Temperature-adjustable optical mirror bracket and two-dimensional inclination control method thereof

Abstract

The invention discloses a temperature control adjustable optical mirror bracket and a two-dimensional inclination control method thereof, relates to an optical technology, and particularly aims to solve the problems that an existing adjusting device in the background technology is of a complex mechano-electronic structure, and in some special use environments such as space, deep sea and other unattended and unmaintainable environments, the existing adjusting device cannot adjust the inclination of the optical mirror bracket. In the prior art, the reliability of a movement mechanism is poor, a large number of redundancy derating designs and backup designs are usually carried out to increase the reliability of the movement mechanism, and consequently an existing adjusting device is high in price and complex in structure, the optical mirror bracket with the temperature control adjusting function and the two-dimensional inclination control method thereof are simple in structure, convenient to operate and low in manufacturing cost, and the application range is wide. The device can be used in unattended and unmaintainable environments such as space and deep sea.

Description

Technical Field

[0001] The invention belongs to the technical field of optical frames, and in particular relates to a temperature-controlled optical frame and a two-dimensional tilt control method thereof. Background Art

[0002] The electrically controlled mirror frame with adjustable two-dimensional tilt angle has been widely used in optical systems. The main technical approach is to realize the two-dimensional tilt adjustment of the mirror frame by controlling the telescopic movement of components such as stepper motors, voice coil motors or piezoelectric ceramic motors by powering on. The above-mentioned stepper motors, voice coil motors or piezoelectric ceramic motors are electric components with the advantage of fast response speed, but because they contain relatively complex mechanical and electronic structures, in some special use environments, such as space, deep sea and other unmanned and non-maintainable environments, the reliability of the motion mechanism becomes the most worrying link in use. Usually, a large number of redundant derating designs and backup designs are carried out to achieve high reliability, resulting in a relatively expensive price.

[0003] Therefore, it is urgent to design a temperature-controlled optical frame and a two-dimensional tilt control method thereof to solve the above problems. Summary of the invention

[0004] In view of the defects of the above-mentioned prior art, the purpose of the present invention is to provide a temperature-controlled optical frame, which has the outstanding advantages of low price, simple structure, easy use and high reliability. It is particularly suitable for use in space and other places where high reliability is required and the control frequency of the tilt amount is not high, such as adjusting the static optical axis deviation of a certain optical component, etc., and the two-dimensional tilt control method of the optical frame is simple in principle, which further reduces the production cost of the optical frame.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A temperature-controlled and adjustable optical frame comprises a fixed plate, a movable plate and a plurality of temperature-controlled pillars. The temperature-controlled pillars are arranged between the fixed plate and the movable plate and are connected to the fixed plate and the movable plate.

[0007] Preferably, the feature is that the temperature control support comprises:

[0008] A support column connected to the fixed plate and the movable plate through a thermal insulation gasket;

[0009] A plurality of heating plates are arranged outside the supporting column;

[0010] Thermistor, arranged outside the support column;

[0011] Thermal insulation gaskets are arranged at both ends of the support column.

[0012] Preferably, the expansion coefficient of the support column is greater than 10×10 -6 / ℃, metal materials with Young's modulus greater than 50Gpa.

[0013] Preferably, the thermal insulation gasket is made of a material with a thermal conductivity of less than 1 W / m·K and a Young's modulus of greater than 50 GPa.

[0014] A second object of the present invention is to provide a method for two-dimensionally controlling the tilt of a temperature-controlled optical frame, the method comprising:

[0015] S1. Establish the XY axis coordinate system according to the actual installation situation of the optical frame;

[0016] S2. Based on the XY axis coordinate system, and according to the increase values ​​of the pitch angle and azimuth angle Δθx and Δθy, calculate the temperature difference ΔT of the corresponding temperature control support column x and ΔT y ;

[0017] S3. Based on ΔT x and ΔT y Set the initial temperature T0 of each temperature-controlled support column;

[0018] S4. Based on the temperature difference ΔT x and ΔT y , adjust the pitch angle and azimuth angle of the optical frame.

