共查询到20条相似文献,搜索用时 35 毫秒
1.
Hyundeok Im Kwang Hwan Oh Soo Geun Kim Sungho Jeong 《International Journal of Precision Engineering and Manufacturing》2009,10(4):101-105
A laser micromachining technique that employs etchant jet for thermochemical wet etching of metallic channels is introduced.
In this method, the etchant supplies chemicals for thermochemical reaction and laser beam delivered through an optical fiber
provides the thermal energy. For the generation of etchant jet, a nozzle with a gap control function is utilized. By using
this method, microchannels with a triangular cross-sectional profile and a depth ranging from 100 to 300 μm and a width ranging
from 100 to 200 μm are fabricated on stainless steel 304. Since the etchant is supplied in the form of a liquid jet, it is
expected that this technique can be applied for the fabrication of microchannels on industry scale workpiece. The variation
of channel size and shape with respect to process parameters is examined. Also, the potential application to the fabrication
of metallic microchannels with high-aspect-ratio is investigated. 相似文献
2.
Hyun Myung Shin Hae Woon Choi Soon Dong Kim 《The International Journal of Advanced Manufacturing Technology》2010,46(9-12):1001-1008
A novel hybrid process [LASER?+?computer numerical control (CNC) machining] is used to fabricate a linear motion guide. A 20-W pulsed fiber laser and a three-axis CNC machining center were combined to fabricate microscale lubrication grooves on a 5-mm wide linear guide contact surface made of SCM-440H material. Ablation fabrication speed was increased up to 1,000 mm/min (or 16.7 mm/s) with a great ablation quality without any tool wear. The mean values of patterned sizes of lubrication grooves were measured to be between 40 and 80?μm in width and between 150 and 275?μm in depth with a laser pulse repetition of 25 kHz. A specially designed optical device was compact enough to be installed on CNC machine. It was mounted on the CNC spindle and proved to be flexible enough to deliver the laser beam on to the work piece. The microscale ablation quality of the surface was of sufficient quality to be adopted on most linear motion related applications. 相似文献
3.
In order to fabricate microgrooves on a curved surface, the curved surface was measured with a confocal system and then it was used for laser microprocessing. This paper proposes a new method of using a pulse laser for the confocal system to measure the curved surface. It also compares the conventional way of using a continuous laser and a new way of using the pulse laser with the confocal system. Using the data measured with the pulse laser for fabrication, microgrooves were fabricated on a curved surface. The width of the fabricated microgroove was 10 μm and the depth was 27 μm. The microgroove fabricated on a curved surface as a part of this study can be used in injection molding to manufacture a micropatterned plastic surface at a low cost. This plastic surface can be applied for a superhydrophobic surface, a self-cleaning surface, or a biochip. 相似文献
4.
Squires MB Stickney JA Carlson EJ Baker PM Buchwald WR Wentzell S Miller SM 《The Review of scientific instruments》2011,82(2):023101
We present the use of direct bonded copper (DBC) for the straightforward fabrication of high power atom chips. Atom chips using DBC have several benefits: excellent copper/substrate adhesion, high purity, thick (>100?μm) copper layers, high substrate thermal conductivity, high aspect ratio wires, the potential for rapid (<8 h) fabrication, and three-dimensional atom chip structures. Two mask options for DBC atom chip fabrication are presented, as well as two methods for etching wire patterns into the copper layer. A test chip, able to support 100 A of current for 2 s without failing, is used to determine the thermal impedance of the DBC. An assembly using two DBC atom chips is used to magnetically trap laser cooled (87)Rb atoms. The wire aspect ratio that optimizes the magnetic field gradient as a function of power dissipation is determined to be 0.84:1 (height:width). 相似文献
5.
为了研究水导激光加工关键工艺参数对碳纤维增强复合材料(CFRP)沟槽截面形貌与热影响区的影响,利用水导激光加工设备设计单因素实验探究了激光功率、水射流压力、进给速度及激光重复频率四个关键工艺参数对沟槽截面形貌以及热影响区的影响规律,分析了沟槽截面形貌和热影响区形成机理。实验结果表明:激光功率对沟槽烧蚀深度和热影响区的影响最大,水射流压力对沟槽烧蚀宽度的影响最大,进给速度和激光重复频率对沟槽烧蚀深度和宽度的影响不大,对热影响区有较大影响。此外,发现沟槽截面去除区呈V字形,热影响区呈锯齿形状。通过单因素方法分析得到了较好的沟槽截面形貌,其沟槽截面烧蚀深度为772.8μm,烧蚀宽度为897.7μm,铺设方向为90°的碳纤维层热影响区为326.5μm,铺设方向为0°的碳纤维层热影响区为102.4μm。 相似文献
6.
