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Aagard; Roger L.
Richfield, MN
No. of patents:

Patent Number Title Of Patent Date Issued
4487206 Fiber optic pressure sensor with temperature compensation and reference December 11, 1984
An intravascular catheter tip fiber optic pressure sensor wherein a lens element at the end of the fiber optic collimates the light emanating from the fiber and directs the light in a column towards a closely spaced reflecting diaphragm. The diaphragm is pressure responsive and modulates
4322621 Folded path absorption cell gas sensor March 30, 1982
In an optical absorption gas sensor there is a practical problem of obtaining a sufficiently long optical path necessary to provide the required sensitivity within a compact space. In the present invention the path length can be multiplied to about 2 meters in a hemispheric like cham
4141621 Three layer waveguide for thin film lens fabrication February 27, 1979
In thin film optical systems including thin film optical waveguides, of such materials as Nb.sub.2 O.sub.5, it is desirable to fabricate thin film lenses. One of the types of lenses which can be made is the step-in-thickness type. This type of thin-film lens can be fabricated by plas

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