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Thanks to its built-in high-performance camera from Optical Surfaces, Nigeriasat-2 — a 300kg-class Earth observation satellite manufactured by Surrey Satellite Technology for the Nigerian space agency (NASRDA) — has been able to capture 2.5m-resolution images, enabling the detailed analysis of ground structures, aircraft and vehicles.

Nigeriasat-2 carries two imagers: a 2.5m-resolution panchromatic camera and a 5m-resolution multi-spectral camera with a swath width of 20km.

Using proprietary production techniques, Optical Surfaces produced the 385mm lightweight primary mirror and other optics in the Cassegrain camera, with a surface accuracy of lambda/20p-v, which has enabled high-resolution images to be taken.

During disasters, Nigeriasat-2 will complement its fellow disaster-monitoring constellation satellites by using its high-resolution imager to zoom in on areas of interest and to determine if individual buildings are damaged, if bridges are destroyed or if roads are impassable.

Optical Surfaces

Optical Surfaces Ltd has been producing large and demanding high-precision optical components and systems for more than 40 years and is today internationally acknowledged for its technical expertise, attention to quality and customer service.

With the main workshops and test facilities deep underground in an area excavated from solid chalk, temperatures remain constant year-round and vibration is practically non-existent. These are important considerations when making, mounting and testing high-precision optics. Working with these natural advantages Optical Surfaces Ltd is able to supply high-precision off-axis parabolas, spherical and flat mirrors, etalons, aspherics, reference flats, windows, collimators and beam expanders for the most demanding applications. With such stable conditions, testing, particularly with long path lengths, becomes quantifiable and reliable. Investment in large-aperture Fizeau, Zygo GPI, Flashphase, Twyman Green, Scatterplate, and Laser Unequal Path interferometers allows detailed testing of the largest-diameter optics. Topographic and fringe analysis provides precise testing of surface roughness and confirms the wavefront of various surface forms. A rolling programme for calibration of test optics where possible to national standards and production approval to ISO 9001-2008 ensure that the quality of optics from Optical Surfaces is second to none.

Today the company is a trusted supplier to leading scientific, astronomical and defence establishments including many space projects worldwide.

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