摘要:
A probe for the non-contact measurement of electric or magnetic field strengths has two wave guides provided on a substrate. One of the wave guides has a measurement portion consisting of an electro-optical material or a magneto-optical material in a region of a measurement zone. A magnetic or electric field changes the index of refraction of the measuring portion and the intensity of a light wave traveling through this portion of the wave guide is reduced. Comparison is then made between a standard intensity in the other wave guide and a reduced intensity in the light traveling through the wave guide measuring portion.
摘要:
A method of manufacturing a preform from which glass fibers are to be drawn including making a groove in a first cladding glass element, filling the groove with core glass, grinding or otherwise finishing the surface of the cladding element and the core glass to a flat surface and optically contacting a second cladding glass element to the finished surface of said first cladding glass element thereby covering the core glass material.
摘要:
A process for the preparation of recyclate polyols obtained by glycolysis of polyurethanes and/or polyurea-polyurethanes comprises metering in monofunctional and/or difunctional glycidyl ethers over the entire course of the reaction; the low-amine recyclate polyols obtained in this way are used for the preparation of cellular or noncellular polyurethanes.
摘要:
Magnetically stored data, for example data stored on a magnetic tape is converted directly into optical signals by an arrangement which comprises a magneto-optical modulator and a wave guide laser. The wave guide laser has an index of refraction n.sub.2 and is arranged on a transparent substrate which has an index of refraction n.sub.3 by epitaxial growth. The magneto-optical modulator has an index of refraction n.sub.1 and is applied as an epitaxial growth to the wave guide laser. The indices of refraction fulfill the condition that n.sub.1 > n.sub.2 > n.sub.3.