High aspect ratio (HAR) micro-grooves are of great significance for vacuum electronic devices. However, the fabrication of HAR micro-groove on oxygen-free copper remains challenge since the high surface quality is hard to achieve. Aiming to improve the surface quality, a hybrid and successive method, obtained by combining nanosecond laser and micro-milling (NLMM), was presented. The nanosecond laser achieves the maximum workpiece removal rate, while the subsequent micro-milling provides the desired machining quality. Compared to one-way full slot micro-milling (FSMM), the presented manufacturing method (NLMM) could improve the surface quality, namely the top burr formation and the bottom and sidewall surface roughness. Furthermore, the NLMM displayed a lower tool wear rate compared to FSMM. Finally, a desired S-shaped groove with an aspect ratio of 2.5, a width of 0.2 mm, and the cycle number of 30 was successfully fabricated. The study offers a promising aspect for improving the HAR micro-groove fabrication quality. 相似文献
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8.
采用硅V型槽的一维光纤阵列的研制 总被引:3,自引:0,他引:3
阐述了一维光纤阵列的研制方法,分析了V型槽法中硅V型槽腐蚀机理,计算了V型槽的开口及间距与光纤半径及纤芯截面圆心距的关系,给出了最小槽深与光纤半径及V型槽开口的关系式。用各向异性腐蚀技术制作了硅V型槽,比较了紫外及红外粘接剂的性能,进行了光纤的排列、粘接及抛光,制作出一维光纤阵列。用原子力显微镜测量光纤阵列表面粗糙度为纳米量级,用ZYGO数字干涉仪检测光纤的端头位置误差为3~5 μm。该项工作为二维光纤阵列的高精度制备奠定了基础。 相似文献
9.
准分子激光刻蚀技术在微机械中的应用研究 总被引:6,自引:1,他引:5
准分子激光刻蚀技术在微机械领域有着十分广泛的应用前景,用该技术制作的聚合物微结构深宽比大、精度高,并且工艺简单。我们分析了准分子激光刻蚀原理,探索了这种技术的工艺方法和技术条件,特别对掩膜的结构和制作工艺进行了较为深入的研究。本文采用简易的实验装置,用自行研制的三种结构掩膜进行了准分子激光刻蚀实验,得到了50μm 深的聚合物材料微机械构件。 相似文献
10.
Porous copper surfaces show their great merits in the applications of chemical reaction, sound absorption and heat transfer. In this study, a laser micromilling method is proposed to fabricate porous surfaces with homogeneous micro-holes and cavities of the size about 1–15 μm on pure copper plates in a one-step process. The laser micromilling was performed by a pulsed fiber laser via the multiple–pass reciprocating scanning strategy. Based on the measurement of scanning electron microscope (SEM) and 3D laser scanning confocal microscope, the formation of surface structures was investigated together with the laser ablation mechanisms. The effects of laser processing parameters, i.e., laser fluence, scanning speed, number of scanning cycles and scanning interval, on the formation and surface morphology of porous surfaces were systematically assessed. Furthermore, the wettability of the porous copper surfaces was also evaluated by measuring the static contact angle of water. The results showed that the laser fluence played the most significant role on the formation of porous copper surfaces. The average depth and surface roughness of porous copper surfaces increased with increasing the laser fluence and number of scanning cycles while decreased with the increase in scanning interval. The scanning speed played little influence on the formation of porous copper surfaces. These results can be closely related to the variation of energy density and re-melting process during the laser micromilling process. Moreover, all the copper porous surfaces were found to be hydrophobic. The contact angle of porous copper surfaces was significantly dependent on laser fluence, but weakly affected by the scanning speed and number of scanning cycles. 相似文献
11.
S. A. Batishche A. A. Kouzmouk G. A. Tatur 《Instruments and Experimental Techniques》2011,54(1):114-117
An optical scheme and design of a YAG:Nd3+ frequency laser with a two-pass amplifier and a mirror with the phase conjugation by the stimulated Brillouin scattering
in an optical fiber is described. The maximal radiation energy is 1000 mJ at a 1.064-μm fundamental wavelength and 500, 200,
and 20 mJ at the second, fourth, and fifth harmonics, respectively, when the divergence is ∼5 × 10−4 rad and the pulse duration is 4.5 ns. 相似文献
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13.
Sang-Mae Lee Kook-Chan Ahn Jim S. Sirkis 《Journal of Mechanical Science and Technology》2001,15(3):309-319
This paper demonstrates the development of optical temperature sensor based on the etched silica-based planar waveguide Bragg grating. Topics include design and fabrication of the etched planar waveguide Bragg grating optical temperature sensor. The typical bandwidth and reflectivity of the surface etched grating has been ∼0.2 nm and ∼9 %, respectively, at a wavelength of ∼1552 nm. The temperature-induced wavelength change is found to be slightly non-linear over ∼200 °C temperature range. Typically, the temperature-induced fractional Bragg wavelength shift measured in this experiment is 0.0132 nm/°C with linear curve fit. Theoretical models with nonlinear temperature effect for the grating response based on waveguide and plate deformation theories agree with experiments to within acceptable tolerance. 相似文献
14.
