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 Wysłany: Wto 23:11, 21 Gru 2010 Temat postu: ugg milano Measurement of ultrasonic beam molecula |
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Measurement of ultrasonic beam molecular beam
Injection on the tailgate show the left and right two pixels, which the left and right block hole right on the spot along the left and right sides, a {/ prince Yu 7 optical measurement principle of a nozzle ring n c one accurate hole collimator imaging a spot at the location of a baffle and inner circle and along the tangent. Figure 8. Figure 8 (c) can be seen up and down the four spot position asymmetry, and symmetrical, composed of the four garden spot diameter D-shaped cross-section from top to bottom about 7.5ram, D left and right about 9.0ram. This shows that the system of the molecular beam diameter at the bezel at the maximum should be less than 9.0ram, the minimum should be not less than 7.5ram, while the real guillotine is 8.5 ~ 8.6ram. In good agreement with this range. Optical measurement process and the results also shows the measured shape of the curve and down a slight asymmetry causes. Know from Figure 7, the guard, the position of the laser spot by the same position in the case of the nozzle from the collimator shape and location decisions, and therefore the composition of the cross section beam reflects the collimator shape and assembly situation. Figure 8 (c) that the collimator is not enough processing park, on the P side bored slightly smaller, although the deviation is small (perhaps only 0.0 millimeters) can also cause the size of the bottom right to ask You, this is because the bezel location far away from the collimator (a few hundred mm) have resulted in significant amplification of the composition section of the bezel on the spot at the bottom to ask obvious asymmetry. From the collimator The role of molecular beam, precisely because of this irregular collimator hole alignment will make the cut along the bar too much gas molecules, the actual molecules in Cambodia through the ring after the collimator 8 and laser optics j dagger Cambodia spot distribution of a laser light path cycle a 'b a spot in the collimator pull a spot in the distribution of c baffle candle at the distribution board to form a flat shape as shown in Figure 9, Park-shaped beam spot cross section, which must lead to P ~ x measuring the shape of a slight curve down asymmetry. This tested not only from the values measured on the reliability and accuracy of the experimental curves from top to bottom reveals the asymmetric shape of the reason, but also illustrate the experimental test the sensitivity and accuracy compared with optical measurements wears. 3. Gas molecules in the distribution of the beam cross section: from the results (Table 6) and experimental curve (Figure 3,4,5) can be seen; �� beam diameter d00 2 ~ d8. Rights of the change is greater than dB0 Rights ~ d6. Rights change} �� all experiments have demonstrated both ends of the curve changed gently, I asked some of the state of rapid change. This shows that the gas section of the beam intensity on the spot in the spring is not evenly distributed, but the central part of the larger edge of the 77 �� y Head 9 On the molecular beam measurements indicate most of the smaller open j-shaped. To prove this, we made a baffle block the move up and down with the tailgate area of the location X Kong Kaiqi change curve, and make compared with the experimental curve. Figure 10 shows the map file Kong Kaiqi area of the curve with x approximate straight unadorned, while the experimental curves are the upper and lower flat, only the middle part of the approximate straight line, but the slope of the curve is slightly larger than the area which reflects the experimental curve shows area is not blocked Kong Kaiqi eyelashes variation of x but the molecular beam intensity of baffle stream cross section Cambodia I (X, Y) along the x side of the distribution of Q, which confirms this structure produced by molecular beam source system molecular beam divergence is small,ugg prezzo, but concentrated in the vicinity of the axis. Figure 10 on the bezel, the next shift, S and X block Kong Kaiqi area curve and the molecular beam pressure P and x is the music curves of Figure VI, some conclusions 1. The baffle can be detected by starting a high intensity ultrasound beam molecular beam diameter is feasible, effective,air jordan shoes cheap, and the result is reliable; 2. Gas molecules in the Cambodian section of the distribution of spots concentrated in the vicinity of the axis to change more obvious at d80%, d80% and therefore the molecular beam diameter of the description of Cambodia more effective, reasonable, and can be called for the effective beam diameter, the specific calculation method, see equation (7) and Figure 3,4,5. 3. In the same temperature, the beam spot diameter on the size and gas type, there is increasing with the gas molecular weight of the trend of smaller, but no significant relationship between high into the air. References (1] s.L. Bernaseketal, Prog.Surf. Sci.5, No.4 (1975) 377 (2) Xi Guang Hong, Vacuum Science and Technology, Volume 1,6 of (1981) 385 (3] s. T. Cyeretal,air jordans, Ann.Rev.Phys.Chem.28 (1977) 477 (4] L. Valyi, Atom & IonSources (1977) 84 (5] Wang Junrong, Vacuum Science and Technology,ed hardy clothing, Volume 2,6 of (1982j347 (6] Li Shenglin really give an example science and technology, Lane 4,5 of (1984) at9 �� 78 ��
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