Patent ID: 11913969
Assignee: ENDRESS+HAUSER SE+CO. KG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for calibrating a radiometric device for determining and/or monitoring the density of a medium within a container, the method comprising:
providing:
a transmitting unit configured to emit radioactive radiation of a predefined intensity;
a receiving unit configured to receive the radiation emitted by the transmitting unit after the radiation has passed through the medium; and
a control/evaluation unit configured to determine a density of the medium within the container based on a radiation intensity measured by the receiving unit;

determining a count rate of the radiation after passing through the container when empty based on an activity of the transmitting unit;
determining a count rate of the radiation after passing through the container when a calibration medium of known density is within the container;
determining a mass attenuation coefficient defined as:

μ=−(ln(N/N0))/(ρ1D),

wherein D is a beam path of the radiation or an inner dimension of the container, ρ1 is the density of the calibration medium, N0 is the count rate of the measured radiation after passing through the empty container, and N is the count rate of the measured radiation after passing through the calibration medium; and
calculating a calibration curve representing a dependence of the density of the medium on the count rate of the measured radiation intensity after the radiation has passed through the container.