CN201163179Y - An optical path parallel detector - Google Patents

Abstract

An optical path parallel detector, which consists of: a self-collimating collimator 1, a pentagonal prism 4, a pentagonal prism 5, and an optical wedge 6; the pentagonal prism 4 and optical wedge 6 are glued together to correct the manufacturing of the pentagonal prism Error, the angle processing error of pentagonal prism 4 should be controlled within 1 ', and the wedge angle of optical wedge 6 is twice of the angle processing error of pentagonal prism 4; The corresponding adjustment can be made according to the change of the distance, and the parallelism of the parallel light beams 2 and 3 at different distances can be detected, and the maximum adjustment distance can reach 1.5m.

Description

An optical path parallel detector

technical field

The utility model relates to an optical path parallel detector, which belongs to the technical field of optical axis parallelism detection.

Background technique

The current optical path parallelism detection device uses a large-diameter self-collimating collimator. When using it, the two parallel beams to be detected must be included in the aperture of the self-collimating collimator. The position of the two imaging points on the focal plane of the tube judges the parallelism accuracy of the two parallel beams (Reference: Multispectral Optical System Optical Axis Parallelism Combined Test Device, Zhan Qihai, Applied Optics, Issue 05, 2005). The existing technology has the following disadvantages. The aperture of the self-collimating collimator must be larger than the distance between the two parallel beams to be detected, which causes the aperture of the self-collimating collimator to increase with the distance between the two measured parallel beams. And increase. However, the increase in the manufacturing cost of the collimator is proportional to the third power or even the fourth power of the increase in aperture. When the diameter increases to about 500mm, it is difficult to process, the cost is very expensive, the manufacturing process is complicated, and the cycle is long.

Utility model content

In order to solve the problems of high cost of large-diameter self-collimating collimator, complex manufacturing process and long cycle, and inability to detect two parallel beams with relatively long distances, the utility model provides an optical path parallel detector.

As shown in Figure 1, the composition of a kind of optical path parallel detector that the utility model provides has: self-collimation collimator 1, pentagonal prism 4, pentagonal prism 5 and optical wedge 6; Described pentagonal prism 4 and optical wedge 6 Gluing is to correct the manufacturing error of the pentagonal prism. The angle processing error of the pentagonal prism 4 should be controlled within 1′, thereby reducing the processing accuracy and cost of the two pentagonal prisms 4 and 5, and improving the detection of the device at the same time Precision, the wedge angle of the optical wedge 6 is twice the angle processing error of the pentagonal prism 4; the distance between the two pentagonal prisms 4, 5 can be adjusted accordingly with the distance of the parallel beams 2, 3, so it can be used for different distances The parallelism of the parallel beams 2 and 3 is detected, and the maximum adjustment distance can reach 1.5m.

In the utility model, the characteristic that the parallel light beam is insensitive to the rotation of the pentagonal prism in the optical axis section is utilized, and the distance between the two pentagonal prisms 4 and 5 can be adjusted according to the distance between the two parallel light beams 2 and 3 to be measured. By making corresponding adjustments, the two parallel optical paths 2 and 3 with different distances can be detected. However, the influence of the rotation of the pentagonal prism in the other two directions on the light beam must be considered. Therefore, before the first use or after changing the distance between the pentagonal prism 4 and 5, an optical self-test must be carried out to ensure that the parallel beam that is folded and The original parallel beam 3 is parallel. During the optical self-test, a mercury box is used to provide a standard level.

Below in conjunction with accompanying drawing 2,3 further illustrate the optical self-inspection process of the present utility model.

Referring to FIG. 2 , the first step is to make the self-collimating collimator 1 self-collimate the upper surface of the stationary mercury box 7 so that the two crosses of the self-collimating collimator 1 coincide. In the second step, keep the self-collimating collimator 1 still, place the pentagonal prism 4 in front of the self-collimating collimator 1, and move the mercury box 7 to the bottom of the pentagonal prism 5. In the two steps, the upper surface of the mercury box 7 provides a standard horizontal plane, without considering the flatness of the lower surface of the mercury box. If in the second step, the two crosses in the self-collimating collimator 1 still overlap, it means that the deflected parallel beam is parallel to the original parallel beam 3 . But in practice, the optical parts must work under the load of the mechanical parts, and the movement of the optical parts is realized by moving the mechanical parts, and the mechanical processing cannot guarantee the optical precision requirements, so there must be a mechanical adjustment link. The specific mechanical support structure and adjustment links are shown in Figure 3. Guide rail 8 is responsible for bearing pentagonal prism 4,5, and the rigidity of guide rail 8 will be able to guarantee the accuracy requirement of the utility model device in self-checking and use process. The pentagonal prism 5 can slide along the guide rail 8, the pentagonal prism 4 is fixed on the adjusting curved plate 9, the adjusting curved plate 9 is fixed on the guide rail 8, the adjusting curved plate 9 has a long groove, and the pitch of the pentagonal prism 4 is adjusted by the elasticity of the material itself. The error caused by the sliding of the pentaprism 5 on the guide rail 8 is compensated. During the self-inspection process, the pentagonal prism 5 slides to a suitable position and locks it still. By adjusting the pitch adjustment of the curved plate 9, the two crosses of the self-collimating collimator 1 coincide. The transformed parallel beam is already parallel to the original parallel beam 3.

