[Chinese instrument network instrument research and development] Rotary double prism (Risley prism) can achieve large-angle, precise deflection control of the beam, with the characteristics of compact structure, fast response, and good environmental adaptability, the difficulty lies in simultaneously achieving high precision and large dynamics range. Many international research institutes study it. NASA's Next Generation Satellite Laser Ranging (NGSLR) uses rotating double prisms as advance sighting devices to achieve high-precision advance aiming angles, achieving 1.5′′ in a deflection range of several tens of seconds. Pointing precision; Ball Aerospace Technology uses rotating double prisms in infrared detection and sighting equipment on small aircraft such as drones, achieving a deflection angle of 70°, an accuracy of better than 200′′, and a dynamic range of deflection angle of 34 dB.
Schematic
Institute of Optoelectronics, Chinese Academy of Sciences Institute of Optics and Technology Key Laboratory of Beam Control Ren Ge and Chen Ke's research team adopted the technique of strong generalization capability physical model identification and iterative optimization of vector optics to theoretically solve the strong coupling and non-linearity of beam deflection of rotating double prisms. Solve many problems and solve the effects of processing, installation and measurement errors in engineering applications. Breakthroughs in the deflection accuracy and dynamic range of rotating bi-prisms have been achieved. Large-angle, high-precision beam deflection technology targets have been achieved: 3° The beam deflection accuracy is better than 1′′ in the deflection angle range, and the dynamic range is greater than 43dB, which is better than the highest level in the current open literature.
The relevant research results were published on Applied Optics and have applied for/entitled a number of national invention patents. The technology has broad application prospects in spatial laser communication and target tracking. The research work was supported by the key laboratories of the Chinese Academy of Sciences and the Light of the West.
(Original title: Progress has been made in the research of rotating bi-prism beam control technology in the photoelectricity)
Church Candles
Church candle is used for church, for praying,for memorial. A candle lighted by a worshiper in a church.
Candle originated in the original era of the torch. Primitive man fat or wax like on bark or wood, tied together, made for the lighting of the torch. At about third Century BC the beeswax candles may be seen today. In the west, there is a period of time, the temple in beekeeping to self-made wax, this is mainly because the Catholic church that Mila is a symbol of a virgin conception, so the beeswax as pure light, dedicated to the altar of the church. From the existing literature, beeswax in our country have roughly same time with the west, Japan is in the Nara period (710 to 784 years) in our country was introduced into the candle of, and compared to modern candle, ancient candles have many shortcomings. The Tang Dynasty poet Li Shangyin, "when he cut a total of west window candle" of the poem
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