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A condensation particle counter or CPC is a particle counter that detects and counts aerosol particles by first enlarging them by using the particles as nucleation centers to create droplets in a supersaturated gas. [2] Three techniques have been used to produce nucleation: Adiabatic expansion using an expansion chamber.
The air now contains only particles of a certain diameter. The flow is introduced into a CPC, a condensation particle counter, which measures the concentration of particles in an aerosol sample. The CPC works by using butanol vapor condensation on the particles present in the air sample. The particles are exposed to butanol vapor heated to 39 °C.
Andersen's schematic for the six-stage Andersen sampler, detailing movement of air and hole sizes for the top two stages [1]. An Andersen sampler, Andersen impactor, or sieve impactor [2] is a cascade impactor used to determine the amount of viable pathogens in a given area, in particular bacteria and fungi.
The light blocking optical particle counter method is typically useful for detecting and sizing particles greater than 1 micrometre in size and is based upon the amount of light a particle blocks when passing through the detection area of the particle counter. This type of technique allows high resolution and reliable measurement.
Fig. 4: How condensation trails are formed in a diffusion cloud chamber. Fig. 5: In a diffusion cloud chamber, a 5.3 MeV alpha-particle track from a Pb-210 pin source near Point (1) undergoes Rutherford scattering near Point (2), deflecting by angle theta of about 30 degrees. It scatters once again near Point (3), and finally comes to rest in ...
HCT Co., Ltd. is a South Korean compliance testing and equipment calibration company that also develops particle counters and antennas. Founded in 2000 as Hyundai Calibration & Certification Technologies Co., the company is a spin-off from Hyundai Electronics, the world's second-largest memory chipmaker.
Typically, they are measured (or counted) with condensation particle counters, which effectively enlarge the particles by condensing vapors onto them to make bigger and much more easily detectable droplets. [36] [37] The atomic composition of particulate samples can be measured with techniques such as X-ray spectrometry. [38]
Cascade impactors are strictly measurement-related devices. In addition to measuring the range of substances moved through an opening by aerosol, the impactor can also be used to determine the particle size of the distributed substance. A cascade impactor collects its samples in a graduated manner.
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