A high-precision angle measuring device and an angle measuring instrument thereof

Abstract

This application belongs to the field of measurement technology, specifically a high-precision angle measuring device. The invention proposes a high-precision angle measuring device in which light emitted from a light source 1 (white LED) is directly projected onto a fan-shaped optical code disk. The fan-shaped optical code disk uses a virtual rotating axis, and the barcode image on the fan-shaped optical code disk is directly projected onto a linear array sensor. The acquired barcode digital image is sent to a microprocessor for decoding to obtain the angle value. This device achieves a high-precision angle measurement of 0.001° while also being small in size, perfectly solving the shortcomings of existing methods and achieving high precision and low cost.

Description

Technical Field

[0001] This application belongs to the field of measurement technology, specifically a high-precision angle measuring device. Background Technology

[0002] Currently, in the field of physical optics instruments such as automatic polarimeters and automatic refractometers, high-resolution angle encoders are required to achieve high-precision angle measurements. These angle values ​​are then input into algorithmic formulas to measure various physical quantities. However, the market for high-precision absolute encoders with an accuracy of 0.001° is typically monopolized by foreign companies, and these encoders are quite expensive, often costing around 50,000 RMB, severely impacting the cost-effectiveness of domestically produced physical optics instruments. Furthermore, these encoders are relatively large (requiring rotating bearings, etc.) Figure 1 As shown in the image, this severely hinders the miniaturization of the instrument. Due to the instrument's usage characteristics, the measured angle range is relatively small; for example, the maximum angle measurement range of an automatic polarimeter is only ±90°, and that of an automatic refractometer is ±25°. Using a commercially available high-precision absolute encoder (with a measurement range of 360°) within such a small measurement range would be wasteful. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0004] To address the technical problems existing in current instruments using commercial high-precision absolute encoders, this invention proposes a high-precision angle measuring device. This device can achieve a high-precision angle measurement of 0.001° while also being small in size, perfectly solving the shortcomings of these devices and achieving high precision and low cost.

[0005] A high-precision angle measuring device includes a light source, a fan-shaped optical code disk, and a linear array sensor arranged in a vertically arranged relative to each other;

[0006] The fan-shaped optical code disk is provided with a code disk bracket on its inner side;

[0007] The inner side of the code disk bracket is provided with at least two sets of rotating shafts, and the outer side is provided with a friction shaft. The rotating shafts are tangent to the inner side of the code disk bracket, and the friction shafts are tangent to the outer side of the code disk bracket.

[0008] Preferably, the light source is an LED light source.

[0009] Preferably, the rotating shaft is a miniature bearing.

[0010] Preferably, it includes a spring, one end of which is fixed to the friction shaft and the other end of which is fixed to the inner side of the code disk bracket.

[0011] Preferably, the friction shaft is connected to the rotating structure of the instrument used for angle measuring via a coupling.

[0012] An angle measuring instrument, equipped with a high-precision angle measuring device as described in any of the preceding claims.

[0013] Preferably, the instrument used for angle measurement is either an automatic polarimeter or an automatic refractometer.

[0014] Compared with the prior art, the beneficial effects achieved by this application are:

[0015] 1. This structure uses a fan-shaped optical code disk, which saves space compared to a circular optical code disk, thus enabling the miniaturization of the angle encoder for the same accuracy.

[0016] 2. This structure uses a fan-shaped optical code disk. Compared with a circular optical code disk, the radius of the fan-shaped code disk can be much larger, which improves the marking accuracy of the code disk and achieves higher accuracy of the angle encoder.

[0017] 3. This structure uses the principle of three-point tangency to realize a virtual rotating axis with angular encoding (eliminating the need for a real rotating axis for a circular optical code disk), which can be located outside the instrument and can theoretically be infinitely large. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the embodiments of the present application to explain the application and do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of a commercial encoder;

[0020] Figure 2 This is a schematic diagram of the angle measuring device of this application;

[0021] Figure 3 This is a perspective view of the angle measuring device of this application;

[0022] In the diagram: 1. LED light source; 2. Optical code disk; 3. Linear array sensor; 4. Precision rotating shaft; 5. Code disk bracket; 6. Friction shaft; 7. Spring; 8. Miniature bearing; 9. Spring fixing hole. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] like Figures 1-3 As shown,

[0027] Figure 1 It is an existing technology encoder.

[0028] Figure 2 and Figure 3 The high-precision angle measuring device of this application is a light source 1 (white LED light) that is directly projected onto the optical code disk. The barcode image on the optical code disk is directly projected onto the linear array sensor. The collected barcode digital image is sent to the microprocessor for decoding to obtain the angle value.

[0029] The code disk bracket and two miniature bearings are internally tangential. The friction shaft is externally tangential to the code disk bracket via the preload of a spring. The other end of the spring is fixed in a spring fixing hole. The spring force is sufficient to ensure that the code disk bracket can rotate comfortably and smoothly. The friction shaft can be connected to the rotating structure of an instrument used for angle measurement via a coupling. (Since the code disk is absolutely encoded, the friction shaft and the code disk bracket do not rotate synchronously; the friction shaft only functions as a rotary encoder. The spring fixing hole is actually located on the instrument used for angle measurement.)

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A high-precision angle measuring device, characterized in that, This includes a light source, a fan-shaped optical code disk, and a linear array sensor arranged in a vertically aligned manner; The fan-shaped optical code disk is provided with a code disk bracket on its inner side; The inner side of the code disk bracket is provided with at least two sets of rotating shafts, and the outer side is provided with a friction shaft. The rotating shafts are tangent to the inner side of the code disk bracket, and the friction shafts are tangent to the outer side of the code disk bracket.

2. The high-precision angle measuring device as described in claim 1, characterized in that, The light source is an LED light source.

3. The high-precision angle measuring device as described in claim 1, characterized in that, The rotating shaft is a miniature bearing.

4. The high-precision angle measuring device as described in claim 1, characterized in that, It includes a spring, one end of which is fixed to the friction shaft and the other end of which is fixed to the inside of the code disk bracket.

5. A high-precision angle measuring device as described in claim 1, characterized in that, The friction shaft is connected to the rotating structure of the instrument used for angle measurement via a coupling.

6. An angle measuring instrument, characterized in that, Install a high-precision angle measuring device as described in any one of claims 1 to 5.

7. An angle measuring instrument as described in claim 6, characterized in that, The instrument used for angle measurement can be either an automatic polarimeter or an automatic refractometer.

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