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Instruments > In Situ/Laboratory Instruments > Spectrometers/Radiometers > POPS

Preferred term

POPS  

Definition

  • The Portable Optical Particle Spectrometer (POPS) was developed at the NOAA Chemical Sciences Laboratory (CSL) by Dr. Ru-Shan Gao and his team. The instrument is a robust, small, lightweight, low-power consumption, and relatively low-cost research grade instrument that reports particle size and number concentration of aerosols with diameters between 140 nm and 2.5 µm. This size range captures the bulk of accumulation mode aerosols, which can efficiently scatter light and often outnumber larger aerosols, thereby influencing radiative forcing and Earth's radiation budget. The instrument boasts single particle detection, a variable flow rate and specialized design features to ensure robust aerosol measurements at high altitude (low pressure). POPS measures the scattered light from a 405 nm (Blu-Ray) laser, each time a particle passes through the beam, and a calibrated Mie theory calculation is used to determine the particle size based on the intensity of scattered light. Like with other optical particle sizing instruments, the calculated size depends on the index of refraction and assumes that particles have a spherical shape. (en)

Broader concept

Change note

  • 2022-10-04 09:10:25.0 [tstevens] Insert Concept add broader relation (POPS [5b662d1c-b519-40bb-9dfc-da25e313e36c,1070169] - Spectrometers/Radiometers [ecd58f82-8f96-45e1-9547-dd4a02291bd9,1062590]);
  • 2022-10-04 09:11:30.0 [tstevens] insert AltLabel (id: null category: primary text: Printed Optical Portable Spectrometer language code: en); insert Definition (id: null text: The Portable Optical Particle Spectrometer (POPS) was developed at the NOAA Chemical Sciences Laboratory (CSL) by Dr. Ru-Shan Gao and his team. The instrument is a robust, small, lightweight, low-power consumption, and relatively low-cost research grade instrument that reports particle size and number concentration of aerosols with diameters between 140 nm and 2.5 µm. This size range captures the bulk of accumulation mode aerosols, which can efficiently scatter light and often outnumber larger aerosols, thereby influencing radiative forcing and Earth's radiation budget. The instrument boasts single particle detection, a variable flow rate and specialized design features to ensure robust aerosol measurements at high altitude (low pressure). POPS measures the scattered light from a 405 nm (Blu-Ray) laser, each time a particle passes through the beam, and a calibrated Mie theory calculation is used to determine the particle size based on the intensity of scattered light. Like with other optical particle sizing instruments, the calculated size depends on the index of refraction and assumes that particles have a spherical shape. language code: en);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/5b662d1c-b519-40bb-9dfc-da25e313e36c

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