Global optical path adjusting device and adjusting method for correction lens group of solar imaging spectrometer

Abstract

The application discloses a kind of global light path adjusting devices and adjusting methods of correction lens group for solar imaging spectrometer, including correction lens group and adjustment shim, the front end of correction lens group is formed as first reference surface, the rear end of correction lens group is formed as second reference surface;The first reference surface of correction lens group is used as the reference of off-axis three-mirror optical system of global light path system of solar imaging spectrometer;The second reference surface of correction lens group is used as the reference of spectral scanning imaging system of global light path system of solar imaging spectrometer.The adjusting device and method of the application utilize the design of the form of self connection interface and the introduction of adjusting reference, reduce the difficulty of angle adjusting of lens group by means of external reference mirror in the prior art, can quickly and accurately connect the optical system of front end and rear end, ensure that the imaging quality of imaging spectrometer optical system is optimal.

Description

Technical Field

[0001] This invention relates to the field of space optics technology, and in particular to a global optical path assembly and adjustment method for a front and rear optical path docking and correction mirror assembly of a space solar imaging spectrometer. Background Technology

[0002] Exploring the Sun has broad astrophysical significance. Meanwhile, solar activity and its impact on the Sun-Earth space environment are the main targets of space weather forecasting. Therefore, solar imaging spectrometers are needed to observe and study solar activity.

[0003] Solar imaging spectrometers can achieve spectral scanning imaging. Their optical system mainly consists of three parts: a front-end off-axis three-mirror optical system, a rear-end spectral scanning imaging system, and a correction optical system connecting the two. The front-end off-axis three-mirror optical system and the correction optical system provide an image-side telecentric optical system for the rear-end spectral scanning imaging system. The correction optical system consists of three lenses with relatively fixed spatial positions. When assembled into a component, it forms a correction lens assembly, which connects the front and rear optical systems. Because the traditional method of connecting an external reference mirror to a lens assembly presents difficulties in angle adjustment measurement, improvements are needed in the optical assembly and adjustment device and method of the correction lens assembly within the global optical path to ensure optimal image quality and maintain image-side telecentricity. Summary of the Invention

[0004] The purpose of this invention is to provide a high-precision global optical path assembly and adjustment device and method for a solar imaging spectrometer. This method involves constructing dual reference surfaces on the calibration mirror assembly, ensuring accurate and rapid measurement of the optical axis orientation of the front-end off-axis three-reflector optical system through the calibration mirror assembly during optical assembly by using reference surfaces and the internal cavity of the calibration mirror assembly as common references, and adjusting and compensating the three rotational degrees of freedom of the calibration mirror assembly through an integrated adjustment shim. This allows for rapid and accurate connection of the optical systems at both ends to ensure optimal image quality of the imaging spectrometer's optical system.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The present invention provides a global optical path adjustment device for a calibration mirror assembly in a solar imaging spectrometer, the device comprising:

[0007] A calibration lens assembly, wherein the front end of the calibration lens assembly is formed as a first reference surface and the rear end of the calibration lens assembly is formed as a second reference surface;

[0008] The first reference plane of the correction mirror group serves as the reference for the off-axis three-mirror optical system of the global optical path system of the solar imaging spectrometer;

[0009] The second reference surface of the correction lens group is used as the reference of the spectral scanning imaging system of the global optical path system of the solar imaging spectrometer;

[0010] The adjusting device further comprises:

[0011] An adjusting shim is mounted on the bottom of the correction lens group.

[0012] Further, the flatness of the first reference surface is processed to 0.003 mm;

[0013] The flatness of the second reference surface is processed to 0.003 mm;

[0014] The cylindrical axis of the inner cavity of the lens barrel of the correction lens group is perpendicular to the first reference surface, and the perpendicularity precision of the cylindrical axis and the first reference surface is 0.005 mm;

[0015] The cylindrical axis of the inner cavity of the lens barrel of the correction lens group is perpendicular to the second reference surface, and the perpendicularity precision of the cylindrical axis and the second reference surface is 0.005 mm.

[0016] Further, the upper end of the correction lens group has an external reference lens interface;

[0017] The external reference lens is mounted on the upper end of the correction lens group through the external reference lens interface.

[0018] Further, the lens barrel of the correction lens group is formed with a lens barrel mounting portion at the position matched with the adjusting shim;

[0019] The lens barrel mounting portion extends towards the outside of the lens barrel, and the lens barrel mounting portion is symmetrically formed on both sides of the bottom of the lens barrel;

[0020] The adjusting shim is fixedly assembled with the lens barrel mounting portion.

[0021] Further, the adjusting shim is of an integrated structure, and the adjusting shim comprises:

[0022] A shim base and a shim mounting portion formed on the upper part of the shim base;

[0023] The shim mounting portion is fixedly assembled with the lens barrel mounting portion to correct the non-collinear error of the two optical axes of the off-axis three-mirror optical system and the first reference surface of the correction lens group through the adjusting shim.

