Chen Lie-zun

Approximate analytical expressions of apertured broadband beams in the far field

The approximate analytical expressions of the apertured broadband beams in the far field with Gaussian and Laguerre-Gaussian spatial modes are presented.For the radially polarized Laguerre-Gaussian beam,the result reveals that the electromagnetic field in the far field is transverse magnetic.The influences of bandwidth(Γ) and truncation parameter(C 0) on the transverse intensity distribution of the Gaussian beam and on the energy flux distribution of radially polarized Laguerre-Gaussian beam are analysed.The approximate analytical expressions of the apertured broadband beams in the far field with Gaussian and Laguerre—Gaussian spatial modes are presented. For the radially polarized Laguerre—Gaussian beam, the result reveals that the electromagnetic field in the far field is transverse magnetic. The influences of bandwidth (Γ) and truncation parameter (C0) on the transverse intensity distribution of the Gaussian beam and on the energy flux distribution of radially polarized Laguerre—Gaussian beam are analysed.

Truth-flowing fuzzy control algorithm and its application in temperature control system

A kind of product-truth-flowing fuzzy control algorithm is presented in this paper. Firstly, the steps of the algorithm are listed in detail. The algorithm holds advantage that fuzzy reasoning process is intuitionistic and its computation is simple. Secondly, based on the algorithm, a constant-temperature control system is designed with MAX7651 MCU, Pt100, MOC3041. Finally, practical control result shows that the performance of control system is excellent, its rise-time is about 21 minutes, the overshot of temperature is only 0.4 degC, and real-time temperature waves between -0.3degC and +0.3degC at expectation value.