A method for precisely adjusting the installation angle of a 45-degree reflector

Abstract

The present invention discloses a method for precisely adjusting the installation angle of a 45-degree reflector. This method uses an electronic autocollimator to detect the angle of the 45-degree reflector. First, the optical path reference is transferred to a plane mirror using the electronic autocollimator. The combined optical path of the 45-degree reflector and the plane mirror is then used to detect the installation angle of the 45-degree reflector, allowing for real-time adjustment of the 45-degree reflector's installation direction. This method is simple to operate, offers high precision, and is highly real-time, ensuring the installation accuracy of optical components during assembly and adjustment.

Description

Technical Field

[0001] The invention relates to a method for accurately adjusting the installation angle of a 45-degree reflector, which can detect the installation angle of the 45-degree reflector in real time and ensure the installation accuracy of optical elements. Background Art

[0002] As people's requirements for communication distance and communication capacity continue to increase, the demand for space laser communication is growing. Traditional radio frequency communication can no longer meet the needs of long-distance, high-capacity communication. The optical carrier frequency of the space laser communication system is higher than that of radio frequency communication, and the available frequency band is wider. In addition, because the divergence angle of the outgoing beam is close to the diffraction limit, it has good directivity and low power. It solves the problems faced by radio frequency communication in space communication, such as limited communication rate, high power consumption, and low confidentiality. It has become one of the most promising communication modes.

[0003] During the alignment of the optical path in space laser communication systems, precise 45-degree reflectors are often required to deflect the optical path. The installation angle of the 45-degree reflectors directly determines the orientation of the optical axis of the optical system and affects the accuracy of the imaging position. Relying solely on machining accuracy cannot meet the required requirements. Trial-and-error adjustments, such as adjusting the mirror chamber and the translation of the reflectors, are inefficient and lack effective accuracy. Using a theodolite to calibrate the reflector angle allows for position adjustment, but the operation of the theodolite is complex and requires visual calibration, resulting in a certain degree of angular error.

[0004] The present invention proposes a method for adjusting the installation angle of a 45-degree reflector with high precision, which can effectively install a 45-degree folding mirror in the optical path of an optical system and realize real-time detection. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for precisely adjusting the installation angle of a 45-degree reflector. Figure 1 As shown, this method can accurately adjust and install a 45-degree reflector and consists of the following steps:

[0006] The electronic autocollimator 3 is aligned with the optical path reference mirror 2, and the azimuth and pitch of the plane reflector 4 are adjusted to align the optical path reference mirror 2 and the plane reflector 4; the electronic autocollimator 3 is moved to align with the other side of the optical path reference mirror 2 so that the light beam of the electronic autocollimator 3 hits the optical path reference mirror 2 and the plane reflector 4 at the same time, and the installation angle of the 45-degree reflector 1 is adjusted, and the return light spots of the optical path reference 2 and the 45-degree reflector 1 are compared, and the installation accuracy result is displayed on the display screen of the electronic autocollimator 3.

[0007] The present invention provides a method for high-precision installation of a 45-degree reflector by an optical method. This method can also achieve higher measurement accuracy by increasing the focal length of the autocollimator. When using an electronic autocollimator, it is impossible to directly see the light spot of the optical path reference mirror and the 45-degree reflector. The main working principle of the present invention is to convert the optical axis of the 45-degree reflector into an optical axis parallel to the autocollimator by shifting the optical axis, so that the installation error of the 45-degree reflector can be detected by the autocollimator. At the same time, as shown in the attached figure, Figure 2 As shown in FIG, the light emitted from the electronic autocollimator passes through the 45-degree reflector and then passes through the plane mirror again, and the angle error is magnified by two times, thereby improving the detection accuracy.

[0008] The advantages of this invention are mainly reflected in:

[0009] 1) Using a plane reflector as a relay for adjusting the 45-degree reflector can solve the problem of not being able to directly detect the installation angle of the 45-degree reflector with an electronic autocollimator;

[0010] 2) The installation angle error of the 45-degree reflector is magnified twice, which helps to improve the installation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the method for high-precision adjustment of the 45-degree reflector installation angle;

[0012] Figure 2 Schematic diagram of the angle error amplification when installing a 45-degree reflector. DETAILED DESCRIPTION

[0013] The following is combined with Figure 1 An embodiment of the method of the present invention is described in detail.

[0014] The main components used in the present invention are described as follows:

[0015] 1) 45-degree reflector 1: Customized 45-degree waisted reflector with a short-axis diameter of 40mm, a surface PV value better than 1 / 4λ, and an RMS value better than 1 / 20λ@632.8nm; the optical surface is coated with a reflective film, and the average reflectivity in the 400 to 850nm band is better than 97%.

[0016] 2) Optical path reference mirror 2: cubic prism, 15*15*15 mm3, five-sided silver coating, accuracy 0.002°, material K9.

[0017] 3) Electronic autocollimator 3: A TriAngle autocollimator from TRIOPTICS, model TA 300-57, was used.

[0018] 4) Plane Mirror 4: Customized plane mirror, 300mm diameter, surface PV value better than 1 / 10λ, RMS value better than 1 / 80λ@632.8nm; optical surface is silver-coated with protective film.

[0019] The schematic diagram of the experimental setup is as follows Figure 2 The specific steps are as follows:

[0020] Align the electronic autocollimator 3 with the optical path reference mirror 2, adjust the azimuth and pitch of the plane reflector 4, and align the optical path reference mirror 2 and the plane reflector 4; move the electronic autocollimator 3 to align with the other side of the optical path reference mirror 2 so that the light beam of the electronic autocollimator 3 hits the optical path reference mirror 2 and the plane reflector 4 at the same time, adjust the installation angle of the 45-degree reflector 1, compare the crosshairs returned by the optical path reference 2 and the 45-degree reflector 1, and display the installation measurement results on the display screen of the electronic autocollimator 3.

Claims

1. A method for precisely adjusting the installation angle of a 45-degree reflector, wherein the device used in the method comprises an optical path reference mirror (2), an electronic autocollimator (3), and a plane reflector (4), and is characterized in that The method for adjusting the 45-degree reflector installation angle is as follows: The optical path reference mirror (2) is a cubic prism, the electronic autocollimator (3) is aligned with the optical path reference mirror (2), and the azimuth and pitch of the plane reflector (4) are adjusted to align the optical path reference mirror (2) and the plane reflector (4); the position of the electronic autocollimator (3) is moved to align with the other side of the optical path reference mirror (2), and the light beam of the electronic autocollimator (3) hits the optical path reference mirror (2) and the plane reflector (4) at the same time, and the plane reflector (4) is used as a relay for adjusting the angle of the 45-degree reflector (1), and the installation angle of the 45-degree reflector (1) is adjusted, and the installation accuracy is detected on the display screen of the electronic autocollimator (3); After the position of the plane reflector (4) is adjusted using the electronic autocollimator (3), the optical path reference mirror (2) and the plane reflector (4) are used as a whole to adjust the optical path, and the installation angle is detected in real time on the electronic autocollimator (3).

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