An angle measurement sensor based on a refractor

Abstract

The present invention relates to an angle measurement sensor based on a refractor, the angle measurement sensor comprising: a light source for emitting a light beam; a transmission component for connecting with a measured object, the transmission component being rotatable and provided with a plurality of light-transmitting holes along the circumference, through which the light beam emitted by the light source is transmitted; a first refractor for receiving the light beam emitted from the light-transmitting hole and refracting the light beam; a second refractor for receiving the light beam emitted from the light-transmitting hole and refracting the light beam; a first photodetector for receiving the light beam refracted by the first refractor and displaying its incident position; and a second photodetector for receiving the light beam refracted by the second refractor and displaying its incident position. The sensor can increase the magnification by lowering the angle at which the light beam is incident on the photodetector through the provision of the refractor.

Description

Technical Field

[0001] The invention relates to the field of measurement technology, and in particular to an angle measurement sensor based on a refractor. Background Art

[0002] Angle sensor is a commonly used geometric sensor, which is widely used in many fields such as aerospace, industrial production, mechanical manufacturing and military science. Figure 1 As shown, the Chinese patent with the patent number of 201510276409.0 and the name of "A continuous incremental optical arm amplification type high-precision angle sensor" discloses an angle sensor with a simple structure, which is suitable for measuring the continuous incremental changes in the angle of the object being measured, with reliable measurement and easy batch production. According to the basic principle of optical arm amplification type continuous angle measurement, the calculation process of the angle sensor is complicated, time-consuming, and has a complex structure. In addition, the measurement magnification of the angle sensor is related to the PSD incident angle, and the sensor magnification is easily affected, that is, when the incident angle of the light beam incident on the PSD increases, the measurement accuracy of the PSD itself will decrease. Summary of the invention

[0003] The purpose of the present invention is to improve the deficiencies in the prior art and provide an angle measurement sensor based on a refractor.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] An angle measurement sensor based on a refractor, comprising:

[0006] a light source for emitting a light beam;

[0007] A transmission component, the transmission component is used to connect with the object to be measured, the transmission component is rotatable and has a plurality of light-transmitting holes along the circumferential direction, the transmission component has a hollow part, the light source is located in the hollow part and at the center of the transmission component, and the position is fixed, and the light beam emitted by the light source is transmitted through the light-transmitting holes;

[0008] The first refractor is used to receive the light beam emitted from the light transmission hole and refract the light beam;

[0009] The second refractor is used for receiving the light beam emitted from the light transmission hole and refracting the light beam;

[0010] Photoelectric detector 1 receives the light beam refracted by refractor 1 and displays its incident position; it processes the light beam to obtain the object being measured;

[0011] The photodetector 2 is used to receive the light beam refracted by the refractor 2 and display its incident position, and during the measurement process, at least one of the photodetector 1 and the photodetector 2 can receive the light beam;

[0012] The processing system is specifically used to process and obtain the rotation angle value of the object to be measured according to the incident position change value of the light beam received by the photoelectric detector 1 and / or the photoelectric detector 2.

[0013] In a further solution, the first refractor is bonded to the first photodetector; and the second refractor is bonded to the second photodetector.

[0014] In a further embodiment, the light beam is P-polarized light.

[0015] In a further embodiment, the incident end face of the refractor one forms an angle less than 45° with the light beam incident to the refractor one, and the incident end face of the refractor two forms an angle less than 45° with the light beam incident to the refractor two.

[0016] An angle measurement sensor based on a refractor, comprising:

[0017] Laser beam one, laser beam two;

[0018] A reflective component, the reflective component is used to fix the object to be measured, the reflective component is rotatable and has a plurality of reflective surfaces along the circumference, each of the reflective surfaces is used to reflect the first laser beam and the second laser beam;

[0019] A refractor 1, used for receiving the laser beam 1 after being reflected by the reflective surface in the reflective component and refracting the laser beam;

[0020] A second refractor, used for receiving the laser beam reflected by the second laser beam from the reflective surface of the reflective component and refracting the laser beam;

[0021] Photoelectric detector 1, used for receiving the light beam refracted by refractor 1 and displaying its incident position;

[0022] Photoelectric detector 2, used for receiving the light beam refracted by refractor 2 and displaying its incident position;

[0023] The processing system obtains the rotation angle value of the object to be measured on the reflective component according to the incident position change value of the laser beam 1 received on the photoelectric detector 1 and / or the incident position change value of the laser beam 2 received on the photoelectric detector 2.

