共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
3.
本文简要介绍了绝热去磁降温的基本原理,并详细阐述了这一演示实验装置的设计思想和实验操作步骤.该实验装置结构简单,操作方便,便于在课堂演示绝热去磁效应.除此之外,它还可演示材料的顺磁和抗磁特性. 相似文献
4.
5.
彩色放大实验装置的配套小制作程怡乐(黄山市徽州师专245000)在彩色照片十分普及的今天,学生迫切需要了解彩色照片的扩印原理与方法.我们在开设了黑白印相放大实验后,又增开了彩色照片放大实验,效果比较满意.实验中,我们得益于一些花钱不多的小制作.现分述... 相似文献
6.
一、研制J95型He-Ne激光实验装置的基本思想和装置的特点激光实验中以He-Ne激光实验最为直接,最为简单,最为明了,能直观地了解激光是如何产生的,以及影响激光输出功率的种种因素.但在以往的一些He-Ne激光实验装置中,全套均是玻璃结构,因而存在许多难以克服的缺点,给教学带来诸多不便.例如:1.全套实验装置都是玻璃结构,组装十分复杂,必须有相当技术的玻璃工才能完成,而且一旦装成便不易挪动.2.激光实验装置工作一段时间后,需更换高纯He和Ne气、电离管、热偶管等重要部件,高真空阀门也时有损坏,但在玻璃结构的装置… 相似文献
7.
本文提出了一种在轨迹成型法加工光学零件磨床上实现脆性材料超精密磨削的微进给电控装置。试验表明,在轨迹成型法加工光学零件磨床上应用本装置对光学透镜进行磨削后,工件表面粗糙度可达Ra=0.02μm,能够达到光学零件精磨的粗糙度要求。 相似文献
8.
9.
不良导体热导率测量实验装置研究 总被引:1,自引:0,他引:1
不良导体热导率测量实验装置研究朱肖平(重庆后勤工程学院630042)在不良导体热导率测量时,主要误差来自对传热率或散热率的测得过程中,本文介绍新的实验装置研究,力求减少这类系统误差,使得测量结果稳定可靠,突出物理思想.图1为实验装置图,其中A为加热盘... 相似文献
10.
笔者在讲“简谐运动的图像”时感到描绘简谐运动图像的实验操作不够方便,描出的图像不便于分析,因而对实验装置进行了改进. 相似文献
11.
大功率窄脉冲半导体激光器主要光电性能参数为:输出峰值光功率、阈值电流、正向电压、上升时间、峰值波长、光谱半宽、半强度角.根据激光制导系统对大功率窄脉冲激光器参数的特殊测试要求,研制一种大功率窄脉冲激光器测试平台,将小型化大功率激励器功放模块、大范围可调DC-DC模块、信号源板、激光器座、光学准直镜集成在一个平台上,与峰值功率计、光谱仪、CCD摄像机等仪器配合,可测出大功率窄脉冲激光器的峰值功率、峰值波长及波长随温度变化的漂移特性、发光芯均匀性等参数.介绍了大功率窄脉冲激光器测试台的特点,并对测试结果作了论述. 相似文献
12.
P. A. Shchinnikov V. G. Tomilov D. S. Sinelnikov 《Thermophysics and Aeromechanics》2017,24(1):159-164
The article considers some aspects of the research methodology of micro heat power plants based on internal combustion engines with air cooling and cogeneration based on energy balance equations and the laws of heat transfer. The research is conducted for such a setup based on the Hitachi internal combustion engine with 2.4 kW capacity. It has shown the efficiency of cogeneration use in the form of useful heat flow from air, cooling the cylinder head, with its further heating by utilizing the heat of flue gases in an additional plate heat exchanger. It has been shown that the cogeneration can save fuel costs 3–10 times compared with heat guns, depending on the duration of the setup use. 相似文献
13.
14.
15.
S. V. Siparov 《Optics and Spectroscopy》2002,92(2):263-266
Nonreciprocal effects in the acousto-optical interaction in gyrotropic cubic crystals with electroinduced anisotropy are studied. It is shown that the presence of optical gyrotropy leads to the doubling of the number of peaks of amplitude nonreciprocity, whereas an external electric field causes their shift and enhancement. It is found that the direction of lasing in a ring laser can be reversed by changing the direction of the control field. The results obtained can be used for the development and optimization of polarization-and electro-controlled acousto-optical nonreciprocal elements on the basis of cubic gyrotropic crystals. 相似文献
16.
An automated irradiation setup for biology samples has been built at Inter University Accelerator Centre (IUAC), New Delhi, India. It can automatically load and unload 20 biology samples in a run of experiment. It takes about 20 min [2% of the cell doubling time] to irradiate all the 20 samples. Cell doubling time is the time taken by the cells (kept in the medium) to grow double in numbers. The cells in the samples keep growing during entire of the experiment. The fluence irradiated to the samples is measured with two silicon surface barrier detectors. Tests show that the uniformity of fluence and dose of heavy ions reaches to 2% at the sample area in diameter of 40 mm. The accuracy of mean fluence at the center of the target area is within 1%. The irradiation setup can be used to the studies of radiation therapy, radiation dosimetry and molecular biology at the heavy ion accelerator. 相似文献
17.
18.
T. Lévèque L. Antoni-Micollier B. Faure J. Berthon 《Applied physics. B, Lasers and optics》2014,116(4):997-1004
We present the complete characterization of a laser setup for rubidium cooling dedicated to space applications. The experimental setup is realized with commercial off-the-shelf fiber components suitable for space applications. By frequency doubling two fiber laser diodes at 1560 nm, we produce the two optical frequencies at 780 nm required for atomic cooling of 87Rb. The first laser is locked on saturated absorption signal and long-term frequency drift has been canceled using a digital integrator. The optical frequency of the second laser is controlled relatively to the first one by a frequency comparison method. A full characterization of the setup, including frequency stability evaluation and frequency noise measurement, has been performed. The optical frequency doubling module has been submitted to environmental tests to verify its compatibility with space applications. 相似文献
19.
D. Cano H. Hattermann B. Kasch C. Zimmermann R. Kleiner D. Koelle J. Fortágh 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,63(1):17-23
We describe an experimental system that integrates the techniques for producing ultracold
atomic gases with the techniques for cooling solid bodies to cryogenic temperatures.
Ultracold clouds of 87Rb are prepared in a trap setup based on room-temperature
coils and subsequently transported to a superconducting microstructure by means of optical
tweezers. The superconducting microstructure generates a magnetic microtrap and is cooled
by a helium-flow cryostat that can achieve temperatures down to 2 K. Both the
room-temperature trap setup and the superconducting microtrap are installed in the same
ultra-high-vacuum chamber. The presented system is well suited to create hybrid quantum
systems by combining ultracold atomic gases and superconducting devices. 相似文献