CN111024001A - Roll angle measuring method and device - Google Patents
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- CN111024001A CN111024001A CN201911284309.7A CN201911284309A CN111024001A CN 111024001 A CN111024001 A CN 111024001A CN 201911284309 A CN201911284309 A CN 201911284309A CN 111024001 A CN111024001 A CN 111024001A
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Abstract
The disclosure relates to a roll angle measuring method and device. The method comprises the following steps: measuring phase change caused by object surface rolling by using a shearing speckle interferometry; and determining the roll angle of the object plane according to the phase change caused by the object plane roll. The method can effectively improve the measuring speed of the roll angle, and the shearing speckle interferometry relaxes strict mechanical and thermal stability requirements to a certain extent, so that the method can be suitable for roll angle measurement in non-experimental environments.
Description
Technical Field
The disclosure relates to the technical field of full-field light measurement, in particular to a roll angle measuring method and device.
Background
The measurement of the rigid body degree of freedom has obvious engineering significance and plays an important role in aspects of attitude control, precision machining and the like. For example, the method has wide application in the aspects of aircraft attitude control, accurate positioning of machine tool machining tools and the like.
The roll angle is one of six degrees of freedom of the rigid body, and the precise measurement of the roll angle can be used as the basis for angular displacement positioning and can also be used as the basis for effectively controlling the roll angle error. At present, a method for measuring a roll angle based on a digital speckle interference technology is provided, and full-field, non-contact and high-precision measurement can be realized. However, the real-time performance of the roll angle measurement based on the digital speckle interferometry is poor, and the aging requirement of the roll angle measurement in engineering application cannot be met.
Disclosure of Invention
In view of this, the present disclosure provides a roll angle measuring method and apparatus.
According to an aspect of the present disclosure, there is provided a roll angle measuring method including:
measuring phase change caused by object surface rolling by using a shearing speckle interferometry;
and determining the roll angle of the object plane according to the phase change caused by the object plane roll.
In one possible implementation, measuring phase changes caused by object plane roll using shear speckle interferometry includes:
before the object plane rolls, measuring first phase distribution information of the object plane by using the shearing speckle interferometry;
after the object surface is rolled, measuring second phase distribution information of the object surface by using the shearing speckle interferometry;
and determining the phase change caused by the object plane rolling according to the first phase distribution information and the second phase distribution information.
In one possible implementation, determining a roll angle of the object plane according to a phase change caused by the object plane roll comprises:
determining the spatial gradient of the object plane deformation caused by the object plane rolling in the shearing direction according to the phase change caused by the object plane rolling;
and determining the roll angle of the object plane according to the spatial gradient of the object plane deformation in the shearing direction caused by the object plane roll.
In one possible implementation, measuring phase changes caused by object plane roll using shear speckle interferometry includes:
in the process of rolling the object plane, measuring phase distribution information of the object plane within a preset time length by using the shearing speckle interferometry;
and determining the phase change of the target observation point on the object plane caused by the object plane rolling in the preset time according to the phase distribution information of the object plane in the preset time.
In one possible implementation, determining a roll angle of the object plane according to a phase change caused by the object plane roll comprises:
and determining the rolling angle of the object plane at each measuring moment in the preset time according to the phase change of the target observation point in the preset time caused by the rolling of the object plane.
According to another aspect of the present disclosure, there is provided a roll angle measuring device including:
the shearing speckle interferometry module is used for measuring phase change caused by object surface rolling by adopting a shearing speckle interferometry;
and the rolling angle measuring module is used for determining the rolling angle of the object plane according to the phase change caused by the object plane rolling.
In one possible implementation, the shearing speckle interferometry module includes:
the first measuring submodule is used for measuring first phase distribution information of the object plane by using the shearing speckle interferometry before the object plane rolls;
the second measurement submodule is used for measuring second phase distribution information of the object plane by the shearing speckle interferometry after the object plane rolls;
and the determining submodule is used for determining the phase change caused by the object plane rolling according to the first phase distribution information and the second phase distribution information.