[0019] Preferably, in step S2, the temperature difference ΔT is calculated x and ΔT y The formula is:

[0020]

[0021] Where h is the height of the temperature control pillar and α is the expansion coefficient of the temperature control pillar.

[0022] Preferably, in step S3, the calculation formula of T0 is:

[0023] T0=T i +|ΔT x |+|ΔT y |

[0024] Where Ti is the ambient temperature.

[0025] Preferably, in step S4, the process of adjusting the pitch angle of the optical frame includes: adjusting the third temperature control support to T0+ΔT x , the temperature of the fourth temperature control pillar is adjusted to T0+ΔT x , the temperatures of the No. 1 temperature control pillar and the No. 2 temperature control pillar remain unchanged;

[0026] Among them, the connection point between the No. 1 temperature control pillar and the fixed plate is the origin O, and the connection point with the movable plate is P; the connection point between the No. 2 temperature control pillar and the fixed plate is the origin A, and the connection point with the movable plate is Q; the connection point between the No. 3 temperature control pillar and the fixed plate is the origin C, and the connection point with the movable plate is R; the connection point between the No. 4 temperature control pillar and the fixed plate is the origin B, and the connection point with the movable plate is S.

[0027] Preferably, in step S4, the process of adjusting the azimuth angle of the optical frame includes: adjusting the temperature of the third temperature control support to T0+ΔT y , the temperature of the second temperature control pillar is adjusted to T0+ΔT y , where T0 is the initial temperature, and the temperatures of the No. 1 temperature control pillar and the No. 4 temperature control pillar remain unchanged.

[0028] The beneficial effects of the present invention are as follows: the present invention discloses a temperature-controlled optical frame and a two-dimensional tilt control method thereof. Compared with the prior art, the present invention has the following improvements:

[0029] (1) The present invention solves the problem of two-dimensional tilt control of an optical frame in some special use environments, such as space, deep sea and other unattended and non-maintainable environments, through the design of a temperature control pillar. The temperature control pillar has a simple structure, is easy to operate and has a low manufacturing cost, which is conducive to its popularization and use.

[0030] (2) The principle of the tilt control method of the present invention is to use temperature to control the expandable metal material so that the height of the metal material changes, thereby performing two-dimensional tilt control on the optical mirror supported by the metal material. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the optical frame of the present invention;

[0032] Figure 2 This is a schematic diagram of the temperature control pillar structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the heating plate of the present invention;

[0034] Figure 4 It is a coordinate schematic diagram of the present invention;

[0035] Among them: 1-fixed plate; 2-temperature control pillar; 201-support pillar; 202-heating plate; 203-thermistor; 201-insulation gasket; 3-movable plate. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0037] Embodiment 1:

[0038] See attached Figure 1-3 As shown, a temperature-controlled and adjustable optical mirror frame comprises a fixed plate 1, a plurality of temperature-controlled pillars 2 and a movable plate 3, wherein the temperature-controlled pillars 2 are arranged between the fixed plate 1 and the movable plate 3, and are fixedly connected to the fixed plate 1 and the movable plate 3, and are used to isolate the fixed plate 1 and the movable plate 3, and in a normal state, the fixed plate 1 and the movable plate 3 are in a parallel state; and an optical mirror is arranged on the movable plate 3;

[0039] Specifically, the temperature control pillars 2 are arranged at equal intervals at the edge positions of the fixed plate 1 and the movable plate 3, and the plurality of temperature control pillars 2 form a triangle, a rectangle or other centrally symmetrical figures. In this embodiment, preferably, the temperature control pillars 2 are arranged in a square; wherein the temperature control pillars 2 can be fixedly connected with the fixed plate 1 and the movable plate 3 by threaded holes thereon or by applying a high-strength metal adhesive;

