US4094609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High sensitivity absorptiometer
Assignee: Hitachi Ltd
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Filing: 1977-02-11
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Granted: 1978-06-13
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Expires: 1997-02-11
Abstract
Abstract A high sensitivity absorptiometer comprises a light source lamp accompanied inevitably with heat generation, a sample container through which the light from the light source is transmitted and a detector device for detecting the light which has transmitted through the sample container. The light emitted from the light source lamp and directed to the sample container is adapted to pass through a chamber which is formed fluid-tight on a surface portion of the light source lamp or through a solid state optical conductor such as optical fiber having a light inlet end face closely fitted to the surface portion of the lamp, thereby to suppress movement and turbulence of air as caused by heat generated by the light source lamp with a view to excluding noise and drift ascribable to the air movement or turbulence phenomenon from the signal obtained from the detector device.
Inventors
- 👤 Yoshio Fujii
- 👤 Mitsuo Shimada
- 👤 Sadabumi Ohnuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:49
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/02; G01J3/0286; G01J3/10; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/255
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
98 words
A high sensitivity absorptiometer comprising a light source lamp with an inevitable heat generation, sample containing means through which light from said light source lamp transmits, detecting means for detecting the light transmitted through said sample accommodating means, and a chamber formed by at least a surface portion of said light source lamp and an enclosing wall member fitted tightly to said surface so that said chamber is inhibited from fluid communication with the exterior, wherein said light emitted from said light source lamp and directed to said sample containing means is caused to pass through said chamber.
Claim 2
Dependent Claim
98 words
A high sensitivity absorptiometer comprising a light source lamp with an inevitable heat generation, sample containing means through which light from said light source lamp transmits, detecting means for detecting the light transmitted through said sample accommodating means, and a chamber formed by at least a surface portion of said light source lamp and an enclosing wall member fitted tightly to said surface so that said chamber is inhibited from fluid communication with the exterior, wherein said light emitted from said light source lamp and directed to said sample containing means is caused to pass through said chamber.
Claim 3
Dependent Claim
43 words
An absorptiometer as set forth in claim 1, wherein said chamber is formed by a surface portion of said light source lamp, an enclosing wall member tightly fitted to said surface and a light collecting lens mounted fluid-tight onto said enclosing wall member.
Claim 4
Dependent Claim
45 words
An absorptiometer as set forth in claim 1, wherein said chamber is formed by a surface portion of said light source lamp, an enclosing wall member closely fitted to said surface portion, and a light transmissive heat-shield member mounted fluid-tightly on said enclosing wall member.
Claim 5
Dependent Claim
23 words
An absorptiometer is set forth in claim 1, wherein said enclosing wall member is made of a material having a high thermal conductivity.
Claim 6
Dependent Claim
79 words
An absorptiometer as set forth in claim 1, wherein a plurality of chambers are provided between said light source lamp and said sample containing means, each of said chambers being enclosed by said enclosing wall member and partitioned from one another by light transmissive members so that said chambers are inhibited from fluid communication with ambient exterior, and wherein said light emitted by said light source lamp is guided to said sample containing means through said partitioned individual chambers.
Claim 7
Dependent Claim
24 words
An absorptiometer as set forth in claim 5, wherein at least one of said light tansmissive members is composed of a heat shielding element.
Claim 8
Dependent Claim
31 words
An absorptiometer as set forth in claim 5, wherein a space between said sample containing means and said detecting means is defined by a chamber closed fluid-tight from the ambient exterior.
Claim 9
Dependent Claim
18 words
An absorptiometer as set forth in claim 1, wherein said chamber is accommodated within a fluid-tight closed chamber.
Claim 10
Dependent Claim
23 words
An absorptiometer as set forth in claim 1, wherein said chamber and said sample containing means are housed within a fluid-tight closed chamber.
Claim 11
Dependent Claim
30 words
An absorptiometer as set forth in claim 1, wherein said chamber is housed within a first fluid-tight chamber and said sample containing means is housed within a second fluid-tight chamber.
Claim 12
Dependent Claim
21 words
An absorptiometer as set forth in claim 7, wherein all of said chambers are housed within at least one fluid-tight chamber.
Claim 13
Dependent Claim
21 words
An absorptiometer as set forth in claim 1, wherein said chamber is maintained at a lower pressure than the atmospheric pressure.
Claim 14
Dependent Claim
18 words
An absorptiometer as set forth in claim 1, including means for maintaining said chamber at a constant temperature.
Claim 15
Dependent Claim
19 words
An absorptiometer as set forth in claim 1, wherein said sample containing means is composed of a flow cell.
Claim 16
Dependent Claim
36 words
An absorptiometer as set forth in claim 1, wherein a pipe through which a liquid to be detected passes is thermally conductively contacted to a member which is thermally conductively coupled to said sample containing means.
Claim 17
Dependent Claim
20 words
An absorptiometer as set forth in claim 14, wherein said absorptiometer is used as a detector for a liquid chromatography.
Claim 18
Dependent Claim
78 words
A high sensitivity absorptiometer comprising a light source lamp with an inevitable heat generation, sample containing means through which light from said light source lamp is caused to pass, an optical fiber having a light input end face positioned in contact with a surface portion of said light source lamp and serving to guide the light from said light source lamp to said sample containing means, and detecting means for detecting light transmitted through said sample containing means.
Claim 19
Dependent Claim
78 words
A high sensitivity absorptiometer comprising a light source lamp with an inevitable heat generation, sample containing means through which light from said light source lamp is caused to pass, an optical fiber having a light input end face positioned in contact with a surface portion of said light source lamp and serving to guide the light from said light source lamp to said sample containing means, and detecting means for detecting light transmitted through said sample containing means.
Claim 20
Dependent Claim
94 words
A high sensitivity absorptiometer comprising a light source lamp with an inevitable heat generation, sample containing means through which light emitted from said light source lamp is caused to pass, detecting means for detecting light transmitted through said sample containing means, an optical fiber for guiding the light from said light source lamp to said sample containing means, and a fluid-tight chamber formed by at least a surface portion of said light source lamp, an enclosing wall member closely fitted to said surface portion and a light input end face of said optical fiber.
Claim 21
Dependent Claim
94 words
A high sensitivity absorptiometer comprising a light source lamp with an inevitable heat generation, sample containing means through which light emitted from said light source lamp is caused to pass, detecting means for detecting light transmitted through said sample containing means, an optical fiber for guiding the light from said light source lamp to said sample containing means, and a fluid-tight chamber formed by at least a surface portion of said light source lamp, an enclosing wall member closely fitted to said surface portion and a light input end face of said optical fiber.
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) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |