With continuous development, the hyperspectral imaging has become a hot topic in the field of remote sensing, since its enormous advantage in obtaining the material composition of atmosphere, land resources, battlefield environment and marine resources while observing the Earth in space. However, some challenges have hindered the application of space-based hyperspectral imaging system. To fulfill the requirements of the spectral imager especially for space use, the lightweight and stable structure is especially important. Here the implementation of a Large Aperture Hyperspectral Imaging Optical System is presented. The optical system achieves hyperspectral imaging from ultraviolet to infrared spectral bands. The different spectral bands share a large common aperture of Ø1.8m. A lightweight primary mirror is designed and supported by bipod structure. To keep the large distance between the primary mirror and second mirror, a Lightweight and high-strength truss has been applied. A hierarchical structure is adopt as the main structure of the whole system. With the diffraction gratings and optical slits, the image information of different spectral bands are detected by the different lines of pixels in a focal plane of planar array. By the creative works of the optical and mechanical design, a hyperspectral imaging optical system is implemented and shows the extensive application potential in space remote sensing.
High performance infrared lens used in aerospace optical remote sensing systems have great benefit in resource exploration, pollution monitoring etc. However the high technical threshold of manufacture, the production and launch cost due to the heavy infrared optical materials, and the long period of alignment have restricted its use especially for civil and commercial aerospace. Here we present a realization of aerospace infrared lens for mass production. An unique opto-mechanical structure design has been implemented in order to meet the requirements of the mass production of space infrared lens. Some high effective, low cost processing technology are used both for optical and mechanical parts. The produced lenses have the biggest diameter of 300mm and the best RMS of λ/50(λ=632.8nm). A smart alignment based on an online device with lens alignment and image quality measurement reduces the period from 30 days to 7 days. With the well assembled infrared lens, the space camera has a system wavefront of 0.1λRMS (λ=3.39μm) and the MTF of 0.38(@25lp/mm).
The properties and developments of materials for large aperture space mirrors, which are pursued for high-resolution
earth observation and deep space exploration, are summarized in this paper. All these materials were classified into
several kinds depend on their substance and performance. Their advantages and disadvantages in manufacturing large
aperture space mirrors were discussed; especially their fabrication, optical machining and application. The trends of
development of materials for large space mirrors are overviewed.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.