In one possible implementation, the roll angle measuring module is specifically configured to:
determining the spatial gradient of the object plane deformation caused by the object plane rolling in the shearing direction according to the phase change caused by the object plane rolling;
and determining the roll angle of the object plane according to the spatial gradient of the object plane deformation in the shearing direction caused by the object plane roll.
In one possible implementation, the shearing speckle interferometry module includes:
the third measuring submodule is used for measuring the phase distribution information of the object plane within a preset time length by adopting the shearing speckle interferometry in the process of rolling the object plane;
and the second determining submodule is used for determining the phase change of the target observation point on the object plane caused by the object plane rolling in the preset time according to the phase distribution information of the object plane in the preset time.
In one possible implementation, the roll angle measuring module is specifically configured to:
and determining the rolling angle of the object plane at each measuring moment in the preset time according to the phase change of the target observation point in the preset time caused by the rolling of the object plane.
The method has the advantages that the phase change caused by the object surface rolling is measured by adopting the shearing speckle interferometry, the rolling angle of the object surface is determined according to the phase change caused by the object surface rolling, the measuring speed of the rolling angle can be effectively improved, and the shearing speckle interferometry relaxes strict mechanical and thermal stability requirements to a certain extent, so that the method can be suitable for the rolling angle measurement in the non-experimental environment.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
FIG. 1 illustrates a flow chart of a roll angle measurement method of an embodiment of the present disclosure;
FIG. 2 illustrates a schematic diagram of a shear speckle-based interferometry measurement of roll angle in accordance with an embodiment of the present disclosure;
FIG. 3 illustrates a block diagram of a roll angle measurement device in accordance with an embodiment of the present disclosure;
fig. 4 illustrates a block diagram of a measurement system of an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Generally, object plane roll (the roll axis about which the roll is perpendicular to the object plane) results in little distortion of the object plane, but results in large phase changes. The shear speckle interference technology capable of measuring deformation and strain (spatial gradient of deformation) is introduced into roll angle measurement for the first time, a brand new scheme of roll angle measurement is provided, and the technical scheme of the embodiment of the disclosure is described in detail below by combining with the accompanying drawings.
FIG. 1 illustrates a flow chart of a roll angle measurement method of an embodiment of the present disclosure. As shown in fig. 1, the method includes:
and step S11, measuring the phase change caused by the object plane rolling by using a shearing speckle interferometry.
Step S12 is to determine the roll angle of the object plane based on the phase change caused by the object plane roll.
The shearing speckle interference technology is a non-contact and full-field measurement optical technology, and has the advantages of simple structure, low vibration isolation requirement, strong reliability and high resolution. Shear speckle interferometry, a deformation sensitive technique, is commonly used to measure deformation and deformation related quantities such as strain and vibration, and is widely used in non-destructive inspection, but not in angular measurement of roll angle.
In one possible implementation, measuring phase changes caused by object plane roll using shear speckle interferometry includes: before the object surface rolls, measuring first phase distribution information of the object surface by using a shearing speckle interferometry; after the object surface is rolled, measuring second phase distribution information of the object surface by using a shearing speckle interferometry; and determining the phase change caused by the object plane rolling according to the first phase distribution information and the second phase distribution information.
And according to the shearing speckle interference information formed on the image sensor by the light rays entering the image sensor before and after the object plane rolls, the phase change caused by the object plane rolling can be acquired.
