Spectrophone-dilution tube

Engine Exhaust Measurements. Automobile exhaust, sampled from the dilution tube, was studied using the spectrophone and the 514.5nm line of an Ar ion laser. 

The coupled spectrophone-dilution tube was first used to determine the absorption coefficient of airborne exhaust soot from a 2.4 liter Mercedes Diesel vs. NO2 as a standard (8). The value was found to be (5.5 1.0)m2g 1 at 514.5nm. (The automobile was run on a vehicle dynamometer at a cruise speed of 55 mph, with an average particulate concentration of 0.050 g m 3.)... 

Figure 2. Spectrophone response as a function of laser output power for exhaust from a 2.4-L Mercedes diesel taken from a dilution tube...

Figure 3. Spectrophone response to exhaust particulate jrom a 5.8-L Cougar PROCO and a 2.4-L Mercedes diesel (with a 55 mph cruise) run through a portion of the Federal Test procedure on a vehicle dynamometer. Dilution tube—300 CFM, 35°C modulation frequency—3985 Hz lazer—Ar (514.5 nm).

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