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PMA 2132 Quantum Detector

 

The PMA2132 Quantum detector measures the photon flux in wavelength range from 400 to 700 nm. The PMA2132 has a water-proof enclosure and can operate outdoors or in a wet environment. There is a proportional relationship between the number of photons absorbed in 400 to 700 nm band and the rate of photosynthesis in plants.

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FEATURES

  • High sensitivity
  • Wide dynamic range
  • Excellent long term stability
  • Cosine corrected
  • NIST traceable calibration
  • Hermetic enclosure

APPLICATIONS

  • Agriculture
  • Photobiology
  • Meteorology and climatology
  • Environmental monitoring
  • Educational

> 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 energy of a photon is proportional to its frequency and therefore inversely proportional to wavelength. In order to produce a signal proportional to the photon flux (number of photons per unit of area per second) the detector’s spectral power response (in Amps/[W/cm2]) must be inversely proportional to the photon’s
frequency and therefore proportional to wavelength. Traditionally the quantum flux is measured in micro-moles (also called micro-Einsteins) per second per square meter. The conversion factor is:

1µE/s/m2 = 1µmole/s/m2 = 6.02*1017 quanta/s/m2

The angular response of the PMA2132 detector is cosine corrected and suitable for measurements of diffuse radiation or radiation from extended sources.

Specifications

  • Spectral response Quantum response (400-700nm) Figure 1
  • Angular response 5% for angles <80°
  • Range 20,000 uEinsteins/second/m2
  • Display resolution 0.1 uEinsteins/second/m2
  • Operating environment -40 to 120°F (-40 to +50°C) outdoors
  • Temperature coefficient <0.15%/°C
  • Cable 50ft (15m)
  • Diameter 1.6" (40.6 mm)
  • Height 1.8" (45.8 mm)
  • Weight 7.1 oz. (200 grams)

Analog versions of this detector are available See PMA1132

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