Luminance Meters

UDT Instruments makes a range of luminance meter systems for non-contact measurement of display surfaces.

We have created three luminance meter bundles that combine a benchtop or portable photometer with our sensors, optics and NIST-traceable calibrations for complete solutions.

In addition to the standard systems described here, we offer a variety of lens accessories to fit most any working-distance versus measurement-field-size requirement. Many variations and extensions of these basic systems are available. Contact us today for more information on creating a custom system.

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Measurement Applications
  • Luminance
  • Contrast Ratio
  • Gamma (Gray Scale/EOTF)
Guide to Photometry

What’s in the Guide?

  • Definitions of the most important terms in photometry
  • Photometric to radiometric conversion factors
  • How to specify a photometer system
  • Photometric quantity units, symbols and abbreviations

 

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uNIT-LL Handheld Luminance Meter

This bundle combines a photopic sensor with a fixed-focus lens to provide non-contact measurement of an area on the display surface. Spot size is dependent working distance, which ranges from 17 mm to infinity. This system is suitable for the following types of test and measurements: Luminance, Contrast Ratio, Gamma (Gray Scale/EOTF).

The system’s luminance calibration is programmed into the handheld portable optometer. Measurement results are displayed by the optometer in units of footlamberts or cd/m², and digital data can be acquired directly via PC.

Components

  • PhotometerModel S471: Portable Photometer with LCD display and RS-232 Interface; 50 programmable calibrations; AC or battery-powered
  • SensorModel 2153 Brightness sensor: Luminance sensor with high performance photopic filter (f1′< 3%); fixed-focus lens; 13° Field of View
  • Calibration – U68072: Luminance calibration – NIST Traceable in units of footlamberts (fL) or cd/m² (nit)
  • Alternative PhotometerS470 flexOptometer: Benchtop Photometer, Single Channel; IEEE-488, RS-232, RS-485, USB
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uNIT-R Reflex Luminance Meter

This Telephotometer bundle combines a photopic sensor with a reflex viewing system and a standard camera lens to provide non-contact measurement of a precisely-defined spot on the display surface. The user can view an image of the measurement spot superimposed on the display. Spot size is determined by working distance (adjusted by the lens-focusing mechanism) and the field of view (FOV). This system is suitable for the following types of test and measurements: Luminance, Contrast Ratio, Gamma (Gray Scale/EOTF).

The system’s luminance calibration is programmed into the benchtop optometer. Measurement results are displayed by the optometer in units of footlamberts or cd/m², or digital data can be acquired directly via PC.
Components

  • Photometer – S470 flexOptometer: Benchtop Photometer, Single Channel; IEEE-488, RS-232, RS-485, USB
  • Sensor Model 211 Photopic sensor: High performance (f1′< 3%)
  • Optics – Model 1120 Reflex Viewing module: Pritchard viewing optics present image of measurement spot; 3.3° Field of View
  • Optics – Model 1351 55mm Macro Lens
  • Calibration – U68072: Luminance calibration – NIST Traceable in units of footlamberts (fL) or cd/m²
  • Mounting Hardware – Model 109 Heavy-Duty Lab Stand
  • Optional – Model 1706 Tabletop Tripod
  • Alternative Photometer – Model S471: Portable Photometer with LCD display, RS-232 Interface; 50 programmable cals; AC or Battery power
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TIA-NIT Luminance Measurement System

This bundle combines a high-quality, thermoelectrically-stabilized photopic sensor with reflex imaging optics and a state of the art transimpedance amplifier to provide highly accurate and stable luminance measurements – even at very low light levels.

The system’s luminance calibration is programmed into the integrated control/display unit. Measurement results are displayed in units of nits (cd/m2), and digital data can be acquired directly via USB interface.

Components

  • Sensor – Model 47108: Photometric Sensor/Amplifier; high-quality photopic filter (f1′< 3%); TE-stabilized
  • TEC Controller – Model 19847-1USB: Front Panel Direct Readout and USB Computer Interface
  • Luminance Head– Model 1120V: 50mm camera lens; Pritchard viewing optics; selectable Field-of-View (FOV) (6 positions: 0.1° – 5°)
  • Calibration -CAL-2LPH-TIA: Luminance responsivity calibration – NIST Traceable in units of nits (cd/m2) or footlamberts (fL)
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