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The backscattering signal, which arises from the pulsed laser traveling through water, has limited the lidar system sensitivity and underwater target contrast. The transmitted optical carrier is modulated to be ultrashort pulsed laser and it is effective to suppress the backscattering to adopt the coherent detection technology by identifying the modulation envelope. A nonstationary light field is formed in seawater by the ultrashort pulsed laser. The inherent relationship between the nonstationary light field formed by modulated lidar and the stationary light field formed by conventional lidar was discussed and the backscattering light model of the stationary light field for the ultrashort pulsed laser was proposed. The backscattering signal in modulated lidar system was processed and analyzed in the frequency domain on the basis of the model. 相似文献
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1相关标准条款解读
GB7588—2003《电梯制造与安装安全规范》中关于对重(或平衡重)限速器动作速度有如下相关规定。 相似文献
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以Pd-Ag合金为活性组分、Al2O3为载体的催化剂作为研究对象,运用量子力学理论和Monte Carlo方法对乙炔选择性加氢反应的催化机理进行探索性研究,得到Pd-Ag的分散状况与催化剂活性和选择性之间的关系。结果表明,助催化剂Ag的增加,使乙烯在催化剂表面的脱附能力增强,降低乙烯形成乙烷的可能性,从而增强乙炔加氢的选择性;计算得到在催化剂表面H2解离过程、乙炔以及乙烯加氢反应过程的活化能;乙炔选择性加氢最佳条件为:温度(70~80) ℃,氢气分压(0.03~0.04) MPa 相似文献
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SPAD单光子探测器SPICE电路模型的建立与仿真研究 总被引:2,自引:1,他引:1
在SPAD等效电路的基础上建立了简单实用的SPICE电路模型,并对SPAD四种基本的工作电路结构(被动淬灭、主动淬灭、门控模式和电容淬灭)进行了细致的仿真分析.仿真结果清晰的反映了四种电路各自的特性和优缺点,以及SPAD器件寄生参数对于电路性能的影响,得到了与实验基本一致结果.该电路模型可以直接应用于后续信号读出电路及前置放大电路系统的仿真设计,调节电路参数,优化电路性能,从而节省后续电路设计与制作的时间. 相似文献