Patent ID: 8213013
Filing Date: 2012-07-03
Classification: A61B,G01N

Abstract:
1. A sensor for determining a concentration of a first substance found in a matrix, the matrix being a fluid matrix or a fluid-containing matrix, the sensor having: a measurement chamber, a transmitter for issuing optical radiation into the measurement chamber, a receiver for receiving optical radiation after the optical radiation has passed through the measurement chamber, and a control and evaluation circuit connected with the transmitter to turn the transmitter on, and connected with the receiver to read out a signal from the receiver, wherein the transmitter and the receiver are part of a wall of the measurement chamber, so that a unit formed in this manner is configured for introduction into the matrix, wherein the measurement chamber is filled with a measurement medium, wherein the wall of the measurement chamber is better diffusion-permeable for the first substance, at least in certain sections, than for remaining substances of the matrix, in order to balance out concentration differences of the first substance between the measurement medium and the matrix, and thus to separate the first substance from the remaining substances of the matrix, and wherein the control and evaluation circuit determines the concentration of the first substance in the matrix from the signal from the receiver.