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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Radiance Meters/Optical Power Meters


This radiance meter/optical power meter system  bundle combines a filtered silicon sensor with a  fixed‐focus lens to provide non‐contact radiance  measurement of an area on the surface of an  extended source. Spot size is dependent working  distance, which ranges from 17 mm to infinity.

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Irradiance Meters


This irradiance meter bundle combines a broadband silicon sensor with a benchtop optometer to provide simple and accurate measurement of irradiance. The system’s calibration is programmed into the benchtop optometer. Measurement results are displayed by the optometer in units of Watts per square meter (W/m²), and digital data can be acquired directly via PC.

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Radiometric Sensors


UDT Instruments produces precision radiometric sensors for diverse applications and are ideally suited for OEMs and value-added resellers. UDTi radiometric sensors provide industry leading accuracy, and each sensor from UDT Instruments includes a NIST-traceable calibration from our NVLAP accredited laboratory (NVLAP Lab Code 200823-0).

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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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