Endress+Hauser Micropilot FMR60 - Page 26

DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFTDRAFT DRAFT DRAFT
Micropilot FMR60
26 V. 4, Rev. 2, 19-03-2018 Endress+Hauser
Avoiding interference echoes
α
A0031813
Metal deflection plates installed at an angle to scatter the radar signals help prevent interference
echoes.
Optimization options
• Antenna size
The larger the antenna the smaller the beam angle α,resulting in fewer interference echoes
→  26.
• Mapping
Measurement can be optimized by electronically suppressing interference echoes.
Beam angle
D
W
D
_
=
2
2
. .
tan
W
α
α
A0031824
 9 Relationship between beam angle α, distance D and beamwidth diameter W
The beam angle is defined as the angle α where the energy density of the radar waves reaches half
the value of the maximum energy density (3dB width). Microwaves are also emitted outside the
signal beam and can be reflected off interfering installations.