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Imaging Circadiometer

Advanced Spatial Analysis of Human-Centric Lighting

With the WP6E-CIRC Series imaging circadiometer from Westboro Photonics, you can quickly acquire precise measurements of displays, luminaires, and luminous scenes to evaluate the impacts of light on human scotopic, iPRGC, S-, M-, and L-cone responses. iPRGC refers to intrinsically photosensitive retinal ganglion cells. Based on the WP6E-Series imaging colorimeters, the circadiometer is offered with a high resolution image sensor with 9 Megapixels (MP).

Supports Research into “Circadian Lighting”

The understanding of human exposure to light signals can be used to correlate human physiological effects such as hospital recovery times, heart rate, pupil size, alertness, seasonal affective disorder, sleep disorders and melatonin levels. Applications include analyses of lighting, displays and specialty evening and night-time lighting applications such as hospitals, transportation, offices and other workplaces.

The WP6E-CIRC Series Range

The WP6E is available in two versions:

  • Model WP690E-CIRC: 9 MP CCD
  • Model WP690ES-CIRC: 9MP CCD with integrated spectroradiometer

All cameras employ a thermoelectrically cooled and thermally stabilised CCD detector with automated internal colour filter wheel and software control of the lens. The motorised EF lenses offer improved accuracy, precision and convenience compared with manually adjusted lenses. Three irises are calibrated at all focus distances to infinity. The Peltier-cooled detector provides an enhanced level of sensitivity, appropriate for the low light level or night-time applications for which the camera will be used. The ultrasensitive detector combines with a wide dynamic range to support exposure times from 8ms to 4.3 minutes. As a consequence, measurements can be performed from 1 μcd/m2 up to 10 kcd/m2 thus enabling critical α-Opic measurements in the photopic, mesopic and scotopic adaptation ranges. An optional built-in spectroradiometer combines the precision of a spot spectroradiometer with the power of 2D imaging, and allows you to record the spectra of the luminous scene as required by CIE S026.

Each system comes complete with Westboro’s Photometrica® image analysis software providing an extensive set of data analysis tools. Measurements include angular radiance and radiant intensity distributions as well as the ability to acquire high dynamic range scenes where intense lighting is combined with dark areas. The software also allows the identification of sources of potentially troublesome melanopic radiance. All functions can be efficiently automated with the Software Development Kit (SDK).