pma2132.jpgThe 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.

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:

1mE/s/m2 = 1mmole/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.

 

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

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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) or optional 1ft retractable
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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