Optical Power Meters

  • Extensive selection of high accuracy Optical Power Meters and Radiometers
  • Every system comes with ISO17025 accredited calibration for world-class quality
  • Complete custom configurations for almost any project Benchtop or portable options for laboratory or field environments
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System Configuration Guide

Learn how to configure a radiometer or photometer system to meet your testing requirements with this free guide from Gamma Scientific.


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Guide to Radiometry

What’s in the Guide?

  • Definitions of the most important terms in radiometry
  • How to specify a radiometer system
  • Radiometric quantity units, symbols and abbreviations
  • Calibration by transfer of standards


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Handheld Radiometers/Optical Power Meters


We offer two high‐accuracy handheld radiometers/ optical power meters for use in laboratory settings or field environments. Both instruments are compatible with the full range of UDT Instruments sensor heads and are calibrated in our ISO‐17025 accredited laboratory.

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Benchtop Radiometers/Optical Power Meters

S470 and ingaas detectors

The UDT Instruments flexOptometer is a highperformance radiometer/optical power meter available with a single head or with up to four interchangeable detector heads for optimal flexibility. If your application requires measurement of low light levels, our C Series flexOptometers offer ten times greater sensitivity than standard flexOptometer systems.

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What is Radiometry?

Radiometry is the measurement of radiation in the electromagnetic spectrum. This includes ultraviolet (UV), visible and infrared (IR) light.

Radiometric measurements quantities include: Radiant Flux (Watt); Radiant Intensity (W/sr); Irradiance (W/m²); Radiance (W/m²sr).

  • Radiant Flux Measurements (in units of watts) are performed with an instrument known as a flux meter or optical power meter. This type of testing is typically used for characterizing the total output of sources such as:Lasers, LEDs, Lamps and Fiber-Optic Systems
  • Irradiance Measurements (in units of W/m²) are performed with an irradiance meter. This involves the measurement of the radiant flux incident upon a surface, per unit area. Such measurements are important in the following fields: Medical, Biological and Remote Sensing
  • Radiant Intensity Measurements (in units of W/sr) are performed with an instrument that may be described as an optical intensity meter. This type of testing is typically used for characterizing the output of a relatively small source in a particular direction. Typical devices under test include: LEDs, UV Lamps and IR Lamps
  • Radiance Measurements (in units of W/m²sr) are performed with a radiance meter. This involves measuring the light emitted in a particular direction by a given spot on the surface of an extended source. Such measurements are important in fields such as: Remote Sensing, Avionics and Night Vision
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