排序方式: 共有13条查询结果,搜索用时 15 毫秒
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Cu2ZnSn(S, Se)4 (CZTSSe) thin films were deposited on flexible substrates by three evaporation processes at high temperature. The chemical compositions, microstructures and crystal phases of the CZTSSe thin films were respectively characterized by inductively coupled plasma optical emission spectrometer (ICP-OES), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman scattering spectrum. The results show that the single-step evaporation method at high temperature yields CZTSSe thin films with nearly pure phase and high Sn-related phases. The elemental ratios of Cu/(Zn+Sn)=1.00 and Zn/Sn=1.03 are close to the characteristics of stoichiometric CZTSSe. There is the smooth and uniform crystalline at the surface and large grain size at the cross section for the films, and no other phases exist in the film by XRD and Raman shift measurement. The films are no more with the Sn-related phase deficiency. 相似文献
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激光光斑质量对基于PSD的激光三角法长时间连续测量精度的影响 总被引:2,自引:0,他引:2
为了提高半导体激光器-位置敏感器件(LD-PSD)激光三角法测距、测厚系统的测量精度,对半导体激光器的光斑质量进行了研究。用不同功率的半导体激光器做静态测距实验,结果表明,在长时间连续测量中,激光光斑重心的漂移增大了系统的测量误差。光斑重心漂移主要是由光斑的高频噪声和光斑整体偏移造成的。针对这两方面因素设计了基于针孔滤波和棱镜分束的能够提高激光光斑质量的光学系统,并用CODEV软件进行了优化与仿真。将所设计的光学系统加入到测距仪中重新进行静态测距实验,结果表明,改善后的系统精确度由25μm提高到8μm,使得基于位置敏感器件的激光三角法测距、测厚系统在长时间连续工作时也能保持较高的测量精度。 相似文献
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随着现代科学技术的进步和社会的发展,传统的测量系统已不能适应现代社会的发展和现代计量要求的需要,特别是传统计量系统存在产生误差的因素多、管理和使用不便等不足,限制了它的发展和应用。因此,推广使用新型的天然气微机自动计量系统显得极为重要。 相似文献
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热轧薄板测量系统中激光波长的优选 总被引:1,自引:0,他引:1
研究了绿光、红光和红外光激光光源和热轧薄板干扰光对热轧薄板厚度测量的影响.利用电炉加热Cu薄片模拟生产现场热轧薄板环境,采用双光路激光三角法,在基于位置敏感器件(PSD)的调制光源和非调制光源的两种测量系统上,分别选用不同激光光源对热轧薄板厚度进行测量.实验结果表明,在两种测量系统中,测量精度均受到了热轧薄板干扰光的很... 相似文献
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An in-line Mach-Zehnder interferometer (MZI) for simultaneous measurement of temperature and refractive index (RI) is proposed and demonstrated. The sensor is composed of cleaved taper, single-mode fiber (SMF) and spherical structure. Using precision device to measure the position of waist, the cleaved taper structure is obtained by cutting the taper structure. The sensitivities of the temperature are 0.052 nm/ oC and 0.037 nm/ oC in the temperature range of 25—70 oC, respectively. The RI sensitivities are ?56.59 nm/RIU and ?43.53 nm/RIU in the RI range of 1.335—1.38, respectively. This sensor has many advantages such as compact structure and good stability. 相似文献
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提出了一个基于级联多模布拉格光栅和新型的高精细度滤波器的可调谐双波长窄线宽掺铒光纤激光器的结构。环形滤波器由两个耦合器和一段经过泵浦的掺铒光纤组成,由于掺铒光纤产生增益,滤波器产生高精细度的频率响应,能够滤掉掺铒光纤激光器的不需要的纵模,从而起到窄化激光器线宽的作用。实验过程中,由多模光栅的选频特性产生六种窄线宽双波长的组合,激光器的线宽由不加滤波器的0.14~0.16 nm 被压窄窄化到0.05 nm。 相似文献