Photometric Sensors

Our photometric sensors are designed with advanced photometric filters to simulate the response of the human visual system and match the spectral response of a standard observer. When coupled with an optometer, photodetectors are used to measure luminous flux (lm), illuminance (lux), luminous intensity (cd) and luminance (cd/m²).

UDTi photosensors and sensor heads are offered in three different mechanical configurations: Sensors from the Standard Series adapt for use with most accessories. The Miniature Series includes a similar range of sensors with a smaller-diameter package, compatible with UDTi’s line of integrating sphere accessories. The Low-Profile Series is designed for applications with limited mechanical clearance.

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Measurement Applications
  • Luminous Flux Measurements
  • Illuminance Measurements
  • Luminous Intensity Measurements
  • Luminance Measurements
Radiometric Sensors
  • Radiant Flux Measurements
  • Irradiance Measurements
  • Radiant Intensity Measurements
  • Radiance Measurements
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The UDT Instruments Advantage

  • UDTi designs the most accurate photometric filters in the world, with an unsurpassed ability to match the human eye’s sensitivity to color and light intensity
  • Optical Sensors from UDT Instruments have been developed for maximum compatibility with your existing optical measurement systems
  • UDTi also manufactures high-performance optometers and integrating spheres to create complete photometric and radiometric test systems
  • Each UDTi sensor includes a NIST-traceable calibration

Model 211 Photometric Sensor

Model 211 Photometric Sensor

 

The model 211 is UDTi’s universal photometric head as it can be adapted for use with most accessories. It consists of a Standard Series silicon sensor a spectrally-matched photometric filter and a cosine diffuser to reduce directional sensitivity.

  • Standard Calibration(s): lux; fc
  • Photometric Filter Accuracy: < 1.0%
  • CIE V(λ) Function: < f1′ ≤ 3%
  • Sensor Active Area (cm2): 1
  • Dynamic Range: 1.0E-02 – 5.0E+05 lux
  • Typical Response: 3.2E-09 A/lux @555 nm
  • Features: High accuracy photometric filter (f’1 < 3%)
  • Compatible Components: 2525; 2500; 1153; 1120; 116; 124; 114; 105; 106; 107
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Model 263 Illuminance Sensor – Miniature

Model 263 Photometric Sensor

 

The Model 263 is a scaled-down version of the Model 211 designed for use in confined spaces. It consists of a silicon sensor with a spectrally-matched photometric filter and a cosine diffuser to reduce directional sensitivity.

  • Standard Calibration(s): lux; fc
  • Photometric Filter Accuracy: < 1.0%
  • CIE V(λ) Function: < f1′ ≤ 3%
  • Sensor Active Area (cm2): 0.34
  • Dynamic Range: 5.0E-01 – 5.0E+05 lux
  • Typical Response: 7.3E-10 A/lux @555 nm
  • Features: High accuracy photometric filter (f’1 < 3%)
  • Compatible Components: 2575; With adaptor #1718: 2525; 2500
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Model 268P Illuminance Sensor – Low Profile

Model_268P Photometric Sensor
The Model 268P is a low-profile illuminance sensor designed for applications with limited mechanical clearance. Like the Model 211 it consists of a silicon sensor with a spectrally matched photometric filter and a cosine diffuser to reduce directional sensitivity.

  • Standard Calibration(s): lux; fc
  • Photometric Filter Accuracy: < 1.0%
  • CIE V(λ) Function: < f1′ ≤ 3%
  • Sensor Active Area (cm2): 1
  • Dynamic Range: 1.0E-03 – 2.0E+04 lux
  • Features: High accuracy photometric filter (f’1 < 3%)
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Model 424 LED Measurement Head

Model 424 Photometric Sensor

 

This sensor head couples a high-performance photopic sensor (based on the Model 211) with a special fixture to measure the averaged luminous intensity of LEDs according to the recommendations of CIE Publication 127 (illustrated above; LED Sockets sold separately). The intensity fixture precisely sets the distance and alignment between the LED and the sensor‚ so that measurement accuracy and repeatability are ensured. The system can easily be configured for either of the CIE-prescribed geometries: Condition A or Condition B. Measurement results are expressed in units of candela (cd). The sensor is calibrated over the visible spectral range‚ so that the nominal peak wavelength of the device under test can be selected during measurement‚ ensuring maximum possible measurement accuracy.

  • Standard Calibration(s): Luminous Intensity (cd) for both CIE127 Conditions: A and B
  • Dynamic Range: 1.0E-04 – 5.0E+04 cd
  • UDT Instruments LED Sockets
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