CN208765931U - A kind of device measuring focal length of convex lens - Google Patents
A kind of device measuring focal length of convex lens Download PDFInfo
- Publication number
- CN208765931U CN208765931U CN201821654706.XU CN201821654706U CN208765931U CN 208765931 U CN208765931 U CN 208765931U CN 201821654706 U CN201821654706 U CN 201821654706U CN 208765931 U CN208765931 U CN 208765931U
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- China
- Prior art keywords
- convex lens
- aperture
- focal length
- optical axis
- guide rail
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- Testing Of Optical Devices Or Fibers (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model discloses a kind of devices for measuring focal length of convex lens, belong to optical technical field, more particularly to a kind of geometric optics physical parameter measuring device, convex lens to be measured will be incident to after the light beam-expanding collimation of laser sending, it is minimum in the spot size of focal point, one aperture is placed in the optical path, spot size in focus two sides is bigger with focal point distance more distance light spot, optical power density is lower, aperture is placed on along the guide rail of the translatable adjusting of optical axis direction in this way, when aperture is in lens focus, through the maximum optical power of aperture, it may thereby determine that the image space focal length of convex lens is equal to convex lens center to be measured at a distance from aperture, the technical program structure is simple, the precision of measurement greatly improves, to realize the precise measurement of the focal length of lens.
Description
Technical field
The utility model belongs to optical technical field, and in particular to a kind of geometric optics physical parameter measuring device.
Background technique
The measuring principle of focal length of convex lens measuring device in the prior art utilizes lens image formation rule measurement lens
Focal length needs first to measure object distance and image distance, when measuring image distance, first has to find out clearest picture, however naked-eye observation is not
It can accurately determine imaging position, have biggish deviation so as to cause focal length measurement.
Utility model content
The purpose of this utility model is to solve the coke of convex lens caused by object distance image distance measurement error in focal length of convex lens device
Decline problem away from measurement accuracy.
In order to achieve the above objectives, the technical solution adopted in the utility model is: a kind of device measuring focal length of convex lens, packet
It includes laser, be successively set on optical axis along optical propagation direction: the first convex lens, the second convex lens, bracket, aperture light
Door screen, third convex lens, light power meter；Wherein: first convex lens and the second convex lens group is used at beam-expanding collimation system
Laser is issued into beam expander collimation；The bracket is for placing convex lens to be measured；The aperture is arranged on edge
On the guide rail of the translatable adjusting of optical axis direction and aperture center is on optical axis；The third convex lens assembles laser beam
To light power meter.
The working principle of above-mentioned apparatus are as follows: directional light is minimum in the spot size of focal point after convex lens to be measured, will
One aperture place in the optical path, focus two sides spot size with focal point distance more distance light spot bigger, optical power
Density is lower, and aperture is placed on along the guide rail of the translatable adjusting of optical axis direction in this way, when aperture is in lens
When focus, through the maximum optical power of aperture, it may thereby determine that the image space focal length of convex lens is equal in convex lens to be measured
The heart is at a distance from aperture.
Preferred scheme is as follows in above scheme: being equipped with scale on the guide rail.It reads with can be convenient so small
The position of hole diaphragm.
The bracket and aperture is arranged on the same guide rail for being equipped with scale.It is convenient directly read bracket with
The position of aperture, and then calculate the image space focal length of convex lens to be measured.
The scale is grating scale.Grating scale can be further improved positioning accuracy.
The aperture is placed near the rear focus of convex lens to be measured.Aperture is directly placed on focus
Nearby to cooperate light power meter to be accurately positioned position of the focus on scale.
The optical path that focal length of convex lens is measured in conventional physical experiment utilizes lens image formation rule, and observing by the naked eye can not
Accurate to determine imaging position, there are focuses when larger aberration at its different bore not to weigh for convex lens itself especially to be measured
It closes, therefore there are biggish errors for the measurement of imaging position.The device of the technical program uses light power meter instead accurately to determine
The position of mirror foci overcomes the defect of conventional apparatus measurement, and the precision of measurement greatly improves, to realize the essence of the focal length of lens
Really measurement.
