As an essential fruit rich in nutrients, the sugar content of apple is the most concerned quality feature. However, it is difficult to take into account the multiple requirements of low value, portable and nondestructive testing, no matter the traditional sampling method or spectrograph method. Therefore, this paper developed a non-destructive testing system for apple sugar content based on smart phone. After measurement, the Root Mean Square Error (RMSEP) of the prediction set of the system on the Red Fuji sample reaches 0.8%Brix, indicating that the developed system has a high measuring accuracy. The research results have accumulated the engineering practice foundation for the development of commercial nondestructive testing spectrometer with high sensitivity, easy to carry and light weight.
KEYWORDS: Telecommunications, Laser communications, Signal detection, Laser systems engineering, Satellites, Signal processing, Optical communications, Process modeling, Visualization, Optical simulations
For an optical satellite link, the error sources that influence the pointing accuracy of the terminals include the attitude estimation error, ephemeris accuracy, and the boresight alignment error. It means an uncertainty cone (UC) exists for the spatial acquisition process. The acquisition process is a continuous adjustment for the visual axis of the two communication terminals, to enable them to detect the light signal from the other end, and finally realize the light closed loop. Beaconless acquisition algorithm and the corresponding acquisition process, modeling for spiral scan pattern and the simulation results of staring-scanning mode are presented. The UC scan range is 5 mrad, through the overlap with a spot divergence angle of 80 μrad, the total acquisition time is 98 s.
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