查询词典 geometrical optics

The plasma ignition threshold of metal is got through experimental and numerical study. The vapour and plasma ignition times of the target are got based on the equation of heat conduction and cascade model. We suppose that the plasma is ignited when generations of new electrons are born in vapour generation time. The influence of temperature on the thermodynamics and optics parameters of material also have been considered in the model. The resulting theory has good agreement with the experiment and overseas report. A blade method to measure the laser spot is given in this paper with validation and error analysis. The plasma threshold of metals in atmosphere and water ambients both are diagnosed with the light deflection and piezoelectric transducer. A Q-switched pulsed Nd:YAG laser operating at infrared (1064nm), visible(532nm) and ultraviolet (355nm) wavelengths has been used. Al、Fe、Cu are used as targets and get a similar results with both method. Theoretical and experimental analyses are applied on the influence of wavelength on the threshold have been done, both of which have shown that the plasma threshold of metals decrease as the laser wavelength increases; The plasma threshold of metals are higher in water than in air and the pressure of the shock wave in water is five times higher than in air .

从热传导方程和雪崩电离机制出发，假设当电子增值210倍时，考虑了温度对材料热力学和光学参数的影响时，得到了气化和等离子体点燃的时间，利用该模型进行计算得到的结果与国内外报道及自行通过实验测得的阈值基本一致；提出了利用刀刃法测量激光光斑面积的方法，并通过实验进行了验证和误差分析；利用光偏转装置和压电换能器分别对空气和水中金属等离子体点燃阈值进行了实验诊断，激光器均为调Q－YAG激光器（波长1064nm，532nm，355nm，脉宽10ns），靶材分别为Al、Fe和Cu，两种测试方法得到的等离子体点燃阈值基本一致；本文从实验和理论计算两个方面讨论了波长对等离子体点燃阈值的影响，均得到了等离子体点燃阈值随著波长的增加而减小的结论；对空气中和水中不同环境下金属等离子体的点燃阈值进行了比较研究，得到了金属在水中的等离子体点燃阈值比空气中的大，且水中产生的冲击波的压强是空气中的5倍左右的结论。

As apertures of mini-optics are very small, it is hard to precisely measure such parameters by ordinary interferometers.

微小表面的特点是口径小，采用常规干涉仪对其表面的几何参数无法实施精确测量。

The Design, Manufacture and Test of the Aspheric Surface of Optics.

无光焦度校正器和单一反射镜组成的光学系统。

The Design, Manufacture and Test of the Aspheric Surface of Optics.

潘君骅。光学非球面的设计、加工及检验。

Design, manufacture and testing of aspheric optics［M］.

潘君骅。光学非球面的设计、加工与检验［M］。

Research on uncalibrated self-adaptive 3D reconstruction algorithm. For different or varible scene, the intrinsic and extrinsic parameters of camera may be required to modify, for example, change focus length for different depths, change aperture size for different light intensity, change the skew angle between optics axises of camera and projector for ideal viewfield, etc.

对于不同的或变化的场景，摄像机的内部参数与外部参数可能需要调整，如对于不同的光强需要调整光圈的大小，对于不同的景深需要调整焦距的长短，甚至需要调整摄像机的光轴与编码投影系统的光轴之间的倾角，以使采样范围正好落在被照明的范围内。

Laservision video disc player is a intensive technical product which com- bines the technology of laser,optics,precision machinery and electronic control.

激光电视是综合了激光、光学、精密机械、电子控制等多种先进技术的知识密集和技术密集型产品。

One of the most important applications for fiber optics is signal pro- cessing in frequency and time domains,except for their use in signal transmis- sion and sensing.

光纤除可用作传输、传感信号之外，一个特别重要的应用领域是频域和时域的信号处理。

By now In-Line sputter coaters from LEYBOLD OPTICS for transparent conductive oxides and metals enjoy an excellent reputation amongst established solar cell producers since they are also very productive and dependable stand-alone systems.

到如今，在有威信的太阳能电池生产商中，蕾宝光学公司提供的，在线溅射涂透明氧化导体和金属的涂料器有很好的信誉，这因为它们是能高效生产和运行可靠的独立系统

The wave phenomena and quantum characteristics of atom optics are discussedmainly in this paper.Especially,the coherences of atomic wave and observing methodsare studied systematically.

本论文主要研究原子光学中波动现象及量子效应，并且较为全面系统地研究了原子波的相干性及观察的方法。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48