Sensor arrangement for determining turbidity

A sensor arrangement for determining a turbidity of a liquid medium, comprising:

• a sensor section including at least one light source for sending transmission light into a measuring chamber, and at least one receiver associated with the light source for receiving reception light from the measuring chamber, wherein the transmission light is converted into the reception light in the measuring chamber by the medium due to scattering at a measurement angle, and the reception light received by the receiver is a measure of the turbidity of the medium,
• wherein the reception light is reflected at a reflection element, the reflection element in contact with the medium;
• and
• a solid angle filter arranged such that the light scattered by the medium and reflected by the reflection element is directed onto the receiver, wherein only light scattered at the measurement angle passes through the solid angle filter, and
• wherein the solid angle filter comprises a hollow cylinder having an inner diameter and a length, hollow cylinder structured to absorb at least a portion of the reception light and, due to the inner diameter and the length, to allow only the portion of the reception light that was scattered at the measurement angle to pass therethrough.

A sensor arrangement for determining a turbidity of a liquid medium, comprising:

• a sensor section including at least one light source for sending transmission light into a measuring chamber, and at least one receiver associated with the light source for receiving reception light from the measuring chamber, wherein the transmission light is converted into the reception light in the measuring chamber by the medium due to scattering at a measurement angle, and the reception light received by the receiver is a measure of the turbidity of the medium,
• wherein the reception light is reflected at a reflection element, the reflection element in contact with the medium;
• and
• a solid angle filter arranged such that the light scattered by the medium and reflected by the reflection element is directed onto the receiver, wherein only light scattered at the measurement angle passes through the solid angle filter, and
• wherein the solid angle filter comprises a block including a number of openings, each opening having an opening diameter and each opening being spaced from adjacent openings by a distance, the block structured to absorb at least a portion of the reception light and, due to the number of openings, the opening diameter of the openings and the distance of the openings from one another, to allow only the portion of the reception light that was scattered at the measurement angle to pass therethrough.