam from the other of said channels, and a pair of detectors at the opposite end of the instrument to detect radiation passing through said chambers, a planar surface of variable radiation reflectivity disposed in and comprising a portion of said radiation reflecting wall of at least one of said channels including a planar reflective portion for reflecting incident radiation, adjustment of said planar surface adjusting the amount of radiation reflected by the reflecting wall of each of said channels and the intensity of each beam therein.
Claim 2
Dependent Claim
159 words
In a dual beam optical instrument including a radiation source disposed at one end of the instrument, a pair of radiation channels for passage of a respective beam through each, each channel having a radiation reflecting wall laterally enclosing at least a part thereof, a measuring chamber containing the gas to be analyzed to receive a beam from one of said channels, a comparison chamber containing a known gas to receive a beam from the other of said channels, and a pair of detectors at the opposite end of the instrument to detect radiation passing through said chambers, a planar surface of variable radiation reflectivity disposed in and comprising a portion of said radiation reflecting wall of at least one of said channels including a planar reflective portion for reflecting incident radiation, adjustment of said planar surface adjusting the amount of radiation reflected by the reflecting wall of each of said channels and the intensity of each beam therein.
Claim 3
Dependent Claim
96 words
The combination as set forth in claim 1 wherein said instrument is an infra-red gas analyzing instrument which includes a beam splitter including said radiation channels for splitting radiation from an infra-red radiation source into two beams for respective passage through said channels, said surface of variable reflectivity being disposed in said reflecting wall of both said channels, and including a non-reflective planar portion disposed adjacent said reflective portion for absorbing incident radiation, for adjusting the amount of radiation reflected by the reflecting wall of each of said channels and the intensity of said beams therein.
Claim 4
Dependent Claim
106 words
The combination as set forth in claim 1 wherein said instrument is an infra-red gas analyzing instrument which includes a beam splitter including said radiation channels and having reflecting channel surfaces for splitting radiation from an infra-red radiation source into two beams for respective passage through said channels, said surface of adjustable variable radiation reflectivity being disposed in the surface of one of said channels of said beam splitter and including a non-reflective planar portion disposed adjacent said reflective portion for absorbing incident radiation, for adjusting the amount of radiation reflected by the reflecting wall of said channel and the intensity of the beam passing therethrough.
Claim 5
Dependent Claim
81 words
The combination as set forth in claim 1 wHerein said instrument is an infra-red gas analyzing instrument which includes a beam splitter including said radiation channels, said channels intersecting therein, for splitting radiation from the radiation source into two beams for respective passage through said channels, said surface of variable reflectivity being disposed in a plane of intersection of said radiation channels in said beam splitter and including a non-reflective planar portion disposed adjacent said reflective portion for absorbing incident radiation.
Claim 6
Dependent Claim
79 words
The combination as set forth in claim 1 wherein said wall of said one channel includes a window therein for transmission of radiation therethrough, said surface of variable reflectivity being disposed on an adjustably movable body in said wall behind said window and including a non-reflective planar portion disposed adjacent said reflective portion for absorbing incident radiation for adjusting the amount of radiation reflected by the reflecting wall of said channel and the intensity of the beam passing therethrough.
Claim 7
Dependent Claim
25 words
The combination as set forth in claim 5 wherein said body is metal and has said reflective and non-reflective portions of said surface disposed thereon.
Claim 8
Dependent Claim
20 words
The combination as set forth in claim 6 wherein said metal body is a disc rotatably mounted behind said window.
Claim 9
Dependent Claim
33 words
The combination as set forth in claim 6 wherein said metal body is a band and said non-reflective portion is wedge-shaped, said band being mounted so as to be displaceable behind said window.
Claim 10
Dependent Claim
25 words
The combination as set forth in claim 6 which further includes a motor having a reduction gear connected to said body for moving said body.
Claim 11
Dependent Claim
99 words
The combination as set forth in claim 1 wherein one of said walls of said channels includes a window therein for transmission of radiation therethrough and wherein said surface is disposed on a first sector diaphragm mounted in said wall behind said channel window, and a second sector diaphragm mounted adjacent to said first sector diaphragm, each of said diaphragms having said reflective surface portion disposed thereon and being movable relative to each other for adjusting the amount of radiation transmitted through said window and thereby varying the amount of radiation reflected by the reflecting wall of said channel.
Claim 12
Dependent Claim
41 words
The combination as set forth in claim 10 wherein said second sector diaphgram is rotatable through a predetermined angle relative to said first sector diaphragm and which further includes a pair of stops for limiting rotation of said second sector diaphragm.
Claim 13
Dependent Claim
20 words
The combination as set forth in claim 11 which further includes a rotating magnet for rotating said second sector diaphragm.
References Cited (Backward Citations)
US2754424A
Cited
US3105147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |