Different Types and Different Test Methods of Goniophotometers

2) Type B – Rotation Luminaire Goniophotometer

Lisun LSG-1890B/LSG-1800A High Precision Rotation Luminaries Goniophotometer carries out measuring methods of fixed location and rotating luminaries. It can work by double pillars structure and single pillar structure to realize C-γ, A-α and B-β measurement solution, it fully meets CIE, IEC, LM-79, GB etc standards. LSG-1890B adopts Japanese Mitsubishi Motor and German Angle encoder System to keep the test accuracy to 0.0017 degree. It is widely used in optical industry laboratory. It is used to test for LED street luminaries, indoor luminaries and mining luminaries’ photoelectric parameters.

The detector of this kind of goniophotometer is fixed at a certain distance from the lamp, and lamp is mounted on a turntable which can be rotated on horizontal and vertical direction. The main vertical axis of the turntable is fixed, and the horizontal axis can be moved. Under the control of computer, the motor drives the vertical axis to rotate, and the photo detector will test lamp’s luminous intensity values in the different direction on the horizontal plane. When the measurement on a plane is completed, the motor of horizontal axis will drive lamps to turn at an angle, and then the photo detector will measure the luminous intensity distribution on another plane. So as the repeated progress, the vertical axis continuously rotating, and horizontal axis intermittently move, to achieve the measurement of light intensity distribution data in all directions of space. Since this kind of goniophotometer will continuously rotate and change the status of luminaries, it is not suitable for gas discharge lamps etc. whose photo and electrical parameters will be easily influenced by its working conditions. However, it is more suitable for grille lamps testing, and mainly for LED lighting manufacturers and retailers to measure the quality of the lamps.

High Precision Rotation Luminaire Goniophotometer LSG-1890B

3) Type A – Goniophotometer for Automotive and Signal Lamps

For road lighting photometric test, the current street light is mostly gas discharge lamp. According to CIE and FMVSS108 standard requirement, for the measurement of gas discharge lamps, it requires that luminaires can not be overturned. Thus, we generally use goniophotometer with moving mirror to do the test. LSG-1950 is the CIE A-α goniophotometer. It is mainly used to measure transportation industry luminaries such as traffic signal lamp, public transport, train and space ship luminaries. The photometer head keeps static and faces to the teat sample while the test samples rotates around both horizontal axis and vertical axis, so the luminous intensity and illuminance of the tested lamp or luminaires can be tested.

LSG-1950 Goniophotometer for Automotive and Signal Lamps

Goniophotometer is a large precision optical test equipment, while its measurement is a very professional work. The test equipment, laboratory construction and operating personnel is three important aspects of affecting the measurement results. On test equipment selection, we must consider the properties of the beam of lamps, especially the measurement of street lights and other outdoor lighting. And testing methods must comply with CIE far-field photometry principles, with particular attention to stray light impact of test equipment and laboratories. To ensure the accuracy of test results, in all aspects of the test equipment, we should properly place the corresponding diaphragm to eliminate stray light.

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