[0024] In a further embodiment, the invention further comprises at least one reflector 1 and at least one reflector 2;

[0025] The reflector 1 is arranged between the refractor 1 and the reflective component. The laser beam 1 is reflected by the reflective surface in the reflective component and then enters the reflector 1. The refractor 1 receives the laser beam reflected by the reflector 1 and refracts the laser beam. The photodetector 1 receives the laser beam refracted by the refractor 1 and displays its incident position.

[0026] The second reflector is arranged between the second refractor and the reflective component. The second laser beam is incident on the second reflector after being reflected by the reflective surface in the reflective component. The second refractor receives the laser beam reflected by the second reflector and refracts the laser beam. The second photodetector receives the laser beam refracted by the second refractor and displays its incident position.

[0027] In a further scheme, it also includes a light source, a spectroscope and at least one reflector. The light beam emitted by the light source is incident on the spectroscope and is reflected and transmitted to obtain the laser beam one and the laser beam two respectively. The laser beam one and the laser beam two are respectively reflected by two different reflecting surfaces of the reflecting component and refracted by two different refraction mirrors to be received by the corresponding photodetector one and photodetector two.

[0028] In a further solution, the first refractor is bonded to the first photodetector; and the second refractor is bonded to the second photodetector.

[0029] In a further embodiment, the laser beam 1 and the laser beam 2 are both P-polarized light.

[0030] In a further embodiment, the incident end face of refractor one forms an angle less than 45° with laser beam one incident to refractor one, and the incident end face of refractor two forms an angle less than 45° with laser beam two incident to refractor two.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] By setting the refractor, the magnification of the angle sensor is increased while reducing the angle of the light beam incident on the photodetector. Therefore, the angle sensor can reduce the influence of the magnification without being restricted by the angle of the reflective surface. In other words, the magnification can be increased.

[0033] Using P-polarized light as the incident light beam increases the intensity of the light beam incident on the photodetector after refraction and reduces the proportion of the incident light reflected by the refractor. In other words, the system's requirements for the incident light beam intensity can be reduced.

[0034] Through the action of the refractor, the laser with a large incident angle is refracted and incident on the PSD at a small angle, which not only improves the PSD measurement stability, but also further improves the angle measurement accuracy of the sensor according to the trigonometric relationship. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 The present invention is a schematic diagram of measuring the rotation angle of an object by using a continuous incremental optical arm amplification type angle sensor in the prior art.

[0037] Figure 2 This is a schematic diagram of the angle sensor provided in Example 1.

[0038] Figure 3 Schematic diagram of the structure of the transmission component in Example 1.

[0039] Figure 4 Schematic diagram of the positional relationship between the light source and the photodetector in Example 1.

[0040] Figure 5 This is a schematic diagram of the principle of the angle sensor in Example 2.

[0041] Figure 6 Schematic diagram of the principle of the angle sensor in Example 3.

[0042] Figure 7 This is a schematic diagram of the principle of using one laser source to obtain two laser beams in Example 3.

[0043] Description of symbols in the figure

[0044] Light source 1, light beam 2, laser beam one 3, laser beam two 4, transmission component 5, light transmission hole 6, photodetector one 7, photodetector two 8, hollow part 9, transmission part 51, positioning part 52, refractor one 10, refractor two 11, beam splitter 12, reflector 13, reflecting surface 14, reflector one 15, reflecting component 16. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present invention.

[0046] like Figure 2As shown, this embodiment provides an angle measurement sensor based on a refractor, including a light source 1, a transmission component 5, a refractor 10, a refractor 2 11, a photodetector 1 7, a photodetector 2 8 and a processing system.

