Resources
Honeywell UPA150
- Current Status: Offline- Use Nanotrac
The Honeywell UPA150 is based on measurement of the velocities of particles in the size range of 3.2 nm to 6.4 µm undergoing Brownian motion in a liquid. This motion is detected by measuring the spectrum of Doppler-shifted photons from light scattered by the particles. Photons scattered from particles moving away from the scattering photon have their frequency lowered. A photon scattering from a particle moving towards it has its scattered frequency increased. The instrument uses homodyning to compare the shifted photons to unshifted photons, recording the difference or beat frequency of the interfering photons. This lowers the measured frequencies from 1015 cycles per second down to the audible range. The Brownian velocity of particles is inversely proportional to particle size and becomes quite significant if the particle dimensions are less than 1 µm. By measuring the spectrum of Doppler shifted frequencies, the particle velocity distribution and, hence, the particle size distribution can be determined.
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