Optical Particle Counter OPC
Purpose of Participation
- Airborne in-situ total aerosol number density of the accumulation mode aerosol > 0.26 µm in close to dry state
- Airborne in-situ aerosol size distribution between 0.26 and 2.2 µm
Instrument description
The OPC (GRIMM, model 7.309) 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 0.26 and 2.2 µm up to 2000 pp*cm-3 |
| Altitude range | 0 - aircraft max altitude |
| Vertical resolution | Depends or ascend and descend velocity |
| Temporal resolution | 1 sec |
| 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