aerosol photometer response time constant time reading to reach 63% final value

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Photometer Response Time Constant

The time for the photometer reading to reach 63% of its final value when there is step change in aerosol concentration at the probe inlet( i.e., the time constant of the exponential response of the photometer). Te response time is a function of the photometer design, the photometer scale used (full scale equals 0.1%) and the sampling system