Westboro Photonics

The only all-in-one tristimulus imaging spectral colorimeter

The WP525 is a unique imaging colorimeter solution comprising an integrated 24.6 MP camera and an internal reference spectroradiometer. As a result, the WP525 has superb performance without the hassle and cost of multiple discrete instruments. Everything needed is in one compact package, and the included Photometrica® software features all the tools required to characterize displays and lighting efficiently.

All display types and sizes

With a wide assortment of lenses available, from microscope objectives to wide-angle, the WP525 is configurable for measurements of any display size, from microdisplays to smartwatches, tablets, TVs, or cinema walls. The system supports electronic or manual lenses from 24 to 100 mm focal length, and fixed focus microscope lenses up to 10X magnification. In addition, our Conometer® Viewing Angle Lens for measurements, and the XR1 Near Eye Display Lens for analysis of augmented and virtual reality displays are available.


Key to the WP525’s unique capability is the high-speed linear translation stage. The stage has multiple positions for imaging light with the spectroradiometer or with the XRed, XBlue, Y and Z tristimulus filters and camera. In addition, there is standard filtering up to ND1 in the spectrometer path. Conveniently, the moving stage also provides positions where the imager or spectrometer is shuttered from illumination. Dark measurements to correct detector noise are fully automated.

Illustration: The fiber is fixed, and the stage moves left and right.
Top: a prism blocks the imager and deflects light to the fiber through an ND0 filter.
Middle: the prism deflects light through a ND1 filter.
Bottom: a tristimulus filter in front of the imager.

Measure and correct all colors

The tristimulus-filtered imager provides accurate color measurements. However, the spectroradiometer can be much better. For example, the imager accuracy can be improved by 2x to 10x when measuring white or monochrome LEDs and correcting with the internal reference spectroradiometer. Making color corrections with the integrated spot spectroradiometer is fast and automatic.

AR/VR display testing

The periscope design XR1 Near Eye Display (NED) Lens provides optimal test performance for augmented and virtual reality displays. The periscope design ensures the lens readily fits into final assemblies of glasses, headsets, and helmets. Under different stimuli, human visual accommodation results in varying pupil diameters. Therefore, we made sure the entrance pupil aperture is adjustable from 1.5 to 5.0 mm.

XR1 Near Eye Display Lens with WP525 Imaging Spectral Colorimeter

Distortion corrected

A menu-driven registration and distortion correction assistant allows users to correct for lens distortions. Once the correction is applied, any distortions in the display under test are revealed and can be analyzed.

Viewing angle

The Conometer® Viewing Angle Lens enables viewing angle measurements of flat panel displays and backlights.

Conometer Lens with WP525 Imaging Spectral Colorimeter

Spectral performance

The integrated, low-noise CMOS spectrometer is optimized for color measurements. 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

Comprehensive solution for production testing

The WP525 has all the right features for deployment in production applications:

  • The precision mechanics are rated for two million color and spectral measurements before maintenance is required.
  • 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.
  • Air filters attach to the fan vents to help keep dust out of the electronics area.
  • Westboro Photonics also offers on-site recalibration software to minimize production downtime and other costs related to off-site calibration.
  • In addition, Westboro Photonics’ network of international distributors and local recalibration labs provide additional support.
Photometrica software windows show an example of the spectral data from the measurement spot 2D for white, red, green and blue display settings; and an image of the display surface pseudo color mapped to luminance.

Versatility for many applications

In addition to the included Photometrica software, Westboro Photonics also offers specialized add-on software packages to help with specific tests, e.g., Uniformity, Graphics, Styling Line, Beam Pattern, Head Up Display, and more.

Flat panel display testing

Our Display Test add-on software package includes a comprehensive selection of display performance and defect tests, and  users can readily deploy solutions to production with minimal engineering effort. Performance tests include uniformity, gamma, gamut, contrast, and viewing angle. Defect tests include pixel and line defects, mura, dust, debris, etc.

Measurement Applications
  • Flat panel displays
  • Near eye displays
  • Lighting
  • LED arrays
Key Features
  • 24.6 MP imaging
  • Tristimulus imaging
  • Integrated spot spectroradiometer
  • 0.002 cd/m2 sensitivity
  • Low polarization
  • Automatic dark measurements
  • EF lenses
  • No beam splitter
Specialized Software Packages