Sequoia: Hyper-a – Hyper-Spectral Absorption Instrument

In-situ absorption meter based on the integrating sphere principle.

The Hyper-a is designed for precision, in-situ bulk absorption measurements of dissolved and suspended material in water. A removeable ND filter in the cavity wall can be used to track instrument drift, eliminating the need for sending the instrument back for factory calibration.

The Hyper-a is designed for precision absorption measurements of dissolved and suspended material in water (bulk properties). The instrument features an enclosed flowthrough integrating sphere attached to one end. Two quartz windows inside the sphere are used to emit light into the sphere and record the resulting spectrum. An external submersible pump is used to flow water through the integrating sphere. The Hyper-a uses a broadly emitting xenon arc lamp as a light source.

A spectrometer viewing the interior of the integrating sphere measures the light level at sub-nanometer resolution. A second spectrometer views the light source internally, providing a reference. A removeable ND filter in the cavity wall can be used to track instrument drift

Features

  • – High precision absorption measurements
  • – High-performance depth and temperature sensors.
  • – Internal data storage.
  • – Powered from external battery pack (optional accessory), CTD, or up to 50 m power/communication USB cable.
  • – Up to 3 spectral filters for correcting for phytoplankton and other fluorescence.
  • – Included SeaBird pump (SBE-5P)

Specifications

Optical
  • – Measurement wavelength range: 300-750 nm
  • – Spectral resolution: 300-350 nm @ 5 nm; 350-750 nm @ 2 nm
Mechanical and Environmental
  • – Operational temperature range: -3 °C to 40 °C
  • – Storage temperature range: -20 °C to 60 °C
  • – Dimensions [Ø X L]: 11.3 cm × 57.6 cm (5.25” x 22.7”) including handle
  • – Weight [air / water]: 8.2kg / 2.9kg (18.1 lbs / 6.5 lbs)
  • – Depth rating: 600 meters
General and Electrical
  • – Parameters measured/derived: Absorption Coefficient (1/m)
  • – Data interface: RS-232 serial, 19200 baud, 8 bits, no parity, 1 stop
  • – Sample rate: Sampling rate will vary with signal level
  • – Input voltage: 9 V to 30 V
  • – Current draw @12 V: Max 2.5 A
  • – Storage: Internal datalogger with 1 GB microSD memory

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