2. Product overview
Figure 2-1. CS140 Background Luminance sensor
The CS140 Background Luminance Sensor provides the luminance data required to assess the
visibility range for lights such as runway lights or warning lights. It accurately measures
background luminance over a wide range from 0 cd/m
2
, to a maximum of 45,000 cd/m
2
. The
CS140 uses a photodiode with a spectral response close to the CIE human eye model and
removes any unwanted wavelengths via an inbuilt band-pass filter.
The CS140 features a fixed 6˚ field of view as specified by the FAA. For easy installation, the CS140
is mounted horizontally with the required 6˚ inclination built into the design. (Other angles are
possible via the sensors mounting bracket.)
A heated hood will prevent ice and snow from building up, dew heaters will prevent
condensation on the glass window, and a dirty window detection system measures window
contamination.
The sensor is undamaged when pointed directly at the sun, allowing complete flexibility in
orientation. In addition, the sensor has a rugged IP66 rated environmental enclosure that
protects it from the harshest conditions and will measure the atmosphere with high stability and
repeatability.
3. Specifications
3.3 Communications specifications
3.4 Environmental specifications
CS140 Background Luminance Sensor
2
