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Spectroradiometers
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Most modern spectroradiometers are designed to measure the absolute spectral quantity,
in terms of power, of the light under test by breaking up the broad band incoming
optical signal into it's component parts by means of a diffraction grating - much
like a prism. The diffracted light is then imaged onto a multi-element detector.
Each detector element in turn samples it's own part of the diffracted spectrum.
In addition to the measured spectral data, luminance, CIE chromaticity values, reflectance
and transmittance are readily obtained from the spectral information.
Photo Research spectroradiometers are designed to measure radiance (watts/steradian/square meter) utilizing the patented Pritchard optics to collect the incoming optical radiation. Their ease-of-use, accuracy and reliability has made this product family the most widely used. Our spectroradiometers are tailored for display measurement, but can be outfitted to address virtually any light measurement application. Product Family: PR-655 SpectraScan, PR-670 SpectraScan, PR-680 SpectraDuo, PR-705/715, PR-650, PR-1980B
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Photometers
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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 utilize 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. Product Family: PR-524 LiteMate, PR-525 ColorMate, PR-880, PR-1980A, PR-1500, PR-1530AR, LiteMate
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Video Photometers
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A video photometer differs from traditional photometers by utilizing a multi-element,
two-dimensional detector - most typically, a CCD. This gives the video photometer
the ability to take a "snapshot" of the target and then perform photometric analysis
of the captured image. Tasks such as display uniformity can be completed in a fraction
of the time with a video photometer in place of a more traditional instrument because
several "measurements" can be performed simultaneously on a captured image.
Like traditional "spot" photometers, the detector spectral response of Video Photometers is filtered to match the CIE Photopic response function for accurately weighted photometric measurements. The Photo Research Video Photometer family consists of PR-920 and the PR-905
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Systems
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| PR-P7, PR-9000 | |||||||||||||||||||
| Copyright 2007 Photo Research, Inc. All rights reserved. |