Fig. 2 shows a schematic diagram of a roll angle measurement based on a shearing speckle interferometry according to an embodiment of the present disclosure, as shown in fig. 2, a shearing speckle interferometry optical path has a dual-beam illumination optical path structure, light emitted from a laser 201 is split into two paths by a first beam splitter 202, namely, a first path of light and a second path of light, the first path of light is incident on an object plane (i.e., a surface of a measured object) after passing through a first reflector 203 and a first beam splitter 204, the first path of light has an incident angle of α, namely, the first path of light forms an angle with a roll axis z-axis α, the second path of light is incident on the object plane after passing through a second reflector 205, a third reflector 206 and a second beam splitter 207, and the second path of light has an incident angle of β, the first path of light and the second path of light after diffuse reflection on the object plane undergo shearing interference on an image sensor 208 after passing through a shearing device, wherein the shearing device is composed of a second splitter 209, a fourth reflector 210 and a fifth reflector 211, a piezoelectric ceramic tube 212 is disposed on a back surface of the fifth reflector 211, wherein an optical path of the piezoelectric ceramic tube 212 is controlled by an amount of light, and an optical path of the piezoelectric ceramic tube is introduced into an additional optical path, and an optical path is introduced on an additional optical path (z-axis) of the object plane, and a roll axis xoz, and a roll axis is parallel to an additional optical path is determined by an.
In order to simplify the calculation process, a symmetrical illumination optical path structure may be adopted, that is, two paths of light incident on the object plane are symmetrically distributed relative to the roll axis, that is, the incident angle α and the incident angle β are equal in size, and the following detailed description is given by the incident angle α and the incident angle β being equal in size.
The method comprises the steps that a shearing speckle interference pattern is collected before the object surface is rolled to determine first phase distribution information before the object surface is rolled, a shearing speckle interference pattern is collected after the object surface is rolled to determine second phase distribution information after the object surface is rolled, and phase change caused by the object surface rolling can be determined according to the difference value of the first phase distribution information and the second phase distribution information, wherein the phase change comprises the phase change caused by the object surface rolling of any point (x, y, z) on the object surface.
In one possible implementation, determining a roll angle of the object plane according to a phase change caused by the object plane roll comprises: determining the spatial gradient of the object plane deformation caused by the object plane rolling in the shearing direction according to the phase change caused by the object plane rolling; and determining the roll angle of the object plane according to the spatial gradient of the object plane deformation in the shearing direction caused by the object plane roll.
Still taking the above fig. 2 as an example, by using the shearing speckle interferometry optical path shown in fig. 2, when the shearing direction is in the x direction, according to the measured phase change caused by the object plane roll, the spatial gradient of the in-plane deformation u in the shearing direction caused by the object plane roll at any point in the object plane can be determined as follows:
wherein, λ is the wavelength of incident light adopted by the shearing speckle interferometry, namely the laser wavelength;
the phase change caused by the object plane roll.
Similarly, when the shearing direction is in the y direction, the spatial gradient of the in-plane deformation u caused by the object plane rolling at any point in the object plane in the shearing direction can be determined as follows:
when the object plane rotates by delta theta around the rolling axis, all points in the object plane are deformed. Establishing a polar coordinate system in the object plane by taking the center of the object plane as an origin, wherein before the object plane rotates around the rolling axis, the polar coordinate of any point in the object plane is (r, theta), and the rectangular coordinate thereof is (rcos theta, rsin theta); after the object plane rotates around the roll axis, the polar coordinate of any point in the object plane is (r, theta + delta theta), the rectangular coordinate thereof is (rcos (theta + delta theta), rsin (theta + delta theta)), and the component of the deformation caused by the roll of the object plane at the point in the x direction is:
the component in the y-direction is:
as can be seen, the deformation of any point on the object plane caused by the object plane roll is similar to the in-plane deformation (u, v) of the object plane, and therefore, according to (3) and (4), the following results are obtained:
the relationship between the in-plane deformation and the roll angle Δ θ can be determined according to the equations (5) and (6), and therefore, the in-plane deformation is measured, i.e., the roll angle can be obtained.
