System and method for automatically measuring reflectivity of spherical reflector

Abstract

The invention belongs to the field of large-aperture spherical reflector reflectivity measurement, and discloses a spherical reflector reflectivity automatic measurement system and method. The method comprises the following steps: arranging a tray and a multi-dimensional mobile platform in a black box; a light source and a light intensity detection unit are carried on the multi-dimensional mobile platform; a spherical reflector to be measured is placed on the tray; for each to-be-detected point position on the spherical reflector, the positions of the light source and the light intensity detection unit are adjusted through the multi-dimensional mobile platform, so that a light beam emitted by the light source is incident to the current to-be-detected point position, the light intensity detection unit is used for detecting reflected light of the light beam reflected by the current to-be-detected point position, and the reflected light intensity is obtained; and obtaining the reflectivity of the current point location to be measured according to the incident light intensity and the reflected light intensity. According to the invention, not only can the reflectivity of the spherical reflector be automatically measured with high precision and the measurement efficiency be improved, but also the reflectivity of the spherical reflector can be directly measured and the accuracy is improved.

Description

Technical Field

[0001] This invention belongs to the field of large-aperture spherical mirror reflectivity measurement, and particularly relates to an automatic system and method for measuring the reflectivity of spherical mirrors. Background Technology

[0002] In recent years, the research and application of large-aperture observation equipment in my country has developed rapidly, involving the use of large-aperture spherical mirrors. The reflectivity of a mirror is a crucial optical indicator. For large-aperture spherical mirrors, measurements are typically taken indirectly using a pre-coated film or manually using handheld devices. These methods either fail to accurately reflect the mirror's reflectivity, are labor-intensive, or risk damaging the mirror's surface coating. Furthermore, direct or non-contact measurements of the reflectivity of large-aperture spherical mirrors are virtually nonexistent, and the measurement process itself faces numerous technical challenges.

[0003] Therefore, there is an urgent need for a system and method that can automatically measure the reflectivity of spherical mirrors. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes an automatic system and method for measuring the reflectivity of a spherical mirror. This method not only automates and precisely measures the reflectivity of a spherical mirror, improving measurement efficiency, but also directly measures the reflectivity of the spherical mirror, thus enhancing accuracy.

[0005] The technical solution of this invention is as follows: An automatic method for measuring the reflectivity of a spherical mirror, comprising the following steps: A tray and a multi-dimensional mobile platform are set inside the black box; the multi-dimensional mobile platform carries a light source and a light intensity detection unit. Place the spherical mirror to be tested on the tray; For each test point on the spherical reflector, the position of the light source and the light intensity detection unit is adjusted by the multi-dimensional moving platform so that the light beam emitted by the light source is incident on the current test point, and the light intensity detection unit is used to detect the reflected light after the light beam is reflected by the current test point to obtain the reflected light intensity. The reflectivity of the current test point is obtained based on the incident light intensity and the reflected light intensity.

[0006] Preferably, the control unit adjusts the incident angle of the light beam emitted by the light source, the detection direction of the light intensity detection unit, and the distance between the light intensity detection unit and the light source based on the radius of curvature of the spherical reflector and the position of the current test point.

[0007] Preferably, the incident direction vector of the light beam emitted by the light source is determined based on the incident point and the current test point; the incident angle of the light beam emitted by the light source is adjusted according to the incident direction vector; the reflection direction vector is determined according to the incident direction vector and the law of reflection; a ray is emitted from the current test point along the direction of the reflection direction vector to obtain the reflection point; the detection direction of the light intensity detection unit and the distance between the light intensity detection unit and the light source are determined based on the reflection point.

[0008] Preferably, the black box is further provided with an incident light intensity detection unit for measuring the incident light intensity.

[0009] Preferably, the light source is a spectral light source, an LED lamp, or a laser.

[0010] An automatic system for measuring the reflectivity of a spherical mirror, characterized in that it includes a black box, a tray, a multi-dimensional moving platform, a light source, a light intensity detection unit, a control unit, and a data processing unit; The black box contains the tray and the multi-dimensional mobile platform; The tray is used to place the spherical reflector to be tested; The light source and the light intensity detection unit are carried on the multi-dimensional mobile platform; The control unit is used to adjust the position of the light source and the light intensity detection unit according to each test point on the spherical reflector, so that the light beam emitted by the light source is incident on the current test point, and the light intensity detection unit is used to detect the reflected light after the light beam is reflected by the current test point to obtain the reflected light intensity. The data processing unit is used to obtain the reflectivity of the current test point based on the incident light intensity and the reflected light intensity.

[0011] Preferably, the control unit adjusts the incident angle of the light beam emitted by the light source, the detection direction of the light intensity detection unit, and the distance between the light intensity detection unit and the light source according to the radius of curvature of the spherical reflector and the position of the current test point.

