Research on Optical System Focal Length Measurement Technology based on CCD Imaging Technology

Combination of gyro north-finder, self-collimation photoelectric theodolite can be composed a ground rapid directional aiming system. In the paper, based on the CCD angle measurement technology, the self-collimation optical system is redesigned, focal length of the optical system is calculated, and the appropriate parameters are chosen. Optical conjugate design of the three light paths of light source module, visual module, and CCD receiving module is adopted to synchronize the transmission beams of the three light paths. The simulation and optimum design of light paths in the optical system are achieved by using the ZEMAX software. By analyzing the spot diagram and modulation transfer function (MTF), appropriate structural parameters of the optical system suitable for aiming working conditions are obtained.

Download Full-text

Calibrated precision of ultra-long focal length measurement utilizing Talbot effect and MoirÃÂ© technique

10.1117/12.900308 ◽

2011 ◽

Cited By ~ 1

Author(s):

Qi Zhao ◽

Shaoyun Hu ◽

Hongyin Fan ◽

Feng Lu

Keyword(s):

Focal Length ◽

Length Measurement ◽

Talbot Effect

Download Full-text

Focal length measurement using diffraction at a grating

10.1117/12.51050 ◽

1991 ◽

Cited By ~ 3

Author(s):

Rajpal S. Sirohi ◽

Harish Kumar ◽

Narinder K. Jain

Keyword(s):

Focal Length ◽

Length Measurement

Download Full-text

Long focal length and large aperture zoom optical system

10.1117/12.2603790 ◽

2021 ◽

Author(s):

Wei-jun Chang ◽

Bo Zhang ◽

Ge-ping Cao

Keyword(s):

Optical System ◽

Focal Length ◽

Large Aperture

Download Full-text

An Analysis of the Optical System of a Length Measurement Comparator

Mechanika ◽

10.5755/j01.mech.26.6.24554 ◽

2020 ◽

Vol 26 (6) ◽

pp. 518-525

Author(s):

Rimantas LAZDINAS ◽

Mindaugas JUREVICIUS ◽

Vladas VEKTERIS ◽

Vytautas TURLA ◽

Eugenijus JURKONIS

Keyword(s):

Optical System ◽

Processing Speed ◽

Length Measurement ◽

Identification Algorithm ◽

High Processing Speed ◽

Image Blurring ◽

Scale Calibration ◽

Calibration Accuracy ◽

The Impact ◽

High Processing

In the paper, the optical system of a precise bar length measuring comparator is analysed. The requirements for such a system are determined and systematized. The impact of the resolution, signal discretization frequency, image blurring, bar edge measurement indeterminacy and camera noise on measuring the bar width and establishing the bar position is discussed upon. Various algorithms have been analysed and finally a bar edge identification algorithm oriented to the scale calibration accuracy and the high processing speed was proposed. In the end of the paper, conclusions are provided.

Download Full-text

Paraxial focal length measurement method with a simple apparatus

Optics Express ◽

10.1364/oe.27.002044 ◽

2019 ◽

Vol 27 (3) ◽

pp. 2044 ◽

Cited By ~ 4

Author(s):

Zhangji Lu ◽

Lilong Cai

Keyword(s):

Measurement Method ◽

Focal Length ◽

Length Measurement ◽

Simple Apparatus

Download Full-text

Optical Design of a Shortwave Infrared Dual Camera CASSI Based on Improved Offner-Wynne Imaging Spectrometer

Journal of Physics Conference Series ◽

10.1088/1742-6596/2112/1/012021 ◽

2021 ◽

Vol 2112 (1) ◽

pp. 012021

Author(s):

Chong Song ◽

Lipeng Huo ◽

Yong Huang ◽

Yangdong Yan ◽

Gang Wang ◽

...

Keyword(s):

Optical System ◽

Imaging System ◽

Optical Measurement ◽

Focal Length ◽

Optical Design ◽

Optical Transmittance ◽

Coded Aperture ◽

Visual Axis ◽

Imaging Spectrometer ◽

Shortwave Infrared

Abstract Based on the optical system characteristics of coded aperture snapshot spectral imager (CASSI), an optimized optical system of shortwave infrared dual camera CASSI was designed based on improved Offner-Wynne imaging spectrometer. The operating wavelength of the optical system ranges from 900nm to 1700nm, and the focal length is 1200mm. It consists of two parts: the two dimensional imaging system and the multispectral CASSI imaging system. The key technical parameters of the two parts are the same and there is no visual axis difference. Therefore, the optimized optical system can effectively improve real-time performance, optical transmittance and compactness of the dual camera shortwave infrared CASSI, which is conducive to the application in optical measurement scenes in the shooting range.

Download Full-text

A proposed Mathematical Expression for Computer Design of Electrostatic Mirror

Baghdad Science Journal ◽

10.21123/bsj.9.1.148-152 ◽

2012 ◽

Vol 9 (1) ◽

pp. 148-152

Author(s):

Baghdad Science Journal

Keyword(s):

Optical System ◽

Focal Length ◽

Mathematical Expression ◽

Optical Element ◽

Chromatic Aberration ◽

Computer Design ◽

Computational Investigation ◽

Beam Path ◽

Runge Kutta Method ◽

Electrostatic Mirror

A computational investigation has been carried out on the design and properties of the electrostatic mirror. In this research, we suggest a mathematical expression to represent the axial potential of an electrostatic mirror. The electron beam path under zero magnification condition had been investigated as mirror trajectory with the aid of fourth – order – Runge – Kutta method. The spherical and chromatic aberration coefficients of mirror has computed and normalized in terms of the focal length. The choice of the mirror depends on the operational requirements, i.e. each optical element in optical system has suffer from the chromatic aberration, for this case, it is use to operate the mirror in optical system at various values of chromatic aberration to correct it in that system.

Download Full-text