Also in the example of fig. 2, two light beams incident on the object plane are located in the xoz plane, and the partial derivatives (spatial gradient) of the in-plane distortion u in the x direction and the y direction are obtained by deriving the above equation (5):
it can be determined from equations (7) and (8) that the spatial gradients of the in-plane deformation in the x-direction and the y-direction are a function of the roll angle. The digital speckle interferometry needs to perform full-field phase processing (for example, operations such as filtering and unwrapping) according to the measured phase change caused by the object plane rolling, so as to determine the object plane deformation caused by the object plane rolling and the spatial gradient of the object plane deformation, and further determine the roll angle of the object plane, so that the roll angle measuring speed is reduced. Because the spatial gradient of the object plane deformation caused by the object plane rolling in the shearing direction can be directly determined according to the phase change caused by the object plane rolling measured by the shearing speckle interferometry, the roll angle of the object plane can be directly determined based on the spatial gradient, the roll angle measuring speed is effectively improved, and the aging requirement of the engineering application on the roll angle measurement can be met.
In one possible implementation, determining a roll angle of the object plane according to a phase change caused by the object plane roll comprises: and determining the roll angle of the object plane according to the phase change caused by the object plane roll, the wavelength of incident light adopted by a shearing speckle interferometry and the illumination angle of the incident light irradiated on the object plane.
From equations (2) and (8), it can be determined that the roll angle Δ θ of the object plane is:
when the roll angle is small, it can be determined according to equations (7) and (8):
from equations (2) and (11), it can be determined that the roll angle of the object plane is:
similarly, when the two light beams incident on the object plane are both located on the yoz plane, the roll angle of the object plane can also be determined by the above method, which is not described herein again.
In one possible implementation, measuring phase changes caused by object plane roll using shear speckle interferometry includes: in the process of rolling the object plane, measuring phase distribution information of the object plane within preset time by using a shearing speckle interferometry; and determining the phase change of the target observation point on the object plane caused by the object plane rolling in the preset time according to the phase distribution information of the object plane in the preset time.
In one possible implementation, determining a roll angle of the object plane according to a phase change caused by the object plane roll comprises: and determining the roll angle of the object plane at each measuring moment in the preset time according to the phase change of the target observation point in the preset time caused by the roll of the object plane.
Because the spatial gradient of the deformation of the object plane in the shearing direction caused by the rolling of the object plane can be directly obtained according to the shearing speckle interferometry, and the spatial gradients of the deformation of any point on the object plane in the shearing direction are the same, in the rolling process of the object plane, the shearing speckle interferometry measurement optical path shearing speckle interferometry is continuously acquired by the image sensor in the preset time length to obtain the phase distribution information of the object plane in the preset time length, so that only the target observation point (which can be any point on the object plane) on the object plane is concerned, the phase change of the target observation point caused by the rolling of the object plane in the preset time length is determined, the phase change of the target observation point is tracked only according to the phase change of the target observation point on the time axis, the rolling angle of the object plane at each measurement time in the preset time length can be determined, and the long-time monitoring of the rolling angle of the object plane is effectively realized, the aging requirement of roll angle measurement in engineering application is met.
The phase change caused by the object surface rolling is measured by adopting a shearing speckle interferometry, and then the rolling angle of the object surface is determined according to the phase change caused by the object surface rolling, so that the non-contact measurement of the rolling angle of the object surface can be realized, the measurement error is effectively reduced, and the shearing speckle interferometry relaxes strict requirements on mechanical and thermal stability to a certain extent, so that the method can be suitable for the rolling angle measurement in a non-experimental environment.
It is understood that the above-mentioned method embodiments of the present disclosure can be combined with each other to form a combined embodiment without departing from the logic of the principle, which is limited by the space, and the detailed description of the present disclosure is omitted. Those skilled in the art will appreciate that in the above methods of the specific embodiments, the specific order of execution of the steps should be determined by their function and possibly their inherent logic.
In addition, the present disclosure also provides a roll angle measuring device, an electronic apparatus, a computer-readable storage medium, and a program, which can be used to implement any one of the roll angle measuring methods provided by the present disclosure, and the corresponding technical solutions and descriptions and corresponding descriptions of the methods are referred to, and are not described again.