[0047] Among them, the transmission component 5 is used to connect with the object to be measured. The transmission component 5 can rotate and then rotate with the object to be measured. The transmission component 5 is provided with a plurality of light-transmitting holes 6 along the circumferential direction. The transmission component 5 is provided with a hollow part 9. The light source 1 is located in the hollow part 9 and at the center of the transmission component 5. The position is fixed and unchanged. The light beam 2 emitted by the light source 1 is transmitted out through the light-transmitting holes 6.

[0048] Among them, the refractor 10 and the refractor 2 11 are used to receive the light beam 2 emitted from different light transmission holes 6 respectively, so as to refract the light beam; the photodetector 1 receives the light beam refracted by the refractor 1 and displays its incident position; the photodetector 2 receives the light beam refracted by the refractor 2 and displays its incident position. In the measurement process, at least one of the photodetector 1 7 and the photodetector 2 8 can receive the light beam 2 to achieve continuous measurement.

[0049] The processing system processes the incident position change value of the light beam 2 received by the photodetector 1 7 and / or the photodetector 2 8 to obtain the rotation angle value of the object being measured. The processing system can be any module, chip or device with mathematical computing capability, such as a single chip microcomputer, FPGA, or computer.

[0050] It is easy to understand that when the angle between the incident light and the receiving surface of the photodetector is too small, the center of gravity of the light spot of the incident light will shift, affecting the measurement accuracy of the photodetector. By setting the refractor, the angle sensor magnification is increased while reducing the angle of the light beam incident on the photodetector, which not only improves the PSD measurement stability, but also further improves the angle measurement accuracy of the sensor according to the trigonometric relationship. And in this solution, in order to avoid the light beam refracted by the refractor to affect the measurement accuracy, the refractor is fitted to the photodetector.

[0051] In this embodiment, the incident end face of the refractor one forms an angle less than 45° with the light beam incident to the refractor one, and the incident end face of the refractor two forms an angle less than 45° with the light beam incident to the refractor two.

[0052] As a preferred embodiment, the light beam 2 is P polarized light. By using polarized light, the intensity of the light beam incident on the photodetector after refraction is increased, the reflectivity of the light beam when it is incident on the refractor at a large incident angle is reduced, and the proportion of the incident light reflected by the refractor is reduced. In other words, the system's requirements for the incident intensity of the light beam can be reduced.

[0053] like Figure 3 As shown, in this embodiment, the transmission component 5 includes an integrally formed transmission portion 51 and a positioning portion 52, and both the transmission portion 51 and the positioning portion 52 are regular polygonal columns. Figure 3 As shown, the shape of the positioning portion 52 is the same as that of the transmission portion 51. The hollow portion 9 is provided in the transmission portion 51, and is formed by a cylindrical through hole provided along the axial direction of the transmission portion 51. A plurality of light-transmitting holes 6 are distributed along the circumference of the transmission portion 51, and penetrate the entire wall thickness of the transmission portion 51, so as to allow the light beam 2 emitted by the light source 1 to pass through and be incident on the refractor 1 10 and / or the refractor 2 11. The positioning portion 52 is provided with a mounting hole, and the object to be measured is connected to the positioning portion 52 through the mounting hole. The transmission portion 51 and / or the positioning portion 52 may also be a cylinder, or other structures. The purpose of using a polygonal column is to facilitate the clamping of the positioning portion 52, so as to facilitate installation and positioning.

