Device for detecting angle between light-passing surface and high-end side of side surface of circular wedge angle sheet

Abstract

The utility model relates to a device for detecting an angle between a light-transmitting surface and a side high-end edge of a circular wedge angle sheet. The device comprises a base, a horizontal image projection system, a precise rotating table, a sample bracket, a beam splitter prism, a cross scale plate and a laser light source. The utility model provides the device for detecting the angle between the light-passing surface and the high end edge of the side surface of the circular wedge angle sheet, when the angle between the required surface and the high end edge of the side surface is less than 90 degrees due to processing error of the circular wedge angle sheet to be detected and the angle between the surface and the high end edge of the side surface is less than 90 degrees, the two angles are very close at the moment, and the angle is less than 90 degrees. If the detection result is misjudged, the problem that the detection result is misjudged due to the fact that the detection result cannot be accurately recognized by using the existing detection equipment can be effectively solved by utilizing the device provided by the invention.

Description

Technical Field

[0001] This invention belongs to the field of optical testing, and more specifically, it relates to a device for detecting the angle between the light-transmitting surface of a circular wedge-shaped plate and the high-end edge of its side. Background Technology

[0002] In laser and optics applications, it's often necessary to fabricate circular wedges with angles around 30 degrees. These wedges eliminate interference fringes and help prevent cavity feedback. They can also protect laser output from environmental influences and are suitable for beam sampling applications. During fabrication, one surface must form a 90-degree angle with the high-end edge of the side, while the other surface, the wedge face, must have an angle less than 90 degrees with the high-end edge. To distinguish these two surfaces, an arrow is marked on the high-end edge pointing towards the wedge face. However, due to manufacturing errors, the required 90-degree angle between the surface and the high-end edge becomes less than 90 degrees, while the other wedge face already had an angle less than 90 degrees, resulting in the two angles being very close.

[0003] Existing detection methods employ laser reflection or self-collimation comparison. The principle is as follows: after light enters the product, a screen is placed at a certain distance to observe the reflected images on both surfaces. By rotating the product, the dimensions of two circular tracks can be obtained on the screen. These tracks can then be calculated to determine the angle between the light-transmitting surface and the high-side edge of the side. However, during product rotation, the light spot jumps, causing the circular track dimensions to fluctuate, thus reducing test accuracy. When the two angles are very close due to processing reasons, it becomes impossible to accurately measure the angle value or identify the wedge-shaped surface.

[0004] This invention can effectively solve the above problems. The circular wedge to be tested is placed flat on the sample holder of the device of this invention. The reference surface formed by the high and low ends of the circular wedge is adjusted to be precisely perpendicular to the optical axis of the horizontal image projection system by means of laser light source, beam splitter, rotating stage, cross scale plate, etc., so as to ensure that the angle acquired by the horizontal image projection system is the most accurate. This solution can greatly improve the detection accuracy and economic benefits. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a device for detecting the angle between the light-transmitting surface of a circular wedge and the high-end edge of its side.

[0006] This utility model discloses a device for detecting the angle between the light-transmitting surface and the high-end edge of a circular wedge-shaped plate. The device includes a base, a horizontal image projection system, a precision rotating stage, a sample holder, a beam splitter, a cross scale plate, and a laser light source. The image projection system is fixed above the base, the precision rotating stage is fixed in the middle of the base, the sample holder is fixed above the precision rotating stage, the beam splitter is located above the sample holder, the cross scale plate is located in front of the beam splitter, and the laser light source is located above the beam splitter.

[0007] The beam splitter has a beam splitting ratio of 50:50.

[0008] The wavelength of the laser source is 650nm.

[0009] The advantages of this invention are as follows: by combining a laser light source, a beam splitter, a rotating stage, and a cross scale, the reference surface formed by the high and low ends of the circular wedge plate is precisely perpendicular to the optical axis of the horizontal image projection system, ensuring that the angle acquired by the horizontal image projection system is the most accurate. This solution can greatly improve detection accuracy and economic benefits. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a device for detecting the angle between the light-transmitting surface of a circular wedge and the high-end edge of its side.

[0011] Figure 2 This is a schematic diagram of the structure used in the detection of circular wedge plates using this utility model.

[0012] In the diagram: 1. Base; 2. Horizontal image projection system; 3. Precision rotating stage; 4. Sample holder; 5. Beam splitter; 6. Cross scale plate; 7. Laser light source. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] like Figure 2 As shown, a device for detecting the angle between the light-transmitting surface and the high-end edge of a circular wedge-shaped plate includes a base 1, a horizontal image projection system 2, a precision rotating stage 3, a sample holder 4, a beam splitter 5, a cross scale plate 6, and a laser light source 7. The image projection system 2 is fixed above the base 1, the precision rotating stage 3 is fixed in the middle of the base 1, the sample holder 4 is fixed above the precision rotating stage 3, the beam splitter 5 is located above the sample holder 4, the cross scale plate 6 is located in front of the beam splitter 5, and the laser light source 7 is located above the beam splitter 5.

[0015] The beam splitter 5 has a beam splitting ratio of 50:50.

[0016] The laser light source 7 has a wavelength of 650nm.

[0017] Using the device described above, the sample to be tested is placed on the sample holder 4. After the laser from the laser source 7 enters the sample, due to the wedge angle, the reflected light from the front and back surfaces of the sample will be separated by an angle. After the reflected light passes through the beam splitter prism 5, part of the light enters the screen of the cross scale plate 6. At this time, observe whether the line connecting the two light spots is parallel to the vertical line of the cross scale plate 6. If they are not parallel, it means that the reference plane formed by the high and low ends of the sample to be tested is not perpendicular to the optical axis of the horizontal image projection system 2. At this time, the acquired angle is inaccurate. Fine-tune the precision rotating stage 3 so that the line connecting the two light spots is completely parallel to the vertical line of the cross scale plate 6. At this time, an accurate angle value can be acquired.

Claims

1. A device for detecting the angle between the light-transmitting surface and the high-end edge of a circular wedge-shaped plate, comprising a base, a horizontal image projection system, a precision rotating stage, a sample holder, a beam splitter, a crosshair scale, and a laser light source, characterized in that, The image projection system is fixed above the base, the precision rotating stage is fixed in the middle of the base, the sample holder is fixed above the precision rotating stage, the beam splitter is located above the sample holder, the cross scale plate is located in front of the beam splitter, and the laser source is located above the beam splitter.

2. The device for detecting the angle between the light-transmitting surface and the high-end edge of a circular wedge-shaped plate as described in claim 1, characterized in that: The beam splitter has a beam splitting ratio of 50:

50.

3. The device for detecting the angle between the light-transmitting surface and the high-end edge of a circular wedge-shaped plate as described in claim 1, characterized in that: The wavelength of the laser source is 650nm.

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