Detailed description of the invention
Attached drawing 1 is the schematic device for measuring focal length of convex lens；
Attached drawing 2 is normalized transmittance with aperture change in location figure；
Wherein: 1, laser；2, the first convex lens；3, the second convex lens；4, convex lens mirror support to be measured；5, aperture；
6, third convex lens；7, light power meter.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and embodiments:
Embodiment one:
A kind of device measuring focal length of convex lens, as shown in Figure 1, being set gradually including laser 1, along optical propagation direction
On optical axis: the first convex lens 2, the second convex lens 3, convex lens mirror support 4 to be measured, aperture 5, third convex lens 6, light function
Rate meter 7, along the guide rail of the translatable adjusting of optical axis direction；Wherein: first convex lens and the second convex lens group is at expanding standard
Direct line system, for laser to be issued beam expander collimation；The bracket is for placing convex lens to be measured；The aperture light
Door screen is arranged in along the guide rail of the translatable adjusting of optical axis direction and aperture center is on optical axis；The third convex lens will
Laser beam converges to light power meter.
Embodiment two:
A kind of device measuring focal length of convex lens, is successively set on optical axis including laser, along optical propagation direction:
First convex lens, the second convex lens, bracket, aperture, third convex lens, light power meter, along the translatable adjusting of optical axis direction
Guide rail, grating scale, driving motor, data register；Wherein: first convex lens and the second convex lens group is at expanding standard
Direct line system, for laser to be issued beam expander collimation；The bracket is for placing convex lens to be measured；Grating scale setting exists
On the guide rail, the aperture is arranged on guide rail, and the driving motor driving aperture is translated along optical axis；
Laser beam is converged to light power meter by the third convex lens, and the grating scale and light power meter are in real time by data transfer
To data register.
Attached drawing 2 is aperture diameter when being 0.3mm, through aperture optical power with change in location curve.From
As can be seen that scanning curve is about focal position bilateral symmetry in figure, focal point position is closer, and the power of transmission is bigger, and
Near focal point amplitude of variation is obvious, maximum value occurs in focal position, according to the position of peak value, so that it may determine the position of focus
It sets, to accurately obtain the focal length of lens.This scheme can realize that measurement process automates.
The technical program unspecified part belongs to technology well known to those skilled in the art.
Claims (6)
1. a kind of device for measuring focal length of convex lens, is successively set on optical axis including laser, along optical propagation direction: the
One convex lens, the second convex lens, bracket, aperture, third convex lens, light power meter；Wherein: first convex lens with
Second convex lens group is at beam-expanding collimation system, for laser to be issued beam expander collimation；The bracket for place to
Survey convex lens；The aperture is arranged in along the guide rail of the translatable adjusting of optical axis direction and aperture center is in optical axis
On；Laser beam is converged to light power meter by the third convex lens.
2. a kind of device for measuring focal length of convex lens according to claim 1, it is characterised in that: installed on the guide rail
There is scale.
3. a kind of device for measuring focal length of convex lens according to claim 2, it is characterised in that: the bracket and aperture
Diaphragm is arranged on the guide rail.
4. a kind of device for measuring focal length of convex lens according to claim 2 or 3, it is characterised in that: the scale is
Grating scale.
5. the device of any a kind of measurement focal length of convex lens according to claim 1 ~ 3, it is characterised in that: the aperture
Diaphragm is placed near the rear focus of convex lens to be measured.
6. it is according to claim 4 it is a kind of measure focal length of convex lens device, it is characterised in that: further include driving motor,
Data register；The driving motor driving aperture is translated along optical axis, and the grating scale and light power meter in real time will
Data transfer is to data register.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821654706.XU CN208765931U (en) | 2018-10-12 | 2018-10-12 | A kind of device measuring focal length of convex lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821654706.XU CN208765931U (en) | 2018-10-12 | 2018-10-12 | A kind of device measuring focal length of convex lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208765931U true CN208765931U (en) | 2019-04-19 |
Family
ID=66136509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821654706.XU Expired - Fee Related CN208765931U (en) | 2018-10-12 | 2018-10-12 | A kind of device measuring focal length of convex lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208765931U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207911A (en) * | 2020-01-19 | 2020-05-29 | 中国科学院上海光学精密机械研究所 | Method for measuring refractive index of parallel plane transparent solid material |
-
2018
- 2018-10-12 CN CN201821654706.XU patent/CN208765931U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207911A (en) * | 2020-01-19 | 2020-05-29 | 中国科学院上海光学精密机械研究所 | Method for measuring refractive index of parallel plane transparent solid material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190419 Termination date: 20191012 |
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| CF01 | Termination of patent right due to non-payment of annual fee |