本文采用有限体积法建立了交叉型细胞分离模型,提出了一种基于光压差分的细胞筛选仿真方法,分析微流体中细胞筛选的影响因素。基于层流、流体流动粒子追踪、波动光学理论,利用有限元分析法建立了一种交叉型光学颗粒分离模型,研究了利用光压差分技术分离细胞的各种影响因素,其中包括微粒直径,激光功率、温度、光纤直径,分析了微粒在流体中因光辐射压力作用下的偏移距离。实验结果表明:在微流体中,激光功率、细胞直径、温度(20℃)和偏移距离大体上成正比关系,光纤直径和细胞直径在大小相当的情况下光辐射压力能够达到最大值,当激光通过光纤作用于直径分别为3,8和20μm的微粒时,光纤直径为7μm或8μm时光辐射压力最大,所以选用直径为8μm的单模光纤作为一个重要的实验光学器件。所得结论为深入研究细胞筛选影响因素的数值仿真精度提供了参考与借鉴。 相似文献
15.
《Measurement》2014
A subpixel edge location method based on orthogonal Jacobi–Fourier moments is proposed in this paper to improve the performance of optical fiber spherical coupling probe during dimensional measurement of micro-cavities with high aspect ratio. The effectiveness of the proposed method is proved through the performance test of a micro-hole measuring machine with optical spherical coupling probe. Test results indicate that a blind micro-hole of 400 μm in diameter can be experimentally measured at the depth of 2000 μm with a repeatability of 40 nm and an extremity resolution of 42 nm. 相似文献
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17.
在金属基底上制作高深宽比金属微光栅的方法 总被引:1,自引:0,他引:1
根据光学领域对高深宽比金属微器件的需求,利用UV-LIGA工艺在金属基底上制作了具有高深宽比的金属微光栅。采用分层曝光、一次显影的方法制作了微电铸用SU-8胶厚胶胶模,解决了高深宽比厚胶胶模制作困难的问题。由于电铸时间长易导致铸层缺陷,故采取分次电铸等措施得到了电铸光栅结构;同时通过线宽补偿的方法解决了溶胀引起的线宽变小问题。在去胶工序中,采用"超声-浸泡-超声"循环往复的方法。最终,制作了周期为130μm、凸台长宽高为900μm×65μm×243μm的金属微光栅,其深宽比达到5,尺寸相对误差小于1%,表面粗糙度小于6.17nm。本文提出的工艺方法克服了现有方法制作金属微光栅时高度有限、基底易碎等局限性,为在金属基底上制作高深宽比金属微光栅提供了一种可行的工艺参考方案。 相似文献
18.
为了解决微内尺度的精密测量问题,提出了一种基于正交傅里叶-梅林矩(OFMM’s)定位的双光纤耦合瞄准触发式微内尺度测量方法。该方法通过耦合器实现光能量在不同光纤间的反向传输,把双光纤传感器测头的横向位移量转化为光束的偏转量,通过显微成像系统把此偏转量转化为CCD图像捕捉系统更大的横向位移量。为提高测量精度,运用OFMM’s的幅值旋转不变性和独特的图像形状细节特征的描述能力对CCD图像捕捉系统的图像信号进行亚像素定位;根据OFMM’s的实际位置进行补偿以提高输出图像边缘的定位精度,从而提高测量精度。对OFMM’s的定位精度及传感器性能进行了实验验证,并依据JJF(黑)8-2008,利用自行研制的微小孔径测量机实现了对直径为200μm、深2 000μm深盲孔的直径测量,其测量重复性不确定度优于0.25μm。 相似文献
19.
A new technique for detecting the focal position of a curved surface provides several advantages both in research and industrial applications. The quality of patterns lasered on a roll surface is determined by the precision of the focus detection, and surfaces of the massive rolls used in laser fabrication can be difficult to adjust properly using conventional technologies. Here, a unique method for detecting the focal position of a curved surface based on the reflected profile of a laser beam is presented. The versatility of the proposed technique results from being able to adjust the laser beam based on changes in the shape and diameter of the beam spot when the specimen surface deviates from the focal plane. A theoretical model based on three-axis movement is proposed, and experimental setups are developed based on the model. Analysis of the obtained results enables high precision positioning of the specimen and identification of the focal point. Furthermore, the presented technique can be used to locate the focal point on any curved surface. Therefore, the theoretical model, analysis results, and focal detection method can be combined in an algorithm for a novel auto-focusing system that can be applied to laser processing of curved surfaces, such as fabricating microgrooves, or engraving roll surfaces in printed electronics. 相似文献
20.
E. Yu. Loktionov Yu. Yu. Protasov V. D. Telekh 《Instruments and Experimental Techniques》2012,55(1):140-144
A diagnostic module for the experimental analysis of the temperature dependence of spectral reflection coefficients for materials
with the use of probing coherent radiation of a laser system with a parametric frequency oscillator (λ ∼ 213–1188 nm) and
laser heating of the studied solid-state sample (up to temperatures T ∼ 2500 K) in vacuum is described. The results of the experimental determination of the spectral reflection coefficients are
entered into the created partition of the experimental and design-theoretical data base of thermophysical, optical, and transporting
properties of structural materials of photon energo-motion and processing high-power-density plants. 相似文献