[0054] like Figure 2 As shown, the solid line represents the beam 2 before rotation, and the dotted line represents the rotation For the light beam 2 after the angle rotation, during the measurement process of the light beam 2 being transmitted from the light-transmitting hole 6 to the same refractor and then refracted to be incident on the same photodetector, the incident point of the light beam 2 on the photodetector before rotation is defined as incident point one, and the incident point of the light beam 2 on the photodetector after rotation is defined as incident point two. The angle of rotation can be calculated by the incident position change value measured on the photodetector one 7 or the photodetector two 8 (that is, the distance between the incident point one and the incident point two). In order to minimize the measurement error introduced into the system by the refractor, the thickness of the refractor is controlled within 1% from the light source 1 (point) to the incident point of the refractor. The following calculation process ignores the error introduced into the system by the refractor. For the convenience of description, the projection of the light source 1 (point) to the photodetector (straight line) is defined as the projection point, and the straight line where the distance between the light source 1 and the photodetector is located is the distance line. Specifically, there is s=s1±s2, where L is the distance between the light source 1 and the photodetector, s is the displacement change value measured by the photodetector (one or two), s1 is the distance between the incident point one and the projection point, s2 is the distance between the incident point two and the projection point, α is the angle between the light beam 2 and the distance line before rotation, and β is the angle between the light beam 2 and the distance line after rotation.

[0055] In order to ensure that the light beam 2 emitted by the light source 1 can be received by the photodetector 1 7 and / or the photodetector 2 8 after being transmitted through the light-transmitting hole 6 and refracted by the refractor 1 and / or the refractor 2 to achieve continuous measurement, two critical points can be set for the photodetector 1 7 and the photodetector 2 8 respectively, and the range of the rotation angle of each light-transmitting hole 6 of the transmission component 5 corresponding to the two critical points is the detection maximum value and the detection minimum value of the photodetector respectively. After the light beam 2 emitted by the light source 1 is emitted through the light-transmitting hole 6, at least one photodetector can receive the light beam refracted by the corresponding refractor, that is, the light beam 2 is located in the detection area between the two critical points in the photodetector; the method for the processing system to switch detection calculation between the photodetector 1 7 and the photodetector 2 8 is that when one of the photodetector 1 7 and the photodetector 2 8 detects that the transmitted light beam 2 exceeds the area between the two critical points in the photodetector, the processing system automatically switches to using the detection value of the light beam 2 in the detection area of ​​the other photodetector for calculation.

[0056] It is easy to understand that in order to avoid interference, the photodetector 1 7 (or the photodetector 2 8) can only receive the light beam 2 emitted from one light-transmitting hole 6 at the same time. For example, the projection point of the light source 1 on the photodetector is the midpoint of the photodetector. Figure 4 As shown, assuming that the length of the photodetector is H, the angle of the straight line light beam emitted by the light source 1 is θ, and the distance between the light source 1 and the photodetector is L, the distribution angle range β of the light-transmitting hole 6 must meet the following conditions:

[0057] in

[0058] In order to ensure that there is always one photodetector between the photodetector 1 7 and the photodetector 2 8 that can receive the light beam 2, Figure 4 As shown, as an implementation, the positions of the photodetector 1 7 and the photodetector 2 8 can be set to satisfy the following relationship: the angle of the straight line light beam emitted by the light source 1 is greater than the receiving angle δ of the photodetector 1 7 and the photodetector 2 8. When the rotation angle of the object to be measured is very small, the light beam 2 before and after the rotation may be emitted from the same light-transmitting hole 6 to the photodetector, and when the rotation angle is large, the light beam 2 before and after the rotation is emitted from different light-transmitting holes 6 to the same photodetector.

[0059] To perform measurements using the above-mentioned refractor-based angle measurement sensor, follow these steps:

[0060] Connecting the transmission component to the object to be measured so that the transmission component can rotate with the rotation of the object to be measured;

[0061] Adjust the positional relationship between the light beam, the transmission component, the first refractor, the second refractor, the first photodetector, and the second photodetector, so that at least one of the first photodetector and the second photodetector can receive the light beam transmitted from one of the light transmission holes and refracted by the first refractor and / or the second refractor;

[0062] The light beam is emitted, and the light beam is transmitted through one or more light-transmitting holes of the transmission component. The first refractor and / or the second refractor receive the light beam emitted from the light-transmitting hole and refract the light beam. The first photodetector and / or the second photodetector detect the initial incident position of the light beam emitted from one of the light-transmitting holes after being refracted by the corresponding refractor.

