CN113607092A - Light small angle measuring method and system - Google Patents
Light small angle measuring method and system Download PDFInfo
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- CN113607092A CN113607092A CN202110825067.9A CN202110825067A CN113607092A CN 113607092 A CN113607092 A CN 113607092A CN 202110825067 A CN202110825067 A CN 202110825067A CN 113607092 A CN113607092 A CN 113607092A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C1/00—Measuring angles
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Abstract
The invention discloses a light small angle measuring method and a system, which at least comprise a telescope system, a cone lens, an image acquisition system, an image processing system and the like. The small-angle incident light passes through the telescopic system to obtain larger-angle incident light, the incident light reaches the side surface of the conical lens through the diaphragm to generate total reflection, the total reflection times of the light with different incident angles in the conical lens are different, and the light can be emitted from different positions of the side wall of the conical lens after the total reflection condition is not met, so different light spot images can be finally formed at different incident angles, the telescopic system plays a role in angle amplification and light flux improvement, the change of a tiny angle can enable the change of the light spot images to be more obvious after the change of the tiny angle is amplified by the telescopic system, and the angle measurement resolution is improved. The image acquisition system processes the image information after receiving the image, and calculates the real-time light incident angle according to the characteristic information of different light spot images, such as the symmetry axis, the centroid position, the area, the rotational inertia and the like. The invention has the advantages of high angle measurement resolution and simple measurement method.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a method and a system for measuring a small angle of light.
Background
The measurement of the incident angle of light is widely applied in the fields of basic research, test measurement, target detection and the like, and the measurement of the angle is an important component of a geometric measurement technology. Most of light incident angle measurement systems adopt an optical angle measurement method, in recent years, commonly used circular grating angle measurement methods, laser interference angle measurement methods and the like are widely applied and achieve higher measurement accuracy, but some problems to be solved still exist at present, firstly, breakthrough of measurement accuracy is achieved, once the measurement accuracy is improved by one magnitude, the detection capability of various applications related to space target detection can be greatly improved; secondly, the manufacturing and processing are difficult, the structure is complex and the cost is high. The method for measuring the light incidence angle through the light spot image has the advantages that the angle is enlarged by using a single cone lens in the prior patent publication No. CN111256649A, the measuring structure is simple, but the characteristic information of the light spot image obtained by the method is not monotonous and regularly changed, different light angles need to be processed in a segmented mode, the consistency cannot be guaranteed in precision, meanwhile, the problem that the area of the light spot image is too large, and image splicing may be involved in the actual implementation process exists.
Disclosure of Invention
The invention solves the problems: the method and the system for measuring the small angle of the light ray overcome the defects of the prior art, and have the advantages of high angle measurement resolution and simple measurement.
The principle of the invention is as follows: by utilizing the telescope system, the cone lens, the image acquisition system and the image processing system, incident light rays are amplified by the telescope system and then enter the large-end face of the cone lens through the diaphragm, total reflection is realized on the side face of the cone lens, the total reflection incidence angle is gradually reduced along with the increase of total reflection times, and finally the incident light rays are emitted from the side wall of the cone lens to form a light spot image which changes monotonously and regularly, and the same image processing method is adopted to process the characteristic information of the light spot image in the whole small-angle measurement range, namely, the corresponding light ray incidence angle is obtained through calculation.
In order to achieve the purpose, the invention adopts the following technical scheme:
one of the technical solutions of the present invention: a small-angle incident light enters from a telescopic system, realizes angle amplification after passing through the telescopic system, then enters the large end face of a conical lens to reach a side wall, is emitted out of the side wall of the conical lens through a plurality of times of total reflection to form a light spot image with characteristic information changing regularly, and the light spot image is subjected to image processing to obtain a light incident angle; the characteristic information comprises the direction of a symmetry axis, the position of a mass center, the area and the moment of inertia of the light spot image. As shown in fig. 4, the small angle interval of the incident light is
Wherein
Denotes the half cone angle of the axicon, n is the refractive index of the axicon material, and β is the magnification of the telescopic system. The angle interval of the light which is amplified by the angle of the telescopic system and then enters the big end face of the conical lens is
Wherein
Representing the half cone angle of the axicon, and n is the refractive index of the axicon material.
The light small angle measuring system for realizing the method comprises the following steps: the system comprises a telescope system, a diaphragm, a cone lens, an image acquisition system and an image processing system.
Incident light enters from the telescopic system, passes through the telescopic system, enters the large end face of the conical lens through the diaphragm, reaches the side wall, exits from the side wall of the conical lens to the image acquisition system, forms light spot images with characteristic information changing regularly, is displayed on the image display system, and can obtain the light incident angle after the light spot images are processed by the image processing system.