[0040] Further, the temperature control pillar 2 includes a support column 201, a plurality of heating plates 202, a thermistor 203 and a heat-insulating gasket 204. Both ends of the support column 201 are connected to the end surface of the fixed plate 1 and the bottom of the movable plate 3 through the heat-insulating gasket 204, wherein the heat-insulating gasket 204 is fixedly connected to the support column 201, and the heating plate 202 is fixed to the outside of the support column 201 by gluing or winding. A plurality of the thermistors 203 can be added according to actual needs. The thermistor 203 is in sheet form and is fixed to the outside of the support column 201 by gluing. The thermistor 203 and the heat-insulating gasket 204 are mature shelf products.

[0041] Furthermore, the support column 201 is made of metal, specifically aluminum alloy, stainless steel and the like, and the expansion coefficient of the selected material must be greater than 10×10 -6 / ℃, Young's modulus is greater than 50Gpa; the material of the thermal insulation gasket 204 can be selected from Dow fiberglass, quartz and other materials, and the thermal conductivity of the selected material is less than 1W / m·K, and the Young's modulus is greater than 50Gpa. The function of the thermal insulation gasket 204 is to prevent heat from being transferred to the fixed plate 1 and the movable plate 3, and at the same time avoid excessive consumption of heating energy.

[0042] The above-mentioned temperature-controlled and adjustable optical frame is connected to the mounting platform via a fixed plate 1. The principle of two-dimensional tilt control of the optical frame is as follows: utilizing the principle of thermal expansion and contraction, different temperature-controlled pillars 2 are controlled at set corresponding temperatures by a temperature controller, so that each temperature-controlled pillar 2 expands or contracts to different degrees when heated, and the two-dimensional tilt amount of the movable plate 3 can be changed, thereby realizing two-dimensional tilt control of the optical frame.

[0043] Specifically, the temperature controller is electrically connected to the heating plate 202 and the thermistor 203 respectively, and the heating plate 202 is powered by the temperature controller, so that the temperature of the heating plate 202 rises and is transmitted to the support column 201, causing it to expand due to heat, thereby achieving height adjustment of the support column 201. Among them, the thermistor 203 is used to detect the temperature of the support column 201 and feed it back to the temperature controller, and the temperature controller performs closed-loop temperature control according to the difference between the set temperature and the feedback temperature. This method is a mature method and has shelf products.

[0044] The specific control methods are as follows:

[0045] S1. Establish the XY axis coordinate system according to the actual installation situation of the optical frame;

[0046] In this step, there are four temperature control pillars 2, which are arranged in a square shape. Figure 4 As shown, the connection point between the No. 1 temperature control pillar 2 and the fixed plate 1 is the origin O, and the connection point with the movable plate 3 is P; the connection point between the No. 2 temperature control pillar 2 and the fixed plate 1 is the origin A, and the connection point with the movable plate 3 is Q; the connection point between the No. 3 temperature control pillar 2 and the fixed plate 1 is the origin C, and the connection point with the movable plate 3 is R; the connection point between the No. 4 temperature control pillar 2 and the fixed plate 1 is the origin B, and the connection point with the movable plate 3 is S; wherein, the connection line of OA is the X-axis, and the connection line of OB is the Y-axis, thereby establishing a coordinate system with XY axes;

[0047] The connection line OP is perpendicular to the fixed plate 1 and the movable plate 3, and the connection lines AQ, CR, and BS are parallel to the connection line OP, that is, they are also perpendicular to the fixed plate 1 and the movable plate 3, and OP = AQ = CR = BS;

[0048] S2. Based on the XY axis coordinate system, and according to the increase values ​​of the pitch angle and azimuth angle Δθx and Δθy, calculate the temperature difference ΔT corresponding to the temperature control pillar 2 x and ΔT y ;

