For the laser coordinate measuring machine, the single CCD and the structure light are used to match the 3D object surface data. A new ladder-shaped calibration block is designed and two images are taken: one is structured stripe image and the other is laser plane image by this block. The laser plane and camera calibration can be accomplished by both images.

由于關(guān)節(jié)式坐標(biāo)測量機(jī)的激光測量頭国产级特妇黄A片，使用單攝像機(jī)和線結(jié)構(gòu)光來匹配被測物體表面的三維數(shù)據(jù)，本文設(shè)計了一種新型的階梯形標(biāo)定塊黄色大片一级片，通過標(biāo)定塊圖像和激光條紋圖像完成了攝像機(jī)的內(nèi)外參數(shù)標(biāo)定和激光平面參數(shù)標(biāo)定91网站在线观看国产一区。

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 210 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网友自拍另类重口日韩AV、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.

從熱傳導(dǎo)方程和雪崩電離機(jī)制出發(fā)男女內交网站在线观看，假設(shè)當(dāng)電子增值2~(10)倍時，考慮了溫度對材料熱力學(xué)和光學(xué)參數(shù)的影響時男人扒女人添高潮视频动态，得到了氣化和等離子體點燃的時間深夜福利爱爱视频，利用該模型進(jìn)行計算得到的結(jié)果與國內(nèi)外報道及自行通過實驗測得的閾值基本一致；提出了利用刀刃法測量激光光斑面積的方法丁香花高清在线观看，并通過實驗進(jìn)行了驗證和誤差分析黄色操屄；利用光偏轉(zhuǎn)裝置和壓電換能器分別對空氣和水中金屬等離子體點燃閾值進(jìn)行了實驗診斷，激光器均為調(diào)Q—YAG激光器(波長1064nm日本三级片网黄色，532nm日韩亚洲欧美，355nm，脈寬10ns)天美三级片网站，靶材分別為Al99riAV欧美gif、Fe和Cu，兩種測試方法得到的等離子體點燃閾值基本一致欧美人人做人人爱视频；本文從實驗和理論計算兩個方面討論了波長對等離子體點燃閾值的影響色呦呦网站直接看的，均得到了等離子體點燃閾值隨著波長的增加而減小的結(jié)論；對空氣中和水中不同環(huán)境下金屬等離子體的點燃閾值進(jìn)行了比較研究www.无码在线，得到了金屬在水中的等離子體點燃閾值比空氣中的大美女的隐私秘免费视频网，且水中產(chǎn)生的沖擊波的壓強是空氣中的5倍左右的結(jié)論。

A numerical model was established by combining the seven-flux model of light propagation with the two-dimensional hyperbolic heat conduction model in cylindrical coordinates. It showed that there exists a great discrepancy between the results obtained by treating the laser irradiation as volumetric absorption (i.e. taking laser scattering and absorption into consideration) and those obtained by treating the laser irradiation as the second boundary condition.

將激光傳輸?shù)钠吡髂Ｐ团c圓柱坐標(biāo)系內(nèi)的二維雙曲型導(dǎo)熱模型相結(jié)合建立了理論模型国产产一区二区三区久久毛片最强；將激光照射處理為容積吸收(即考慮激光在生物組織中的散射和吸收)所得到的計算結(jié)果国产成人综合亚洲，與將激光照射處理為第二類傳熱邊界條件所得到的計算結(jié)果相比，兩者差別很大人人操人人草人人草人人叉人；考察了激光照射下散射系數(shù)和吸收系數(shù)對生物組織內(nèi)雙曲型導(dǎo)熱的影響caoporon。

An oxygen-bubble and white-light speckle velocimetry method is presented.Instead ofpulsed laser and commonly used particle,a sheet like-bubble mass generated from anade wire byeletrolysing water is used as particle tracer,a white light flash set controlled by digital time delaycircuit is used as double pulsed light source,and 2-D velocity distribution in a sectional planewithin flow field can be obtained without using light sheet technique.

提出了一種氧氣泡粒子白光散斑測速技術(shù)，與以往散斑測速方法不同的是，采用電解水時電解陽極絲上產(chǎn)生的氧氣泡做為流場示蹤粒子日韩免费午夜毛片视频，用兩個閃光時間間隔由數(shù)字延時電路控制的普通閃光燈做為散斑底片拍攝時的雙脈沖光源一级无码奶水，并且勿需片光技術(shù)，即可獲得流場內(nèi)部一個截面上的二維速度分布久久久久久AV无码免费网站动漫。

The study results indicate that as emission power increases, the peak power density on the section of a certain distance will increase firstly, then it will descend and that the peak light intensity on the section will increase with the increasing of spot radius of basic mode Gaussian beam. As the propagation distance increases, the peak light intensity on the section will descend gradually, and the laser energy will spread. The light intensity distribution exhibits straw hat shape on a certain conditions, in other word to say, the central light intensity is less than acroteric light intensity.

