Manual, Ultra High Sensitivity Aerosol Spectrometer (UHSAS)
DOC-0210 Rev E-4
2 7
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
instrument is 1054 nm, it is expected that all particles below approximately 300 nm will lie on a
sixth-power curve—that is, the particle signal is a sixth-power of the particle size. This has been
hard-coded into the instrument by forcing the signals from G3, G2 and G1 to fall on a sixth-
power curve. The final gain stage, G0, used for particles from 300 to 1000 nm, has a Mie curve
appropriate for the scattering response of the instrument (see Figure 16). It is a complicated
function which is calculated and confirmed by test particle measurements. In the event that the
user has a preferred curve, empirical or theoretical, this curve can be entered instead.
Figure 16: Example Calibration Curve
