Three-dimensional dynamic non-contact attitude detection system based on optical path deflection technology

2021 ◽  
Author(s):  
Zhihang Zhang ◽  
Shuai Zhao ◽  
Chao Ma ◽  
Dengwei Zhang ◽  
Xiaowu Shu ◽  
...  
Keyword(s):  
Detection System ◽  
Three Dimensional ◽  
Optical Path ◽  
Attitude Detection

Fabrication of Three-Dimensional Micro-Structures with Two-Photon Absorption by Femtosecond Laser

2006 ◽  
Vol 532-533 ◽  
pp. 568-571
Author(s):  
Ming Zhou ◽  
Hai Feng Yang ◽  
Li Peng Liu ◽  
Lan Cai
Keyword(s):  
Photonic Crystal ◽  
Femtosecond Laser ◽  
Detection System ◽  
Three Dimensional ◽  
Photon Absorption ◽  
Micro Fabrication ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photo Polymerization ◽  
System A

The photo-polymerization induced by Two-Photon Absorption (TPA) is tightly confined in the focus because the efficiency of TPA is proportional to the square of intensity. Three-dimensional (3D) micro-fabrication can be achieved by controlling the movement of the focus. Based on this theory, a system for 3D-micro-fabrication with femtosecond laser is proposed. The system consists of a laser system, a microscope system, a real-time detection system and a 3D-movement system, etc. The precision of micro-machining reaches a level down to 700nm linewidth. The line width was inversely proportional to the fabrication speed, but proportional to laser power and NA. The experiment results were simulated, beam waist of 0.413μm and TPA cross section of 2×10-54cm4s was obtained. While we tried to optimize parameters, we also did some research about its applications. With TPA photo-polymerization by means of our experimental system, 3D photonic crystal of wood-pile structure twelve layers and photonic crystal fiber are manufactured. These results proved that the micro-fabrication system of TPA can not only obtain the resolution down to sub-micron level, but also realize real 3D micro-fabrication.

T1595: Three Dimensional Image Overlay Navigation Using Magnetic Endoscope Detection System for NOTES® and SILS

2010 ◽  
Vol 71 (5) ◽  
pp. AB318 ◽  
Author(s):  
Maki Sugimoto ◽  
Yoshinori Morita ◽  
Tsuyoshi Sanuki ◽  
Hiromu Kutsumi ◽  
Takeshi Azuma
Keyword(s):  
Detection System ◽  
Three Dimensional ◽  
Dimensional Image ◽  
Image Overlay

scholarly journals Near-Infrared C2H2 Detection System Based on Single Optical Path Time Division Multiplexing Differential Modulation Technique and Multi-Reflection Chamber

2019 ◽  
Vol 9 (13) ◽  
pp. 2637 ◽  
Author(s):  
Biao Wang ◽  
Hongfei Lu ◽  
Chen Chen ◽  
Lei Chen ◽  
Houquan Lian ◽  
...  
Keyword(s):  
Near Infrared ◽  
Detection System ◽  
Optical Path ◽  
Integration Time ◽  
Allan Deviation ◽  
Differential Modulation ◽  
Time Division Multiplexing ◽  
Detection Range ◽  
Modulation Technique ◽  
Time Division

A time division multiplexing differential modulation technique is proposed to address the interference problem caused by the fluctuation of laser light intensity in the single optical path detection system. Simultaneously, a multi-reflection chamber is designed and manufactured to further improve the system’s precision with an optical path length of 80 m. A near-infrared C2H2 detection system was developed. The absorption peak of the acetylene (C2H2) molecule near 1520 nm was selected as the absorption line. A laser driver is developed, and a lock-in amplifier is used to extract the second harmonic (2f) signal. A good linear relationship existed between C2H2 concentration and the 2f signal, and the correlation coefficient was 0.9997. In the detection range of 10–100 ppmv, the minimum detection limit was 0.3 ppmv, and the precision was 2%. At 50 ppmv, C2H2 and continuous detection for 10 h, the data average was 50.03 ppmv, and the fluctuation was less than ±1.2%. The Allan variance method was adopted to evaluate the long-term characteristic of the system. At 1 s of integration time, the Allan deviation was 0.3 ppmv. When the integration time reached 362 s, the Allan deviation was 0.0018 ppmv, which indicates the good stability of the detection system.

The Research of the Multi-Axis Consistency Assembly Adjustment of Optical Collimator

2013 ◽  
Vol 552 ◽  
pp. 298-304
Author(s):  
Zuo Jiang Xiao ◽  
Xuan Chen ◽  
Hai Bin Zhu ◽  
Yan Qing Wang ◽  
Yang Xia ◽  
...  
Keyword(s):  
Measurement Error ◽  
Optical System ◽  
Optical Axis ◽  
Detection System ◽  
Optical Path ◽  
Equivalent Method

This paper reaches a detection system which use for detecting the three-axis consistency of optical collimator basing on equivalent method. Describing the detect principle and calculating the offset of the image of optical path caused by spectroscope via anglicizing of optical system. Meanwhile, it uses zemax to simulate the offset of optical path. After adjusting the structure of the system, the detection system is calibrated by theodolite whose accuracy is 0.5″. The experiment result shows that the measurement error of the optical axis consistency <0.05mrad.

scholarly journals Wavelet Analysis-Based Texture Analysis of Ceramic Surface Images

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yanbing Liu ◽  
Bei Zhou ◽  
Xinghua Yang
Keyword(s):  
Fractal Dimension ◽  
Wavelet Analysis ◽  
Light Source ◽  
Detection System ◽  
Fractal Theory ◽  
Three Dimensional ◽  
Surface Profile ◽  
Ceramic Surface ◽  
Fractal Method ◽  
Main Research

This paper is conducted to explore a new characterization method as a supplement to the traditional roughness characterization. The main research includes the extraction and evaluation of damage features of ceramic surface morphology by applying wavelet methods, the extraction of damage features in surface contours by using wavelet analysis, and the quantitative evaluation of damage degree by using damage rate and damage mean spacing. By comparing various fractal dimension calculation methods, a fractal dimension method suitable for calculating the ceramic surface was selected, and the fractal method was used to describe the ceramic surface topography as a whole. By comparing different methods of calculating the fractal dimension and further verifying them with the measured three-dimensional morphology, it is found that the vibrational method is more suitable for calculating the fractal dimension of ceramic surface, and its calculation accuracy is investigated, and the results show that the method is a reliable one. Based on the fractal theory, a mathematical model of surface wear and surface sealing was established. Further study of the model shows that the surface with a large fractal dimension has a good sealing effect; the surface corresponding to the best fractal dimension is the most resistant to wear. The fractal method can characterize the complexity of the surface profile as a whole. The wavelet method can describe the ceramic surface profile from a local perspective, and the combination of the two methods can characterize the ceramic surface well. Finally, the experimental device of the ceramic surface defect detection system is constructed, and the joint debugging of hardware and software is completed. Under different light source intensities, ceramic image samples are collected, and the accuracy detection experiments of sample defective edges are conducted, and the results show that the light source has a small impact on the accuracy of ceramic defective edge detection. The results show that the light source has more influence on the accuracy of scratch detection. The results show that the system constructed in this thesis has good applicability for different ceramic sample detection.

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