The telescope system adopts Galileo or Kepler telescope system, is arranged at the front end of the diaphragm and is coaxial with the diaphragm, and the lens is arranged at the front end of the diaphragm
At a small angle of light amplification of
The light with larger angle is incident to the cone lens, and the slight angle change of the incident light forms obvious angle change after passing through the telescopic system, thereby bringing obvious change of the light spot image characteristics and playing the roles of concentrating energy and improving precision;
the diaphragm is a circular through hole, has the size smaller than or equal to the caliber of the large end of the conical lens, is arranged on the surface of the large end of the conical lens and is coaxially arranged with the conical lens;
the parameters of the cone lens comprise a large-end aperture, a cone length, a cone angle, a material refractive index and the like, the cone lens with different parameters can form light spot images with different characteristic information, the light spot images are arranged at the rear end of the diaphragm and are coaxially arranged with the diaphragm, the end face of the large end of the cone lens is arranged in parallel with the receiving surface of the image acquisition system, the tip end of the cone lens is close to the receiving surface of the image acquisition system, incident light is totally reflected in the cone lens, the times of total reflection of the incident light at different angles are different, the incident light is emitted to the image acquisition system from different positions of the side wall of the cone lens after the total reflection condition is not met to form different light spot images, the light spot images formed by the incident light passing through the telescope system, the diaphragm and the cone lens can be completely received by the receiving surface of the single image acquisition system, and the characteristic information of the light spot images is regularly changed;
the image acquisition system has a complete receiving surface, does not lose image information, and can completely receive different light spot images formed by incident light rays with different angles after passing through the telescopic system, the diaphragm and the cone lens;
the image processing system processes different light spot images of the image acquisition system, and calculates corresponding different light ray incidence angles according to characteristic information in the different light spot images;
the image display system displays the received light spot image;
and the image display system is used for displaying the received light spot image.
The characteristic information with regular change comprises the direction of a symmetry axis, the area, the position of a mass center, the moment of inertia and the like.
Fig. 2 is a diagram showing the ray trajectories of rays propagating in the meridional and non-meridional planes of the axicon lens. In the meridian plane of the axicon, for example, the propagation path of the ray 1, the relationship between the height of the ray impinging on the image acquisition system and the incident angle is expressed as
Wherein L represents the cone length of the axicon lens, k represents the kth total reflection, alphakIs the angle theta between the incident ray and the normal direction of the wall of the axicon0Denotes the half-opening angle of the axicon, α denotes the angle of incidence of the light rays, and n is the refractive index of the axicon material. Different from the light path track in the meridian plane, the light path track of the incident light in the non-meridian plane is generally a spatial spiral broken line, the broken line can be a left-handed line or a right-handed line, when the incident angle of the light is greater than a certain value, the light can be refracted to a position far away from the center in the non-meridian plane of the cone lens by the light, such as the propagation track of the light 2, at the moment, the light spot image is necessarily split, the split image is overlarge, the image acquisition system in the prior art is difficult to completely receive, the image after the light spot is split is not changed in a linear rule, other characteristic information needs to be extracted, meanwhile, an image processing method needs to be changed, and finally, the situation that the measurement accuracy of different incident light angles is inconsistent is necessarily caused, so that the split image is not preferable, but the invention only aims at small-angle measurement,for small-angle incident light, the change of the light spot image is regularly changed, and the area of the light spot is moderate.
Further, the light spot information received by the image acquisition system is processed through an image processing method, and is compared or interpolated with the calibration data, so that the light incidence angle can be obtained.
Further, a light spot image with symmetry and regular change is received through an image acquisition system, and the alpha angle of the light ray in the figure 3 is determined by image characteristics such as the position and the area of a mass center; the direction of the image symmetry axis determines the azimuth angle β of the rays in fig. 3.
Compared with the prior art, the invention has the advantages that:
(1) the invention aims at the incident ray angle
The obtained light spot image characteristic information is monotonously and regularly changed, so that the incident angle can be calculated by processing the light spot image characteristic information in the whole small-angle measurement range by adopting the same image processing method, the measurement angle does not need to be processed in a segmented manner, and the light spots formed in the whole small-angle measurement range can be completely received by a receiving surface of a single image acquisition system. The invention has the advantages of high angle measurement resolution, simple measurement method and the like.
(2) The telescope system and the cone lens have the angle amplification effect, and the real-time light incident angle can be obtained by solving through the characteristic information of different light spot images, such as the direction of a symmetry axis, the position of a mass center, the area and the like. Compared with a method of directly adopting a cone lens, the method has the advantages that the angle change is more severe through the angle amplification of a telescopic system, and a more obvious and regularly changed light spot image is obtained through the cone lens, so that the measurement accuracy of the small-angle change of the light can be further improved; and the entrance pupil of the telescope system replaces the diaphragm in the prior patent publication No. CN111256649A, the luminous flux of the system is increased, and the signal-to-noise ratio of the image acquisition system is further improved.
