Ethernet Sky Quality Meter with Lens (SQM-LE)


Een ethernet-enabled SQM-model voor het bewaken van de nachtelijke hemelhelderheid!

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Sky Quality Meter
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Ethernet Sky Quality Meter with Lens (SQM-LE)

Een ethernet-enabled SQM-model voor het bewaken van de nachtelijke hemelhelderheid! Een betaalbare meter voor continue, geconnecteerde meting van de hemelhelderheid voor astronomen! De “Sky Quality Meter – LE” meet de helderheid van de nachtelijke hemel in magnitudes per vierkante boogseconde


  • Find out how good the night or site REALLY is.
  • Compare the sky brightness at different sites quantitatively.
  • Document the evolution of light pollution in your area.
  • Set planetarium dome illumination to mimic the skies people are likely to experience elsewhere in the city.
  • Monitor sky brightness through the night, night-to-night, and year-to-year.
  • Determine which nights show the greatest promise for finding the ‘faintest fuzzies’!
  • Calibrate the effect of sky brightness on qualitative measures such as the Bortle Scale.
  • Investigate how sky brightness correlates with the solar cycle and month-to-month sunspot activity.
  • Help provide local ground truth for future sky brightness prediction with the Clear Sky Clock.
  • CCD users can make a correlation between the SQM reading and when the background reaches some ADC level.


  • Sky brightness reported in visual magnitudes per square arcsecond.
  • Infrared blocking filter restricts measurement to visual bandpass.
  • Sensor temperature, model number, and serial number are provided.
  • Precision readings at even the darkest sites.
  • Field-upgradeable firmware
  • Open protocol document

Specificaties van de Ethernet Sky Quality Meter with Lens (SQM-LE) zijn:

  • Ethernet connectivity
  • Included applications for reading data in Java, C, Perl, Python.
  • The Half Width Half Maximum (HWHM) of the angular sensitivity is ~10°. The Full Width Half Maximum (FWHM) is then ~20°.
  • The sensitivity to a point source ~19° off-axis is a factor of 10 lower than on-axis.
  •  A point source ~20° and ~40° off-axis would register 3.0 and 5.0 magnitudes fainter, respectively.
  • Operates from 5-6VDC adapter (included).
  • Size 3.6 x 2.6 x 1.1 in.
  • Maximum light sampling time: 80 seconds.
  • Minimum light sampling time: 1 seconds.
  • Specifications are subject to change without notice.

What you get:

  • SQM-LE unit
  • International Power adapter
  • SQM-LE users manual
  • CD with PDF manual and example software
  • 6ft Ethernet cable (straight through for connection to hub/router)
  • 6ft Ethernet crossover cable (for connection directly to PC)
  • Calibration sheet indicates unit MAC address, and calibration values


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Sky Quality Meter

2 jaar

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Sky Quality Meter

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