ProMetric® I-SC Solution: Imaging Colorimeter with Integrated Spectrometer

10 May 2022

The ProMetric^® I-SC Solution combines the functions of an enhanced ProMetric I Imaging Colorimeter with a high-end spectrometer to provide a single platform for spectral data capture and accurate, repeatable color measurement across devices, testing environments, and over time. 

• Capture spectral and spatial measurement data simultaneously using a single solution
• Continuous operation including fully automated data capture and system calibration
• Repeatable, CIE-matched measurements

Two Measurement Systems in One

The ProMetric I-SC Solution provides a single platform for measuring spectral data, luminance (cd/m2), and chromaticity (CIE xy and u’v’) to evaluate the appearance of light-emitting devices such as displays, illuminated components, and light sources. The ProMetric I-SC Solution uses a polarization-insensitive mirror to combine the functions of an enhanced tristimulus imaging colorimeter (ProMetric I-series from Radiant) with a high-end spectroradiometer (CAS 140D from Instrument Systems GmbH). This innovative design is based on patented technology developed by Radiant Vision Systems (US Patent No 8482652). Combining two systems into one solution, the ProMetric I-SC enables manufacturers to deploy complete light and color measurement functions with ease and efficiency.

ProMetric I Imaging Colorimeter Advantages

The ProMetric I-SC Solution leverages the advantages of Radiant’s ProMetric I61 (61-megapixel) Imaging Colorimeter, which captures a complete device in a single image for fast and precise measurement of all regions of interest—down to areas as small as a display subpixel. The built-in tristimulus color filter wheel of the ProMetric I provides a system response innately close to CIE color-matching functions. This allows the system to maintain accuracy even when a device exhibits slight color shifts from the initial calibration point, extending the effectiveness of each system calibration. ProMetric I also optimizes measurement speed, capturing the greatest amount of data with the highest accuracy per data point in less than 2 seconds per full-color measurement. 

Highly Accurate Spectral Data

Spectral data can be acquired by the ProMetric I-SC solution by capturing an image of the device under test using the imaging colorimeter and directing light from a center point on the device through the fiber-optic cable to the spectrometer. The spectrometer evaluates individual wavelengths of the light beam (380-780 nm) to provide a highly accurate spectral measurement. This data can be used to determine:

• Correlated color temperature (CCT)
• Color rendering index (CRI)
• Spectral distribution
• Spectral bandwidth (i.e., at full-width half-maximum (FWHM))
• Peak wavelength
• Dominant wavelength

Spectral data can be used to characterize device output, monitor changes in emission spectra, and evaluate devices against defined tolerances. Spectral data can also be stored, exported, or used as a reference to calibrate the connected imaging colorimeter’s response according to CIE color-matching functions for new devices and device states (i.e., a different-colored display or backlit component).