Relationship between subsurface damage and surface roughness of ground optical materials

2007 ◽  
Vol 14 (4) ◽  
pp. 546-551 ◽  
Author(s):  
Sheng-yi Li ◽  
Zhuo Wang ◽  
Yu-lie Wu
Keyword(s):  
Surface Roughness ◽  
Optical Materials ◽  
Subsurface Damage

scholarly journals Influence of surface roughness on the light transmission through the boundaries of luminescent materials in radiation detectors-=SUP=-*-=/SUP=-

2021 ◽  
Vol 129 (9) ◽  
pp. 1182
Author(s):  
P. Liaparinos
Keyword(s):  
Surface Roughness ◽  
Optical Sensors ◽  
Optical Materials ◽  
Light Transmission ◽  
Imaging System ◽  
Radiation Detectors ◽  
Optical Signal ◽  
Transmission Factor ◽  
Luminescent Materials ◽  
Intermediate Surface

The optical transfer properties of an imaging system are affected by the performance of the discrete cascaded system stages that transfer efficiently the optical signal. Apart from the contribution of each component to the overall optical propagation, crucial role also plays the intermediate surface conditions. Surface roughness is characterized by irregularities with respect with the ideal smooth form. The degree of roughness has an influence on the surface behavior affecting correspondingly the overall enhancement of system's optical performance. In this manuscript, the angle dependent effect of surface roughness on phosphor . optical materials configuration is provided taking into account eight luminescent materials (CsI, Y3Al5O12, Y2O3, Bi4Ge3O12, CaWO4, ZnS, Lu2O3 and Gd2O2S) and three optical materials (InGaAs, ITO and SiO2). Results showed that higher transmission optical properties exhibited the: (i) CsI-InGaAs combination, (ii) ZnS-ITO and (iii) ZnS-SiO2 combination. The transmission factor was also quantitatively affected by increasing the surface roughness values and by decreasing the incident polar angles. Keywords: luminescent materials, optical sensors, surface roughness

scholarly journals Laser-assisted grinding of reaction-bonded SiC

2020 ◽  
Vol 3 (2) ◽  
pp. 93-98
Author(s):  
Xichun Luo ◽  
Zhipeng Li ◽  
Wenlong Chang ◽  
Yukui Cai ◽  
Jining Sun ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Process Development ◽  
Thermal Control ◽  
Subsurface Damage ◽  
Experimental Comparison ◽  
Depth Of Cut ◽  
Machined Surface ◽  
Control Approach ◽  
Damage Layer ◽  
Conventional Grinding

The article presents the development of a novel laser-assisted grinding (LAG) process to reduce surface roughness and subsurface damage in grinding reaction-bonded silicon carbide (RB-SiC). A thermal control approach is proposed to facilitate the process development, in which a two-temperature model (TTM) is applied to control the required laser power to thermal softening of RB-SiC prior to the grinding operation without melting the workpiece or leaving undesirable microstructural alteration. Fourier’s law is adopted to obtain the thermal gradient for verification. An experimental comparison of conventional grinding and LAG shows significant reduction of machined surface roughness (37%–40%) and depth of subsurface damage layer (22%–50.6%) using the thermal control approach under the same grinding conditions. It also shows high specific grinding energy 1.5 times that in conventional grinding at the same depth of cut, which accounts for the reduction of subsurface damage as it provides enough energy to promote ductile-regime material removal.