[0063] The object to be measured rotates, and during the rotation process, the photodetector 1 and / or the photodetector 2 detects the change of the incident position of the light beam emitted from one of the light transmission holes on the respective detectors after being refracted by the refractor 1 and / or the refractor 2, until the object to be measured stops rotating;

[0064] The processing system obtains the rotation angle value of the object under test by processing the incident position change value of the light beam 1 received on the photoelectric detector 1 and / or the incident position change value of the light beam 2 received on the photoelectric detector 2.

[0065] Example 2

[0066] like Figure 3 As shown, Figure 3 Only the transmission process of laser beam 1 is shown in this embodiment.

[0067] An angle measurement sensor based on a refractor includes a laser beam 1 3, a laser beam 2 4, and the following components:

[0068] A reflective component 16, used to fix the object to be measured, the reflective component 16 is rotatable and has a plurality of reflective surfaces 14 arranged along the circumference, each of the reflective surfaces 14 being used to reflect the laser beam 1 3 and the laser beam 2 4;

[0069] A refractor 10, for receiving the laser beam 3 after being reflected by the reflective surface in the reflective component and refracting the laser beam;

[0070] A second refractor 11, used for receiving the laser beam reflected by the second laser beam 4 on the reflective surface of the reflective component and refracting the laser beam;

[0071] A photoelectric detector 7 is used to receive the light beam refracted by a refractor 10 and display its incident position;

[0072] The photoelectric detector 8 is used to receive the light beam refracted by the refractor 11 and display its incident position;

[0073] The processing system obtains the rotation angle value of the object to be measured on the reflective component according to the incident position change value of the laser beam 1 received on the photoelectric detector 1 and / or the incident position change value of the laser beam 2 received on the photoelectric detector 2.

[0074] It is easy to understand that when the angle between the incident light and the receiving surface of the photodetector is too small, the center of gravity of the light spot of the incident light will shift, affecting the measurement accuracy of the photodetector. By setting the refractor, the angle of the light beam incident on the photodetector is reduced while increasing the magnification of the angle sensor, and the laser with a large incident angle is refracted and incident on the PSD at a small angle, which not only improves the PSD measurement stability, but also further improves the angle measurement accuracy of the sensor according to the trigonometric relationship. And in this solution, in order to avoid the light beam refracted by the refractor to affect the measurement accuracy, the refractor is fitted with the photodetector.

[0075] As a preferred embodiment, the incident angle of the laser beam 1 3 incident on the refraction mirror 10 is greater than 45°, and the incident angle of the laser beam 2 4 incident on the refraction mirror 2 11 is greater than 45°.

[0076] In a further solution, the light beam 2 is P polarized light. By using polarized light, the intensity of the light beam incident on the photodetector after refraction is increased, the reflectivity of the light beam when it is incident on the refractor at a large incident angle is reduced, and the proportion of the incident light reflected by the refractor is reduced. In other words, the system's requirements for the incident intensity of the light beam can be reduced.

[0077] When using the above-mentioned refractor-based angle measurement sensor for measurement, the following steps are included:

[0078] Fixing the reflective component on the object to be measured;

[0079] Adjust the positional relationship between the laser beam 1, the laser beam 2, the reflective component, the refractor 1, the refractor 2, the photodetector 1, and the photodetector 2, so that the laser beam 1 is reflected by the reflective surface in the reflective component and is incident on the refractor 1, the photodetector 1 can receive the laser beam 1 refracted by the refractor 1, the laser beam 2 is reflected by the reflective surface in the reflective component and is incident on the refractor 2, and the photodetector 2 can receive the laser beam 2 refracted by the refractor 2;

[0080] Emittering a first laser beam and a second laser beam, wherein the first laser beam and the second laser beam are respectively reflected by different reflection surfaces of the reflection component and refracted by different refraction mirrors, and the first photodetector and the second photodetector detect the initial positions of the reflected light beams;

[0081] The object to be measured rotates, and during the rotation process, the photodetector 1 and the photodetector 2 respectively detect the changes in the incident positions of the reflected laser beams of the laser beam 1 and the laser beam 2 on the respective detectors until the rotation of the object to be measured stops;

[0082] The processing system obtains the rotation angle value of the object to be measured on the reflective component through the incident position change value of the laser beam 1 received on the photoelectric detector 1 and / or the incident position change value of the laser beam 2 received on the photoelectric detector 2.

