Gas e.g. nitrogen dioxide, sensor system, has scattered light sensor that is arranged such that radiation emitted by infrared emitter is scattered in absorption path at particles to be detected and is detected by scattered light sensor

摘要

The system has an operating- and evaluating circuit (20) for operating the sensor system, and a surface ionization sensor with an infrared emitter (12) for ionization of gases to be detected. A scattered light sensor (11) is arranged such that radiation emitted by the infrared emitter is scattered in an absorption path (14) at particles to be detected and is detected by the scattered light sensor. An infrared sensor (18) is arranged opposite to the infrared emitter at the absorption path.