Aerosol Instrumentation >> Droplet Measurement Technologies

Back-scatter Cloud Probe (BCP)

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    The instrument’s non-intrusive housing allows it to measure cloud particles with minimal airflow disruption.

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      Back-scattering optics detect particles in the 7 – 75 µm range. Particles passing through the laser beam scatter light in all directions. Some of this light transmits within a cone with subtending angles between 143° and 169° (156° ± 13°). These photons are directed onto a photo detector that converts their pulses into electrical pulses, which are then transmitted to a signal processor that amplifies and digitizes them. Mie theory is used to determine the particle’s size from the peak amplitude of the scattering signal. At programmable intervals, the BCP sends out a particle size distribution. This information is then used to determine particle number concentration.