Drawings
FIG. 1 is a schematic diagram of a system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of optical paths of light propagating in meridional and non-meridional planes of a axicon lens according to an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating an incident angle of a light beam according to an embodiment of the present invention;
FIG. 4 is a ray trace plot of rays propagating in a meridional plane of a axicon lens provided by an embodiment of the present invention;
fig. 5 is a simulation diagram of spot images formed on an image acquisition system by light rays with different incident angles according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method and a system for measuring a small angle of light. The system comprises a telescope system, a diaphragm, a cone lens, an image acquisition system and an image processing system, wherein incident light rays are amplified by the telescope system and then enter the large end face of the cone lens through the diaphragm to reach the side wall for total reflection, and then are emitted from the side wall of the cone lens to form a light spot image, and after characteristic information of the light spot image is processed by the image processing system, the corresponding light ray incident angle can be calculated. The following detailed description is made by way of example in connection with the accompanying drawings.
Examples
As shown in fig. 1-2, a system for measuring small angles of light according to the present invention comprises: a telescope system 2, a diaphragm 3, a cone lens 4, an image acquisition system 5, an image processing system 6 and an image display system 7. An incident light ray 1 is incident on an optical system from a telescopic system front port path, wherein:
parameters such as the magnification and the size of the telescopic system 2 need to be determined according to the parameters of the cone lens 4 and the image acquisition system 5. The too large magnification ratio can cause the over concentration of the light beam energy, and the formed light spot image is too small, thereby affecting the resolution ratio; if the magnification is too small, the angle amplification effect cannot be achieved, and the energy of the light beam is relatively dispersed.
During specific implementation, the telescope can be designed according to system requirements, an existing telescope module can be purchased, and the lenses and the cone lens 4 can be arranged coaxially during installation. In this embodiment, a galileo telescope system with a magnification of 5.3 times and a clear aperture size of 11mm is adopted, light rays with an incident angle of 0 to 3 ° are amplified by the telescope system into emergent light rays with an incident angle of 0 to 15.9 °, and a slight angle change of the incident light rays forms an obvious angle change after passing through the telescope system, so that an obvious change of a light spot image characteristic is brought, and the measurement accuracy of the light ray angle is improved.
The diaphragm 3 is circular in shape, and the installation parameters may include its distance from the axicon 4, and the like.
In specific implementation, the diaphragm can be placed close to the large-end face of the cone lens 4, and the size of the diaphragm is smaller than or equal to the caliber of the large end of the cone lens.
The parameters of the large end aperture, the cone length, the cone angle and the like of the cone lens 4 are determined according to the size parameters of the telescopic system 2. The installation parameters may include the distance between the telescopic system 2 and the axicon lens 4, the distance between the axicon lens 4 and the receiving surface of the image acquisition system 5, the angle between the end surface of the large end of the axicon lens 4 and the receiving surface of the image acquisition system 5, and the like.
During specific implementation, the telescopic system 2 and the conical lens 4 can be matched in size, the distance between the telescopic system and the conical lens 4 is short, the tip of the conical lens 4 is placed close to the receiving surface of the image acquisition system 5, and the large end surface of the conical lens 4 is parallel to the receiving surface of the image acquisition system 5. In this embodiment, the cone lens material is H-ZBAF21, the aperture of the large end is 10mm, the cone angle is 28.1 °, and the spot image formed by the 0 ° to 3 ° incident light passing through the telescope system, the diaphragm and the cone lens can be completely received by the receiving surface of the single image acquisition system, and the characteristic information of the spot image changes regularly.
The image acquisition system 5 is used for receiving a light spot image formed by incident light after passing through the optical system.
In specific implementation, image acquisition systems such as a CCD or a CMOS can be selected according to system requirements.
The image processing system 6 is used for processing the light spot image feature information received by the image acquisition system 5, including the symmetry axis direction, the area, the centroid position and the like of the light spot image.
During specific implementation, the corresponding incident ray azimuth angle information can be calculated by extracting the symmetry axis direction of the light spot image, and the angle information of the incident ray can be calculated by multiple ways such as the area and the centroid position of the light spot image, so that the measurement precision of the incident ray angle is ensured.
As shown in fig. 3, a spot image with symmetry and regular change is received by an image acquisition system, a coordinate system is established with a point projected by the tip of a cone lens onto a receiving surface of the image acquisition system as an origin, and the angle of inclination angle α of the light in fig. 3 can be determined by image characteristics such as centroid position, area and the like; the direction of the image symmetry axis determines the azimuth angle β of the rays in fig. 3.
