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Heating control of heated twin radiosonde humidity sensor based on DMC

Sun N., Zhang Y., Zhang W, Cheng E., Liu Y.

Polish Maritime Research

2016

S 1

52--58

In order to effectively solve condensation and icing problems of radiosonde in low-temperature environment at high altitude, humidity sensor heated automatic alternately to remove pollution and improve the measurement accuracy. Heat experiments obtained the curve of rising temperature and responsible time on heated twin humidity sensor in normal temperature and pressure, by expanded responsible curve to obtain heated model of twin heated humidity sensor and by the analysis of heating model, use DMC and PID control for heating respectively. Simulation results show that the DMC control meets the practical requirements of measure at high altitude.

Coherent combination of laser radiations and fringe contrast ratios on far field patterns

Dou R., Shi X., Sun N., Chen J.

Optica Applicata

2008

Vol. 38, nr 2

459-468

Fourier optics method has been used to study the far field of coherently combined laser beams. And an explicit expression of the far field has been derived for the case when emitters are positioned on apexes of multiple regular polygons with a common center. The statistical influence of the relative phases between constituent waves has been investigated and an expression for the fringes contrast ratio has been deduced with the aid of Ergodic hypothesis.