Inverse Multi-Angle Polarization Polarimeter With GRASP Data Retrieval

The IMAP 100

The Inverse Multi-Angle Polarization Polarimeter  (IMAP) measures scattering by particles as a function of

  • Scattering angle
  • Wavelength
  • Linear polarization

Each measurement type above  is made in up to 4 distinct size-bins from PM1 to PM10. Using the GRASP data retrieval software the IMAP will produce

  • A complete size distribution of the the measured particles every two minutes
  • Particle mass
  • The real refractive index of the particles for each size distribution

IMAP Specifications

Angular ranges measured: 8

View angles centered at 5 °, 10.5 °,31.8°, 63.5°, 95.3°, 116.5°, 148.2°, 169.4°
Instantaneous field of view ~ 2°

Wavelengths: 3
470 nm, 529 nm and 621 nm

Polarization orientations: 2
Parallel and perpendicular to the scattering plane

Size measurements:
4 size bins ranging from PM1 to PM10

IMAP Data Sheet.pdf

Instrument size: 25 cm x 44 cm x 30cm                          
Inlet height: 117 cm
Flow rate: 1.5 to 12 liters per minute
Data: Saved to an SD card.  Real time data access via USB, RS485, RS232
Remote Access via Wifi or Cell Network: AirPhoton Com 100 module (not included)
Calibration: Operational daily provided by clean air reference
Gas calibration: CO2 and clean air every 3 – 6 months depending on operating conditions
Power: Mains AC power. 120- or 240-Volt systems (50 and 60Hz).   60 W maximum load.  
A 5-Amp circuit breaker is included that also acts as the on-off switch.
Minimal Scattering Coefficient < 1E-7  Mm-1   (For any particle size)
Maximum Scattering Coefficient can be adjusted by reducing integration time.  Typically
Between 2E –3 Mm -1 to 2E-2 Mm -1 are achievable by tuning the settings to your application

Frequently Asked Questions

Yes the instrument can be connected to manifolds. The instrument can also operate without the cyclone if that is a concern for the user.

The active flow rate of the instrument is limited by its internal blower (fan). If the user wants a flow rate outside the range of our blower, the user can always use an external pump or blower.

Yes, the instrument can run at lower pressure. Pressure correction may be needed for the aerodynamic behavior of the cyclone or for Rayleigh scattering considerations.