Concept information
Preferred term
N-MASS
Definition
- N-MASS (Nucleation-Mode Aerosol Size Spectrometer) measures the concentration of particles as a function of diameter from approximately 4 to 60 nm. A sample flow is continuously extracted from the free stream using a decelerating inlet and is transported to the N-MASS. Within the instrument, the sample flow is carried to 5 parallel condensation nucleus counters (CNCs). Each CNC is tuned to measure the cumulative concentration of particles larger than certain diameter. The minimum detectable diameters for the 5 CNCs are 4.0, 7.5, 15, 30 and 55 nm, respectively. An inversion algorithm is applied to recover a continuous size distribution in the 4 to 60 nm diameter range. Additional information available at "http://www.engr.du.edu/aerosol/nmass.htm" (en)
Broader concept
- Spectrometers (en)
URI
https://gcmd.earthdata.nasa.gov/kms/concept/2ef354d6-de14-42f5-99ec-73fbc9dac4de
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