A method for testing the parallelism of a light beam

Abstract

This invention belongs to the field of optical assembly and testing technology, specifically relating to a beam parallelism testing method. Using an autocollimator and a plane mirror, it can quickly and accurately determine the parallelism of the beam emitted from a large-aperture collimator. The required equipment is simple, the time is short, and the accuracy is high.

Description

Technical Field

[0001] This invention belongs to the field of optical assembly and testing technology, and specifically relates to a method for testing beam parallelism. Background Technology

[0002] In the field of optical assembly and testing, large-aperture collimators are often used to provide parallel outgoing light to simulate targets at infinity, establishing a reference for the optical axis position for the assembly and testing of optical systems. However, after the existing large-aperture collimators are debugged, during use, due to various factors such as the environment, the positions of the collimator's components deform, affecting the parallelism of the outgoing beam and making it impossible to provide high-quality parallel light as a reference for the assembly and testing of optical products.

[0003] The existing method for determining beam parallelism is as follows:

[0004] Using a pentaprism and a telescope, place the pentaprism on a guide rail and position it inside the light outlet of a large-aperture collimator. This will deflect the emitted light beam by 90° into the telescope. Observe the crosshair target of the large-aperture collimator through the telescope. Move the pentaprism along the guide rail from one side of the light outlet to the other. If the crosshair position of the observed large-aperture collimator target remains unchanged, it indicates that the emitted collimating beam from the large-aperture collimator is parallel.

[0005] This method can generally only detect parallelism in the horizontal direction, and the testing operation in the vertical direction is cumbersome. Summary of the Invention

[0006] In view of this, the present invention proposes a beam parallelism testing method, which can quickly and accurately determine the parallelism of the beam emitted from a large-aperture collimator by using an autocollimator and a plane mirror. The required equipment is simple, the time is short, and the accuracy is high.

[0007] To achieve the above-mentioned technical objectives, the specific technical solution adopted by the present invention is as follows:

[0008] A method for testing beam parallelism includes the following steps:

[0009] Step 1: Prepare an autocollimator with a crosshair target source and fix it on a bracket. The output port of the autocollimator should face the output port of the parallel beam to be measured. Adjust the azimuth and pitch of the autocollimator to receive the target source of the parallel beam and image it. Display the imaged target source on the monitor as the zero reference.

[0010] Step 2: Place a plane mirror directly in front of the autocollimator so that the beam emitted from the autocollimator returns via the plane mirror and forms an image on the display.

[0011] Adjust the azimuth and pitch of the plane mirror relative to the autocollimator so that the crosshair target on the display coincides with the zero reference.

[0012] Step 3: Rotate the autocollimator by the preset angle. The angle value of the crosshair image formed by the reflection of the light emitted from the autocollimator back by the plane mirror as the plane mirror moves is recorded as A.

[0013] Step 4: Remove the plane mirror, and the autocollimator re-receives the parallel beam and forms an image. Observe the angle between the crosshair image on the light tube's display and the zero reference, and record it as B. If B is half of A, then the parallel beam is parallel light.

[0014] Furthermore, the parallel beam is the output beam of the collimator.

[0015] Furthermore, the collimator is a large-diameter collimator.

[0016] Furthermore, the target source of the large-aperture parallel light tube is at infinity, and the target source is a dot matrix target source.

[0017] Furthermore, the target source of the large-aperture parallel light tube is at infinity, and the target source is a cross-shaped target source.

[0018] Furthermore, the target source of the large-aperture parallel light tube is at infinity, and the target source is a double cross-shaped target source. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the measurement process of a beam parallelism testing method according to a specific embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the display result of the display in a specific embodiment of the present invention;

[0022] The components include: 1. Autocollimator; 2. First support; 3. Large-diameter collimator; 4. Display; 5. Plane mirror; 6. Second support. Detailed Implementation

[0023] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0024] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0025] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0026] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The illustrations only show the components related to this disclosure and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0027] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0028] In one embodiment of the present invention, a method for testing beam parallelism is proposed, comprising the following steps:

[0029] Step 1: Prepare an autocollimator 1 with a crosshair target source and fix it on a bracket. The output port of the autocollimator 1 should face the output port of the parallel beam to be measured. Adjust the azimuth and pitch of the autocollimator 1 to receive the target source of the parallel beam and image it. Display the imaged target source on the display 4 as the zero reference.

[0030] Step 2: Place a plane mirror 5 directly in front of the autocollimator 1 so that the beam emitted from the autocollimator 1 returns via the plane mirror 5 and is imaged on the display 4.

