NF goniometer

Description

In 2010 the light and lighting laboratory purchased three near field photogoniometers with financial support of the Hercules foundation. This goniometers allow the measurement of the luminous intensity pattern, luminous flux and complete ray data sets of all kinds of light sources with dimensions from a couple of mm to 1.8 m. The goniometers are equipped with three sensors: a photo meter, a luminance camera and a spectrometer. The sensors rotate at a short distance around the fixed test object. The classic ‘far field intensity distribution’ is derived from the measured ‘near field intensity distribution’.

Possibilities

  • Determination of the intensity pattern with an angle resolution of 0.1°x0.1°
  • Determination of luminous flux (lm)
  • Measurement of a ray data set
  • Measurement of the spectrum of the light source
  • Determination of colour coordinates, correlated colour temperature (CCT) and CRI

Calibration source

  • LMT calibration source (PTB, Germany): calibrated for the luminous flux

Norms

  • CIE 121-1996 The Photometry and Goniophotometry of Luminaires
  • CIE 15-2004 Photometry
  • TC2-62 Imaging-photometer-based near-field goniophotometry (draftversie)
  • EN 13032-1: Light and lighting - measurement and presentation of photometric data of lamps and luminaires - part 1: Measurement and file format
  • EN 13032-2: Light and lighting - measurement and presentation of photometric data of lamps and luminaires - part 2: Presentation of data for indoor and outdoor work places
  • CIE 15 "Colorimetry"
  • CIE 63 "The spectroradiometric measurement of light sources"
  • IES LM-79 "Electrical and Photometric measurement of solid-state lighting Products"

Links

  • General information on the three photogoniometers
  • Video of the large Near Field photogoniometer
  • Video of the small and medium sized Near Field photogonioeter and the measurement of a ray data set
Small NF goniometer
Medium sized NF goniometer
Large NF goniometer