[0083] Example 3

[0084] like Figure 6 As shown, Figure 6 Only the transmission process of laser beam 1 is shown to illustrate its principle. This embodiment provides an angle measurement sensor based on a refractor, including laser beam 1 3, laser beam 2 4, and the following components:

[0085] A reflective component 16, used to fix the object to be measured, the reflective component 16 is rotatable and has a plurality of reflective surfaces 14 arranged along the circumference, each of the reflective surfaces 14 being used to reflect the laser beam 1 3 and the laser beam 2 4;

[0086] Photodetector 1 7, photodetector 2 8, at least one reflector 1 15, at least one reflector 2 (not shown in the figure), refractor 1 10, refractor 2 (not shown in the figure);

[0087] The reflector 15 is arranged between the photodetector 7 and the reflective component 16. The laser beam 3 is reflected by a reflective surface 14 in the reflective component 16 and then enters the reflector 15. The refractor 10 receives the laser beam reflected by the reflector 15 and refracts the laser beam. The photodetector 7 receives the laser beam refracted by the refractor 10 and displays its incident position.

[0088] The second reflector is arranged between the second refractor and the reflective component 16. The second laser beam is incident on the second reflector after being reflected by the reflective surface in the reflective component. The second refractor receives the laser beam reflected by the second reflector and refracts the laser beam. The second photodetector receives the laser beam refracted by the second refractor and displays its incident position.

[0089] The processing system obtains the rotation angle value of the object to be measured on the reflecting component 16 according to the incident position change value of the laser beam 13 received on the photoelectric detector 17 and / or the incident position change value of the laser beam 24 received on the photoelectric detector 28.

[0090] like Figure 6As shown, once the laser beam is reflected by the reflector, the length of the optical arm can be increased, thereby improving the angle measurement accuracy of the angle sensor.

[0091] It is easy to understand that the larger the incident angle of the PSD (photodetector), the greater the degree of ellipticalization of the incident light spot, and the longer the major axis in the PSD displacement measurement direction, which has an adverse effect on the PSD position measurement accuracy. By setting the refractor 10 and the refractor 2, the angle sensor magnification is increased while reducing the angle of the light beam incident on the photodetector, thereby improving the angle measurement accuracy of the angle sensor. And in this solution, in order to avoid the light beam refracted by the refractor to affect the measurement accuracy again, the refractor is fitted with the photodetector.

[0092] As a preferred implementation, the incident end face of refractor one forms an angle less than 45° with laser beam one incident to refractor one, and the incident end face of refractor two forms an angle less than 45° with laser beam two incident to refractor two.

[0093] In a further solution, the laser beam 1 3 and the laser beam 2 4 are both P polarized light. By using polarized light, the intensity of the light beam incident on the photodetector after refraction is increased, the reflectivity of the light beam when it is incident on the refractor at a large incident angle is reduced, and the proportion of the incident light reflected by the refractor is reduced. In other words, the system's requirements for the incident intensity of the light beam can be reduced.

[0094] exist Figure 6 In the structure shown, there are two reflectors 15. After the laser beam 3 is reflected by the reflective surface 14 in the reflective component 16, it is incident on one of the reflectors 15, and after being reflected by the reflector 15, it is incident on the other reflector 15. The photoelectric detector 7 receives the laser beam reflected by the other reflector 15 and refracted by the corresponding refractor and displays its incident position. After multiple reflections, the laser beam 3 can increase the length of the optical arm and further improve the measurement accuracy.

[0095] Of course, there can also be two reflectors. After the laser beam 2 is reflected by the reflective surface in the reflective component, it is incident on one of the reflectors 2, and after being reflected by the reflector 2, it is incident on the other reflector 2. The photodetector 2 receives the laser beam reflected by the other reflector 2 and refracted by the corresponding refractor and displays its incident position.

