Dragerwerk Aktiengesellschaft

Dieter Pruss

Edmund Koch

Johannes Lagois

Werner Hagen

The invention is directed to a mirror arrangement for a beam path in a multiple-reflection cell for measuring the absorption of light in a measuring gas. In the measuring arrangement, an entrance aperture is imaged on an exit aperture via an entrance aperture mirror, a field mirror and an exit aperture mirror. This arrangement is improved in that the astigmatism of the imaging error is considerably reduced. For this purpose, the form of the aperture mirrors is approximately defined by an ellipsoid wherein the focal point spacing is approximately equal to half the distance between the entrance aperture and the exit aperture.

Mirror arrangement for a beam path in a multiple-reflection measuring

A radiation source for infrared radiation includes an area radiator and a resistance layer which are arranged on a support substrate. The heat capacity of the radiation source is to be reduced to the extent that a modulation of the intensity of the radiation source with sufficiently high frequencies is made possible. To this end it is provided that the resistance layer is disposed in a thinned region of the support substrate.

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Lubeck, Germany

Dieter Pruss