Measurement principle

The instrument design optimizes throughput and sensitivity by sending all the light to either the camera or to the spectroradiometer – resulting in significant takt time improvements when low light measurements are required.

Key to the WP512’s unique capability is the high-speed linear translation stage. The stage has multiple positions for imaging light with the RGB camera or with the spectroradiometer. In addition, optional filtering is available up to ND1 in the RGB camera path or ND2 in the spectrometer path. Low luminance measurements are crucial for takt time optimization in many production scenarios. Having higher throughput, the WP512 is two times faster at the bottleneck measurements than comparable beam-splitter solutions that share the light with two or more focal planes.

The neutral density filter options accommodate a wide range of light measurements. Users can measure very bright scenes; or attenuate to increase the optimal exposure time. For example, although the camera and spectrometer can have sub-millisecond exposure times, a display modulated at 30Hz may be best measured at exposures of 33.3ms. 

Additionally, the method has very low polarization dependence and minimal chromatic and geometrical distortion – both critical parameters of measurement accuracy.

Conveniently, when the camera is imaging, the spectrometer is shuttered and vice-versa. In this way, frequent dark measurement correction is available in production without affecting takt time.