FIELD: mechanical engineering.
SUBSTANCE: invention can be used for estimating contamination of diesel oil with particles of soot for replacement of oil in due time. Level of oil contamination is estimated by change of intensity of optical radiation passing through optical rod owing to complete internal reflection on interface of sensitive cylindrical surface - oil. Change of intensity is measured caused both by change of absorption in layer of penetration of radiation into oil and change of refraction index of oil at increase of concentration of soot particles in oil. Optical rod is made of optical material whose refraction index of which is greater than refraction index of engine oil under testing, ratio of length of rod to its diameter being not less than 10:1. first end face of rod square to optical axis is in contact with source and receiver of optical radiation, and second end face of rod square to optical axis is provided with reflecting mirror coating. Cleaning of sensitive surface of optical element is done by means of electrostatic field. Concentration of soot particles in oil is evaluated basing on change of measured signal relative to signal received at testing of clean oil with use of calibration relationship.
EFFECT: provision of high accuracy and reliability of evaluation of contamination of diesel oil with particles and replacement of contaminated oil in due time.
11 dwg
