MIXING TYPE CONDENSATION NUCLEI METER

A condensation nuclei meter for deriving a count of the condensation nuclei particles entrained in a sample atmosphere. The meter comprises a condensation chamber having a light source and photocell disposed at opposite ends for projecting a light beam through the condensation chamber and deriving an output electric signal from the photocell which is representative of the light modifying effects on the light beam of liquid droplets formed in the condensation chamber. A first filtered gas at a first temperature value and 100 percent relative humidity is introduced in the condensation chamber with the condensation chamber maintained at the first temperature value. A second condensation nuclei particle bearing sample gas to be monitored is then introduced at a second temperature value different from the first temperature and at 100 percent relative humidity at the second temperature. The second gas is rapidly injected and turbulantly intermixed with the first gas within the condensation chamber in a manner to assure rapid mixing at the confluence of the two gases whereby supersaturation occurs and condensation takes place about the condensation nuclei particles as centers of condensation.