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Quantum Detector |
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Measures Photosynthetically Active Radiation (PAR) |
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FEATURES
 | High sensitivity |
| Wide dynamic range |
| Excellent long term stability |
| Cosine corrected |
| NIST traceable calibration |
| Hermetic enclosure |
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| 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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APPLICATIONS
| Agriculture |
| Photobiology |
| Meteorology and climatology |
| Environmental monitoring |
| Educational |
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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.
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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) |
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Analog versions of this detector are available See PMA1132
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Return to Detector Selection Guide
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