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PMA 2135 Photopic Flash Detector
 

The PMA2135 Photopic Flash Detector measures peak irradiance and total effective energy between 400 to 700nm from flash sources. The PMA2135 Photopic flash detector provides for accurate peak irradiance and dose measurements of a single flash with a width from 0.1ms to 100ms. The Photopic detector has a spectral response which follows the CIE photopic action spectrum, the human eye’s visual
response.

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FEATURES

  • Captures Peak Irradiance and effective energy
  • Excellent long term stability
  • Cosine corrected
  • NIST traceable calibration
  • Radiometric units

APPLICATIONS

  • Laboratory and industrial radiometry
  • Flash curing
  • Strobe lighting

> Detectors need to be used with a Radiometer

> Analog version of this detector can be used with any 0 to 5 VDC or 4 to 20mA recording device

The spectral response of the human eye changes with light intensity. The eye has two distinctive spectral responses, which are defined according to the brightness of the light entering the eye. The first spectral response of the eye occurs under typical daytime lighting conditions (photopic) defined for light intensity greater than 0.1 Lux. The second spectral response occurs under low light conditions (scotopic) defined for light intensity between 0.01 and 0.0001 Lux. Light intensity less than 0.0001 Lux is undetectable by the human eye. The eye's shift from the photopic response to the scotopic response is know as the Purkinje shift. See figure 1 for spectral response. This detector is ideal for measuring flash lamps used in the curing industry.

The peak intensity of a flashed source is much higher then continuous sources. The PMA2135 Photopic flash detector captures the peak intensity and displays it on the PMA2100 for a period of 5 seconds. In addition to the peak intensity, the PMA2135 also integrates and holds the dose of a single pulse. The peak intensity of the radiation is measured in mW/cm2 or J/cm2. The full scale is specified by the user when ordered. The dose has a full scale in mJ/cm2 or J/cm2. The photodetector has an active area of 0.474 inches. The Teflon hemisphere results in the photopic detector having an exceptionally good cosine response. This response allows for
accurate measurements of both point and extended light sources.

Figure 1: Photopic Efficiency and Detector Response

Specifications

  • Spectral response Follows CIE photopic spectral luminous
    efficiency curve (400-700nm) Figure 1
  • Angular response 5% for angles <60°
  • Range Specified by user - W/cm2 or mW/cm2 J/cm2 or mJ/cm2
    Display resolution Range/104 mW/cm2 or W/cm2 Range/104 mJ/cm2 or J/cm2
  • Operating environment 15 to 140 °F (-10 to +60 °C) no precipitation
  • Cable 3ft.
  • Diameter 1.6" (40.6 mm)
  • Height 1.8" (45.8 mm)
  • Weight 10 oz. (284 grams)

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