[0049] Specifically, when the angle change of the mirror frame is required to be (Δθx, Δθy), that is, when the pitch angle increases by Δθx and the azimuth angle increases by Δθy, the temperature difference ΔT between the temperature control pillars 2 No. 3 and 2 No. 4 relative to the temperature control pillars 2 No. 1 and 2 is calculated using formula (1): x ,

[0050] Use formula (2) to calculate the temperature difference ΔT between the second temperature control pillar 2 and the third temperature control pillar 2 relative to the first temperature control pillar 2 and the fourth temperature control pillar 2 y , the azimuth angle can be adjusted by adjusting the temperature of the second temperature control pillar 2 and the third temperature control pillar 2;

[0051]

[0052] Wherein, h is the height of the temperature control pillar 2, and α is the expansion coefficient of the temperature control pillar 2;

[0053] S3. Based on ΔT x and ΔT y Set the initial temperature T0 of each temperature-controlled support column 2;

[0054] Specifically, considering that the present invention adopts a heating method for precise temperature control, the temperature of each support column must be greater than the ambient temperature to ensure that the temperature-controlled support column 2 can perform both cooling and heating operations based on the initial temperature, so as to meet the requirements of clockwise and counterclockwise rotation when both the azimuth and pitch angles are adjusted. Therefore, it is necessary to adjust the temperature of each temperature-controlled support column 2 to be greater than the ambient temperature, that is, the initial temperature T0 of each temperature-controlled support column 2 before adjustment, and then adjust the angle based on T0; wherein, T0=T i +|ΔT x |+|ΔT y |, Ti is the ambient temperature.

[0055] S4. Based on the temperature difference ΔT x and ΔT y and T0, to adjust the pitch and azimuth angles of the optical frame.

[0056] Method for adjusting the pitch angle of optical frame;

[0057] Specifically, the pitch angle adjustment can be completed by adjusting the temperature of the No. 3 temperature control pillar 2 and the No. 4 temperature control pillar 2. Specifically, the No. 3 temperature control pillar 2 is adjusted to T0+ΔT x , the temperature of the fourth temperature control pillar 2 is adjusted to T0+ΔT x , where T0 is the initial temperature, the temperatures of the No. 1 temperature control pillar 2 and the No. 2 temperature control pillar 2 remain unchanged, the surface PQRS where the movable plate 3 is located will rotate counterclockwise around the X-axis relative to the surface OABC where the fixed plate 1 is located, and the pitch angle of the mirror increases by Δθx; if ΔT x If it is a negative number, the surface PQRS where the movable plate 3 is located will rotate clockwise around the X-axis relative to the surface OABC where the fixed plate 1 is located;

[0058] Method for adjusting azimuth angle of optical frame;

[0059] Specifically, the azimuth angle can be adjusted by adjusting the temperature of the No. 3 temperature control pillar 2 and the No. 2 temperature control pillar 2; specifically, the temperature of the No. 3 temperature control pillar 2 is adjusted to T0+ΔT y , the temperature of the second temperature control pillar 2 is adjusted to T0+ΔT y, where T0 is the initial temperature, the temperatures of the No. 1 temperature control pillar 2 and the No. 4 temperature control pillar 2 remain unchanged, the surface PQRS where the movable plate 3 is located will rotate counterclockwise around the Y axis relative to the surface OABC where the fixed plate 1 is located, and the pitch angle of the mirror increases by Δθy; if ΔT y If it is a negative number, the surface PQRS where the movable plate 3 is located will rotate clockwise around the parallel Y axis relative to the surface OABC where the fixed plate 1 is located;

[0060] If further azimuth adjustment is required based on the adjusted pitch angle, adjust the third temperature control support 2 to T0+ΔT x +ΔT y , the temperature of the second temperature control pillar 2 is adjusted to T0+ΔT y , where T0 is the initial temperature, the temperature of the No. 1 temperature control pillar 2 remains unchanged at the initial temperature, and the temperature of the No. 4 temperature control pillar 2 remains at the temperature T0+ΔT when the pitch angle is adjusted. x ;

