Browse Prior Art Database

Single Unit Cassegrain Window for Electrochemical Electrodes

IP.com Disclosure Number: IPCOM000109092D
Original Publication Date: 1992-Jul-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Seki, H: AUTHOR

Abstract

A design for high collection efficiency optics for surface Raman spectroscopy was disclosed in (*). This consisted of a special Cassegrain lens which collected light scattered at high scattering angles. When this is used to examine the electrode in an EC (electrochemical) cell it is necessary to use a hemispherical window to collect the high scattering angle Raman light as shown in Fig. 1 which is a cross section of the Cassegrain lens and the EC cell with the electrode pushed up against the spherical window. It is proposed that the window to the electrochemical cell and the Cassegrain lens be combined into a single unit. The structure consists of two quartz pieces, the Cassegrain lens part and a flat slab, which are joined using a refractive index matching adhesive.

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Single Unit Cassegrain Window for Electrochemical Electrodes

       A design for high collection efficiency optics for
surface Raman spectroscopy was disclosed in (*).  This consisted of a
special Cassegrain lens which collected light scattered at high
scattering angles.  When this is used to examine the electrode in an
EC (electrochemical) cell it is necessary to use a hemispherical
window to collect the high scattering angle Raman light as shown in
Fig. 1 which is a cross section of the Cassegrain lens and the EC
cell with the electrode pushed up against the spherical window.  It
is proposed that the window to the electrochemical cell and the
Cassegrain lens be combined into a single unit.  The structure
consists of two quartz pieces, the Cassegrain lens part and a flat
slab, which are joined using a refractive index matching adhesive.
The unit is made of two pieces to facilitate the fabrication.  The
cross section of such a lens-window unit is shown in Fig. 2.  The top
portion is the Cassegrain lens in which the optical media is quartz
instead of air as it usually is.  The outer curved surface forms the
ellipsoidal mirror with its two focal point at F1 and F2.  The inner
curved surface is a paraboloid with its focal point at F1.  Both
curved surfaces are silvered and covered with a protective overcoat.
The flat areas are not silvered.  The lower piece is a slab with
parallel surfaces with the thickness set at a few microns thinner
than (F1 - F2).  Two sma...