The cantilever optical fiber nutation structure is designed by using piezoelectric ceramic tube. The amplitude-frequency response of the structure is measured by micro-Doppler method, and the resonance characteristics are analyzed. When the optical fiber nutation structure works under resonance, the nutation amplitude is the largest. The expansion of field of view angle has the advantages of simple structure, stable and reliable performance, easy integration, and higher coupling efficiency from spatial light to optical fiber.
There are lots of requirements of 3D terrain information in the field of traffic and forest investigation. In this paper we propose a coherent lidar system that produces 3D information of target by use of circularly scanning system. We use the frequency modulated continuous laser wave as optical source. The frequency information from the targets can be demodulated by the FFT algorithm to get the real distance information and generating a point cloud. The method has advantage of background noise resistance over traditional direct detection system. The demonstration system not only acquire the distance information of scanned target. It also measures the dynamic information such as speed of moving target. In our work, we measure the speed of swaying leaves of a tree within gentle breeze and the measurements are in line with the experimental environment at that time. Furthermore, a complicated demonstration system including four laser sources will be designed. More laser footprints can enlarge the scanning area at per second and mitigate modulation and demodulation stress of system, which acquires more detailed information.
Performance of satellite laser communications between GEO and LEO satellites can be influenced by
background light noise appeared in the field of view due to sunlight or planets and some comets. Such
influences should be studied on the ground testing platform before the space application. In this paper,
we introduce a simulator that can simulate the real case of background light noise in space environment
during the data talking via laser beam between two lonely satellites. This simulator can not only
simulate the effect of multi-wavelength spectrum, but also the effects of adjustable angles of
field-of-view, large range of adjustable optical power and adjustable deflection speeds of light noise in
space environment. We integrate these functions into a device with small and compact size for easily
mobile use. Software control function is also achieved via personal computer to adjust these functions
arbitrarily.
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