光束

In chapter 2, based on analysis for the existed methods of torsional vibration measurement, a novel measuring method, parallelling dual-beam laser doppler torsional vibration measurement is first put forward by the author, it not only divides translation and rotation of the rotor, but also can be used to measure torsional vibration of non-cylinder rotor.

本文的第二章在分析现有扭转振动测量方法的基础上，首次提出平行双光束激光多普勒扭转振动测量方法，它不仅解决了转子平动与转动的完全分离，还能测量各种非圆形截面转子的扭转振动；为辨别转子的转动方向，还提出双频激光多普勒测振仪，满足故障诊断对测量启、停转子和转速方向变化转子性能的要求。

Laser beam quality quantifies the space behavior.

激光束的光束质量是其空间特性的量化反映。

Spectra of I_2 in benzene solution shows that Raman scatting light intensity is increased gradually as scattering distance is increased, in the scattering process it is accumulated and it is getting stronger and stronger.

苯溶液的I_2拉曼光谱，表明在液芯光纤内产生的拉曼散射光谱的强度是随着激发光束在介质中作用距离的增加而增强的，拉曼散射光在光纤的传播中不断累积得以增强。

In this technique, light is passed through clouds of sodium atoms which have been supercooled to almost absolute zero.

在这个技巧中，科学家让光束通过一团被超冷却至接近绝对零度的钠原子云。

Common lifetime measurement methods for minority carrier of crystalline silicon and crystalline silicon solar cells were introduced, including microwave photoconductivity decay, quasi-steady state photo-conductance, surface photoelectric voltage, infrared carrier density imaging, modulation free-carrier absorption and laser beam-induced current microscopy.

分别介绍了常用的测量晶体硅和晶体硅太阳电池少子寿命的各种方法，包括微波光电导衰减法，准稳态光电导方法，表面光电压，IR浓度载流子浓度成像，调制自由载流子吸收和光束诱导电流，并指出了各种方法的优点和不足。

Equipment ability: imported portable testing equipments, 1027-radon detector, CO infrared analyzer, cp 3800, TSP-large flow PM10 sampler, UV8500 double beam UV-visible spectrophotometer, air sampling device, laser dust particle counter, hot-anemometer, air particle counter, Stone and other radioactive detector.

设备能力：测氡仪、CO红外分析仪、气相色谱仪、TSP-PM10大流量采样器、双光束紫外可见分光光度计、大气采样器、浮游微生物采样器、激光尘埃粒子计数器、热球风速计、空气粒子计数器、石材放射性检测仪等。

Thermal effect of laser windows on the beam divergent angle.

激光窗口热效应对光束发散角的影响。

Beam divergent angle and receiving aperture are the key parameters of free space optical communication equipment.

光束发散角和接收口径是大气激光通信机设计的主要参数。

Beam angle range from 25°to 43°adjustable.

光束角度可在于25°—43°之间随意调节，达到不同角度效果。

The influence of the one-stage single-lens optical system on the divergence angle of Gaussian laser beam is analyzed theoretically.

在理论上分析了单级单透镜光学系统对激光高斯光束发散角的影响。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。