Function; Principle Of Operation - +Gf+ 2298 Bedienungsanleitung

Type 2298 80 GHz Radar Level Sensor
3.3

Function

3.3.1 Design
3.3.2

Principle of operation

The type 2298 is a continuous wave frequency modulated radar (FMCW) operating in the 80 GHz frequency band (W-band). Part of the
energy of the frequency modulated wave emitted by the transmitter's antenna is reflected from the measured surface, depending on
the properties of the measured material. The distance to the reflecting surface is calculated with high accuracy by the electronics
from the frequency shift of the reflected signal proportional to the propagation time and converted into a signal proportional to dis-
tance, level, or volume. The propagation velocity of the millimeter-wave signal in the air, gases, and vacuum is nearly constant, re-
gardless of temperature and pressure, so these factors do not significantly affect the accuracy of the measurement.
The signal strength of the reflected millimeter waves depends largely on the measured medium's relative dielectric constant (εr);
therefore, the maximum measurement distance that can be achieved in practice may be reduced. A larger diameter antenna with a
higher gain is recommended for measuring low dielectric constant media.
12
4
3
2
1
Instruction manual
Pos. Designation
1 Antenna
2 Process connection
3 Housing
4
Connecting cable