CN-115683566-B - Beam parallelism test method

CN115683566BCN 115683566 BCN115683566 BCN 115683566BCN-115683566-B

Abstract

The invention belongs to the technical field of optical assembly and testing, and particularly relates to a method for testing beam parallelism, which can realize rapid and accurate measurement of the parallelism of an emergent beam of a large-caliber collimator through an auto-collimator and a plane reflector, and has the advantages of simple required equipment, short time and high precision.

Inventors

KONG XIAOHUI
LIU LIANG
LI PENGHUI

Assignees

中国航空工业集团公司洛阳电光设备研究所

Dates

Publication Date: 20260505
Application Date: 20221012

Claims (6)

1. The method for testing the beam parallelism is characterized by comprising the following steps of: Preparing an autocollimator with a cross target source, fixing the autocollimator on a bracket, enabling a light outlet of the autocollimator to face a parallel light beam light outlet to be tested, adjusting the azimuth and pitching of the autocollimator to receive the target source of the parallel light beam and imaging, and displaying the imaged target source on a display as a zero reference; step two, a plane reflector is arranged right in front of the autocollimator, so that the emergent beam of the autocollimator returns through the plane reflector and is imaged on the display, Adjusting the azimuth and pitching of the plane reflector relative to the autocollimator to enable a cross target on the display to coincide with a zero reference; rotating the autocollimator for a preset angle, wherein the angle value of the cross image formed by reflecting the emergent light of the autocollimator back through the plane reflector along with the movement of the plane reflector is recorded as A; And step four, taking away the plane reflecting mirror, re-receiving and imaging the parallel light beams by the auto-collimator, recording the angle value between the cross image and the zero reference on the display of the observation light pipe as B, and if B is half of A, obtaining the parallel light beams as parallel light.
2. The beam parallelism test method according to claim 1, wherein the parallel light beam is an outgoing light of a collimator.
3. The method of claim 2, wherein the collimator is a large-caliber collimator.
4. The method of claim 3, wherein the target source of the large-caliber collimator is infinity, and the target source is a lattice target source.
5. The method of claim 3, wherein the target source of the large-caliber collimator is infinity, and the target source is a cross target source.
6. The method of claim 3, wherein the target source of the large-caliber collimator is infinity, and the target source is a double-cross target source.

Description

Beam parallelism test method Technical Field The invention belongs to the technical field of optical assembly and testing, and particularly relates to a beam parallelism testing method. Background In the field of optical adjustment and test, a large-caliber collimator is often required to provide emergent parallel light to simulate an infinity target for establishing an optical axis position reference so as to perform adjustment test of an optical system. However, in the use process after the existing large-caliber collimator is debugged, due to the influence of various factors such as environment, the positions of all parts of the collimator are deformed, so that the parallelism of outgoing beams is influenced, and high-quality parallel light cannot be provided as an optical product debugging reference. The existing test method for determining the beam parallelism comprises the following steps: The method comprises the steps of placing a pentaprism on a guide rail through the pentaprism and a telescope lens, placing the pentaprism in a light outlet of a large-caliber collimator tube, turning emergent light rays by 90 degrees to enter the telescope lens, observing a cross target of the large-caliber collimator tube through the telescope lens, moving the pentaprism from one side of the light outlet to the other side along the guide rail, and indicating that the emergent parallel light beams of the large-caliber collimator tube are parallel if the cross target cross position of the observed large-caliber collimator tube is unchanged. The method can only detect the parallelism in the horizontal direction generally, and the test in the vertical direction is complicated. Disclosure of Invention In view of the above, the invention provides a method for testing beam parallelism, which can realize rapid and accurate measurement of the parallelism of the emergent beam of a large-caliber collimator through an auto-collimator and a plane reflector, and has the advantages of simple required equipment, short time and high precision. In order to achieve the technical purpose, the invention adopts the following specific technical scheme: a method for testing beam parallelism, comprising the steps of: Preparing an autocollimator with a cross target source, fixing the autocollimator on a bracket, enabling a light outlet of the autocollimator to face a parallel light beam light outlet to be tested, adjusting the azimuth and pitching of the autocollimator to receive the target source of the parallel light beam and imaging, and displaying the imaged target source on a display as a zero reference; step two, a plane reflector is arranged right in front of the autocollimator, so that the emergent beam of the autocollimator returns through the plane reflector and is imaged on the display, Adjusting the azimuth and pitching of the plane reflector relative to the autocollimator to enable a cross target on the display to coincide with a zero reference; rotating the autocollimator for a preset angle, wherein the angle value of the cross image formed by reflecting the emergent light of the autocollimator back through the plane reflector along with the movement of the plane reflector is recorded as A; And step four, taking away the plane reflecting mirror, re-receiving and imaging the parallel light beams by the auto-collimator, recording the angle value between the cross image and the zero reference on the display of the observation light pipe as B, and if B is half of A, obtaining the parallel light beams as parallel light. Further, the parallel light beam is emergent light of the collimator. Further, the collimator is a large-caliber collimator. Further, the target source of the large-caliber collimator is infinity, and the target source is a lattice target source. Further, the target source of the large-caliber collimator is infinity, and the target source is a cross target source. Further, the target source of the large-caliber collimator is infinity, and the target source is a double-cross target source. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art. FIG. 1 is a schematic diagram of a measuring process of a beam parallelism test method according to an embodiment of the invention; FIG. 2 is a schematic diagram of a display result of a display according to an embodiment of the invention; the collimator comprises a collimator body, a collimator tube, a display, a plane mirror, a first bracket, a large-caliber collimator tube, a plane mirror and a second bracket. Detailed Description Embodiments of the present disclosure are described in detail