CN203870311U - Apparatus for compensating temperature with lever - Google Patents
Apparatus for compensating temperature with lever Download PDFInfo
- Publication number
- CN203870311U CN203870311U CN201420225136.8U CN201420225136U CN203870311U CN 203870311 U CN203870311 U CN 203870311U CN 201420225136 U CN201420225136 U CN 201420225136U CN 203870311 U CN203870311 U CN 203870311U
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- China
- Prior art keywords
- optical element
- compensation
- lever
- pedestal
- distance
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- Withdrawn - After Issue
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Abstract
The utility model discloses an apparatus for compensating temperature with a lever. The apparatus may effectively eliminate influence of temperature change on relative position of optical elements. In the apparatus, influenced caused by a linear expansion coefficient is not required to be considered and more reliable compensation is achieved if a pedestal and a compensating lever employ same materials. The apparatus utilizes a following technical scheme that a first optical element, one end of the compensating lever, and a lever fulcrum seat are installed on the pedestal; the lever fulcrum seat is required to be installed on a calculation reference line in the compensation direction; a second optical element is installed on a sliding mechanism over the pedestal; the end, fixed to the pedestal, of the compensating lever is used as the calculation reference line in the compensation direction; and if the relative position of the two optical elements are required to be not changed, just a formula 1 described in the specification is required to be satisfied and thus the distance between the two optical elements does not vary with temperature.
Description
Technical field
The invention belongs to optical instrument and optical device field, for the temperature compensation of optical element spacing.
Background technology
In the process of optical-mechanical system work, in the time that environment temperature changes, due to the temperature expansion characteristic difference of different materials, relative position between optical element can change, and then affect the image quality of optical system, therefore in Optical Instrument Designing process, should take necessary temperature compensation measure, eliminate or reduce the impact that temperature variation is brought.
Conventional method at present, between optical element, directly to adopt expensive low linear expansion coefficient material to connect, although reached so the substantially constant target of relative position between optical element, but the performance requirement to expanding material is higher, in the time that the distance between two optical elements is larger, even if the expansion coefficient of material is very little, still can cause relative position in a small amount to move, compensation difficulty increases, and low-expansion material consumption is large, with high costs simultaneously.
Summary of the invention
For the above-mentioned deficiency of prior art, the present invention proposes a kind of new compensation system, can effectively eliminate the impact of temperature variation on relative position between optical element.
The technical solution used in the present invention is: a kind of device of applying lever and carrying out temperature compensation, it is characterized in that: comprise the first optical element, the second optical element, pedestal, lever, balance pivot seat, compensation bar, one end of described the first optical element, compensation bar, balance pivot seat are arranged on pedestal, described balance pivot seat is arranged on compensation direction and calculates on datum line, and described the second optical element is installed on the slide mechanism of described pedestal top; Described calculating datum line is fixed on one end of pedestal as the calculating datum line of compensation direction taking compensation bar;
The relative position of the first optical element and the second optical element meets:
Wherein, base material linear expansion coefficient is a
1, compensation bar linear expansion coefficient is a
2; The first optical element is L to the distance of datum line
1, the second optical element is L to the distance of datum line
2; Compensation bar is X to the distance of balance pivot
1, the second center of optical element is X to the distance of balance pivot
2.
The present invention compared with prior art has advantages of following:
1, save material cost.In conventional temperature-compensated system, adopt a large amount of expensive low-expansion materials,, and the present invention to most of material without strict demand, only need minute quantity Zero-expansion material, in order to ensure the stable of position of the fulcrum.
2, compensation way is reliable.In the time of temperature variation, the linear expansion coefficient of material can change, and sometimes or even nonlinear, this will increase the error of temperature compensation, in the present invention, if pedestal and compensation bar adopt same material, adopt formula 2,
without the impact of considering that line expansion factor changes, compensate more reliable.
3, computing method are simple.Only lever principle be need utilize, suitable material and appropriate balance pivot and calculating benchmark selected.
Brief description of the drawings
Fig. 1 is lever temperature compensation means structural representation.
1: the first optical element;
2: the second optical elements;
3: lever;
4: balance pivot seat;
5: compensation bar;
6: pedestal.
Fig. 2 is that lever temperature compensation means is applied schematic diagram in Cassegrain system.
7: primary mirror;
8: guide rail;
9: secondary mirror.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The scheme that the present embodiment adopts is as follows:
1, one end of the first optical element 1, compensation bar 5, balance pivot seat 4 are arranged on pedestal, fulcrum block need be arranged on compensation direction and calculate on datum line, and the second 2 of optical elements are installed on the slide mechanism of pedestal top.