[0061] The principle of temperature control regulation to make the movable plate 3 tilt in two dimensions is to adjust the temperature of the temperature control pillar 2 to make it expand and contract, and then adjust its height to achieve the adjustment of the pitch angle and azimuth angle of the movable plate 3. The mathematical relationship between the temperature and height of the temperature control pillar 2 is as follows: Figure 4 As shown:

[0062] The height of the temperature control pillar 2 is h, which is the length of the line segment OP. The thermal expansion coefficient of the pillar is α, which makes the temperature of the third temperature control pillar 2 (CR) and the fourth temperature control pillar 2 (BS) higher than the temperature of the first temperature control pillar 2 (OP) and the second temperature control pillar 2 (AQ) by ΔTx, recorded as +ΔTx. The length change of the third temperature control pillar 2 and the fourth temperature control pillar 2 is:

[0063] Δh x =α×ΔT x ×h

[0064] Then the surface PQRS where the moving plate is located will produce a counterclockwise rotation (pitch angle adjustment) around the X-axis relative to the surface OABC where the fixed plate is located. The rotation angle of the pitch angle is:

[0065]

[0066] On the contrary, if the temperature of the third temperature control pillar 2 (CR) and the fourth temperature control pillar 2 (BS) is lower than the temperature of the first temperature control pillar 2 (OP) and the second temperature control pillar 2 (AQ) by ΔTx, recorded as -ΔTx, ​​then the surface PQRS where the moving plate is located will rotate clockwise around the X-axis relative to the surface OABC where the fixed plate is located (pitch angle adjustment), and the rotation angle of the pitch angle is:

[0067]

[0068] Similarly, the temperature control pillars 2 (AQ) and 2 (CR) produce a temperature change of +ΔTy relative to the temperature control pillars 2 (OP) and 2 (BS), and the length changes of the temperature control pillars 2 (AQ) and 2 (CR) are:

[0069] Δh y =α×ΔT y ×h

[0070] Then the surface PQRS where the moving plate is located will produce a counterclockwise rotation (azimuth adjustment) around the Y axis relative to the surface OABC where the fixed plate is located. The rotation angle of the azimuth is:

[0071]

[0072] The temperature of the second temperature control pillar 2 (AQ) and the third temperature control pillar 2 (CR) is changed by -ΔTy relative to the first temperature control pillar 2 (OP) and the fourth temperature control pillar 2 (BS). Then the surface PQRS where the moving plate is located will rotate clockwise around the Y axis relative to the surface OABC where the fixed plate is located (azimuth adjustment). The rotation angle of the azimuth is

[0073] The rotation angle of the azimuth is:

[0074]

[0075] Embodiment 2:

[0076] This embodiment is an application of the optical frame and method of embodiment 1, specifically:

[0077] The height of the temperature control pillar 2 is h = 10 mm, and the thermal expansion coefficient is 23.2×10 -6 / ℃, the initial temperature of each pillar is 20℃ (T0); when the pitch angle needs to be adjusted by +20 microradians, that is, Δθx=+20μrad, according to formula (1), the temperature change of the third temperature control pillar 2 and the fourth temperature control pillar 2 is ΔTx=+4.31℃

[0078] That is, the temperature of the No. 3 temperature control pillar 2 and the No. 4 temperature control pillar 2 needs to be raised to 24.31°C by the temperature controller, while the temperature of the No. 1 temperature control pillar 2 and the No. 2 temperature control pillar 2 is maintained at 20°C;

[0079] Furthermore, it is necessary to adjust the azimuth angle by +10 microradians on the basis of Δθx=20μrad, that is, Δθx=+10μrad. At this time, the relative temperature rise of the second temperature control pillar 2 and the third temperature control pillar 2 is ΔTy=+2.56℃.