[0024] The application discloses a high-precision correction lens group global optical path state adjusting method for a solar imaging spectrometer.

[0025] S101, the establishment of the optical axis reference of the correction lens group, the three optical lenses of the correction lens group are adjusted to ensure that the optical axes of the lenses are coincident with the axis of the inner cavity of the lens barrel, and the perpendicularity accuracy is 0.005 mm;

[0026] S102, the optical axis alignment of the correction lens group and the off-axis three-mirror optical system at the front end, after the off-axis three-mirror optical system at the front end is adjusted, the optical axis reference of the off-axis three-mirror optical system is established, and the optical axis of the off-axis three-mirror optical system is modified to be coaxial with the first reference surface of the correction lens group through the lead-out of the reference mirror of the off-axis three-mirror optical system at the front end;

[0027] S103, the correction lens group transmits the optical axis reference to the spectral scanning imaging system at the rear end, the second reference surface serves as the input reference of the spectral scanning imaging system at the rear end of the global optical system, and the pointing direction of the optical axis of the spectral scanning imaging system is adjusted to be collinear with the optical axis of the correction lens group.

[0028] Further, in the step S101, the azimuth of the optical axis of the off-axis three-mirror optical system at the front end is measured by a high-precision theodolite, the optical axes of the correction lens group and the off-axis three-mirror optical system at the front end are aimed at each other, the non-collinear error of the two optical axes is measured, and the non-collinear error is modified by adjusting the shims.

[0029] Further, the adjustment method further comprises the following steps:

[0030] S104, the external reference mirror is installed on the correction lens group through the external reference mirror interface, and the pointing direction of the optical axis of the correction lens group is reviewed by using the reference mirror.

[0031] In the above technical solution, the high-precision correction lens group global optical path adjustment device and adjustment method for a solar imaging spectrometer provided by the present application has the following beneficial effects:

[0032] The adjustment device and method of the present application utilize the design of the self-connected interface form and the introduction of the adjustment reference, reduce the difficulty of the angle adjustment of the lens group by means of the external reference mirror in the prior art, can quickly and accurately connect the optical systems at the front end and the rear end, and ensure that the imaging spectral imaging optical system has the optimal imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0034] Figure 1 The structure of a high-precision correction lens group global optical path adjustment device for a solar imaging spectrometer provided by an embodiment of the present application Figure One ;

[0035] Figure 2 A high-precision correction lens group global light path adjusting device for a solar imaging spectrometer Figure Two .

[0036] Marked as:

[0037] 1. Correction lens group; 2. Adjustment shim; 3. External reference lens interface;

[0038] 101. First reference surface; 102. Second reference surface; 103. Cylindrical axis; 104. Lens barrel inner cavity; 105. Lens barrel mounting portion;

[0039] 201. Shim base; 202. Shim mounting portion. DETAILED DESCRIPTION

[0040] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in conjunction with the drawings.

[0041] Referring to Figures 1-2 ;

[0042] Example one;

[0043] The high-precision correction lens group global light path adjusting device for a solar imaging spectrometer of the present embodiment one, the adjusting device comprises:

[0044] The front end of the correction lens group 1 is formed as the first reference surface 101, and the rear end of the correction lens group 1 is formed as the second reference surface 102;

[0045] The first reference surface 101 of the correction lens group 1 serves as the reference of the off-axis three-mirror optical system of the global light path system of the solar imaging spectrometer;

[0046] The second reference surface 102 of the correction lens group 1 serves as the reference of the spectral scanning imaging system of the global light path system of the solar imaging spectrometer;

[0047] The adjusting device further comprises:

[0048] The adjustment shim 2 is mounted at the bottom of the correction lens group 1.

[0049] Specifically, the first embodiment discloses a device for adjusting the global light path of a solar imaging spectrometer, which comprises a correction lens group 1 and a bottom adjustment pad 2. In order to provide a reference for the optical system at the front and back ends, the front end of the correction lens group 1 has a first reference surface 101, and the back end has a second reference surface 102. The first reference surface 101 is used as the reference of the off-axis three-mirror optical system at the front end, and the second reference surface 102 is used as the reference of the spectral scanning imaging system at the back end. By constructing double reference surfaces on the correction lens group 1, and machining the reference surfaces and the inner cavity of the lens barrel of the correction lens group 1 together, the optical adjustment can accurately and quickly measure the direction of the optical axis of the off-axis three-mirror optical system at the front end passing through the correction lens group 1, and adjust and compensate the rotational freedom of the correction lens group 1 through the adjustment pad 2 according to the non-collinear error of the two.

