Focal length measurement method for concave lens

A measurement method and technology of concave lens, applied in the direction of testing optical performance, etc., can solve the problems of poor measurement accuracy and cumbersome measurement process, and achieve the effects of simple operation, improved measurement accuracy and simple structure

Active Publication Date: 2019-10-01
FUJIAN NORMAL UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The focal length is one of the most important parameters of a concave lens. The existing methods for measuring the focal length of a concave lens need to measure the object distance and image distance of the concave lens first. The measurement process is cumbersome and the measurement accuracy is poor.

Method used

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  • Focal length measurement method for concave lens
  • Focal length measurement method for concave lens
  • Focal length measurement method for concave lens

Examples

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Embodiment Construction

[0015] like Figure 1~3 As shown, a measurement method for measuring the focal length of a concave lens includes a sodium lamp, a light shield, a first convex lens, a grating, a second convex lens, a third convex lens, a concave lens to be tested and a micrometer eyepiece, and a rectangular light hole is arranged on the light shield , the measurement includes the following steps: (1) Along the incident direction of light, there are coaxial sodium lamps, shading plates, first convex lens, grating, third convex lens and micrometer eyepiece arranged in sequence, turn on the sodium lamp, and the light from the sodium lamp passes through the rectangular The light-through hole is incident on the first convex lens, passes through the first convex lens to form a beam of parallel light, and then the parallel light is vertically incident on the grating, diffracted by the grating, and then the diffracted light converges on the focal plane B of the third convex lens through the third conve...

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Abstract

The invention relates to a focal length measurement method for a concave lens. The method adopts a sodium lamp, a shading plate, a first convex lens, a grating, a second convex lens, a third convex lens, the concave lens on which measurement is to be carried out, and a micrometer eyepiece, wherein a rectangular light transmission hole is formed in the shading plate; and a focal length of the concave lens on which the measurement is to be carried out can be measured through Fraunhofer diffraction. The method provided by the invention has the advantages that the structure is simple, and the operation is easy and convenient; and the focal length of the concave lens on which the measurement is to be carried out can be measured through Fraunhofer diffraction, so that only intervals among diffraction fringes, instead of an image distance and an object distance, need to be measured.

Description

technical field [0001] The invention relates to a measuring method for measuring the focal length of a concave lens. Background technique [0002] Concave lens is a commonly used optical element and is widely used in optical systems. The focal length is one of the most important parameters of a concave lens. The existing methods for measuring the focal length of a concave lens need to measure the object distance and image distance of the concave lens first. The measurement process is cumbersome and the measurement accuracy is poor. Contents of the invention [0003] In view of this, the object of the present invention is to provide a method for measuring the focal length of a concave lens, which has a simple structure and is easy to operate, and can measure the focal length of the concave lens to be measured by Fraunhofer diffraction, and only needs to measure the spacing of the diffraction fringes without measuring Image distance and object distance, improve measurement ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/02
Inventor 翁存程冯尚源章小曼何友武
Owner FUJIAN NORMAL UNIV
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