FIG. 3 illustrates a block diagram of a roll angle measurement device in accordance with an embodiment of the present disclosure. As shown in fig. 3, the apparatus 30 includes:
the shearing speckle interferometry module 31 is used for measuring phase change caused by object surface rolling by adopting a shearing speckle interferometry;
and the roll angle measuring module 32 is used for determining the roll angle of the object plane according to the phase change caused by the roll of the object plane.
In one possible implementation, the shearing speckle interferometry module 31 includes:
the first measuring submodule is used for measuring first phase distribution information of the object plane by a shearing speckle interference method before the object plane rolls;
the second measurement submodule is used for measuring second phase distribution information of the object plane by a shearing speckle interference method after the object plane rolls;
and the first determining submodule is used for determining the phase change caused by the object plane rolling according to the first phase distribution information and the second phase distribution information.
In one possible implementation, the roll angle measurement module 32 is specifically configured to:
determining the spatial gradient of the object plane deformation caused by the object plane rolling in the shearing direction according to the phase change caused by the object plane rolling;
and determining the roll angle of the object plane according to the spatial gradient of the object plane deformation in the shearing direction caused by the object plane roll.
In one possible implementation, a shear speckle interferometry module includes:
the third measuring submodule is used for measuring the phase distribution information of the object plane within the preset time length by adopting a shearing speckle interferometry in the process of rolling the object plane;
and the second determining submodule is used for determining the phase change of the target observation point on the object plane caused by the object plane rolling in the preset time length according to the phase distribution information of the object plane in the preset time length.
In one possible implementation, the roll angle measurement module is specifically configured to:
and determining the rolling angle of the object plane at each measuring moment in the preset time according to the phase change of the target observation point in the preset time caused by the rolling of the object plane.
In some embodiments, functions of or modules included in the apparatus provided in the embodiments of the present disclosure may be used to execute the method described in the above method embodiments, and specific implementation thereof may refer to the description of the above method embodiments, and for brevity, will not be described again here.
Embodiments of the present disclosure also provide a computer-readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the above-mentioned method. The computer readable storage medium may be a non-volatile computer readable storage medium.
An embodiment of the present disclosure further provides an electronic device, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to invoke the memory-stored instructions to perform the above-described method.
Embodiments of the present disclosure also provide a computer program product comprising computer readable code which, when run on a device, executes instructions for implementing a roll angle measurement method as provided in any of the above embodiments.
The disclosed embodiments also provide another computer program product for storing computer readable instructions that, when executed, cause a computer to perform the operations of the roll angle measurement method provided by any of the above embodiments.
Fig. 4 illustrates a block diagram of a measurement system of an embodiment of the present disclosure. As shown in fig. 4, the measurement system provided by the embodiment of the present disclosure includes: a shearing speckle interferometry subsystem 401, a processor 402, and a memory 403; the processor 402 is connected to the shearing speckle interferometry subsystem 401 and the memory 403, respectively, optionally the processor 402 can be communicatively connected to the shearing speckle interferometry subsystem 401 via a bus and a communication interface, and the processor 402 and the memory 403 can be communicatively connected via a bus.
The processor 402 is used for executing a program, and may specifically execute the relevant steps in the roll angle measurement method embodiment described above; for example, the program may include program code including computer operating instructions. The memory 403 is used for storing at least one instruction, which causes the processor 402 to perform the following operations: the shearing speckle interferometry subsystem 401 is controlled to measure the phase change caused by the object plane rolling, and the rolling angle of the object plane is determined according to the phase change.
The Memory 403 may include a Random Access Memory (RAM), and may further include a Non-volatile Memory (Non-volatile Memory), such as at least one disk Memory.
For specific implementation of each step in the program executed by the processor, reference may be made to corresponding descriptions in corresponding steps, modules, sub-modules, and units in the foregoing embodiments, and details are not described here again. It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described devices and modules may refer to the corresponding process descriptions in the foregoing method embodiments, and are not described herein again.
