Dosimeter
AssigneeDragerwerk Aktiengesellschaft
InventorWolfgang Evers
Life of this patent
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Abstract
The invention relates to a dosimeter wherein the substances to be detected color a chemical sensor layer. The degree of coloration of the chemical sensor layer is measured by a photometric diffusion-reflectance measuring device. This dosimeter is improved with respect to a measurement occurring during the time that the contaminant substance is effective. The foregoing is accomplished with the dosimeter of the invention in that the dosimeter has a measuring chamber which receives a diffusion element and with a light impermeable wall portion which closes off the diffusion element while at the same time being permeable to the substance to be detected. A light source and a photosensor are arranged in the measuring chamber.
Claims10
A dosimeter for detecting the presence of a substance in the form of a gas or a vapor, the dosimeter comprising:
- a housing having a forward wall and a flat measuring chamber formed in said housing so as to have a rearward wall facing said forward wall;
- said forward wall having a wall portion for closing said chamber to the ambient;
- said wall portion being non-transparent to light and yet being permeable to said substance;
- an exchangeable diffusion member adapted to be removably insertable into said measuring chamber so as to be disposed rearwardly of said wall portion and including a chemically reacting sensor layer which changes color in the presence of said substance;
- said diffusion member being disposed in said chamber on said rearward wall so as to cause said sensor layer to face toward said wall portion;
- said diffusion member having first and second cutouts;
- and,
- a photometric diffusion-reflectance measuring device for measuring the degree of coloration in said sensing layer, the measuring device including:
- light source means disposed on said rearward wall of said measuring chamber and arranged in the region of said first cutout for irradiating light onto said sensor layer;
- and, a photosensor also disposed in said measuring chamber on said rearward wall and mounted in the region of said second cutout for receiving the light reflected from said sensor layer.
Dependencies are inferred from the claim text.