[0050] Preferably, the flatness of the first reference surface 101 of the first embodiment is machined to 0.003 mm;

[0051] The flatness of the second reference surface 102 is machined to 0.003 mm;

[0052] The cylindrical axis 103 of the inner cavity 104 of the lens barrel of the correction lens group 1 is perpendicular to the first reference surface 101, and the perpendicularity precision of the cylindrical axis 103 and the first reference surface 101 is 0.005 mm;

[0053] The cylindrical axis 103 of the inner cavity 104 of the lens barrel of the correction lens group 1 is perpendicular to the second reference surface 102, and the perpendicularity precision of the cylindrical axis 103 and the second reference surface 102 is 0.005 mm.

[0054] Firstly, the machining of the correction lens group 1 needs to ensure that the flatness of the first reference surface 101 and the second reference surface 102 is machined to 0.003 mm, and the polishing treatment is performed to ensure that the high-precision theodolite can directly perform angle precision measurement. Secondly, during machining, the cylindrical axis 103 of the inner cavity 104 of the lens barrel is perpendicular to the first reference surface 101 and the second reference surface 102, and the perpendicularity precision reaches 0.005 mm, and preferably better than 0.005 mm. The perpendicularity requirement is to establish an optical reference between the optical axis of the correction lens group 1 and the two reference surfaces.

[0055] Different from the method of adjusting the angle of the lens group by using an external reference mirror in the prior art, the device of the first embodiment uses the reference mirror as a review operation, specifically:

[0056] The upper end of the correction lens group 1 has an external reference mirror interface 3;

[0057] The external reference mirror is installed at the upper end of the correction lens group 1 through the external reference mirror interface 3.

[0058] Preferably, the lens barrel of the correction lens group 1 of the embodiment is formed with a lens barrel mounting portion 105 at a position where the adjusting pad 2 is fitted;

[0059] The lens barrel mounting portion 105 extends towards the outside of the lens barrel, and the lens barrel mounting portion 105 is symmetrically formed on both sides of the bottom of the lens barrel;

[0060] The adjusting pad 2 is fitted and fixed with the lens barrel mounting portion 105.

[0061] In order to cooperate with the lens barrel mounting portion 105 of the lens barrel, the adjusting pad 2 of the first embodiment is of an integrated structure, and the adjusting pad 2 comprises:

[0062] The pad base 201 and the pad mounting portion 202 formed on the upper part of the pad base 201;

[0063] The pad mounting portion 202 is fitted and fixed with the lens barrel mounting portion 105 to correct the misalignment error of the two optical axes of the off-axis three-mirror optical system and the first reference surface 101 of the correction lens group 1 by the adjusting pad 2.

[0064] Embodiment two:

[0065] The second embodiment of the present application discloses a high-precision correction lens group global optical path state assembling and adjusting method for a solar imaging spectrometer, which is based on the high-precision correction lens group global optical path state assembling and adjusting device for a solar imaging spectrometer as described above, and comprises the following steps:

[0066] S101, establishment of the optical axis reference of the correction lens group 1, which ensures that the optical axes of the three optical lenses of the correction lens group 1 coincide with the axis of the inner cavity of the lens barrel during assembling and adjusting, and the perpendicularity precision is 0.005 mm;

[0067] S102, alignment of the optical axes of the correction lens group 1 and the front off-axis three-mirror optical system, after the front off-axis three-mirror optical system is assembled and adjusted, the optical axis reference of the off-axis three-mirror optical system is established, and the optical axes of the off-axis three-mirror optical system and the first reference surface 101 of the correction lens group 1 are adjusted to be coaxial through the reference mirror of the front off-axis three-mirror optical system;

[0068] S103, the correction lens group 1 transmits the optical axis reference to the rear spectral scanning imaging system, the second reference surface 102 serves as the input reference of the spectral scanning imaging system at the rear end of the global optical system, and the optical axis direction of the spectral scanning imaging system is adjusted to be collinear with the optical axis of the correction lens group 1.

[0069] In the step S101, the azimuth of the optical axis of the front off-axis three-mirror optical system is measured by a high-precision theodolite, the optical axes of the correction lens group 1 and the front off-axis three-mirror optical system are aimed at each other, the misalignment error of the two optical axes is measured, and the misalignment error is corrected by the adjusting pad.

[0070] Secondly, the adjusting method further comprises the following steps:

[0071] S104, install the external reference mirror on the correcting lens group 1 through the external reference mirror interface 3, and check the optical axis direction of the correcting lens group 1 by using the external reference mirror. The adjusting method of the second embodiment uses the external reference mirror as a checking mechanism, and through the above-mentioned optical axis reference transmission method, the optical axis alignment accuracy of the optical system is within 5'', in addition, the correcting lens group 1 installs the external reference mirror through the reserved external reference mirror interface, as a checking link of the optical axis direction accuracy of the correcting lens group 1, and the error of the measured angle is avoided.

