Photosynthetically Active Radiation (PAR) Sensor - provides highly sensitive data on light irradiance through the water column down to depths of 1000 metres

Photosynthetically Active Radiation (PAR) Sensor provides highly sensitive data on light irradiance through the water column down to depths of 1000 metres.Chealsea Technologies Group's Photosynthetically Active Radiation (PAR) Sensor provides highly sensitive data on light irradiance through the water column down to depths of 1000 metres. It is ideally suited to monitoring marine photosynthesis, where the prime concern is to quantify the amount of PAR available.

 

It is frequently included as part of the CTG FastOcean Fast Repetition Rate fluorometer systems wherein it can be easily integrated. It is also frequently fitted with both profiling and vehicle systems together with CTG fluorometers such as AquaTracka III, TriLux and UniLux, and provides an important reference for these measurements.

 

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Applications

  • Sea-truthing of satellite data
  • Referencing in situ fluorometer measurements
  • Referencing primary productivity measurements
  • Compatible with CTG’s range of FastOcean Fast Repetition Rate fluorometers 

Features

  • High sensitivity
  • Long term calibration stability
  • Logarithmic 6 Decade range
  • Wide angular detection range
  • 1000 metre depth rating

How does it work?

CTG's Photosynthetically Active Radiation (PAR) Sensor provides highly sensitive data on light irradiance through the water column down to depths of 1000 metres.  Light is efficiently collected by a PTFE 2π Scalar Collector, supported by a clear acetal dome, and is directed onto a photodiode via a filter from which a (1+Cosθ)/2 response is obtained. With use of logarithmic amplification, the sensor covers a range of 6 orders of magnitude. The sensor’s input (7 to 20 Vdc) and output 0 to 5 V range covering 3000 to 0.002µEm-2s-1) lends for ease of integration to standard oceanographic data acquisition systems.

Configurations

The CTG PAR Sensor is frequently included as part of the CTG FastOcean Fast Repetition Rate fluorometer systems wherein it can be easily integrated. It is also frequently fitted with both profiling and vehicle systems together with CTG fluorometers such as AquaTracka III, TriLux and UniLux, and provides an important reference for these measurements.

Specifications

Size Ø 50 mm x 130mm
Material PTFE, Acetal and Stainless Steel
Weight  0.85 kg in air/0.5kg in water
Operating depth 1000 metres 
Input voltage 7 - 20V
Output 0 to 5 Vdc
Range 3000 to 0.002µEm-2s-1
(E=6.023 x10 to the power of 23 quanta)
Relative spectral sensitivity Flat to ±3% from 470-700nm, down 8% of 400nm and 36% at350nm
Angular detection ±130° from normal incidence
Operating temperature -2°C to +32°C
Storage temperature -40°C to +70°C
Connector VSG-4-BCL

Options: Deck units, calibration equipment, softwarefor data acquisition, processing and display. 

In view of our continual improvement, the designs and specifications of our products may vary from those described