How to set up and calibrate the goniophotometer?

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A goniophotometer is a photometer used to assess the light coming from off-axis sources. The usage of goniophotometers has skyrocketed in recent years due to the proliferation of LED lighting in the automobile sector.

A black tunnel, or tunnel protected by black baffles, is ideal for using the goniophotometer. Because of the potential for errors introduced by stray light, the dark tunnel is essential for reliable testing results.

System setup

The goniophotometer will be exposed to ambient lighting instead of the dark tube. Aligning the goniophotometer, baffles, and the detector is essential for obtaining reliable test results. It is also called light intensity meter.

Baffle design

Both baffle one and baffle two are made of the same materials and have the same structure. The plastic board is an excellent alternative to several other materials due to its low price and weight.

A t-slotted aluminum profile is used to construct the frame that surrounds the whiteboard. The assembly and disassembly of any building manufactured using a T-slotted aluminum profile are simple and do not need additional labor costs.

Additionally, aluminum is far less heavy than steel. It is possible to install four rollers equipped with brakes below the frame to move them to any needed area. There are less than one hundred pounds of weight in each baffle.

Alignment and calibration

When producing precise findings with the goniophotometer, alignment is one of the most critical variables. The goniophotometer, three baffles, and detector should all be aligned with the laser. It's a hundred feet from the detector to the goniophotometer. The technique for adjusting the alignment of the system is illustrated below.

  1. Put the laser on top of the goniophotometer, so there is no rotating angle.
  2. Place two whiteboards over the windows on baffles 1 and 2 to obscure their view.
  3. First, it should fix the location of the baffle; then, the baffle should be calibrated such that the laser hits its center point.
  4. It must first remove the lid to enable the laser to go through baffle 1.
  5. Fix the location of baffle 2 when you have calibrated it to the point where the laser is striking the center of its target.
  6. Please remove the lid on the baffle so the laser can freely go through it. 

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