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UNIHEDRON SKY QUALITY METER - LR SQM-LR

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UNIHEDRON SKY QUALITY METER (SQM-LR) 20 DEGREE FIELD, MODEM CONNECTION (WIN/MAC/LIN) SQM-LR

Item No. 787-11010
Manuf. No. Unihedron SQM-LR

Eligible for Scope City Rewards at Check-out

Unihedron Sky Quality Meter - LR

The "Sky Quality Meter - LR" measures the brightness of the night sky in magnitudes per square arcsecond. It is an RS232 SQM model for night-time sky brightness monitoring. It is an affordable meter for continual, connected measuring of sky brightness for astronomers. This product was designed by Dr. Doug Welch and Anthony Tekatch Uses:

  • 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.
Deployment:
  • Legacy computer interface installations.
  • MODEM interface installations.
  • Simple electronic interface projects.
Features:
  • 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.
Specifications:
  • RS232 connectivity
  • Included applications for reading data in Perl.
  • The Half Width Half Maximum (HWHM) of the angular sensitivity is ~10 degree. The Full Width Half Maximum (FWHM) is then ~20. The sensitivity to a point source ~19 degree off-axis is a factor of 10 lower than on-axis. A point source ~20 degree and ~40 degree off-axis would register 3.0 and 5.0 magnitudes fainter, respectively.
  • 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-LR unit
  • SQM-LR users manual
  • CD with PDF manual and example software
  • 6ft RS232 straight through cable
  • International AC adapter
  • Calibration sheet indicates unit serial number, and calibration values


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