Installation Manual

Title: Installation Specifications and User Manual, Radar
Sensors
Doc. No. E567781
INSTALLATION SPECIFICATION Rev. 001, Page 10 of 14
5.0 SPECIFICATIONS
5.3 Installation Specifications For Individual Sensors
(cont’d)
5.3.7 Protection From Mud And Dirt Buildup
There will be performance degradation if excessive buildup occurs on
the antenna areas and especially for wet mud. Therefore Autoliv
strongly recommends the sensor mounting include provisions to protect
the antenna face from dirt and mud accumulation. The mounting
concept should prevent mud and dirt from entering the free space
between the sensor radome and the fascia. In addition the protection
features must not interfere with the antenna areas as described in
5.2.2 – 5.2.3.
In order to minimize any possible influence the protection feature might
have on the RF performance of the sensor it is recommended that the
material thickness and dielectric constant be controlled to minimize the
reflectivity of the material. Autoliv can characterize material samples
and provide a recommended thickness. The thickness and dielectric
constant must be controlled to a ±10% tolerance.
5.3.8 Sensor mounting thermal considerations
The sensor is specified to operate in a –40° to +85°C ambient, still air
environment. Natural convection and venting from the front and
backside surfaces of the sensor to the ambient air is assumed.
Therefore the mounting concept shall leave both the front radome and
backside area of the sensor exposed to the ambient air. Minimum area
to be left for the backside exposed is as shown below. Maximum
surface temperature in this region is +115°C at a maximum ambient of
+85°C.
Figure 7