In the above embodiments of the present disclosure, the sequence numbers and/or the sequence orders of the embodiments are only for convenience of description, and do not represent the advantages or the disadvantages of the embodiments. The description of each embodiment has different emphasis, and for parts which are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. For the description of the implementation principle or process of the embodiments of the apparatus, device or system, reference may be made to the description of the corresponding method embodiments, which are not repeated herein.
Those of ordinary skill in the art will appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present disclosure. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
In the embodiments of the apparatus, method, system, etc. of the present disclosure, it is apparent that each component (system, subsystem, module, sub-module, unit, sub-unit, etc.) or each step may be decomposed, combined, and/or recombined after being decomposed. These decompositions and/or recombinations are to be considered equivalents of the present disclosure. Also, in the above description of specific embodiments of the disclosure, features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with or instead of the features in the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A roll angle measurement method, comprising:
measuring phase change caused by object surface rolling by using a shearing speckle interferometry;
and determining the roll angle of the object plane according to the phase change caused by the object plane roll.
2. The method of claim 1, wherein measuring the phase change caused by object plane roll using shear speckle interferometry comprises:
before the object plane rolls, measuring first phase distribution information of the object plane by using the shearing speckle interferometry;
after the object surface is rolled, measuring second phase distribution information of the object surface by using the shearing speckle interferometry;
and determining the phase change caused by the object plane rolling according to the first phase distribution information and the second phase distribution information.
3. The method of claim 2, wherein determining a roll angle of the object plane from the phase change caused by the object plane roll comprises:
determining the spatial gradient of the object plane deformation caused by the object plane rolling in the shearing direction according to the phase change caused by the object plane rolling;
and determining the roll angle of the object plane according to the spatial gradient of the object plane deformation in the shearing direction caused by the object plane roll.
4. The method of claim 1, wherein measuring the phase change caused by object plane roll using shear speckle interferometry comprises:
in the process of rolling the object plane, measuring phase distribution information of the object plane within a preset time length by using the shearing speckle interferometry;
and determining the phase change of the target observation point on the object plane caused by the object plane rolling in the preset time according to the phase distribution information of the object plane in the preset time.
5. The method of claim 4, wherein determining a roll angle of the object plane from the phase change caused by the object plane roll comprises:
and determining the rolling angle of the object plane at each measuring moment in the preset time according to the phase change of the target observation point in the preset time caused by the rolling of the object plane.
6. A roll angle measuring device, comprising:
the shearing speckle interferometry module is used for measuring phase change caused by object surface rolling by adopting a shearing speckle interferometry;
and the rolling angle measuring module is used for determining the rolling angle of the object plane according to the phase change caused by the object plane rolling.
7. The apparatus of claim 6, wherein the shearing speckle interferometry module comprises:
the first measuring submodule is used for measuring first phase distribution information of the object plane by using the shearing speckle interferometry before the object plane rolls;
the second measurement submodule is used for measuring second phase distribution information of the object plane by the shearing speckle interferometry after the object plane rolls;
and the first determining submodule is used for determining the phase change caused by the object plane rolling according to the first phase distribution information and the second phase distribution information.
8. The device of claim 7, wherein the roll angle measurement module is specifically configured to:
determining the spatial gradient of the object plane deformation caused by the object plane rolling in the shearing direction according to the phase change caused by the object plane rolling;
and determining the roll angle of the object plane according to the spatial gradient of the object plane deformation in the shearing direction caused by the object plane roll.
9. The method of claim 6, wherein the shearing speckle interferometry module comprises:
the third measuring submodule is used for measuring the phase distribution information of the object plane within a preset time length by adopting the shearing speckle interferometry in the process of rolling the object plane;
and the second determining submodule is used for determining the phase change of the target observation point on the object plane caused by the object plane rolling in the preset time according to the phase distribution information of the object plane in the preset time.
10. The device of claim 9, wherein the roll angle measurement module is specifically configured to:
and determining the rolling angle of the object plane at each measuring moment in the preset time according to the phase change of the target observation point in the preset time caused by the rolling of the object plane.
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