WO2019119993A1

WO2019119993A1 - Novel optical communication system and method applicable to rotary joint

Info

Publication number: WO2019119993A1
Application number: PCT/CN2018/113736
Authority: WO
Inventors: 李立; 郭海超
Original assignee: 西安空间无线电技术研究所
Priority date: 2017-12-22
Filing date: 2018-11-02
Publication date: 2019-06-27
Also published as: GB2575761B; CN108270486A; CN108270486B; GB201916184D0; GB2575761A

Abstract

Disclosed are a novel optical communication system and method applicable to a rotary joint. The system comprises: a light source, an optical expanded beam lens group, a wavelength spectroscope, a focus lens group, a receiving detector, a receiving unit, a transmission unit, and a conical cavity. A light source transmitted by the light source is collimated into a beam by means of the optical expanded beam lens group; the collimated beam is transmitted by means of the wavelength spectroscope having receipt/transmission separated; the transmitted beam is reflected into a circular beam by means of the surface of the conical cavity; the receiving unit receives the circular beam; a collimated light transmitted by the transmission unit is irradiated to the surface of the conical cavity, is reflected to the wavelength spectroscope by means of the conical cavity, then is reflected onto the focus lens group by means of the wavelength spectroscope; a beam converged by means of the focus lens group is transmitted to the receiving detector. According to the present invention, the bidirectional communication between a transmitted light ring and the optical receipt is performed without being affected by a rotary mechanism. Information interaction can be made for two servomechanisms of an inner stator and an outer stator or a rotary joint.

Description

Novel optical communication system and method suitable for rotary joint

The present application claims priority to Chinese Patent Application No. 201711408600.1, entitled "A New Type of Optical Communication System and Method for Rotating Joints", filed on December 22, 2017, the entire contents of which is hereby incorporated by reference. The citations are incorporated herein by reference.

Technical field

The invention belongs to the field of communications, and in particular relates to a novel optical communication system and method suitable for a rotary joint.

Background technique

Communication between rotating joints is often achieved using slip rings. The electrical connection between the rotating end and the fixed end, such as power supply and signal, is transmitted through the conductive slip ring, but the long-term friction between the conductive slip ring contact and the ring body will result in performance degradation, low reliability, poor anti-electromagnetic interference capability, and high speed. The digital signal has a large transmission attenuation and unreliable communication.

The optical fiber slip ring is a traditional mechanical power ring with a fiber optic rotary connector and a flexible connection through a mechanical plug-in mechanism. The fiber optic rotary connector uses a single-mode fiber collimator, a miniature precision shaft system, mechanical connection and adjustment. Institutional composition. Fiber slip rings have unique advantages. (1) Transmission of signals by optical fiber, no leakage, no electromagnetic interference, can be transmitted over long distances; (2) less dust generation, long life, up to 100 million rpm; (3) small size, light weight, stainless steel material; (4) Low loss (<1.0 dB) and high rotation rate (1000 rpm). Such a fiber slip ring can only be one-dimensional optical communication, and two-dimensional optical communication requires two such fiber slip rings and is constrained in the specific use of the rotating components.

In free-space optical communication or laser ranging, Kurdish optics is often used to transmit optical information from the servo. The Kurd light path structure is shown in Figure 1. The receiving antenna output beam is directed to the Coud mirror 200 along the vertical axis rotation axis after the Codd mirror 100, and then directed to the Coud mirror along the pitch axis rotation axis via the Coud mirror 300. 400, then reflected by the Coud mirror 400, and finally emitted by the beam expanding system. This Kurd light path is actually a combination of two sets of periscope, which is also more complicated to install.

In the prior art, there is no method for optical two-way communication of a highly universal rotary joint.

Summary of the invention

The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a novel optical communication system and method suitable for a rotary joint, which adopts an optical circular beam beam method to realize two-way communication between the transmitting optical ring and the optical receiving, and Without the influence of the rotating mechanism, the two servo mechanisms or the rotating joints of the inner stator and the outer stator can realize the information interaction, and the interaction of the information of the inner stator can be compensated compared with the existing optical communication slip ring.

The object of the present invention is achieved by the following technical solution: According to an aspect of the present invention, a novel optical communication system suitable for a rotary joint is provided, comprising: a light source, an optical beam expander lens group, a wavelength beam splitter, a focus lens group, and a receiving a detector, a receiving unit, a transmitting unit and a conical cavity; wherein the light source emitted by the light source passes through the collimated beam of the optical beam expanding lens group, and the collimated beam is transmitted through the wavelength splitting mirror separated and transmitted; the transmitted beam is reflected by the surface of the conical cavity The circular beam is received by the receiving unit, and the receiving unit receives the circular beam; the collimated light emitted by the emitting unit is irradiated onto the surface of the conical cavity, reflected by the surface of the conical cavity to the wavelength beam splitter, and then reflected by the wavelength beam splitter to the focusing lens group, through the focusing lens The concentrated beams of the group are transmitted to the receiving detector.

