Optical counter

{
  "id": "MLC-T-MET-007705",
  "term": "Optical counter",
  "field": "Meteorology and atmospheric science",
  "definition": "An instrument that detects and counts airborne particles by measuring the light scattered or absorbed by individual particles as they pass through a sensing volume. It provides information on particle number concentration and size distribution. Optical counters are widely used for monitoring air quality, studying aerosols, and characterizing cloud condensation nuclei.",
  "url": "https://mlchart.com/terminology/meteorology/optical-counter/"
}