CN103941370A - Method and apparatus for carrying out temperature compensation by use of lever principle - Google Patents

Method and apparatus for carrying out temperature compensation by use of lever principle Download PDF

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Publication number
CN103941370A
CN103941370A CN201410183929.2A CN201410183929A CN103941370A CN 103941370 A CN103941370 A CN 103941370A CN 201410183929 A CN201410183929 A CN 201410183929A CN 103941370 A CN103941370 A CN 103941370A
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China
Prior art keywords
optical element
compensation
datum line
expansion coefficient
compensation bar
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CN201410183929.2A
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CN103941370B (en
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郑锋华
张露
张海军
吴海燕
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Nanjing Astronomical Instruments Co Ltd
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Nanjing Astronomical Instruments Co Ltd
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Abstract

The invention discloses a method and an apparatus for carrying out temperature compensation by use of the lever principle. The method and the apparatus are capable of effectively eliminating the influence, caused by temperature change, on relative positions between optical elements. The method and the apparatus are characterized in that the influence of linear expansion coefficient change does not need to be considered if a base and a compensation rod are made of the same material, and therefore, compensation is more reliable. The technical scheme is as follows: a first optical element, one end of a compensation rod and a lever support seat are mounted on a base, the support seat needs to be mounted on the calculation datum line of a compensation direction, and a second optical element is mounted on a sliding mechanism above the base; one end, fixed on the base, of the compensation rod is taken as the calculation datum line of the compensation direction, and if relative positions of the two optical elements need to be ensured to be unchanged, only a formula 1 as shown in the specification needs to be satisfied; the space between the two optical elements does not change along with the change of temperatures.

Description

A kind of method and apparatus of applying lever principle and carrying out temperature compensation
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 method, 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 method of applying lever principle and carrying out temperature compensation, is characterized in that:
One end of the first optical element, compensation bar, balance pivot seat are arranged on pedestal, and balance pivot seat is arranged on compensation direction and calculates on datum line, and the second optical element is installed on the slide mechanism of pedestal top;
Base material linear expansion coefficient is a 1, compensation bar linear expansion coefficient is a 2; Be fixed on one end of pedestal taking compensation bar as the calculating datum line of compensation direction, in the time that temperature variation is Δ t, make the first position of optical element offset 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 is for just, and its value is:
ΔL 3 = X 2 ΔL 2 X 1 = X 2 L 2 a 2 Δt X 1
As Δ L 1=Δ L 3time, the relative position variable quantity of the first optical element and the second optical element is 0, ensures that two optical element relative positions are constant, only needs to meet formula 1:
X 2 X 1 = L 1 a 1 L 2 a 2 Formula 1.
Select linear expansion coefficient when fulcrum block and approach zero material, in order to ensure the constant of position of the fulcrum;
In the time that base material is identical with compensation bar material, only need to meet formula 2:
X 2 X 1 = L 1 L 2 Formula 2
Two optical element spacing do not vary with temperature and change.
As a same reason, the present invention has proposed a kind of device of applying lever and carrying out temperature compensation simultaneously, comprise the first optical element, the second optical element, pedestal, it is characterized in that: it also comprises regulations and parameters, regulations and parameters fulcrum block, 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:
X 2 X 1 = L 1 a 1 L 2 a 2 ,
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.
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 principle temperature compensation schematic diagram.
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 principle temperature compensation 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 taking compensation bar as the calculating datum line of compensation direction, in the time that temperature variation is Δ t, make the first optical element 1 offset direction, position 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:
ΔL 3 = X 2 ΔL 2 X 1 = X 2 L 2 a 2 Δt X 1
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 needs to ensure that two optical element relative positions are constant, only needs to meet formula 1:
X 2 X 1 = L 1 a 1 L 2 a 2 Formula 1
In the time that base material is identical with compensation bar material, only need to meet formula 2:
X 2 X 1 = L 1 L 2 Formula 2
Two optical element spacing do not vary with temperature and change.
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 is with preferred embodiment openly as above, 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, and certainly when making various changes or retouch, but equally within protection scope of the present invention.

Claims (3)

1. apply lever principle and carry out a method for temperature compensation, it is characterized in that:
One end of the first optical element, compensation bar, balance pivot seat are arranged on pedestal, and balance pivot seat is arranged on compensation direction and calculates on datum line, and the second optical element is installed on the slide mechanism of pedestal top;
Base material linear expansion coefficient is a 1, compensation bar linear expansion coefficient is a 2; Be fixed on one end of pedestal taking compensation bar as the calculating datum line of compensation direction, in the time that temperature variation is Δ t, make the first position of optical element offset 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 is for just, and its value is:
ΔL 3 = X 2 ΔL 2 X 1 = X 2 L 2 a 2 Δt X 1
As Δ L 1=Δ L 3time, the relative position variable quantity of the first optical element and the second optical element is 0, ensures that two optical element relative positions are constant, only needs to meet formula 1:
X 2 X 1 = L 1 a 1 L 2 a 2 Formula 1,
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.
2. the method that application lever principle according to claim 1 is carried out temperature compensation, is characterized in that:
Fulcrum block selects linear expansion coefficient to approach zero material, in order to ensure the constant of position of the fulcrum;
In the time that base material is identical with compensation bar material, only need to meet formula 2:
X 2 X 1 = L 1 L 2 Formula 2
Two optical element spacing do not vary with temperature and change.
3. 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 regulations and parameters, regulations and parameters fulcrum block, 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:
X 2 X 1 = L 1 a 1 L 2 a 2 ,
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.
CN201410183929.2A 2014-05-04 2014-05-04 A kind ofly apply the method and apparatus that lever principle carries out temperature compensation Active CN103941370B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111982078A (en) * 2019-05-21 2020-11-24 中国石油天然气股份有限公司 Precision laser monitoring device for stability of drilling platform and laser drift calibration method
CN112630920A (en) * 2020-12-07 2021-04-09 河北汉光重工有限责任公司 Wide-temperature self-adaptive optical window
CN115950637A (en) * 2023-03-09 2023-04-11 中国航发四川燃气涡轮研究院 High altitude platform thrust measurement frock based on temperature compensation pole

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111982078A (en) * 2019-05-21 2020-11-24 中国石油天然气股份有限公司 Precision laser monitoring device for stability of drilling platform and laser drift calibration method
CN111982078B (en) * 2019-05-21 2022-03-29 中国石油天然气股份有限公司 Precision laser monitoring device for stability of drilling platform and laser drift calibration method
CN112630920A (en) * 2020-12-07 2021-04-09 河北汉光重工有限责任公司 Wide-temperature self-adaptive optical window
CN112630920B (en) * 2020-12-07 2023-03-28 河北汉光重工有限责任公司 Wide-temperature self-adaptive optical window
CN115950637A (en) * 2023-03-09 2023-04-11 中国航发四川燃气涡轮研究院 High altitude platform thrust measurement frock based on temperature compensation pole

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