Ceiling-height indicator

{
  "id": "MLC-T-MET-004213",
  "term": "Ceiling-height indicator",
  "field": "Meteorology and atmospheric science",
  "definition": "An instrument that projects a modulated beam of light vertically onto a cloud base and measures the height by analyzing the reflected signal. A detector, located a known distance from the projector, measures the angle of the reflected light spot to calculate the cloud base height via triangulation. Modern automated versions, known as ceilometers, use a pulsed laser and measure the travel time of the light pulse to determine the height.",
  "see_also": [
    "cloud-height indicator",
    "ceiling light",
    "ceilometer"
  ],
  "url": "https://mlchart.com/terminology/meteorology/ceiling-height-indicator/"
}