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.

A NEW METHOD OF LENS CENTERING IN THE OPTICAL SYSTEM BY USING SPECIAL MOUNT

2021 ◽  
pp. 137-144
Author(s):  
Bao Bui Dinh
Keyword(s):  
Optical System ◽  
Optical Axis ◽  
Assembly Process ◽  
Optical Surface ◽  
Lens System ◽  
High Quality ◽  
Manufacturing Equipment ◽  
Influence Coefficients ◽  
Process Solutions

Decentration in lens systems (for example objectives) significantly degrades the quality of image, such as the coma. In order to reduce lens decentration, the lenses are centered while manufacturing, while gluing, while attachment in the mounts. Significant decrease in the lenses decentering in the mounts is achieved by using a special manufacturing equipment, which allow combining the optical axis of the lens with the base axis of the mount in assembly process. Solutions for coma's alignment by shifting, tilting and rotation their components are also provided in the construction of high-quality objectives (microscopes [1-7], photolithographic, aerophotographic). For optimization of methods for such adjustment the influence coefficients of decentering of each optical surface of the lens system on the value and sign of coma must be calculated and taken into account. In this paper, we propose a special mounting which combined with the Opticentric of Trioptics device to center the lenses. The results show that the decentering is significantly reduced (0.9µm) compared to (44.2µm) with using a reference mount.

scholarly journals Current Status of the Astrometric Capabilities of the Hubble Space Telescope Fine Guidance Sensors

1991 ◽  
Vol 127 ◽  
pp. 68-76
Author(s):  
W.H. Jefferys ◽  
G.F. Benedict ◽  
R.L. Duncombe ◽  
O.G. Franz ◽  
L.W. Fredrick ◽  
...  
Keyword(s):  
Optical System ◽  
Reference Frames ◽  
Optical Axis ◽  
Hubble Space Telescope ◽  
Current Knowledge ◽  
Spherical Aberration ◽  
Radial Distance ◽  
Current Status ◽  
Space Telescope ◽  
Wavefront Error

AbstractThe Fine Guidance Sensors (FGSs) are the instrument of choice for most astrometric measurements with the Hubble Space Telescope (HST). The observed amount of spherical aberration in the Ritchey Chretien optical system does not affect positional measurements with perfectly aligned FGSs because they are interferometers. The FGSs combine wavefronts from points in the exit pupil with other points which are at the same radial distance from the optical axis. Asymmetric aberrations such as coma and astigmatism do affect the measured positions. The current knowledge of the HST wavefront error, the FGS operation and the implications for milliarcsecond relative astrometry are discussed. It is still planned to use the HST to tie the HIPPARCOS and VLBI Reference Frames together at the few milliarcsecond level.

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.

scholarly journals Introduction and investigation of magnetic location system for steam-assisted gravity drainage dual-horizontal heavy oil wells

2018 ◽  
Vol 10 (9) ◽  
pp. 168781401879897 ◽  
Author(s):  
Yong Chen ◽  
Hao Yi ◽  
Chuan He
Keyword(s):  
Measurement Error ◽  
Oil Recovery ◽  
Detection System ◽  
Rapid Development ◽  
Gravity Drainage ◽  
Horizontal Projection ◽  
Recovery Method ◽  
Location System ◽  
Steam Assisted Gravity Drainage ◽  
Magnetic Source

Steam-assisted gravity drainage has been proven to be an effective oil recovery method, and the technology of magnetic location is the key to steam-assisted gravity drainage. In view of the rapid development of this technology in China, a new magnetic location system with intellectual property rights was developed in this article, including mechanical parts and circuit section of detection system. Specific structure, operating principle, and technical parameters of magnetic source generator and detection system were designed and analyzed. The ground test results show that the source generator is powered by an alternating current of 4–7 A, the detection system can probe the magnetic field signal 25 m away from the magnetic source generator, and the measurement error is less than 3% by comparison of measured with actual spacing distance. The steam-assisted gravity drainage dual-horizontal well group in Zhong 37 Well block in Fengcheng Oilfield is chosen for further experiment with the developed magnetic location technology. The results of field experiment show the trajectories of Wells I (injection well) and P (production well) are basically matched in the horizontal projection, and the measurement error is within the allowable range. The magnetic location system developed in this article can meet the operational requirement in steam-assisted gravity drainage dual-horizontal wells.