[0096] like Figure 7As shown, laser beam 1 and laser beam 2 are obtained from a light source 1. Specifically, a beam splitter 12 is provided between the light source 1 and the regular polygonal column. The light beam 2 emitted by the light source 1 reaches the beam splitter 12 and is divided into laser beam 13 and laser beam 24 after transmission and reflection. Laser beam 13 is incident on refractor 10 after being reflected by the regular polygonal column, and is incident on photodetector 17 after being refracted. Laser beam 24 is incident on at least one reflector 13 and then reflected on reflection surface 14. It is incident on refractor 2 11 after being reflected by the reflection surface 14, and is incident on photodetector 2 8 after being refracted. In this way, the cost of the laser source can be reduced.

[0097] Both the photodetector 1 7 and the photodetector 2 8 are provided with two critical points for switching detection of the two photodetectors, the range of the rotation angle of each reflecting surface 14 of the reflecting component 16 corresponding to the two critical points are the detection maximum and detection minimum of the photodetector respectively, and at least one of the two laser beams reflected by the two different reflecting surfaces of the reflecting component is located in the detection area between the two critical points in the photodetector; the method for the processing system to perform switching detection calculation between the photodetector 1 7 and the photodetector 2 8 is that when one of the photodetector 1 7 and the photodetector 2 8 detects that the reflected laser beam exceeds the area between the two critical points in the photodetector, the processing system automatically switches to using the laser beam detection value in the detection area of ​​the other photodetector for calculation.

[0098] In another scheme, Figure 6 As shown, the two reflectors 15 are arranged parallel to each other. Similarly, the two reflectors 2 can also be arranged parallel to each other to facilitate structural arrangement.

[0099] When using the above-mentioned refractor-based angle measurement sensor for measurement, the following steps are included:

[0100] Fixing the reflective component on the object to be measured;

[0101] Adjust the positional relationship between the laser beam 1, the laser beam 2, the reflective component, the refractor 1, the refractor 2, the photodetector 1, the photodetector 2, the reflector 1 and the reflector 2, so that the laser beam 1 is reflected by the reflective surface in the reflective component and is incident on the reflector 1, and the refractor 1 can receive the laser beam reflected by the reflector 1 and refract the laser beam and enter the photodetector 1, and the laser beam 2 is reflected by the reflective surface in the reflective component and is incident on the reflector 2, and the refractor 2 can receive the laser beam reflected by the reflector 2 and refract the laser beam and enter the photodetector 2;

[0102] Emittering a laser beam 1 and a laser beam 2, wherein the laser beam 1 and the laser beam 2 are respectively reflected by different reflection surfaces of the reflection component and incident on the corresponding reflection mirror 1 and the reflection mirror 2, and then reflected by the reflection mirror 1 and the reflection mirror 2, and incident on the corresponding refractor 1 and the refractor 2, respectively, and the photoelectric detector 1 and the photoelectric detector 2 detect the initial position of the laser beam after being refracted by the corresponding refractor 1 and the refractor 2;

[0103] The object to be measured rotates, and during the rotation process, the photodetector 1 and the photodetector 2 respectively detect the changes in the incident positions of the reflected laser beams of the laser beam 1 and the laser beam 2 on the respective detectors until the rotation of the object to be measured stops;

[0104] The processing system obtains the rotation angle value of the object to be measured on the reflective component through the incident position change value of the laser beam 1 received on the photoelectric detector 1 and / or the incident position change value of the laser beam 2 received on the photoelectric detector 2.