[0012] Preferably, the control unit determines the incident direction vector of the light beam emitted by the light source based on the incident point and the current test point, adjusts the incident angle of the light beam emitted by the light source based on the incident direction vector, determines the reflection direction vector based on the incident direction vector and the law of reflection, emits a ray from the current test point along the direction of the reflection direction vector to obtain the reflection point, and determines the detection direction of the light intensity detection unit and the distance between the light intensity detection unit and the light source based on the reflection point.

[0013] The advantages of this invention are as follows: This invention can automatically obtain the reflectivity of a spherical mirror at different locations, achieving the purpose of measuring the reflectivity of a spherical mirror through a light source, a light intensity detection unit, a multi-dimensional moving platform, a control unit, and a data processing unit. The method is automated, with the control unit automatically measuring the reflectivity at different points and the data processing unit obtaining the reflectivity, making it accurate and efficient. Attached Figure Description

[0014] Figure 1 This is a diagram of the spherical reflector reflectivity measurement system of the present invention.

[0015] Figure 2 This is a flowchart of the measurement method of the present invention.

[0016] Reference numerals: 1-Black box, 2-Multidimensional moving platform, 3-Spherical reflector, 4-Tray, 5-Light intensity detection unit, 6-Light source, 7-Data processing unit, 8-Control unit. Detailed Implementation

[0017] To better illustrate the invention and enable those skilled in the art to better understand the invention, the method for measuring the reflectivity of a spherical mirror in the embodiments of the invention will be described in detail and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, and not all of them. Based on the embodiments of the invention, any other embodiments that can be obtained by those skilled in the art without creative effort should fall within the scope of protection of the invention.

[0018] In an optional embodiment of the present invention, the steps of the method for measuring the reflectivity of a spherical mirror are as follows: 1. Place the spherical mirror on the tray.

[0019] 2. Then place the spherical reflector and tray inside the black box.

[0020] 3. Inside the black box, there is a multi-dimensional mobile platform that carries the light source and light intensity detection unit.

[0021] 4. The light source emits a beam of light that shines on the spherical reflector. After being reflected by the spherical reflector, the beam of light is detected by the light intensity detection unit.

[0022] 5. In order to ensure that the light beam can be detected by the light intensity detection unit, the control unit needs to perform adaptive calculations based on the radius of curvature r of the spherical reflector and the position p of the light beam illumination, and then adjust the incident angle of the light beam, the direction of the light intensity detection unit, and the distance from the light source.

[0023] 6. Based on the above, complete the reflectivity measurement at one point, and then automatically measure the reflectivity at different positions of the spherical mirror as needed.

[0024] An optional embodiment of the present invention also provides an automatic system for measuring the reflectivity of a spherical mirror, characterized in that it includes a black box, a mirror tray, a multi-dimensional moving platform, a light source, a light intensity detection unit, a control unit, and a data processing unit; wherein, The black box provides a measurement environment for reflectivity, and the reflector and tray, multi-dimensional moving platform, light source and light intensity detector are all inside. Both the light source and the light intensity detection unit are mounted on the multi-dimensional mobile platform. The light intensity detection unit is connected to the data processing unit, and the multi-dimensional mobile platform is connected to the control unit. The light source can emit a near-parallel beam; The light intensity detection unit can measure the light intensity and convert it into a numerical value; The spherical reflector is used to reflect the light beam; The multi-dimensional mobile platform carries a light source and a light intensity detection unit, which can measure the reflectivity of the spherical reflector at different positions. It can adjust the emission angle of the light source beam, the distance from the light intensity detection unit, and the receiving angle of the light intensity detection unit, so that the light beam can be detected by the light intensity detection unit after reflection. The control unit is used to control the multi-dimensional moving platform to measure the reflectivity of the large-aperture spherical mirror at different positions. The data processing unit is used to obtain the incident light intensity I0 and the reflected light intensity I1, and then obtain the reflectivity R = I1 / I0.

[0025] In one alternative embodiment, the light source may be monochromatic light generated by a monochromator, a monochromatic LED, or a laser.

[0026] In one alternative embodiment, the light source can emit two beams of light, one for illuminating the reflector and the other for detecting the light intensity and stability of the light source.

[0027] In an optional embodiment, there may be two light intensity detection units, one for measuring reflected light intensity and the other for measuring incident light intensity; when measuring incident light intensity, the light intensity may be a certain proportion of the incident light intensity, which may be calibrated before measurement.