In the above novel optical communication system suitable for a rotary joint, the light source is a visible light diode for emitting a point light source, and the light source has a divergence angle of 30°-120° and a wavelength of 430 nm±20 nm.

In the above novel optical communication system suitable for a rotary joint, the transmitting unit includes an emitting light source and a collimating system; wherein the light source emitted by the emitting light source is converted into collimated light by the collimating system.

In the above novel optical communication system suitable for a rotary joint, the emission light source is a visible light diode for emitting a point light source, and the light source has a divergence angle of 30°-120° and a wavelength of 630 nm±20 nm.

The above-mentioned novel optical communication system suitable for a rotary joint further includes: a rotary joint; wherein the light source, the optical beam expander lens group, the conical cavity, the wavelength beam splitter, and the focus lens group are all disposed inside the rotary joint; the emission unit is disposed on the rotation One side inner wall of the joint, the receiving unit and the receiving detector are both disposed on the other inner wall of the rotating joint.

In the above novel optical communication system suitable for a rotary joint, the optical expander lens group has a focal length of 17 mm to 60 mm, and the collimated beam has a diameter of 10 mm to 50 mm.

In the above novel optical communication system suitable for a rotary joint, the wavelength beam splitter is capable of transmitting blue light having a wavelength of 430 nm ± 20 nm and reflecting red light having a wavelength of 630 nm ± 20 nm.

In the above novel optical communication system suitable for a rotary joint, the cone angle of the conical cavity is 5°-150°.

In the above novel optical communication system suitable for a rotary joint, the receiving unit is a photodetector.

According to another aspect of the present invention, there is also provided a novel optical communication method suitable for a rotary joint, the method comprising the steps of: a light source emitted by a light source passes through a collimated beam of an optical beam expander lens group, and the collimated beam passes through The transmitting and receiving separated wavelength beam splitter transmits out; the transmitted beam is reflected by the surface of the conical cavity into a circular beam, and the receiving unit receives the circular beam; the collimated light emitted by the emitting unit is irradiated onto the surface of the conical cavity, and is reflected by the surface of the conical cavity to the wavelength beam splitter And then reflected by the wavelength splitting mirror onto the focusing lens group, and the beam concentrated by the focusing lens group is transmitted to the receiving detector.

Compared with the prior art, the invention has the following beneficial effects:

(1) The present invention uses only one light source to achieve 360° circumferential communication beam coverage of the light beam, minimizing the number of optical emitters;

(2) The single light source used in the invention has simple design in space and optical path, and is suitable for the narrow space of the servo mechanism;

(3) The invention adopts a conical cavity to shape the light beam to form a circular beam, and the conical cavity is placed in the inner core of the servo mechanism, and the receiving portion is on the rotating joint of the servo mechanism, and the ring of the optical communication is adapted. The mechanism of the inner core of the stator also adapts to the mechanism form of the outer core of the stator, and has a universal demand.

DRAWINGS

Various other advantages and benefits will become apparent to those skilled in the art from a The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting. Throughout the drawings, the same reference numerals are used to refer to the same parts. In the drawing:

1 is a schematic structural view of a Kurd light path in the prior art;

2 is a schematic structural view of a novel optical communication system suitable for a rotary joint according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the embodiments of the present invention have been shown in the drawings, the embodiments Rather, these embodiments are provided so that this disclosure will be more fully understood and the scope of the disclosure will be fully disclosed. It should be noted that the embodiments in the present invention and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments.

2 is a schematic structural view of a novel optical communication system suitable for a rotary joint according to an embodiment of the present invention. As shown in FIG. 2, the novel optical communication system suitable for a rotary joint includes: a light source 1, an optical beam expanding lens group 2, a wavelength beam splitter 3, a focusing lens group 4, a receiving detector 5, a receiving unit 6, and a transmitting unit 7. And the conical cavity 8. among them,

The light source emitted by the light source 1 passes through the collimated beam of the optical beam expanding lens group 2, and the collimated beam is transmitted through the wavelength splitting mirror 3 that is transmitted and received separated; the transmitted beam is reflected by the surface of the conical cavity 8 into a circular beam, the circular beam and the incident The light beam to the surface of the conical cavity 8 is at 90 degrees, and the receiving unit 6 receives the circular beam;

The collimated light emitted from the emitting unit 7 is irradiated onto the surface of the conical cavity 8, reflected by the surface of the conical cavity 8 to the wavelength dichroic mirror 3, and then reflected by the wavelength dichroic mirror 3 onto the focusing lens group 4, and the beam is concentrated by the focusing lens group 4. To the receiving detector 5.

