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Photometers are
specifically designed to measure emitted, reflected or transmitted
light in photometric terms of luminous flux, luminance, illuminance
or luminous intensity. They utilise a single detector - usually a
photomultiplier tube or silicon detector - and a filter that changes
the system response to match the photopic function recommended by the
COMMISSION INTERNATIONALE DE L'ECLAIRAGE (INTERNATIONAL COMMISSION ON ILLUMINATION).
Measurements of displays
typically require results in luminance (footlamberts or cd/m2). Photo
Research photometers feature the patented Pritchard optical system to
clearly and unambiguously define the area to be measured.
Photometer Product Family
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The PR-880
is the only fully automated filter photometer available today. We've
automated the measuring apertures (5 standard sizes),the filter
turrets, the measuring (zero) shutter and viewing (eyepiece) shutter.
All of these features are controlled by an on-board computer and are
accessed via 8 push buttons on the integral control panel.
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The PR-1500
is a sensitive, versatile photomultiplier-tube photometer that can
measure luminance at any distance from 1 3/4 inches (44 mm) to
infinity without the need for accessory lenses or changes in calibration
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The PR-1980A
Pritchard Tele/Micro Photometer, is known for its superior
performance, high sensitivity and maximum versatility in the lab or
in the field.
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The PR-1530AR
NviSpot Night Vision Radiometer/Photometer/Colorimeter is a multi-purpose
instrument designed to measure military displays for NVIS luminance
and radiance. It features an ultra-sensitive photomultiplier-tube
that provides near real-time results.
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The PR-524
- LiteMate is a completely portable hand held, battery powered
autoranging photometer used for human factors and room lighting applications.
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The PR-525
ColorMate System is a completely portable hand held, battery powered
auto ranging photometer and colourimeter Capabilities include
illuminance, CIE chromaticity and correlated colour temperature.
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