In this example, the magnification of the telescopic system used was 5.3 times, the material of the axicon lens was H-ZBAF21, the aperture of the large end was 10mm, and the cone angle was 28.1 °. The light spot image formed after the incident light telescopic system and the cone lens is shown in fig. 5, wherein: (a) a light incident angle of 0 °, (b) a light incident angle of 0.2 °, (c) a light incident angle of 0.4 °, (d) a light incident angle of 0.6 °, (e) a light incident angle of 0.8 °, (f) a light incident angle of 1 °, (g) a light incident angle of 1.2 °, (h) a light incident angle of 1.4 °, (i) a light incident angle of 1.6 °, (g) a light incident angle of 1.8 °, (k) a light incident angle of 2 °, (l) a light incident angle of 2.2 °, (m) a light incident angle of 2.4 °, (n) a light incident angle of 2.6 °, (o) a light incident angle of 2.8 °, (p) a light incident angle of 3 °, wherein a telescopic system magnification of 5.3 is used, a refractive index of the cone lens material of 1.72, a large end diameter of 10mm, and a cone angle of 28.1 °.
In the figure 5, the light spot image can be completely received by the receiving surface of the image acquisition system without image splicing and other processing, the loss of image information is avoided to a certain extent, the characteristic information of the light spot image comprises the position and the area of a mass center and the like which are regularly changed in the whole 0-3-degree light incidence angle range, the angle information of the incident light and the characteristic information of the light spot image are in one-to-one correspondence relationship, a coordinate system is established by taking the point of the tip of the cone lens projected onto the receiving surface of the image acquisition system as an origin, and the characteristic information of the light spot image comprises the direction of a symmetry axis, the position of the mass center and the like,Processing the image with area, comparing with the calibration data or interpolating to obtain the angle information of the incident light according to the formula of the moment of inertia
Wherein (i)0,j0) The intersection point of the central axis of the conical lens and the imaging plane is represented, m and n represent the pixel size of the image, f (i, j) represents the gray value of the binarized image at the position, the incident angle is solved by adopting a method of moment of inertia, and the obtained measurement precision is improved by 32% compared with the precision of the prior patent publication No. CN 111256649A.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Those of ordinary skill in the art will understand that: modifications to the technical solutions described in the foregoing embodiments or equivalent replacements of some or all technical features may be made without departing from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A method for measuring small angle of light is characterized in that: the small-angle incident light enters from the telescopic system, is subjected to angle amplification after passing through the telescopic system, then enters the large-end face of the conical lens to reach the side wall, and is emitted from the side wall of the conical lens to form a light spot image with regularly-changed characteristic information, and the light spot image is subjected to image processing to obtain a light incident angle.
2. The method for measuring small angles of light rays according to claim 1, wherein: the angle of incidence to the large end face of the tapered lens after being amplified by the angle of the rear angle of the telescopic system meets the condition of total reflection on the side surface of the tapered lens if the angle of incidence to the large end face of the tapered lens meets the condition of total reflection on the side surface of the tapered lens
Denotes the half cone angle of the axicon lens, n denotes the coneThe refractive index of the lens material is such that when a light ray is incident from the large end face of the axicon lens at an angle of alpha, the angle of refraction of the light ray is alpha0When the light reaches the side wall on the meridian plane of the cone lens for the first time, the included angle between the light and the normal line of the side wall is alpha1When the axicon lens is placed in air
The condition for total reflection at the side walls on the meridian plane is
The angle interval of the light incident to the big end face of the conical lens is obtained
3. The method for measuring small angles of light rays according to claim 1, wherein: the small-angle interval of the incident light is obtained by calculation according to the angle interval alpha of the light incident to the large-end face of the conical lens, and the small-angle interval of the incident light is
Wherein
Denotes the half cone angle of the axicon, n is the refractive index of the axicon material, and β is the magnification of the telescopic system.
4. A light small angle measurement system is characterized in that: the system comprises: the system comprises a telescope system, a cone lens, an image acquisition system and an image processing system;
the exit window aperture of the telescopic system is larger than the aperture of the large end of the cone lens, small-angle light rays are amplified into large-angle light rays to be incident to the cone lens, and the entrance pupil of the telescopic system is used as a diaphragm of the measuring system to play a role in increasing the luminous flux of the system;
the cone lens is emitted from the side wall of the cone lens to form a light spot image with regularly changed characteristic information, the end face of the large end of the cone lens is placed in parallel with the receiving surface of the image acquisition system, and the tip end of the cone lens is close to the receiving surface of the image acquisition system;
the image acquisition system receives a light spot image with regularly changing characteristic information;
and the image processing system processes the light spot images and calculates to obtain corresponding different light incident angles according to the characteristic information in the different light spot images.
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