An optical system with aberrations on diffraction integrals written in terms of a generalized ABCD matrix

Open Physics ◽  
2008 ◽  
Vol 6 (4) ◽  
Author(s):  
Chaoying Zhao ◽  
Weihan Tan
Keyword(s):  
Optical System ◽  
General Feature ◽  
Optical Axis ◽  
Glass Plate ◽  
Amplitude Distribution ◽  
Central Peak ◽  
Inclined Plate ◽  
Generalized Matrix ◽  
Parallel Surfaces ◽  
Collimating Lens

AbstractAbstract: In this paper, we consider the transformation of a ray beam as it passes through an optical system containing a glass plate with parallel surfaces inclined to the optical axis at the Brewster’s angle, by investigating the effects of the optical system on amplitude and phase distributions. By applying generalized matrix optics and diffraction integrals and considering the influence of a quarter of a wavelength of aberration on the transmitted amplitude and phase distributions at the focus of a de-collimating lens, we find that the central peak amplitude descends from 1.0 to 0.8 and the phase distortion is less than π/2. The general feature of the amplitude distribution shows an elongation along the y-axis perpendicular to the optical axis in the direction of tilt of the inclined plate, and conforms to the inclination direction of the glass plate.

scholarly journals Fall Prevention Shoes Using Camera-Based Line-Laser Obstacle Detection System

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Tzung-Han Lin ◽  
Chi-Yun Yang ◽  
Wen-Pin Shih
Keyword(s):  
Fall Prevention ◽  
Indoor Environment ◽  
Optical Axis ◽  
Detection System ◽  
The Elderly ◽  
Obstacle Detection ◽  
Critical Parameters ◽  
Will Emit ◽  
Inclined Angle ◽  
Different Levels

Fall prevention is an important issue particularly for the elderly. This paper proposes a camera-based line-laser obstacle detection system to prevent falls in the indoor environment. When obstacles are detected, the system will emit alarm messages to catch the attention of the user. Because the elderly spend a lot of their time at home, the proposed line-laser obstacle detection system is designed mainly for indoor applications. Our obstacle detection system casts a laser line, which passes through a horizontal plane and has a specific height to the ground. A camera, whose optical axis has a specific inclined angle to the plane, will observe the laser pattern to obtain the potential obstacles. Based on this configuration, the distance between the obstacles and the system can be further determined by a perspective transformation called homography. After conducting the experiments, critical parameters of the algorithms can be determined, and the detected obstacles can be classified into different levels of danger, causing the system to send different alarm messages.

Research on Auto-Test System of Telescope Laser Indicator

2014 ◽  
Vol 989-994 ◽  
pp. 2995-2998
Author(s):  
Na Zhou ◽  
Yong Hao Li ◽  
Xin Yan Li
Keyword(s):  
Optical Axis ◽  
Detection System ◽  
Spot Size ◽  
Test System ◽  
System Structure ◽  
Laser Pointer ◽  
Laser Divergence ◽  
Optical Structure ◽  
Light Weapons

Telescope laser pointer is generally used firearms and other light weapons systems, to ensure accurate light weapons capable of targeting, this paper presents a telescope system automatically detects a laser pointer, laser pointer can be the role of the distance, the laser divergence angle of the laser spot size of the laser optical axis adjustment range and the laser optical axis deviation and other parameters were measured. In this paper, the detection system structure, optical structure was designed; proposed laser pointer detection principle of the parameters; and software design. At last, to meet the requirements of this system has been experimentally derived by experimental verification, measurement accuracy.

scholarly journals Deflection and translation of a ray traversing an optical system, nodal rays and the optical axis

2009 ◽  
Vol 68 (4) ◽  
Author(s):  
W. F. Harris ◽  
S. D. Mathebula ◽  
A. Rubin
Keyword(s):  
Optical System ◽  
Optical Axis ◽  
Fundamental Properties ◽  
Straight Line

Expressions are derived for the deflection and transverse translation of a ray as it traverses an arbitrary optical system.  The system may be astigmatic and have relatively decentred refracting elements.  The expressions are in terms of the fundamental properties of the system.  Because nodal rays are rays that undergo no deflection the results lead immediately to expressions that define nodal rays through the system.  An optical axis of an optical system is a nodal ray that is a straight line through the system.  This allows one to write an expression that determines the optical axis of an arbitrary optical system.

Sign in / Sign up

Export Citation Format

Share Document