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CCD-Based Imaging Colorimeters

Westboro Photonics P6E Series CCD Imaging Photometer

Westboro Photonics WP6 Series CCD sensor-based imaging colorimeters are offered with 4, 9 and 12 megapixel cooled sensors for the measurement of 2D luminance (cd/m2), illuminance (lux) and colour/CCT (Kelvin). The WP6E Series are supplied with matched, electronically controlled lenses and feature a thermoelectrically cooled CCD sensor for enhanced performance at low light levels. The WP6ES Series incorporates an integrated spectroradiometer for colour-corrected luminance and colour measurements and the highest levels of absolute measurement accuracy.

Westboro Photonics WP6, WP6E & WP6ES CCD Imaging Colorimeters

The WP6 Series are high performance imaging colorimeters based on TE-cooled CCD sensors with 4.2, 9.1 and 12.0 megapixels and a motorised filter wheel containing four colour filters matched to the CIE X1, X2, Y and Z tristimulus colour matching functions. Unique to the WP6E Series is the integration of electronically controlled lens functions with iris and focus control. These motorised lenses offer improved accuracy, precision and convenience for all applications. Stabilised Peltier-cooling of the CCD detector minimises measurement noise and drift. With sensitivity below 0.0001 cd/m², ultra-low light signals can be reliably analysed. The WP6ES adds an integrated spectroradiometer which samples the precise luminance and colour of the device under test in the centre of the camera's field of view and corrects the camera response accordingly. This promotes enhanced accuracy, particularly with coloured objects.

Westboro Photonics WP6 Imaging Colorimeters

Measurement Capabilities

The following photometric and colorimetric parameters can be measured using a WP6 Series CCD imaging colorimeter:

  • Spatial luminance (candelas per square meter, cd/m2)
  • Spatial illuminance (lux, lx)
  • Source luminous intensity (candelas, cd)
  • Spatial CIE chromaticity (1931 xy, 1960 uv, 1976 u'v' & L*a*b*)
  • Colour gamut
  • Gamma
  • Spatial correlated colour temperature (CCT, Kelvin and Duv)
  • Spatial dominant wavelength (nm)
  • OPTIONAL radiometric measurements (radiance & irradiance)

Matched Lenses

Each colorimeter has a lens that is matched to the sensor resolution and size, providing optimally crisp and clear images. By matching a lens to a particluar sensor, the images created using a Westboro colorimeter can be of a higher quality that supposedly higher resolution cameras without matched lenses. The WP6E Series are compatible with EF lenses, allowing the operator to control both lens focus and the iris (f/#) remotely, from the convenience of their computer.

Automatic Colour Correction

The WP6ES has the further benefit of a spot spectroradiometer and an imaging colorimeter integrated in the same instrument. The imaging colorimeter’s accuracy is improved to the level of the spectroradiometer by automatic correction. The spectral data also provides radiometric information and other measurement insights.

To fulfill the measurement requirements of modern displays and lighting, Westboro Photonics offers the S3 and S4 high performance spectroradiometers with excellent dynamic range, linearity, stray light suppression and signal-to-noise ratio. Westboro Photonics can also work with other fiber optic spectroradiometers; contact us for details.

Any filter-based colorimeter suffers from a degree of measurement error when tasked with measuring a light source whose spectral power distribution differs from the blackbody spectrum with which the colorimeter is calibrated. This error can be reduced by employing additional narrow band filters (for example, Westboro employ two blue filters, one matched to the X observer and the other to the XB function), but no matter how many filters are used, errors remain when the device under test (DUT) does not exhibit a blackbody type spectrum. The error is largest when measuring narrow linewidth sources, for example lasers, phosphor white and RGB LEDs, LCDs and white LEDs filtered through coloured plastic appliques. If your tests require verification of an target colour in your DUT, the integrated spectroradiometer in the WP6ES colorimeters ensures the highest possible absolute colorimetric accuracy.

It is important to note that the imaging paths for both the colorimeter and spectroradiometer in the WP690ES perfectly match, thereby assuring the compared measurement locations and geometries precisely correlate. Competing instruments do not integrate the spectroradiometer, meaning that spot sizes, sampling locations and measurement angles can differ, making correlation problematic.  Also consider that the WP6ES applies the spectroradiometric colour correction in real time, whereas competing devices may require that you first reference the DUT, then manually apply the correction through software prior to making your measurement.

Radiometric & Other Capabilities

Upon request, a WP6 Series CCD imaging colorimeter can be factory configured with a radiometric filter, which provides for measurements of irradiance and radiance. The radiometric filter replaces the standard phoopic filter, and extends the wavelength sensitivity of the camera to that of the CCD sensor, 350-1000nm. Calibration of the imaging radiometer must be performed by the user with reference to a spot spectroradiometer which is used to measure the output from the device under test. Other optionally available filters match the scotopic and circadian spectral sensitivities; IR and custom filters are also available.

Capable Software

Photometrica® software and optional software packages provide extensive options for measurement and analysis. The optional Photometrica Software Development Kit (SDK) allows for the creation of fully customised solutions using built-in scripting or external control. Click here for further details on Phometrica software.


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