The dynamic detection process is as follows: after the optical self-inspection is completed, the measured parallel light beam 3 is bent 90 degrees by the pentagonal prism 5, and then passes through the optical wedge 6 and the pentagonal prism 4 placed within the aperture of the self-collimating collimator 1, and then It is deflected by 90 degrees and enters the self-collimating collimator 1 to form an image point on the focal plane of the self-collimating collimator 1. The measured parallel beam 2 is directly injected into the self-collimating collimator 1. Another image point is formed on the focal plane of the self-collimating collimator 1. If the two image points coincide, it means that the parallel light beams 2 and 3 are parallel, otherwise, according to the parallel light beams 2 and 3 on the focal plane of the self-collimating collimator 1 The distance between the image points formed on the surface and the focal length of the self-collimating collimator 1 are used to calculate the parallelism of the parallel light beams 2 and 3;

Beneficial effects: the device of the utility model can detect two parallel beams with a relatively long distance, and the distance can reach 1.5m. Reduce the aperture of the self-collimating collimator, and the cost increase of the large-diameter self-collimating collimator is proportional to the third power or even the fourth power of the aperture increase; The manufacturing error of the pentagonal prism, thereby reducing the machining accuracy and cost of the two pentagonal prisms 4,5, and improving the detection accuracy of the device simultaneously, in summary, the cost of the utility model system is very low, and the manufacturing process is simple and the cycle is short , capable of detecting two parallel beams that are relatively far apart.

Description of drawings

Fig. 1 is a schematic diagram of the optical structure of the present invention.

Fig. 2 is a schematic diagram of the optical self-inspection of the utility model.

Fig. 3 is a schematic diagram of the mechanical support and adjustment structure of the pentagonal prism in the system of the present invention.

Detailed ways

Example 1

Fig. 3 is a schematic diagram of the mechanical support and adjustment structure of this embodiment. After using for the first time or after adjusting the distance between the pentagonal prisms 4 and 5, an optical self-check will be performed, as shown in FIG. 2 . The first step is to make the self-collimating collimator 1 perform self-collimation on the upper surface of the stationary mercury box 7, so that the two crosses of the self-collimating collimator 1 coincide. In the second step, keep the self-collimating collimator 1 still, place the pentagonal prism 4 in front of the self-collimating collimator 1, move the mercury box 7 to the bottom of the pentagonal prism 5, and then adjust the pitch of the curved plate 9 to make the The two crosses of the self-collimating collimator 1 overlap, indicating that the deflected parallel beam is parallel to the original parallel beam 3, and the self-inspection process is completed. For the detection process of this embodiment, referring to Fig. 1, the measured parallel light beam 3 is deflected 90 degrees by the pentagonal prism 5, then passes through the optical wedge 6 and the pentagonal prism 4, and then is deflected 90 degrees and enters the autocollimating collimator 1 , an image point is formed on the focal plane of the self-collimating collimator 1, the measured parallel light beam 2 is directly injected into the self-collimating collimating light tube 1, and another image point is formed on the focal plane of the self-collimating collimating light tube 1 One image point, if the two image points coincide, it means that the two parallel beams 2 and 3 are parallel, otherwise the distance between the image points formed on the focal plane of the self-collimating collimator 1 is based on the two measured parallel beams 2 and 3 and the focal length of the self-collimating collimator 1 to calculate the parallelism of the two parallel beams 2 and 3 to be measured.

Claims (1)

1, a kind of light path parallel detector is characterized in that it constitutes: auto-collimation collimator (1), pentagonal prism (4), pentagonal prism (5) and wedge (6); Described pentagonal prism (4) and wedge (6) glued joint, and the foozle that is intended to proofread and correct pentagonal prism, the angle mismachining tolerance of pentagonal prism (4) should be controlled at 1 ' within, the angle of wedge of wedge (6) is the twice of pentagonal prism (4) angle mismachining tolerance; The spacing of two pentagonal prisms (4), (5) can be made corresponding adjustment with the variable in distance of parallel beam (2), (3), can detect the parallel beam (2) of different distance, the collimation of (3).

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