結(jié)果表明国产乱人伦偷精品视频免费看，無風(fēng)穩(wěn)態(tài)熱暈效應(yīng)存在時，隨發(fā)射功率的增大二色aⅴ国产热，一定傳輸距離截面上的峰值功率密度先增人后減衋v激情网站。唤孛嫔系姆逯倒鈴婋S基模高斯光束的腰斑半徑的增大而增大免费一级A片视频播放欧美；隨著傳輸距離的增大9啪在线，截面上峰值光強在逐漸減小，能量在逐漸向周圍擴(kuò)展在线性国日韩；在一定條件下啪啪啪黄色网站，截面上的光強分布會呈現(xiàn)中心光強小于周圍光強的&草帽型&分布。

When laser diode illuminates the rough surface moving transversally across the light beam, the feedback light forms the random speckle due to the random pattern of the target surface, causing random fluctuations in the laser output, which is called as self-mixing speckle interference.

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We gained 3.3W green laser when we pumped the system at 25W power while the temperature of Nd: YVO4 was controlled at 22℃, LBO was at 18℃, the efficiency of light-light reached 14.3%, and the conclusion nearly come to the same thing with the theory, this result is better than the need to gain 3W green laser of industrialization, and surpasses it 10 percentage.

使Nd∶YVO_4晶體的溫度控制在22℃色秀视频a8a6com、LBO的溫度控制在18℃国产精品老女人精品视频，整個系統(tǒng)在泵浦光功率為25W的情況下，獲得了3.3W的綠光輸出黄片A片三级aa黄，光-光轉(zhuǎn)換效率為14.3％免看一级a一片日韩A片，實驗結(jié)果與理論預(yù)期基本相符，比產(chǎn)業(yè)化項目的目標(biāo)要求—綠光輸出3W高出10個百分點a级黄片一级。

To suppress the noise which caused by the fuzzy character of XLPE sample, the size of the photodetector was determined based on the analysis of the light intensity distribution in the spatial frequency plane when the laser beam passing through the sample was collected by lens. A series of detectors were designed to eliminate the time response decreasing effect caused by the increasing of the detector size. The developed laser system could resolve defects of 40 um diameter in XLPE tape with the 120um diameter and 400Hz scanning laser beam. after above results was used.

為了消除由于XLPE材料光彌散效應(yīng)引起的信號噪聲對信號幅度測量的影響和提高測試速度日韩黄色视频品爱，研制了陣列組合式光電探測器，理論分析和實驗驗證都證明了該探測器有較好的頻響特性和較低的噪聲水平99热W亚洲精品国产99，應(yīng)用這兩項成果組成的信號系統(tǒng)及微機(jī)數(shù)據(jù)采集電路可在400Hz掃描頻率下18禁片免费网站在线看，掃描寬度所限制的120μm光束直徑下獲得40μm的測量分辨率。

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男人的天堂av社区在线、Fe三级绝黄A片在免费线观看欧美、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 .

從熱傳導(dǎo)方程和雪崩電離機(jī)制出發(fā)，假設(shè)當(dāng)電子增值210倍時国语自产免费精品视频在，考慮了溫度對材料熱力學(xué)和光學(xué)參數(shù)的影響時全国最新的黄色视频播放久了爽爽，得到了氣化和等離子體點燃的時間，利用該模型進(jìn)行計算得到的結(jié)果與國內(nèi)外報道及自行通過實驗測得的閾值基本一致亚洲黄色站；提出了利用刀刃法測量激光光斑面積的方法四川三级自中文字幕亚洲，并通過實驗進(jìn)行了驗證和誤差分析；利用光偏轉(zhuǎn)裝置和壓電換能器分別對空氣和水中金屬等離子體點燃閾值進(jìn)行了實驗診斷，激光器均為調(diào)Q－YAG激光器（波長1064nm外国A级片，532nm谁有黄色网站视频看，355nm，脈寬10ns）亚洲欧美导航，靶材分別為Al精品丝袜国产在线精品不卡、Fe和Cu，兩種測試方法得到的等離子體點燃閾值基本一致天天摸天天；本文從實驗和理論計算兩個方面討論了波長對等離子體點燃閾值的影響免费观看黄网站不卡影院视频，均得到了等離子體點燃閾值隨著波長的增加而減小的結(jié)論；對空氣中和水中不同環(huán)境下金屬等離子體的點燃閾值進(jìn)行了比較研究国产激情无码aⅴ视频，得到了金屬在水中的等離子體點燃閾值比空氣中的大香港性爱视频一区二区三区，且水中產(chǎn)生的沖擊波的壓強是空氣中的5倍左右的結(jié)論。

Exhibition hall is divided into four, nine galleries, one of electric and magnetic layer for the area, power and machinery area, math section, the universe and Space Pavilion, set up a high-voltage discharge, electric magnetic Gallery, bowls, a typical mechanical transmission, three-dimensional coordinates and other exhibits; the second floor for the sound and light booth, Applied Technology Pavilion, set up a light display, three-dimensional holographic images, sound simulation, laser laser, simulated driving and other exhibits; three for the Life and Health Pavilion, set up a false impression cylinder, fitness tests, brain and facial features, body systems, such as exhibits; underground floor for temporary exhibitions; in the Office of the Hebei Academy of Sciences set up a pavilion style.

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