Setting and Execution of Near-field Distribution Measurement

Before measuring the setting, the imaging colorimeter should be accurately placed at the center of the angular meter.

In this way, the central axis of the imaging colorimeter (note: the central line of the imaging colorimeter lens) can be positioned at the center of the two rotating axes of the goniometer - so the front of the imaging colorimeter is just parallel to the frame of the goniometer.

The initial position is manually placed, and laser alignment is used and the angle is accurately aligned by software fine-tuning.
Usually in the measuring process, the light source needs to tilt in the vertical direction of +/-90 degrees (from upward to downward) and rotate in the horizontal direction from left to right of +/-90 degrees (but only in the effective point movement to improve the measurement speed).

The minimum angle step can be set to 0.1 degree, although 2.5 degree to 5 degree is enough precise for practical application. It can also set different angle stepping values in different measuring areas - the stepping values near the normal angle are small, and the stepping values far from the normal angle are large.

The measuring time is usually from half an hour to two hours, depending on the light source and the angle step value of the measurement. A complete description of a light source usually requires collecting more than 1,000 images.

The luminance and color information are included in the measurement results of each specified angle of the light source. The angle meter drives the light source to tilt and rotate so that the imaging brightness meter can measure the whole light source completely.

The angular distribution of the light source output is obtained from various perspectives (which is more abundant than the data of single-point measurement model).