THz无线通信系统高定向光学发射器性能分析

为提高太赫兹无线通信系统的传输距离,设计了带有高增益天线和波导输出光电二极管模块的光学发射器。分析了含有HEMT和不含HEMT的WG-PM输出功率与光电流、输出功率与信号频率的关系,对比了四种光学发射器的BER特性,理论计算了发射器的最大传输距离。分析结果显示:该WG-PM在120GHz时的3dB带宽大于16GHz,采用此发射器的无线通信系统传输距离可达到500m。

Multispectral thermometry based on neural network

In order to overcome the effect of the assumption between emissivity and wavelength on the measurement of true temperature and spectral emissivity for most engineering materials, a neural network based method is proposed for data processing while a blackbody furnace and three optical filters with known spectral transmittance curves were used to make up a true target. The experimental results show that the calculated temperatures are in good agreement with the temperature of the blackbody furnace, and the calculated spectral emissivity curves are in good agreement with the spectral transmittance curves of the filters. The method proposed has been proved to be an effective method for solving the problem of true temperature and emissivity measurement, and it can overcome the effect of the assumption between emissivity and wavelength on the measurement of true temperature and spectral emissivity for most engineering materials.

音乐立方块

把这些立方体放在一块儿，并且移动它们，信号处理器就能够进行网络工作。于是产生不同的乐声。人们就可以通过变化它们的位置．来感受乐声的奇妙产生，并且采用一种全新的方式作曲。