In the above embodiment, the light source 1 is a visible light diode for emitting a point light source, and the light source has a divergence angle of 30°-120° and a wavelength of 430 nm±20 nm. Preferably, the light source beam divergence angle is 120 degrees.

In the above embodiment, the transmitting unit 7 includes an emitting light source and a collimating system; wherein the light source emitted by the emitting light source is converted into collimated light by the collimating system. In a specific implementation, the light source is a visible light diode for emitting a point light source, and the light source has a divergence angle of 30°-120° and a wavelength of 630 nm±20 nm. Preferably, the light source beam divergence angle is 120 degrees.

As shown in FIG. 2, a novel optical communication system suitable for a rotary joint also includes a rotary joint 9. among them,

The light source 1, the beam expander lens 2, the conical cavity 8, the wavelength beam splitter 3, the beam expander lens group 2, and the focus lens group 4 are all disposed inside the rotary joint 9; the emission unit 7 is disposed on one side inner wall of the rotary joint 9 to receive Both the unit 6 and the receiving detector 5 are disposed on the other side inner wall of the rotary joint 9.

Specifically, the present embodiment proposes a novel optical communication method suitable for a rotary joint, which uses only one laser emitter to achieve 360° circumferential communication beam coverage of the light beam, and minimizes the number of light source emitters, and proposes to adopt cone light. The channel shapes the beam to form a circular ring of the beam, placing the conical cavity in the inner core of the servo mechanism, and the receiving portion forms an uplink on the rotor arm of the servo mechanism. The receiving device has only one detector, on the axis. When rotated up, the information can be received in a 360-degree rotation. In addition, in the downlink, the transmitting device is mounted on the rotor arm, and the emitted light beam is irradiated onto the surface of the conical cavity. No matter how the relative rotation of the conical cavity and the transmitting device rotates, the emission of the information beam is not affected, and the spectroscope is not affected. The latter information is received. The specific implementation steps are as follows:

The light source adopts the point source of LED, the light source divergence angle is 120 degrees, the wavelength of the LED light source is blue light 430nm±20nm, and the light beam passes through the beam expander lens group, as shown in Fig. 2, the beam is expanded into approximately parallel light, and the diameter of the parallel beam is 30mm, so The focal length of the lens group is 30mm/tan 60°, that is, 17mm, and the approximately parallel beam passes through the wavelength beam splitter. The beam splitter is red light that can transmit blue light of 430nm±20nm and reflection wavelength of 630nm±20nm. The beam is then subjected to a cone reflection with a full cone angle of 90 degrees. The surface of the cone is machined to a roughness of 0.8, hard aluminum 7050, and the surface is chrome-plated with high reflection. The reflected beam is reflected by the cone into a ring-shaped light with a beam diameter of 25 mm. The incident light of the cone is at an angle of 90 degrees with the reflected light, and the receiving unit mounted on the inner wall of the rotating joint receives the optical signal, which is an uplink.

In addition, the emission source of the emission unit mounted on the hollow core wall adopts the point source of the LED, the divergence angle of the light source beam is 120 degrees, the wavelength of the LED light source is red light 630 nm±20 nm, and the beam is collimated by the collimating lens group, and the collimated beam diameter is collimated. 30mm, so the focal length of the lens group is 30mm/tan 60°, which is 17mm, as shown in Figure 2. As the motor rotates 360 degrees, the beam can always be illuminated to the surface of the cone. Since the full cone angle of the cone is 90 degrees, the reflected light can be transmitted in the opposite direction of the uplink, transmitted to the wavelength beam splitter, and then wavelength-divided. The mirror is reflected to the focusing lens group and focused on the photodetector. The filter contained in the focusing lens group is used to filter out stray light with a filter wavelength of 630 nm ± 20 nm.