[0031] Adjust the azimuth and pitch of the plane mirror 5 relative to the autocollimator 1 so that the crosshair target on the display 4 coincides with the zero reference.

[0032] Step 3: Rotate the autocollimator 1 by a preset angle. The angle value of the cross image formed by the reflection of the light emitted from the autocollimator 1 by the plane mirror 5 as the plane mirror 5 moves is recorded as A.

[0033] Step 4: Remove the plane mirror 5, and the autocollimator 1 re-receives the parallel beam and forms an image. Observe the angle between the crosshair image on the display 4 of the light tube and the zero reference, and record it as B. If B is half of A, then the parallel beam is parallel light.

[0034] In this embodiment, the parallel beam is the output beam of a collimator.

[0035] In this embodiment, the collimator is a large-diameter collimator 3.

[0036] In one embodiment, the target source of the large-aperture parallel light tube 3 is at infinity, and the target source is a dot matrix target source.

[0037] In one embodiment, the target source of the large-aperture collimator 3 is at infinity, and the target source is a cross-shaped target source.

[0038] In one embodiment, the target source of the large-aperture collimator 3 is at infinity, and the target source is a double cross-shaped target source.

[0039] The beam parallelism testing method provided in this embodiment uses the following equipment: a large-aperture collimator, an autocollimator, two rotating adjustment platforms, and a plane mirror. A schematic diagram of the apparatus used in the parallel beam parallelism testing method is shown below. Figure 1 As shown, the positional relationship of the cross images is as follows: Figure 2 As shown. The specific steps are as follows:

[0040] 1. First, fix the autocollimator 1 with the crosshair target source onto a first bracket 2, aligning it with the light outlet of the large-aperture collimator 3 to be tested, such as... Figure 1 As shown. The position is adjusted to receive the light emitted from the large-aperture collimator 3 and image it, which is then displayed on its own monitor 4. The position of the crosshair target o is recorded as a reference, as shown. Figure 2 As shown.

[0041] 2. Place a plane mirror 5 and its second adjustment bracket 6 directly in front of the autocollimator 1, and adjust the position of the plane mirror 5 relative to the autocollimator 1 so that the emitted autocollimator beam is reflected back by the plane mirror and imaged on its own display 4, coinciding with the original crosshair image position o.

[0042] 3. Rotate the first support 2 of the autocollimator 1 at a certain angle. The cross image formed by the light emitted from the autocollimator 1 after being reflected back by the plane mirror 5 will move twice the angle with the plane mirror. Record the angle value A of the cross image a relative to the reference o.

[0043] 4. Remove the plane mirror 5, and the autocollimator 1 receives the light emitted from the large-aperture collimator 3 again and forms an image. Observe the position b of the cross image on the display 4 of the light tube. If the angle value B of the position b of the cross image is half of the angle value A of the cross image a recorded when the plane mirror 5 was placed, then the light emitted from the large-aperture collimator 3 is parallel light.

[0044] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A method for testing beam parallelism, characterized in that, Includes the following steps: Step 1: Prepare an autocollimator with a crosshair target source and fix it on a bracket. The output port of the autocollimator should face the output port of the parallel beam to be measured. Adjust the azimuth and pitch of the autocollimator to receive the target source of the parallel beam and image it. Display the imaged target source on the monitor as the zero reference. Step 2: Place a plane mirror directly in front of the autocollimator so that the beam emitted from the autocollimator returns via the plane mirror and forms an image on the display. Adjust the azimuth and pitch of the plane mirror relative to the autocollimator so that the crosshair target on the display coincides with the zero reference. Step 3: Rotate the autocollimator by the preset angle. The angle value of the crosshair image formed by the reflection of the light emitted from the autocollimator back by the plane mirror as the plane mirror moves is recorded as A. Step 4: Remove the plane mirror, and the autocollimator re-receives the parallel beam and forms an image. Observe the angle between the crosshair image on the light tube's display and the zero reference, and record it as B. If B is half of A, then the parallel beam is parallel light.

2. The beam parallelism testing method according to claim 1, characterized in that, The parallel beam is the output beam from the collimator.

3. The beam parallelism testing method according to claim 2, characterized in that, The collimator is a large-diameter collimator.

4. The beam parallelism testing method according to claim 3, characterized in that, The target source of the large-aperture parallel light tube is at infinity, and the target source is a dot matrix target source.

5. The beam parallelism testing method according to claim 3, characterized in that, The target source of the large-aperture collimator is at infinity, and the target source is a cross-shaped target source.

6. The beam parallelism testing method according to claim 3, characterized in that, The target source of the large-aperture collimator is at infinity, and the target source is a double cross-shaped target source.

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