[0080] That is, the temperature of the No. 2 temperature control pillar 2 rises from 20°C to 22.56°C, and the temperature of pillar 3 rises from 24.31°C to 26.87°C. At this time, the temperatures of the No. 1, No. 2, No. 3 and No. 4 temperature control pillars 2 are 20°C, 22.56°C, 24.31°C and 26.87°C respectively. The changes in the pitch angle and azimuth angle of the mirror can reach the expected Δθx=+20μrad and Δθy=+10μrad respectively.

[0081] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A temperature-controlled optical frame, comprising a fixed plate (1) and a movable plate (3), characterized in that: It also comprises a plurality of temperature control pillars (2), wherein the temperature control pillars (2) are arranged between the fixed plate (1) and the movable plate (3), and are connected to the fixed plate (1) and the movable plate (3).

2. The temperature-controlled optical frame according to claim 1, characterized in that: The temperature control support (2) comprises: A support column (201) is connected to the fixed plate (1) and the movable plate (3) via a heat insulating gasket (204); A plurality of heating plates (202) are arranged outside the support column (201); A thermistor (203) is arranged outside the support column (201); The heat insulating gaskets (204) are arranged at both ends of the support column (201).

3. The temperature-controlled optical frame according to claim 1, characterized in that: The support column (201) has an expansion coefficient greater than 10×10 -6 / ℃, metal materials with Young's modulus greater than 50Gpa.

4. The temperature-controlled optical frame according to claim 1, characterized in that: The thermal insulation gasket (204) is made of a material with a thermal conductivity of less than 1 W / m·K and a Young's modulus of greater than 50 GPa.

5. A method for two-dimensionally controlling the tilt of the temperature-controlled and adjustable optical frame according to claim 1, characterized in that: The method comprises: S1. Establish the XY axis coordinate system according to the actual installation situation of the optical frame; S2. Based on the XY axis coordinate system, and according to the increase values ​​of the pitch angle and azimuth angle Δθx and Δθy, calculate the temperature difference ΔT of the corresponding temperature control support column (2) x and ΔT y ; S3. Based on ΔT x and ΔT y Setting the initial temperature T0 of each temperature-controlled support column (2); S4. Based on the temperature difference ΔT x and ΔT y , adjust the pitch angle and azimuth angle of the optical frame.

6. The method according to claim 5, characterized in that: In step S2, the temperature difference ΔT is calculated. x and ΔT y The formula is: Wherein, h is the height of the temperature control pillar (2), and α is the expansion coefficient of the temperature control pillar (2).

7. The method according to claim 5, characterized in that: In step S3, the calculation formula of T0 is: T0=T i +|ΔT x |+|ΔT y | Where Ti is the ambient temperature.

8. The method according to claim 5, characterized in that: In step S4, the process of adjusting the pitch angle of the optical frame includes: adjusting the third temperature control support (2) to T0+ΔT x , the temperature of the fourth temperature control pillar (2) is adjusted to T0+ΔT x , the temperatures of the first temperature control pillar (2) and the second temperature control pillar (2) remain unchanged; Among them, the connection point between the No. 1 temperature control pillar (2) and the fixed plate (1) is the origin O, and the connection point with the movable plate (3) is P; the connection point between the No. 2 temperature control pillar (2) and the fixed plate (1) is the origin A, and the connection point with the movable plate (3) is Q; the connection point between the No. 3 temperature control pillar (2) and the fixed plate (1) is the origin C, and the connection point with the movable plate (3) is R; the connection point between the No. 4 temperature control pillar (2) and the fixed plate (1) is the origin B, and the connection point with the movable plate (3) is S.

9. The method according to claim 5, characterized in that: In step S4, the process of adjusting the azimuth angle of the optical frame includes: adjusting the temperature of the third temperature control support (2) to T0+ΔT y , the temperature of the second temperature control pillar (2) is adjusted to T0+ΔT y , where T0 is the initial temperature, and the temperatures of the No. 1 temperature control pillar (2) and the No. 4 temperature control pillar (2) remain unchanged.

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