[0028] An optional embodiment of the present invention provides a spherical mirror curvature radius measurement system, such as... Figure 1As shown, the spherical reflector 3 is fixed on the tray 4, and both are placed inside the black box 1. The multi-dimensional moving platform 2 carries the photoelectric detection unit 5 and the light source 6, both of which can move and rotate on the multi-dimensional moving platform 2. The multi-dimensional moving platform 2 is operated by the control unit 8. The light intensity detection unit 5 is connected to the data processing unit 7, which processes light intensity information to obtain numerical information. During measurement, the light source 6 emits a near-parallel beam that strikes the spherical reflector 3 at the measurement location, and is then reflected and captured by the light intensity detection unit 5, which is then converted into numerical information by the data processing unit 7. The light intensity detection unit 5 and the light source 7 can move and rotate on the multi-dimensional moving platform according to the radius of curvature and installation position of the spherical reflector 3, as well as the detection point, ensuring that the reflected beam can enter the light intensity detection unit 5. There can be two light intensity detection units 5, simultaneously obtaining the emitted light intensity I0 of the light source 6. By comparing the incident light intensities I1 and I0, the data processing unit can obtain the reflectivity R = I1 / I0 at that point. After completing the reflectivity measurement at this location, move to the next location and perform the reflectivity measurement.

[0029] In an optional embodiment, the light source 6 can be a spectral light source of different wavelengths emitted by a monochromator, an LED lamp, or a laser. The movement of the multidimensional moving platform 2 is automatically completed by the control unit.

[0030] In an optional embodiment, the data processing unit 7 can record the incident light intensity and reflected light intensity values, and automatically complete the reflectivity calculation.

[0031] In an alternative embodiment, the data processing unit may be a computer.

[0032] In an alternative embodiment, the control unit may be a computer.

[0033] like Figure 2 As shown, the specific detection method is as follows: S1 mounts the spherical reflector on the tray; S2 places the tray along with the spherical mirror into the black box; S3 connects the multi-dimensional mobile platform and the control unit; S4 connects the light intensity detection unit to the data processing unit; S5 adjusts the position of the light source and light intensity detection unit on the multi-dimensional mobile platform, as well as their relative position and angle, through the control unit; S6 obtains the incident light intensity and reflected light intensity through the light intensity measurement unit and the data processing unit, and then obtains the reflectivity of that point. The S7 control unit moves the relative positions of the light source and light intensity detection unit with the spherical reflector according to the program to measure the reflectivity at different points.

[0034] The specific operating method is as follows: In S1, the spherical reflector is mounted and fixed on the tray. The purpose of the tray is to ensure that the spherical reflector can remain stable, and at the same time, the orientation of the spherical reflector can be finely adjusted so that reflectors with different radii of curvature can be placed stably upwards, which is beneficial for accurate subsequent reflectivity measurement.

[0035] In S2, the tray along with the spherical mirror is placed in a black box, mainly to shield the background light and improve measurement accuracy.

[0036] In S3, the multi-dimensional mobile platform and the control unit are connected. Under the program operation of the control unit, the multi-dimensional platform can realize three-dimensional translation, pitch and rotation.

[0037] In S4, the light intensity detection unit is connected to the data processing unit. The data processing unit can analyze and process the electrical signal obtained from the light intensity detector to obtain the light intensity value.

[0038] In S5, the position, relative position, and angle of the light source and light intensity detection unit on the multi-dimensional moving platform are adjusted via the control unit. Both the light source and the light intensity detection unit are located on the multi-dimensional moving platform, and their relative positions and angles are adjustable. The control unit can adjust the beam emission direction of the light source and the receiving direction of the light intensity detection unit. Their relative relationship can be automatically adjusted by the program based on the radius of curvature of the spherical reflector, the reflectivity of the test point, and the location of the reflectivity.

[0039] Given the point of incidence P 1( x 1, y 1, h The point to be measured on the spherical mirror, i.e., the spherical reflection point. P 3( x 3, y 3, z 3) Find the reflection point. P The steps for step 2 are as follows (assuming the center of the ball is the origin). O The equation of the plane parallel to the XY plane in the three-dimensional coordinate system XYZ is: z = h ): 1. Define a vector Incident direction vector (pointing towards the sphere): ; Sphere normal vector (pointing outward): , ; 2. According to the law of vector reflection Determine the reflection direction vector; 3. From the reflection point on the sphere P 3. Emit a ray along the reflection direction vector to obtain a ray perpendicular to the plane. z =h The intersection point is used as the reflection point. P 2; Based on the reflection point P 2. The detection direction of the light intensity detection unit and its distance from the light source can be determined; , , in yes P 3 z coordinate, It is a vector r of z Quantity.

[0040] Component form (for ease of calculation) set up P 1=( x 1, y 1, h ), P 3=( x 3, y 3, z 3), record D = x 32+ y 32+ z 32= r 2, then the intermediate quantity: Reflection vector components: in, >0 Key points: 1. Existence conditions: Requirements Not equal to 0; if =0, the reflected ray is parallel to the plane. It is at infinity (or does not exist).