[0105] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0106] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An angle measurement sensor based on a refractor, It is characterized in that It includes: a light source for emitting a light beam; A transmission component, the transmission component is used to connect with the object to be measured, the transmission component is rotatable and has a plurality of light-transmitting holes along the circumferential direction, the transmission component is provided with a hollow part, the light source is located in the hollow part and at the center of the transmission component, and the position is fixed, and the light beam emitted by the light source is transmitted out through the light-transmitting hole; a refractor one is used to receive the light beam emitted from the light-transmitting hole and refract the light beam; a refractor two is used to receive the light beam emitted from the light-transmitting hole and refract the light beam; a photodetector one is used to receive the light beam refracted by the refractor one and display its incident position; a photodetector two is used to receive the light beam refracted by the refractor two and display its incident position, and during the measurement process, at least one of the photodetector one and the photodetector two can receive the light beam; a processing system is specifically used to process and obtain the rotation angle value of the object to be measured according to the incident position change value of the light beam received on the photodetector one and / or the photodetector two; The first refractor is fitted with the first photodetector; the second refractor is fitted with the second photodetector; The incident surface and the exit surface of the first refractor and the second refractor are both planes, and the incident surface and the exit surface are parallel to each other.

2. The angle measurement sensor based on a refractor according to claim 1, It is characterized in that The light beam is P polarized light.

3. The angle measurement sensor based on a refractor according to claim 1, It is characterized in that The incident end face of the first refractor forms an angle less than 45° with the light beam incident to the first refractor, and the incident end face of the second refractor forms an angle less than 45° with the light beam incident to the second refractor.

4. An angle measurement sensor based on a refractor, It is characterized in that include: Laser beam 1 and laser beam 2; a reflective component, the reflective component is used to fix the object to be measured, the reflective component is rotatable and has a plurality of reflective surfaces along the circumference, each of the reflective surfaces is used to reflect the laser beam 1 and the laser beam 2; a refractor 1 is used to receive the laser beam of the laser beam 1 after being reflected by the reflective surface in the reflective component and refract the laser beam; a refractor 2 is used to receive the laser beam of the laser beam 2 after being reflected by the reflective surface in the reflective component and refract the laser beam; a photodetector 1 is used to receive the light beam refracted by the refractor 1 and display its incident position; Photoelectric detector 2, used to receive the light beam refracted by refractor 2 and display its incident position; processing system, based on the incident position change value of laser beam 1 received by photoelectric detector 1 and / or the incident position change value of laser beam 2 received by photoelectric detector 2, to obtain the rotation angle value of the object to be measured on the reflective component; The first refractor is fitted with the first photodetector; the second refractor is fitted with the second photodetector; The incident surface and the exit surface of the first refractor and the second refractor are both planes, and the incident surface and the exit surface are parallel to each other.

5. The angle measurement sensor based on a refractor according to claim 4, It is characterized in that It also includes at least one reflecting mirror 1 and at least one reflecting mirror 2; the reflecting mirror 1 is arranged between the refracting mirror 1 and the reflecting component, the laser beam 1 is reflected by the reflecting surface in the reflecting component and then enters the reflecting mirror 1, the refracting mirror 1 receives the laser beam reflected by the reflecting mirror 1 and refracts the laser beam, the photodetector 1 receives the laser beam refracted by the refracting mirror 1 and displays its incident position; the reflecting mirror 2 is arranged between the refracting mirror 2 and the reflecting component, the laser beam 2 is reflected by the reflecting surface in the reflecting component and then enters the reflecting mirror 2, the refracting mirror 2 receives the laser beam reflected by the reflecting mirror 2 and refracts the laser beam, the photodetector 2 receives the laser beam refracted by the refracting mirror 2 and displays its incident position.

6. The angle measurement sensor based on a refractor according to claim 5, It is characterized in that It also includes a light source, a spectroscope and at least one reflector. The light beam emitted by the light source is incident on the spectroscope and is reflected and transmitted to obtain the laser beam 1 and the laser beam 2 respectively. The laser beam 1 and the laser beam 2 are respectively reflected by two different reflecting surfaces of the reflecting component and refracted by two different refraction mirrors to be received by the corresponding photodetector 1 and photodetector 2.

7. The angle measurement sensor based on a refractor according to any one of claims 5 to 6, It is characterized in that The incident end face of the first refractor forms an angle less than 45° with the first laser beam incident on the first refractor, and the incident end face of the second refractor forms an angle less than 45° with the second laser beam incident on the second refractor.

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