Experimental Investigation on Surface/Subsurface Damage in Rotary Ultrasonic Machining of Glass BK7

2013 ◽  
Vol 325-326 ◽  
pp. 1357-1361 ◽  
Author(s):  
Yan Hua Huang ◽  
Dong Xi Lv ◽  
Yong Jian Tang ◽  
Hong Xiang Wang ◽  
Hai Jun Zhang
Keyword(s):  
Surface Roughness ◽  
Ultrasonic Vibration ◽  
Process Parameters ◽  
Subsurface Damage ◽  
Spindle Speed ◽  
Feed Speed ◽  
Ultrasonic Machining ◽  
Rotary Ultrasonic Machining ◽  
Cutting Depth ◽  
Influence Of Process Parameters

Experiments were carried out to study the effect of ultrasonic vibration on the surface roughness and subsurface damage (SSD) in rotary ultrasonic machining (RUM) of glass BK7. As a comparison, some conventional grinding (CG) experiments were also performed under the same process parameters with there of the RUM ones. The surface roughness of the RUM/CG samples was measured with a surface profilometer. The SSD of these specimens was assessed and characterized by a measuring microscope with the help of the taper polishing method. Also, the influence of process parameters (cutting depth, feed speed, and spindle speed) on the surface/subsurface quality was discussed. As a result, both the surface roughness and the SSD depth of the RUM/CG specimens were reduced with the increased spindle speed, while increased with the increasing of feed speed and cutting depth of the diamond tool. Compared with the CG process, the introduction of ultrasonic vibration resulted in the higher surface roughness and SSD depth, due to the fact that the max cutting depth of the abrasive in the RUM process increased by an amplitude compared with that in the CG process.

scholarly journals Effect of grinding parameters on surface roughness and subsurface damage and their evaluation in fused silica

2018 ◽  
Vol 26 (4) ◽  
pp. 4638 ◽  
Author(s):  
Huapan Xiao ◽  
Zhi Chen ◽  
Hairong Wang ◽  
Jiuhong Wang ◽  
Nan Zhu
Keyword(s):  
Surface Roughness ◽  
Fused Silica ◽  
Subsurface Damage ◽  
Grinding Parameters

Subsurface damage in some single crystalline optical materials

2005 ◽  
Vol 44 (12) ◽  
pp. 2241 ◽  
Author(s):  
Joseph A. Randi ◽  
John C. Lambropoulos ◽  
Stephen D. Jacobs
Keyword(s):  
Optical Materials ◽  
Subsurface Damage ◽  
Single Crystalline

scholarly journals Relations between subsurface damage depth and surface roughness of grinded fused silica

2013 ◽  
Vol 21 (25) ◽  
pp. 30433 ◽  
Author(s):  
P. Blaineau ◽  
R. Laheurte ◽  
P. Darnis ◽  
N. Darbois ◽  
O. Cahuc ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Fused Silica ◽  
Subsurface Damage ◽  
Damage Depth

scholarly journals Factor Analysis of Machining Parameters On Surface Integrity of CFRP Composites Based On A Microscopic Finite Element Cutting Model

2021 ◽  
Author(s):  
Jianzhang Xiao ◽  
Guifeng Wang ◽  
Hang Su ◽  
Pengcheng Huang ◽  
Zhongzhe Chen
Keyword(s):  
Surface Roughness ◽  
Factor Analysis ◽  
Surface Integrity ◽  
Fiber Orientation ◽  
Subsurface Damage ◽  
Machining Parameters ◽  
Factors Affecting ◽  
Cfrp Composites ◽  
Damage Depth ◽  
Cutting Model

Abstract In the paper, a three-dimensional (3D) micromechanical finite element (FE) cutting model with three phases was developed to study the surface integrity of CFRP composites. The surface roughness and the depth of subsurface damage were predicted by using the FE cutting model, which were used to characterize the surface integrity. The machined surface observations and surface roughness measurements of CFRP composites at different fiber orientations were also performed for model validation. It is indicated that the 3D micromechanical model is capable of precisely predicting the surface integrity of CFRP composites. To investigate the complex coupling influences of multiple machining parameters on the surface integrity, the factor analysis of multiple machining parameters was performed, and then the effects of these machining parameters on the surface roughness and subsurface damage depth were obtained quantitatively. It was found that the fiber orientation angle and cutting speed are the most significant factors affecting the surface roughness, and the fiber orientation and edge radius are the main factors affecting the subsurface damage depth. The results also reveal that coupling effects of depth of cut and edge radius should be considered for improving the surface integrity of CFRP composites.

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