Abstract
A photo-electric technique is described for instant determination of contaminant concentration in wind tunnel studies of stack gas dispersion. In the method, a roving sensor is used to measure the light scattered by the particles of oil aerosol representing the prototype stack effluent. The miniature probe has a noise level of only 1 × 10 −5 of the full linear range of the output signal for a time constant of 5 s. However, the device is also suitable for the measurement of fluctuating flow properties, such as turbulence, where a high frequency response is required.
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