CN2869835Y - Instrument for measuring convex lens focal distance using laser speckle - Google Patents
Instrument for measuring convex lens focal distance using laser speckle Download PDFInfo
- Publication number
- CN2869835Y CN2869835Y CN 200620028212 CN200620028212U CN2869835Y CN 2869835 Y CN2869835 Y CN 2869835Y CN 200620028212 CN200620028212 CN 200620028212 CN 200620028212 U CN200620028212 U CN 200620028212U CN 2869835 Y CN2869835 Y CN 2869835Y
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- CN
- China
- Prior art keywords
- convex lens
- viewing screen
- movable stand
- laser generator
- instrument
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
An apparatus measuring the focal length of the convex len utilizing laser speckles which belongs to a measuring apparatus technosphere, comprising a permanent seat, a laser generator, a beam expander, a convex lens, a movable stand and a viewing screen. The laser generator, the beam expander , the convex lens and the viewing screen are fixed to the permanent seat in sequence. The movable stand is installed on the permanent seat located between the convex lens and the viewing screen. In the case of measuring the convex lens, the convex lens to be measured is positioned on the movable stand. The laser given by a laser generator is converted into a parallel beam by a convex lens beginning with the beam expending by a beam expander. The parallel beam, collected by the convex lens to be measured, shines out on the viewing screen. In the case of moving the movable stand, when the light spot on the viewing screen is observed to be maximal, the distance between the movable stand and the viewing screen is the focal length of the convex lens measured. The utility model is easy to be handled, direct in viewing, simple in structure, and has an accurate measurement result.
Description
Technical field:
The utility model belongs to the surveying instrument technical field, is a kind of instrument that can measure focal length of convex lens.
Background technology:
A few days ago, the focal length of measuring convex lens generally adopts method of geometry, and running program is loaded down with trivial details, and will just can obtain the result through calculating.
Summary of the invention:
The purpose of this utility model is that a kind of instrument that can make things convenient for, measure focal length of convex lens intuitively will be provided.
Principle of the present utility model is to utilize laser radiation to form speckle at body surface focal length of convex lens is measured.The main theory that laser speckle forms is the Huygens' principle in the physics, after body surface is by laser radiation, respectively naming a person for a particular job and send the reflection subwave in the surface, produces in space surface and interfere, and some local light intensity is strengthened, some local light intensity decreasing, thereby the light intensity of formation size shape is the three-dimensional spot of stochastic distribution all, and the illuminated area of laser is big, and speckle is little, illuminated area is little, and speckle is big.The utility model forms based on above-mentioned principle design.
The scheme of the utility model technical solution problem is to adopt holder, laser generator, beam expanding lens, convex lens, movable stand and film viewing screen to constitute the instrument of measuring focal length of convex lens, laser generator, beam expanding lens, convex lens and film viewing screen are fixed on the holder successively, and movable stand is installed on the holder between convex lens and the film viewing screen.When measuring tested convex lens, tested convex lens are placed on the movable stand, laser generator sends laser, expands bundle by beam expanding lens, forms parallel beam through convex lens again, be radiated on the tested convex lens, bring together through tested convex lens, the rayed after bringing together moves forward and backward movable stand on film viewing screen, when observing the hot spot maximum on the film viewing screen, the distance between movable stand and the film viewing screen is exactly tested focal length of convex lens.
Volume for the instrument that reduces focal length of convex lens is equipped with completely reflecting mirror on the holder between laser generator and the beam expanding lens, the reflective surface of completely reflecting mirror is towards the side top of beam expanding lens direction, and laser generator is contained in completely reflecting mirror and top.Laser generator sends laser and reflexes on the beam expanding lens by completely reflecting mirror.
For the ease of observing tested focal length of convex lens, on the holder between convex lens and the film viewing screen, rule is housed.
The utility model is easy and simple to handle, directly perceived, and is simple in structure, and measurement result is accurate.
Description of drawings:
Fig. 1 is the utility model structural representation;
Fig. 2 is the utility model index path.
Embodiment:
The utility model is made of holder 1, laser generator 2, beam expanding lens 3, convex lens 4, movable stand 5 and film viewing screen 6, beam expanding lens 3, convex lens 4 and film viewing screen 6 are fixed on the holder 1 successively, movable stand 5 is installed on the holder 1 between convex lens 4 and the film viewing screen 6, on the holder 1 between laser generator 2 and the beam expanding lens 3, completely reflecting mirror 7 is housed, the reflective surface of completely reflecting mirror 7 is towards the side top of beam expanding lens 3 directions, laser generator 2 is contained in completely reflecting mirror 7 and top, on the holder 1 between convex lens 4 and the film viewing screen 6 rule 8 is housed.
Claims (3)
1, a kind of instrument that utilizes the laser speckle measurement focal length of convex lens, it is characterized in that: it is made of holder, laser generator, beam expanding lens, convex lens, movable stand and film viewing screen, laser generator, beam expanding lens, convex lens and film viewing screen are fixed on the holder successively, and movable stand is installed on the holder between convex lens and the film viewing screen.
2, the instrument of measurement focal length of convex lens according to claim 1, it is characterized in that: on the holder between laser generator and the beam expanding lens completely reflecting mirror is housed, the reflective surface of completely reflecting mirror is towards the side top of beam expanding lens direction, and laser generator is contained in completely reflecting mirror and top.
3, the instrument of measurement focal length of convex lens according to claim 1 is characterized in that: on the holder between convex lens and the film viewing screen rule is housed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620028212 CN2869835Y (en) | 2006-01-27 | 2006-01-27 | Instrument for measuring convex lens focal distance using laser speckle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620028212 CN2869835Y (en) | 2006-01-27 | 2006-01-27 | Instrument for measuring convex lens focal distance using laser speckle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2869835Y true CN2869835Y (en) | 2007-02-14 |
Family
ID=37724775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620028212 Expired - Fee Related CN2869835Y (en) | 2006-01-27 | 2006-01-27 | Instrument for measuring convex lens focal distance using laser speckle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2869835Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998096A (en) * | 2012-12-17 | 2013-03-27 | 吉林大学 | Method for measuring focal distance of convex lens |
| CN114061910A (en) * | 2021-11-12 | 2022-02-18 | 西安交通大学 | Device and method for measuring focal length of convex-concave lens |
-
2006
- 2006-01-27 CN CN 200620028212 patent/CN2869835Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998096A (en) * | 2012-12-17 | 2013-03-27 | 吉林大学 | Method for measuring focal distance of convex lens |
| CN102998096B (en) * | 2012-12-17 | 2016-03-30 | 吉林大学 | The measuring method of focal length of convex lens |
| CN114061910A (en) * | 2021-11-12 | 2022-02-18 | 西安交通大学 | Device and method for measuring focal length of convex-concave lens |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070214 |