26 August 2004 Method of measurement of exhaust opacity of diesel vehicles and devices for its realization
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Proceedings Volume 5566, Optical Security and Safety; (2004) https://doi.org/10.1117/12.577113
Event: Optical Security and Safety, 2003, Warsaw, Poland
Abstract
The operation principle of now used smokemeters is based on the measurement of attenuation of optical radiation transmitted through a vehicle emission and additional measurement of quantity of a compensation optical flux. The instability of instrumental constants of emitting-receiving and recording units of a measuring system due to the changes in measurement conditions (temperature, optical surfaces pollution, background illumination, etc.) results in the necessity of correction (tuning) of zero value by calibration measurements. Often (in quickly changed conditions) the calibration is difficult or even impossible. The additional measurements of a compensation flux reduce only influence of instability in emitted light pulse power (energy) on the measurement accuracy and cannot reduce an influence of other factors. Proposed method of exhaust opacity determination and devices for its realization are intended for operative determination of mass concentration of soot in the emission of vehicles. We propose the system in which sending and recording of sounding radiation is carried out by two light emitters and two photoreceivers on two crossing directions in a scattering medium (emission). In addition the same two photoreceivers register optical fluxes scattered by the medium (in the area of crossing of sounding directions). Mass concentration of the soot in an emission is determined on the base of registered sounding light fluxes, scattered by the emission fluxes and past through the emission fluxes.
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Mikhail M. Kugeiko, Mikhail M. Kugeiko, Vladimir A. Firago, Vladimir A. Firago, Sergei N. Drozd, Sergei N. Drozd, } "Method of measurement of exhaust opacity of diesel vehicles and devices for its realization", Proc. SPIE 5566, Optical Security and Safety, (26 August 2004); doi: 10.1117/12.577113; https://doi.org/10.1117/12.577113
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