[0072] In the above technical solution, the adjusting device and method provided by the application have the following beneficial effects:

[0073] The adjusting device and method of the application reduce the difficulty of the angle adjustment of the lens group by means of the external reference mirror in the prior art, can quickly and accurately connect the front-end and rear-end optical systems, and ensure the optimal imaging quality of the optical system of the imaging spectrometer.

[0074] The above only describes some exemplary embodiments of the application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the application.

Claims

1. A global optical path adjustment device for a corrector lens group of a solar imaging spectrometer, characterized in that, The adjusting device comprises: A correction lens group (1), a front end of the correction lens group (1) is formed as a first reference surface (101), and a rear end of the correction lens group (1) is formed as a second reference surface (102); The first reference surface (101) of the correction lens group (1) serves as a reference of an off-axis three-mirror optical system of a global light path system of the sun imaging spectrometer; The second reference surface (102) of the correction lens group (1) serves as a reference of a spectral scanning imaging system of the global light path system of the sun imaging spectrometer; The adjusting device further comprises: An adjustment shim (2) mounted at a bottom of the correction lens group (1); A lens barrel of the correction lens group (1) is provided with a lens barrel mounting portion (105) at a position matched with the adjustment shim (2); The lens barrel mounting portion (105) extends towards an outside of the lens barrel, and the lens barrel mounting portion (105) is symmetrically formed at both sides of the bottom of the lens barrel; The adjustment shim (2) is fixedly assembled with the lens barrel mounting portion (105); The adjustment shim (2) is of an integrated structure, and the adjustment shim (2) comprises: A shim base (201) and a shim mounting portion (202) formed at an upper portion of the shim base (201); The shim mounting portion (202) is fixedly assembled with the lens barrel mounting portion (105) to correct an off-line error of two optical axes of the off-axis three-mirror optical system and the first reference surface (101) of the correction lens group (1) through the adjustment shim (2); An upper end of the correction lens group (1) is provided with an external reference mirror interface (3); An external reference mirror is mounted at the upper end of the correction lens group (1) through the external reference mirror interface (3).

2. The global optical path adjusting apparatus for a corrector lens group of a solar imaging spectrometer according to claim 1, characterized in that, The first reference surface (101) is machined to a flatness of 0.003 mm; The second reference surface (102) is machined to a flatness of 0.003 mm; A cylindrical axis (103) of a lens barrel inner cavity (104) of the correction lens group (1) is perpendicular to the first reference surface (101), and a perpendicularity precision of the cylindrical axis (103) and the first reference surface (101) is 0.005 mm; The cylindrical axis (103) of the lens barrel inner cavity (104) of the correction lens group (1) is perpendicular to the second reference surface (102), and a perpendicularity precision of the cylindrical axis (103) and the second reference surface (102) is 0.005 mm.

3. A method for assembling a global optical path of a corrector lens group for a solar imaging spectrometer, characterized in that, The adjusting method is based on the high-precision correction lens group global light path state adjusting device for the sun imaging spectrometer according to any one of claims 1 or 2, and the adjusting method comprises the following steps: S101, establishing an optical axis reference of the correction lens group (1), and ensuring that, when three optical lenses of the correction lens group (1) are adjusted, the optical axes of the lenses are coincident with and collinear with an axis of the lens barrel inner cavity (104), and the perpendicularity precision is 0.005 mm. S102, align the optical axis of the off-axis three-mirror optical system at the front end with the off-axis three-mirror optical system at the front end, after the off-axis three-mirror optical system at the front end is assembled and adjusted, the optical axis reference of itself is established, the optical axis of the off-axis three-mirror optical system is aligned with the first reference surface (101) of the correction lens group (1) through the lead-out of the reference mirror of the off-axis three-mirror optical system at the front end; S103, the correction lens group (1) transmits the optical axis reference to the spectral scanning imaging system at the rear end, the second reference surface (102) is used as the input reference of the spectral scanning imaging system at the rear end of the global optical system, and the optical axis direction of the spectral scanning imaging system is adjusted to be collinear with the optical axis of the correction lens group (1).

4. The method of claim 3, wherein the method is characterized by: In the step S101, the azimuth of the optical axis of the off-axis three-mirror optical system at the front end is measured by a high-precision theodolite, the optical axes of the correction lens group (1) are aimed at each other, the misalignment error of the two optical axes is measured, and the misalignment error is adjusted by adjusting the shims (2).

5. The method of claim 3, wherein the method is used for a global optical path adjustment of a corrector lens group for a solar imaging spectrometer. The assembly and adjustment method further includes the following steps: S104, install the external reference mirror on the correction lens group (1) through the external reference mirror interface (3), and check the optical axis direction of the correction lens group (1) by using the reference mirror.

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