Ultraviolet Detector

Teledyne e2v
Chelmsford, UK
+44 (0) 1245 493493

Teledyne e2v, a part of the Teledyne Imaging Group, and a Teledyne Technologies company, has been contracted by the European Space Agency (ESA) to develop an improved version of its previously supplied CCD69 detector. Utilizing the experience and data available from the ESA Aeolus mission, hosting the first Doppler Wind Lidar in space, Teledyne e2v will further enhance the performance and sensitivity of the ultraviolet detector that could ultimately be deployed in the next generation space-based Doppler Wind Lidar instruments.

Teledyne e2v provided the CCD69 detector for the Aeolus mission, currently in orbit gathering atmospheric wind profiles across the Earth, launched on 22nd August 2018.

The Aeolus wind observations have had a significant positive impact on weather forecasts and are currently used by several weather centers. This has led to an interest by EUMETSAT and ESA member states for a possible future operational Doppler Wind Lidar Meteorological mission. Phase A/B1 instrument activities and Phase A operations and ground segment activities are, therefore, ongoing at ESA and EUMETSAT.

Aeolus’ ALADIN instrument, the first satellite mission to provide profiles of Earth’s winds, works by emitting an ultraviolet laser beam through the Earth’s atmosphere and measuring the reflected return signal from air molecules and particles (aerosols and hydrometeors) in the atmosphere. Teledyne e2v, in collaboration with Airbus Defence & Space and ESA, developed an innovative type of detector that simultaneously measures the travel time and Doppler-shift of the returned ultraviolet laser pulse to resolve the atmospheric wind speed at different altitudes along the instrument line-of sight, from the surface or top of optically thin clouds up to about 30 km altitude. This technique also allows for the detection of thin aerosol and cloud layer and the top altitude of thick clouds.

The returned signal is typically extremely weak, however the detector has the capability to add together a number of returned pulses to improve the accuracy of the measurements. Aeolus is the first satellite of its kind to utilize this type of technology in space.

Aeolus’ data is being distributed publicly to forecasting services and scientific users across the world in less than three hours of sensing, and is used in the daily forecasts of several European weather centers and in particular the UK’s Met Office.

Teledyne e2v is part of the Teledyne Imaging Group. Their innovations frequently contribute to developments in healthcare, life sciences, space, transportation, defense and security, and industrial markets.

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