Aerial monitoring with ELF OWL™ and AIR OWL™ sensor systems

The ELF OWL™ sensor system - designed for drones

ELF OWL™ is the worlds most compact Hyper-spectral Laser Induced Fluorescence LiDAR sensor. It has been specially designed with footprint and weight in mind. Measuring 25x30x45 cm and weighing only 22 kg, the ELF OWL™ has the same detection capacity as a SEA OWL™ system.

We designed the ELF OWL™ with aerial operations in mind, particularly coastal monitoring from the air, but also for ocean monitoring. We designed the ELF OWL™ system based on the analysis of the technical requirements needed for operations over water.
The  construction of the sensing laser (a customized model of the excimer laser with 308 nm emission) was redesigned for weight minimization and lower electromagnetic interference (EMI) to other electronics equipment onboard of a UAV. The optical layout of the ELF OWL™ was optimized to increase the light aperture by applying the multi-module telescope with fibre cable output coupled with hyper-spectral detector. New detector schematics was implemented to get more intelligence and functionality.

The ELF OWL™ system consists of operational control, data processing and communication of LiDAR controller and external control software. The LiDAR controller modification includes functionality for in-flight operation and interfacing with on-board flight control system. The current software system OWL™MAP for maritime vessel based SEA OWL™ has been used as a base. In addition to the modification of existing software the following new components and/or software integration is specified:

  • Tracking and monitoring of drones, integration of Aeronautical Information Service(s), (not to be confused with Automatic Identification Services, used for maritime vessel tracking);
  • Support for new data collection and compression methods to account for high(er) frequency data collection (due to drone flying speed differences to maritime vessels);
  • Integration of new communication channels, in addition to radio communications, e.g. satellites (usually less bandwidth and more expensive, but may be the only option in remote areas)
  • End-user software interface adaptations to include (near) real-time drone location and data visualizations.

The AIR OWL™ sensor system - designed for airplanes

AIR OWL™ (Oil-in-Water Locator) is a Hyper-spectral Laser Induced Fluorescence (HLIF) LiDAR (Light Detection and Ranging) for airborne remote detection, identification and quantification of oil spill in water measured from a fixed wing aircraft. The principal layout of AIR OWL™ consists of  modules providing sensing from the air into the water with a laser pulse and the spectral detection of the echo-signal with following analysis.

An Onboard Mission Management System (MMS) is not a part of AIR OWL™ but serves as an external operator console integrating the basic control of the AIR OWL™ and data reception and visualization. The MMS sends the commands and receive the observation data layer for the full picture. The AIR OWL™ display data in a map that adds qualitative and quantitative information on oil pollution for real-time observation and decision making.

A laser is responsible for releasing powerful UV light pulses in regulated time slots. The Hyper-spectral detector consists of an optical telescope, a spectral unit (polychromator), and a multi-channel optical detector (MOD). The detector serves for collecting Laser Induced Fluorescence (LIF) light flux from a distant water surface, to disperse that light into linear spectrum, convert that spectral distributed light into multi-channel electrical signal with the aid of a gated intensified multichannel detector, perform digital readout of each of the channel value and record these spectral data. The resulting spectrum serves as an input for identification and calculation of the spatial distribution of pollution.

A Real Time Controller (RTC) is responsible for proper handling of simultaneous and time critical events. There are more essential functions incorporated in RTC that simplifies the overall operation of the HLIF sensor. An Onboard Control and Command Server (OCCS) serves for evaluating organic pollution distribution, quantity, alarms, maintaining HLIF GIS database, providing organic pollution distribution map layer in real time for the MMS.

A Space & Time Awareness Module (STAM) serves for binding each spectrum to GIS database, making it possible to locate each spectrum/sample/alarm on the map and in the timeline.


Welcome to Ocean Visuals

Ocean Visuals AS is a Norwegian company providing sensor systems for early detection of oil and organics in water.