2, supposition base material linear expansion coefficient is a
1, compensation bar linear expansion coefficient is a
2, fulcrum block selects linear expansion coefficient to approach zero material, in order to ensure the constant of position of the fulcrum.Be fixed on one end of pedestal with compensation bar
For the calculating datum line of compensation direction, in the time that temperature variation is Δ t, make the first optical element 1 position inclined to one side
Move direction for just, its variable quantity is:
ΔL
1＝L
1a
1Δt
The moving direction of the end points that compensation bar is connected with lever is for negative, and its value is:
ΔL
2＝L
2a
2Δt
According to lever principle, the change in location of the second optical element 2 is for just, and its value is:
As Δ L
1=Δ L
3time, the relative position variable quantity of the first optical element 1 and the second optical element 2 is 0,
Even need to ensure that two optical element relative positions are constant, only need to meet formula 1:
In the time that base material is identical with compensation bar material, only need to meet formula 2:
Two optical element spacing do not vary with temperature and change.
Wherein, base material linear expansion coefficient is a
1, compensation bar linear expansion coefficient is a
2; The first optical element is L to the distance of datum line
1, the second optical element is L to the distance of datum line
2; Compensation bar is X to the distance of balance pivot
1, the second center of optical element is X to the distance of balance pivot
2; The first optical element is Δ L to datum line spacing variable quantity
1, compensation bar length variations amount is Δ L
2, the second optical element is Δ L to datum line spacing variable quantity
3; Temperature variation is Δ t.
3, because lever self is less with the impact of expanding with heat and contract with cold of temperature, in calculating, do not consider.
The device of the present embodiment is implemented at bore 60cm Cassegrain optical telescope.
Primary mirror is 2000mm with time mirror spacing, and secondary mirror mechanism below is along compensation direction mounting guide rail.It is 1.2 × 10 that pedestal adopts linear expansion coefficient
-5carbon steel, it is 2.4 × 10 that compensation bar is selected expansion coefficient
-5aluminium, length 100mm, installation site is apart from secondary mirror center 530mm, it is the invar of S4J32B that balance pivot seat is selected the trade mark, its linear expansion coefficient is 2 × 10
-8, length is 100mm, its temperature variant impact can be ignored.According to calculating formula
can obtain,
therefore fulcrum should be arranged on apart from secondary mirror centre distance is 480mm place,
Can ensure that the primary and secondary mirror spacing being caused by temperature variation is changed to 0.
Although the present invention with preferred embodiment openly as above; but they are not for limiting the present invention, anyly have the knack of this skill person, without departing from the spirit and scope of the invention; can make various changes or retouch from working as, but equally within protection scope of the present invention.
Claims (1)
1. the device applying lever and carry out temperature compensation, comprise the first optical element, the second optical element, pedestal, it is characterized in that: it also comprises lever, balance pivot seat, compensation bar, one end of described the first optical element, compensation bar, balance pivot seat are arranged on pedestal, described balance pivot seat is arranged on compensation direction and calculates on datum line, and described the second optical element is installed on the slide mechanism of described pedestal top; Described calculating datum line is fixed on one end of pedestal as the calculating datum line of compensation direction taking compensation bar;
The relative position of the first optical element and the second optical element meets:
Wherein, base material linear expansion coefficient is a
1, compensation bar linear expansion coefficient is a
2; The first optical element is to base
The distance of directrix is L
1, the second optical element is L to the distance of datum line
2; Compensation bar is X to the distance of balance pivot
1,
The second center of optical element is X to the distance of balance pivot
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420225136.8U CN203870311U (en) | 2014-05-04 | 2014-05-04 | Apparatus for compensating temperature with lever |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420225136.8U CN203870311U (en) | 2014-05-04 | 2014-05-04 | Apparatus for compensating temperature with lever |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203870311U true CN203870311U (en) | 2014-10-08 |
Family
ID=51651248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420225136.8U Withdrawn - After Issue CN203870311U (en) | 2014-05-04 | 2014-05-04 | Apparatus for compensating temperature with lever |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203870311U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108035812A (en) * | 2017-11-03 | 2018-05-15 | 中国航发北京航科发动机控制系统科技有限责任公司 | It is a kind of it is adjustable away from control with changed scale temperature compensation means and method |
-
2014
- 2014-05-04 CN CN201420225136.8U patent/CN203870311U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108035812A (en) * | 2017-11-03 | 2018-05-15 | 中国航发北京航科发动机控制系统科技有限责任公司 | It is a kind of it is adjustable away from control with changed scale temperature compensation means and method |
| CN108035812B (en) * | 2017-11-03 | 2019-11-26 | 中国航发北京航科发动机控制系统科技有限责任公司 | It is a kind of it is adjustable away from control with changed scale temperature compensation means and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141008 Effective date of abandoning: 20160406 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |