EP0074055A2
Expired / Lapsed
EP
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Fiber optic pressure sensor
Assignee: Honeywell Inc
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Filing: 1982-08-31
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Granted: —
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Expires: 2002-08-31
Abstract
Abstract A fiber optic pressure sensor apparatus, in particular an intravascular catheter tip fiber optic pressure sensor is disclosed, wherein a lens element (11) at the end of the fiber optic (13) collimates the light emanating from the fiber and directs the light in a column towards a closely spaced reflecting diaphragm (14). The diaphragm is pressure responsive and modulates the focal length of the lens-diaphragm-mirror combination.
Inventors
- 👤 Roger L. Aagard
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 09:08
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/0076; G01L9/0077; A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215; A61B5/02154
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
Fiber optic pressure sensor apparatus, in particular intravascular blood pressure catheter, comprising a light source, fiber optic means, a pressure responsive reflecting diaphragm and means for detecting the reflected lignt, characterized by light-collimating lens means (11, 11') at the end of the fiber optic means (13, 13') and positioned for directing a column of light to the pressure-deformable reflecting diaphragm (14, 14'), with said diaphragm when being un- . deformed reflecting maximum light back to said lens means and when being distorted by increasing pressure reflecting less of the light in a direction to fall on said lens means.
Claim 2
Dependent Claim
99 words
Fiber optic pressure sensor apparatus, in particular intravascular blood pressure catheter, comprising a light source, fiber optic means, a pressure responsive reflecting diaphragm and means for detecting the reflected lignt, characterized by light-collimating lens means (11, 11') at the end of the fiber optic means (13, 13') and positioned for directing a column of light to the pressure-deformable reflecting diaphragm (14, 14'), with said diaphragm when being un- . deformed reflecting maximum light back to said lens means and when being distorted by increasing pressure reflecting less of the light in a direction to fall on said lens means.
Claim 3
Dependent Claim
22 words
Sensor according to claim 1, characterized in that said fiber optic means comprises a transmit (13) and a return (13') optic fiber.
Claim 4
Dependent Claim
38 words
Sensor according to claim 1 or 2, character- ized in that the fiber optic means (13, 13') extends into a sensor tip (10, 10') including the pressure deformable diaphragm (14, 14') and the light-collimating lens means (11, 11').
Claim 5
Dependent Claim
32 words
Sensor according to claim 3, characterized in that said sensor tip (10, 10') is hollow and comprises a sealed air chamber between said diaphragm (14, 14') and said lens means (11, 11').
Claim 6
Dependent Claim
27 words
Sensor according to claim 4, characterized by an air passage (16) through said lens means (11) so that ambient atmospheric pressure can be communicated to said chamber.
References Cited (Backward Citations)
No citation records indexed.
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