A description of the UK Meteorological Office CCN counter
Abstract
The chamber is a thermal gradient diffusion type with the upper plate at room temperature and the lower plate thermoelectrically cooled. The light from a 25W projector bulb is focused in a beam of approximations 1x3 mm in the central part of the chamber. The light scattered by drops is viewed in the forward direction (40 deg) by a microscope and a sensitive photodetector. Experiments were performed to relate the peak output from the photocell with the maximum number of drops in the beam recorded photographically. The microscope is used to check the calibration at low concentrations of CCN. The results of the experiments and the performance of the counter are reported.
- Publication:
-
The Third International Cloud Condensation Nuclei Workshop
- Pub Date:
- November 1981
- Bibcode:
- 1981clcn.work...33K
- Keywords:
-
- Cloud Chambers;
- Condensing;
- Ice Nuclei;
- Nucleation;
- Precipitation Particle Measurement;
- Airborne Equipment;
- Cloud Physics;
- Counters;
- Light Scattering;
- Nephanalysis;
- Optical Measuring Instruments;
- Temperature Gradients;
- Thermal Diffusion;
- Instrumentation and Photography