The transmitting unit and the receiving unit are always mounted on the rotating movable joint. For the case where the stator core is present in the servo mechanism, this situation needs to be opened at equal distances on the core arm of the stator to ensure that the receiving beam is not affected by the stator fixed core. Or ensure that the emitted beam is not affected by the fixed core. The open-ended stator core is fixed and there are no special requirements for the opening. Mounted on the rotating joint, the receiving unit can ensure the upward reception of the beam with 360 degree rotation. Similarly, the transmitting unit mounted on the rotating cylinder wall can also emit the downward beam with 360 degree rotation.

The present embodiment also provides a novel optical communication method suitable for a rotary joint. Referring to FIG. 2, the method includes the following steps:

In this embodiment, only one light source is used to realize 360° circumferential communication beam coverage of the light beam, and the number of optical emitters is minimized; and the single light source used in this embodiment has simple design in space and optical path, and is adapted to the narrow space of the servo mechanism. Needed; and this embodiment uses a conical cavity to shape the beam to form a circular beam, which is placed in the inner core of the servo mechanism, and the receiving portion is on the rotating joint of the servo mechanism. The mechanism adapting to the inner core of the stator also adapts to the mechanism form of the outer core of the stator, and has a universal demand.

The embodiments described above are only preferred embodiments of the present invention, and the usual changes and substitutions made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.

Claims

A novel optical communication system suitable for a rotary joint, comprising: a light source (1), an optical beam expanding lens group (2), a wavelength beam splitter (3), a focusing lens group (4), a receiving detector (5) ), receiving unit (6), transmitting unit (7) and conical cavity (8); wherein

The light source emitted by the light source (1) passes through the optical beam expanding lens group (2) collimated beam, and the collimated beam is transmitted through the wavelength splitting mirror (3) which is transmitted and received separated; the transmitted beam is reflected into the circle through the surface of the conical cavity (8). a ring beam, the receiving unit (6) receives the ring beam;

The collimated light from the emitting unit (7) is irradiated onto the surface of the conical cavity (8), reflected by the surface of the conical cavity (8) to the wavelength beam splitter (3), and then reflected by the wavelength dichroic mirror (3) to the focusing lens group (4) The beam concentrated by the focusing lens group (4) is transmitted to the receiving detector (5).
A novel optical communication system suitable for a rotary joint according to claim 1, wherein the light source (1) is a visible light diode for emitting a point light source, and the light source divergence angle is 30°-120°, and the wavelength is 430 nm ± 20 nm.
A novel optical communication system suitable for a rotary joint according to claim 1, wherein said transmitting unit (7) comprises an emitting light source and a collimating system; wherein the light source emitted by the emitting light source is changed to a quasi-linear system Straight light.
A novel optical communication system suitable for a rotary joint according to claim 3, wherein said emission source is a visible light diode for emitting a point source, and the source beam has a divergence angle of 30°-120° and a wavelength of 630 nm±. 20nm.
A novel optical communication system for a rotary joint according to claim 1, further comprising: a rotary joint (9); wherein

The light source (1), the optical beam expanding lens group (2), the conical cavity (8), the wavelength beam splitter (3), and the focusing lens group (4) are all disposed inside the rotating joint (9);

The transmitting unit (7) is disposed on one side inner wall of the rotating joint (9), and the receiving unit (6) and the receiving detector (5) are both disposed on the other side inner wall of the rotating joint (9).
A novel optical communication system for a rotary joint according to claim 1, wherein the optical beam expanding lens group (2) has a focal length of 17 mm to 60 mm, and the collimated beam has a diameter of 10 mm to 50 mm.
A novel optical communication system for a rotary joint according to claim 1, wherein said wavelength dichroic mirror (3) is capable of transmitting blue light having a wavelength of 430 nm ± 20 nm and reflecting red light having a wavelength of 630 nm ± 20 nm.
A novel optical communication system for a rotary joint according to claim 1, characterized in that the conical cavity (8) has a cone angle of 5 to 150.
A novel optical communication system for a rotary joint according to claim 1, characterized in that the receiving unit (6) is a photodetector.
A novel optical communication method suitable for a rotary joint, characterized in that the method comprises the following steps:

The light source emitted by the light source (1) passes through the optical beam expanding lens group (2) collimated beam, and the collimated beam is transmitted through the wavelength splitting mirror (3) which is transmitted and received separated; the transmitted beam is reflected into the circle through the surface of the conical cavity (8). a ring beam, the receiving unit (6) receives the ring beam;

The collimated light from the emitting unit (7) is irradiated onto the surface of the conical cavity (8), reflected by the surface of the conical cavity (8) to the wavelength beam splitter (3), and then reflected by the wavelength dichroic mirror (3) to the focusing lens group (4) The beam concentrated by the focusing lens group (4) is transmitted to the receiving detector (5).