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WP512 Imaging Spectral Colorimeter

The all-in-one production tester for displays, lighting, and more

The WP512 is a unique imaging colorimeter solution comprising an integrated high-resolution camera and an internal reference spectroradiometer.

Consistently beautiful displays and lighting require accurate and precise measurement equipment on the production line. The WP512 has superb performance without the hassle and cost of multiple discrete instruments. Everything needed is in one compact package with one power connection and one GigE connection.

All display types and sizes

With a wide assortment of lenses available, from microscope objectives to wide-angle, the WP512 is configurable for measurements of any display size, from microdisplays to smartwatches, tablets, TVs, or cinema walls.

The WP512 features industry-standard EF-mount lenses.  The system supports electronic or manual lenses from 24 to 100 mm focal length, plus fixed microscope lenses up to 10X magnification.  In addition, our unique conoscopic lens for viewing angle measurements out to +/-80 degrees and a periscope lens for analysis of augmented and virtual reality near-eye displays are available.

Comprehensive solution for production testing

The WP512 has all the right features for deployment in production. The high accuracy spectroradiometer and camera have hardware triggers to synchronize the measurement with other equipment in the test setup. The camera uses advanced thermal management to keep the sensor cool and sensitive. Optional air filters attach to the fan vents to help keep dust out of the electronics area. The software automatically matches the electronic lens to the calibration file. There are also various system LEDs and beeps to confer the instrument status.

Additionally, Westboro Photonics also offers on-site recalibration software to minimize production downtime and other costs related to off-site calibration. Westboro’s Photonics’ network of international distributors and local recalibration labs provides additional support levels.

Spectral performance

The integrated, low noise CMOS spectrometer is optimized for high performance color measurements at a reasonable cost. The combination of low optical stray light and high dynamic range using exposure time stacking enables superb color measurements.

HeNe laser spectrum plotted in log scale showing <1E-4 stray light

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.