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Optical Particle Counter OPC
Purpose of Participation
- Airborne in-situ total aerosol number density of the accumulation mode aerosol > 0.35 µm in close to dry state
- Ground based aerosol size distribution between 0.35 and 6.5 µm
Instrument description
The airborne OPC (GRIMM, model 7.309) delivers single particle counts and size classification based on aerosol scattering properties in a real time.
The ground-based OPC (GRIMM, model 1.106) delivers single particle counts and size classification based on aerosol scattering properties in a real time.
| Species | Aerosols |
| Method | Direct concentration measurements |
| Quantity primary | Aerosol number concentration/Aerosol size distribution |
| Quantity secondary | |
| Measurement range | Particles between 0.35 and 6.5 µm up to 2000 cm -3 |
| Altitude range | NA |
| Vertical resolution | NA |
| Temporal resolution | 1 minute |
| Operation | Cabin T > 0°C |
| Precision | Depends on aerosol concentration, reproducibility ±3% |
| Preliminary data | in principle next day (man power dependent) |
| Final data | one year |
Specific remarks
- Ambient p and T from POLAR 4 basic instrumentation are required to derive ambient concentrations
References
GRIMM Aerosol Technik GmbH &Co.KG