Laser Particle Counter and Laser SpectrometerDifferences between Laser Spectrometers and Laser Particle Counters
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Laser Particle Counter
A laser particle counter was designed with laser light tubes in the 1990 time frame, but has since began using solid state lasers for the advantage of power. The same advantages and dis-advantages for laser diodes and laser tubes are applicable with a laser particle counter. The number os size bins and the level of particle size resolution is significantly less than with a aerosol particle spectrometer. As laser diode power has increased, particle size detection sensitivity began to drop from 1 micron to 100 nano-meters (NM), then down to 50 nm, more recently going to 10 nm and now down in the size range of 3-5 nm. In addition, the laser particle counter has shrunk in size from large desk top units down to portable, hand held laser particle counters. The larger versions of the LPC offer higher size resolution and more data bins; while the handheld portable laser particle counters offer a very small package, battery operation; but with few size bins and poor size resolution. Airflow control is important, but is not well controlled in portable laser particle counters. Yet, the industry makes use of the portable LPC being used more as a portable monitor.