Profiling Radiometers General


Ultraviolet and Visible Wavelength Profiling Radiometers


Compact Optical Profiling Systems (C-OPS)

BSIs newest, high-performance freefall aquatic profiler, the C-OPS, is a radiometer system for determining apparent optical properties in shallow-water aquatic systems. It consists of two radiometers: one measuring in-water upwelling radiance, and the other either downward irradiance or upward irradiance. Both radiometers are equipped with up to 19 wavebands and are mounted in a free-fall backplane that can be optimized for either slow descent rates for work in very shallow waters, or faster descent rates for observations in the deeper systems up to 125 m.

The distinguishing features of the C-OPS radiometers are:
  • Complete, integrated system for measuring radiometric variables in optically complex waters; ideal for aquatic profiling in shallow water
  • Submersible instruments are optimized for measuring vertical profiles of radiance and irradiance at depth; surface reference optimized for use in air
  • Rapid sampling (15 Hz); slow, freefall descent; adjustable buoyancy; it is hand deployed; and has a 125 m maximum depth
  • Very wide dynamic range (10+ decades); based on microradiometer technology (the system does not saturate at natural light levels even when the radiance aperture is pointed directly at the solar disk)
  • Up to 19 discrete microradiometer wavebands radiance and irradiance; covering the UV-B 305 to 865 nm in the SWIR spectral range
  • Narrow radiance FOV of 3.25°;
  • Irradiance cosine departure of less than 2% from 0–65° and less than 10% from 65–85°
  • Accessories include above-water reference irradiance sensors to measure incident irradiance, the “BioSHADE” shadowband assembly for making diffuse measurements, and the “BioGPS” for providing position and time.

Profiling Reflectance Radiometer (PRR-800 and PRR-2600)

A more traditional profiling system, which can be hand deployed or used in free-fall is the PRR-800 or the smaller PRR-2600 reflectance radiometer systems. Over the time span of the SeaWiFS mission, there has been a continuing commitment for better instrumentation plus an increased focus of ocean color field activities on coastal waters. The culmination of these pursuits has been a new generation of instruments to measure the apparent optical properties (AOPs) based on the PRR-800 series.

PRR-800 System with lowering framePRR-800 System with lowering frame

The distinguishing features of these radiometers are:

Very high spectral coverage (PRR-2600 has 8; PRR-800 has from 15 to up to 19 wavelengths), 10 nm bandwidths, covering the UV-B from 305 nm to 865 nm in the SWIR

High-speed, low-noise, 3-stage amplification and 16-bit digitization circuitry

Very wide dynamic range (9 decades; the system does not saturate at natural light levels even when the radiance aperture is pointed directly at the solar disk)

Hand deployed; 350 m maximum depth

PRR-800 is available in straight (shown) and split configurations. It is also available for lowering from the side of a boat, or in split configuration. Both the straight and split configurations are available with free-fall accessories.


Ultraviolet Profiling Radiometer: PUV-2500

Biospherical Instruments' PUV-2500 is a submersible, multichannel, profiling, ultraviolet radiometer designed to make measurements of UV and PAR (Photosynthetically Active Radiation — 400–700 nm) irradiance to depths of 350 m. The instrument combines UV optimized irradiance optics with a high-speed data acquisition system and advanced electronics in a compact, rugged design. The standard PUV-2500 measures downwelling cosine irradiance at 7 wavebands, upwelling chlorophyll natural fluorescence, pressure/depth, and water temperature. 
  • Measures 7 (optionally 8) wavebands of downwelling irradiance and 1 upwelling radiance channel
  • Includes sensors for measurement of pressure/depth (350 m maximum) and water temperature
  • Uses specialized, highly stable, solid-state sensors with optimized UV interference filter/photodetectors
  • PUV-2510 radiometrically matching surface instrument is also available
  • Compact design is battery-powered and ideal for hand deployment from a small craft and other vessels

4 Channel Profiling Radiometers for UV and Visible

Biospherical Instruments’ BIC family of radiometers are scaled-down version of our widely used PUV/GUV and PRR instrument systems. The standard BIC measures downwelling (cosine) irradiance in three monochromatic wavebands, as well as PAR (400–700 nm). Wavelengths are available ranging from 305 nm in the UV-B, to 875 nm in the near infrared. BIC photodetectors share a common Teflon collector for maximum accuracy over time. BICs are available in submersible and surface reference versions. A submersible BIC fitted with optional temperature and pressure transducers may be combined with a matching surface reference BIC to provide accurate vertical profiles of irradiance down to 100 m. Compact and lightweight, the BIC features a wide dynamic-range (>5 decades) and is suitable for a variety of aquatic research applications. The BIC connects to either a PC workstation or laptop computer (not included) for all data-acquisition duties. Windows-based LoggerLight software is included.

The distinguishing features of these radiometers are:
    BIR deployed from a small boatBIR deployed from a small boat
  • Measures cosine irradiance in four user-selected UV wavelengths (305, 313, 320, 340, 380, or 395 nm) or 3 wavebands and PAR (400–700 nm)
  •  Serial output affords direct connection with a computer or PC-based datalogger
  • Suitable for both aquatic profiling and remote field measurements
  • Optional sensors for water temperature and depth
  • Windows-based data-acquisition software
  • 5 decades of dynamic range; up to 2 Hz sampling speed
  • Compact design is battery-powered and ideal for hand deployment from a small craft and other vessels
Last Updated on Wednesday, 06 October 2010 11:54
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