The PMA1135 Photopic Flash Detector measures peak irradiance and total effective energy between 400 to 700nm from flash sources. The PMA1135 Photopic flash detector provides for accurate peak irradiance and dose measurements of a single flash with a width from 0.5ms 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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U.S.Pat.5,946,641

U.S.Pat.5,790,432

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
  

> This detector is available as an analog version only, and  can be used with any 0 to 5 VDC meter

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 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
  Power requirement  + and - 5 to 12 VDC
• 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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