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The PAR Irradiance Sensor is designed to be moored, profiled or deployed in towed vehicles & can be used to measure both upwelling and downwelling light and also as an on-deck reference.
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Specification

Datasheet (pdf)
Applications

Product Description

Designed to be moored, profiled or deployed in towed vehicles (AQUAshuttle, Nn-Shuttle & SeaSoar) and can be used to measure both upwelling and downwelling light and also as an on-deck reference.

Features

  • Logarithmic 6 Decade Range

  • (1 + Cosq )/2 Response

  • Relative Spectral Sensitivity flat to + 3% from
    450-700nm, down 8% of 400nm & 36% at 350nm

  • PTFE 2TT Scalar Collector

  • Angular Detection Range +130o from normal incidence

  • Protective cover when not in use

 

 

The Chelsea Technologies Group PAR (Photosynthetically Active Radiation) Scalar Quantum Irradiance Sensor was designed at Plymouth Marine Laboratory to assist the study of marine photosynthesis, where the prime concern is to quantify the amount of PAR available. 

With the use of logarithmic amplication, the sensor covers a range of 6 orders of magnitude. This has the advantage of avoiding setting up the sensor range for the expected signal level for different ambient conditions which can be tedious and can produce calibration errors between ranges. The sensor's simple construction consists of a hollow PTFE 2TT collector supported by a clear acetal dome diverting light to a filter and photodiode from which a (1 + Cosq )/2 response is obtained.

The sensor's input (7 to 20 Vdc) and output (0 to 5V range covering 3000 to 0.002m Em-25-1) lend for ease of integration to standard oceanographic data acquisition systems. A depth rating of 1000 metres is achieved using a stainless steel outer casing, which also provides a mounting plate for clamping to either a profiling cage or towed vehicle. Due to the sensitivity of the collector dome itself, a cover is provided to protect the sensor when not in use.

Specification

Dimensions 
   Length 


130 mm 

   Diameter

50mm

Material

PTFE, Acetal and Stainless Steel

Weight
   in air
   in water


0.85 kg
0.5 kg

Operating Depth

1000m

Supply Voltage

7-20VDC

Connector

VSG-4-BCL (others on request)

Output

0 to 5V

Range

2000-0.002mE.m-2.5-1 (E=6.023 x 1023 quanta)

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

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