The Goniophotometer – Centerpiece of a photometric laboratory

The luminous intensity distribution describes a fundamental characteristic of luminaires. A goniophotometer is generally used to measure this property. The setup comprises a mechanical goniophotometer with a horizontal and vertical axis for rotating the test sample and a photometer for measuring the luminous intensity over a given distance.

The goniophotometers of the AMS series are the Optronic Line core products and subject to continuous improvements.

A unique attribute of this product line are the on-the-fly measurement scans that are possible with the fast DSP 10 Photometer. The adaptive filtering of the preamplifier also permits measurement of pulse-modulated LED light sources. The goniophotometers are configured individually with further accessories, additional test setups, tristimulus colorimeters, retroreflectometers, and power supplies.

The Goniophotometers at a glance

ModelCIE TypeApplicationFeaturesSample sizeSample weight
AMS 200ASmall lamps and modules Cost-effective system with 2 axes< 700 mm8 kg
AMS 3000AUniversal for automotive headlamps and signal lamps5 axes (xyz sample positioning)< 1200 mm20 kg
AMS 5000AUniversal for large and heavy test samples (automotive headlamps, signal lamps, navigation aids)5 axes (xyz sample positioning)< 1800 mm50 kg
AMS 9000BVariable message signs and large displaysIn conformity with customer specifications< 2000 mm100 kg

All systems are in conformity with the requirements of DIN-EN 13032-1, CIE 121, the GTB Photometry Accuracy Guidelines for type tests in conformity with UN-ECE, and SAE J1330. A conformity certificate can be supplied as an option with each system. This is issued by a test institute accredited in conformity with ISO 17025.

AMS Controller

The AMS Controller is integrated in a 19” rack together with other optional modules. It includes the servo and stepper-motor controller for the goniophotometer. It also provides a display unit for the angle position and location of the sample stage, and for the photometric values in candela, lux or candela/m². This eliminates manual conversion of the test results. The goniometer stage can be adjusted to any position within 0.01° or 0.1 mm. This makes alignment of the sample on the optical axis much easier.

Goniometer with directions of movement

Photometric values

The following photometric values can be determined with a goniophotometer:

  • Luminous intensity distribution in candela (cd) and illuminance distribution in lux (lx)
  • Luminous flux in lumen (lm) by integrating the luminous intensity distribution
  • Angle-dependent color coordinates and correlated color temperature in kelvin (K)
  • Retroreflection in millicandela per lux (mcd/lx)