Installation
13
Operating Instructions Radiation sensors R3XX
3.2 Measurement distance
The laws of optics must be taken into account when measuring radiation.
Depending on the distance between the radiation sensors and the
measurement object there will be certain minimum measuring field
diameters – see distance ratio (technical data).
The sensor type that is needed in each case, with the appropriate focal
length, must be determined in accordance with the required measuring field
size at the measurement object and the possible measurement distance. In
order to avoid incorrect measurements, the measurement object must fill the
entire field of view of the sensor lens. The lens field of view must therefore
be no larger than the measurement object itself.
The temperature of a plastic plate with the dimensions 220 x 400 mm is to
be measured using a Type R 300 radiation sensor.
At what distance must the sensor be mounted?
The smallest edge of the plastic plate measures 220 mm in length. For a
measuring field diameter of 220 mm, the measuring field diagram for Type R
300 sensors (see also 1.4.1) gives rise to a measurement distance of
approximately 380 mm.
Therefore, the distance between the sensor and the measurement object
should be no more than 380 mm.
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