Sistema embarcado para monitoramento de particulados de carbono em emissões de motores do ciclo diesel.

Abstract

The monitoring of carbon particulate levels in diesel cycle engines is imperative due to the fact that high concentrations of this type of emission could cause severe damage in health and environment. This work describes an instrumentation system development for monitoring carbon particulate concentration. The detection principle is based on extinction and scattering of a light provided by a light source (laser) caused by an exhaust smoke collected by a sample tube. The measure of particulate concentration uses opacimetry (light extinction), that an optical sensor is positioned in front of light source. The light scattering measurement is achieved by tree optical sensors positioned in different angles.The Intensity of scattered light in each angle could reveal particulate composition properties.The characterization system uses a diesel engine of a 150KW generator group and an exhaust gas sample is canalized to the analysis chamber, where the light source and the optical sensor are placed. The readings of each sensor and laser bight control are realized by the data acquisition system microcontroller. The values of the readings are processed and shared to a data storage system (PC) or a control system via RS232 serial connection.