HyperOCR Hyperspectral Radiometer

Hyperspectral radiometers, with a calibrated range of 350 - 800 nm and fully characterized cosine response, are designed to be mounted on real-time profilers, coastal and deep water buoys, autonomous underwater vehicles, research vessels and airplanes.

Why do hyperspectral HOCR sensors require two calibration files?

HOCR sensors output two distinct frame types (light and dark).  Thermal dark current changes that occur within the spectrograph are corrected across the full spectrum with the use of a mechanical dark shutter that closes periodically in the radiometer.  This creates a unique frame of data that must be collected separately from the light data.  SATView requires both calibration files so that it collects both data outputs.

Can I use in air irradiance sensors in water and vice versa?

Satlantic has developed cosine collectors that are specifically designed to optimize performance in the intended media of operation (air or water). So in water irradiance sensors have cosine collectors that provide an excellent response in water but not in air. In air irradiance sensors provide an excellent cosine response in air but not in water.

What are SIP files?

Files that are delivered with Satlantic and third party equipment to describe the sensors data output and calibration coefficients come in two types. Calibration files or *.cal files and telemetry definition format files or *.tdf files. In some cases, systems are created that network many sensors together and their combined data is provided in one serial output.

The simplest example is a HOCR sensor that generates both light and dark frames. A more complex example is a HPROII profiling system that may contain as many as 5 sensors and 7 individual calibration and tdf files. These files must be used to both collect and process the data.

This can become quite confusing to keep track of all these files so Satlantic developed SIP files. All CAL and TDF files required for a system are zipped using winzip and the extension changed from *.ZIP to *.SIP. The file name includes the system description (usually the network master serial number) and the creation date. This SIP file can then be used in place of individual files to collect and process data.