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Measuring Method of Sampling Volume of Oblique Imaging System

A technology of tilting object plane and sampling volume, which is applied in the field of optical measurement

Inactive Publication Date: 2017-08-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, no measurement method for the sampling volume of the oblique imaging system has been proposed.

Method used

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  • Measuring Method of Sampling Volume of Oblique Imaging System
  • Measuring Method of Sampling Volume of Oblique Imaging System
  • Measuring Method of Sampling Volume of Oblique Imaging System

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: Only object plane tilt imaging system

[0030] figure 1 is the algorithm flow chart of the invention, figure 2 (a) is a structural diagram of only the oblique imaging system of the object plane in the invention. Described optical imaging experiment system is made up of ceramic grid calibration plate 1 (object plane), imaging lens 2 and CCD sensor 3, wherein: CCD sensor size is 2 / 3 ", and number of pixels is 1384pix*1036pix, and pixel size is 6.45μm*6.45μm; lens focal length 50mm, F # = 1.4; the size of the grid calibration plate is 50mm*50mm, the grid size is 2mm*2mm, and the line width is 0.05mm; the central magnification β during measurement o =0.258, object distance u o =243.8mm, image distance v o = 62.9 mm.

[0031] Place the grid calibration plate on the figure 2 At the position of the object plane in (a), at the inclination angle of the object plane θ=30°, image it with the lens. The geometric center of the reticle plane of the grid calibr...

Embodiment 2

[0039] Embodiment 2: Dual-tilt imaging system of object image plane

[0040] figure 2 (b) is a structural diagram of the dual-tilt imaging system of the object image plane in the invention. The composition of the optical imaging experimental system is the same as that of Embodiment 1, and the parameters of the ceramic grid calibration plate, imaging lens and CCD sensor are also the same. Center magnification β during measurement o =0.258, object distance u o =243.8mm, image distance v o = 62.9 mm.

[0041] Place the grid calibration plate on the figure 2 At the position of the object plane in (b), at the inclination angle of the object plane θ=45°, use the lens to image it. The geometric center of the reticle plane of the grid calibration plate passes through the optical axis determined by the imaging lens; the geometric center of the image-sensitive surface of the CCD sensor also passes through the optical axis, and is in the axial axis conjugate to the geometric cent...

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Abstract

A method for measuring the sampling volume of an object plane tilted imaging system, the method comprising: fixing the angle θ between the object plane and the optical axis of an imaging lens, building an object plane tilted imaging experimental system, and obtaining each object at the object plane tilt angle θ Grid calibration plate image at face position x. Each grid calibration plate image received by the CCD sensor is processed to obtain the clear imaging object area of ​​each image. Integrate the clear imaging object area at each object plane position x obtained above with the object plane parallel movement interval Δx to obtain the sampling volume at the object plane inclination angle θ. Change the value of the inclination angle of the object plane, repeat the above process, and obtain the sampling volume at each inclination angle of the object plane. In this way, the empirical calculation formula of the sampling volume and the inclination angle of the object plane is obtained by fitting, and the sampling volume at any inclination angle of the object plane is further obtained. The invention provides a strong basis for designing and optimizing an object plane tilt imaging system.

Description

technical field [0001] The invention relates to a method for measuring the sampling volume of an optical imaging system, in particular to a method for measuring the sampling volume of an object plane tilt imaging system, which is suitable for two imaging systems with only object plane tilt or double tilt of the object image plane, and belongs to optical measurement technology field. Background technique [0002] With the expansion of the application field of optical imaging systems, the imaging system in which the object plane, the main lens surface and the image plane are parallel to each other has been unable to meet people's needs in the actual industry and some special industries. Therefore, the imaging system in which the object plane is inclined to the optical axis is studied. Is of great significance. The object plane tilt imaging system includes only the object plane tilt imaging system and the object image plane double tilt imaging system. There are currently many...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02
Inventor 张红霞刘京贾大功刘铁根张以谟
Owner TIANJIN UNIV