[0041] 2. Physical rationale: In order for light rays to return to the plane, it is usually necessary to If the calculated value of t is greater than 0 (reflected light upwards), it means the reflected light is downwards and will not intersect with the upper plane.

[0042] 3. Geometric verification: , The incident ray, the normal, and the reflected ray satisfy the law of reflection with the center O of the sphere—the incident ray, the normal, and the reflected ray are coplanar, and the angle of incidence equals the angle of reflection.

[0043] Brief summary: yes The intersection point of the emitted reflected ray with the plane, and the direction of reflection, are obtained by symmetry of the incident vector about the normal.

[0044] In S6, the incident light intensity in front of the reflector can be directly obtained through the light intensity measurement unit, as well as the intensity of the reflected light. Two light intensity detection units can be used to simultaneously obtain the incident and reflected light intensities; then, the reflectivity at that point is obtained through the data processing unit.

[0045] In S7, the control unit moves the relative positions of the light source and light intensity detection unit with the spherical reflector according to the program, so as to measure the reflectivity at different points.

[0046] In practice, this invention uses a monochromator as the light source to obtain the spectral reflectivity at any point in the spherical mirror.

[0047] Although specific embodiments of the invention have been disclosed for illustrative purposes to aid in understanding and implementing the invention, those skilled in the art will understand that various substitutions, variations, and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the content disclosed in the preferred embodiments, and the scope of protection claimed by the invention is defined by the claims.

Claims

1. An automatic method for measuring the reflectivity of a spherical mirror, comprising the following steps: A tray and a multi-dimensional mobile platform are set up inside the black box; The multi-dimensional mobile platform carries a light source and a light intensity detection unit; Place the spherical mirror to be tested on the tray; For each test point on the spherical reflector, the position of the light source and the light intensity detection unit is adjusted by the multi-dimensional moving platform so that the light beam emitted by the light source is incident on the current test point, and the light intensity detection unit is used to detect the reflected light after the light beam is reflected by the current test point to obtain the reflected light intensity. The reflectivity of the current test point is obtained based on the incident light intensity and the reflected light intensity.

2. The method according to claim 1, characterized in that, The control unit adjusts the incident angle of the light beam emitted by the light source, the detection direction of the light intensity detection unit, and the distance between the light intensity detection unit and the light source based on the radius of curvature of the spherical reflector and the position of the current test point.

3. The method according to claim 2, characterized in that, The incident direction vector of the light beam emitted by the light source is determined based on the incident point and the current test point. The incident angle of the light beam emitted by the light source is adjusted according to the incident direction vector. The reflection direction vector is determined according to the incident direction vector and the law of reflection. A ray is emitted from the current test point along the direction of the reflection direction vector to obtain the reflection point. The detection direction of the light intensity detection unit and the distance between the light intensity detection unit and the light source are determined based on the reflection point.

4. The method according to claim 1, 2, or 3, characterized in that, The black box is also equipped with an incident light intensity detection unit for measuring the incident light intensity.

5. The method according to claim 1, 2, or 3, characterized in that, The light source is a spectral light source, an LED light, or a laser.

6. An automatic system for measuring the reflectivity of a spherical mirror, characterized in that, Includes a black box, tray, multi-dimensional moving platform, light source, light intensity detection unit, control unit, and data processing unit; The black box contains the tray and the multi-dimensional mobile platform; The tray is used to hold the spherical reflector to be tested; The light source and the light intensity detection unit are carried on the multi-dimensional mobile platform; The control unit is used to adjust the position of the light source and the light intensity detection unit according to each test point on the spherical reflector, so that the light beam emitted by the light source is incident on the current test point, and the light intensity detection unit is used to detect the reflected light after the light beam is reflected by the current test point to obtain the reflected light intensity. The data processing unit is used to obtain the reflectivity of the current test point based on the incident light intensity and the reflected light intensity.

7. The system according to claim 6, characterized in that, The control unit adjusts the incident angle of the light beam emitted by the light source, the detection direction of the light intensity detection unit, and the distance between the light intensity detection unit and the light source based on the radius of curvature of the spherical reflector and the position of the current test point.

8. The system according to claim 7, characterized in that, The control unit determines the incident direction vector of the light beam emitted by the light source based on the incident point and the current test point, and adjusts the incident angle of the light beam emitted by the light source according to the incident direction vector; determines the reflection direction vector according to the incident direction vector and the law of reflection, and emits a ray from the current test point along the direction of the reflection direction vector to obtain the reflection point; and determines the detection direction of the light intensity detection unit and the distance between the light intensity detection unit and the light source based on the reflection point.

9. The system according to claim 6, 7, or 8, characterized in that, The black box is also equipped with an incident light intensity detection unit for measuring the incident light intensity.

10. The system according to claim 6, 7, or 8, characterized in that, The light source is a spectral light source, an LED light, or a laser.

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