Laser wireless energy and signal synchronous transmission system for rotary motion mechanism

Abstract

The present invention relates to a laser wireless energy and signal synchronous transmission system, and in particular to a laser wireless energy and signal synchronous transmission system for a rotating motion mechanism, which is used to solve the problem that the existing SLWPIT technology, although it has solved the demand for long-distance transmission to a certain extent, still has many limitations in the application of rotating mechanisms. The laser wireless energy and signal synchronous transmission system for a rotating motion mechanism includes a stator part and a rotor part. The present invention considers the full optical link to realize the laser wireless energy and signal synchronous transmission in a rotating state from the system level, can maintain a stable energy transmission efficiency in a rotating state, has good anti-electromagnetic interference ability, and has strong environmental adaptability.

Description

Technical Field

[0001] The invention relates to a laser wireless energy and signal synchronous transmission system, in particular to a laser wireless energy and signal synchronous transmission system for a rotary motion mechanism. Background Art

[0002] In recent years, the technology of simultaneous laser wireless power and information transmission (SLWPIT) has received extensive attention and application in long-distance energy transmission and information transfer. Laser technology, due to its monochromaticity, strong directionality, high power density and concentrated energy, enables efficient energy transmission in the form of light in space. Through high-frequency modulated laser beams, SLWPIT technology can not only transmit energy, but also synchronously transmit information, becoming a new way to achieve laser wireless energy and information transmission.

[0003] As a mature modern communication technology, optical fiber communication relies on the transmission of light waves in optical fibers to achieve long-distance communication with high bandwidth, low loss and anti-interference. The characteristics of optical fiber communication make it widely used in broadband access, data centers, 5G communications and the Internet of Things, but its energy transmission capacity is limited and it is difficult to meet the demand for long-distance high-power energy transmission.

[0004] Laser energy transmission technology is a new type of energy transmission method. Based on the high energy and high light density characteristics of lasers, laser light energy is efficiently converted into electrical energy through photoelectric conversion equipment (such as photovoltaic cells), thereby providing power for various devices and systems. This technology overcomes the limitations of traditional power transmission and has great application potential, especially in areas with harsh environments or difficult to lay cables, such as the seabed, mountainous areas, low altitudes and space.

[0005] In the research of SLWPIT technology, many patents have proposed specific technical solutions, but these solutions still have some shortcomings in practical applications.

[0006] Chinese patent CN117914016A discloses a photoelectric energy transmission system consisting of a low voltage side, a transmission link and a high voltage side. It combines energy light and signal light for transmission on the low voltage side, and converts energy light into electrical energy on the high voltage side, thus solving the power supply problem of the signal acquisition control system on the high voltage side. This method has broad application prospects for high-voltage power systems and smart grids, but due to the limitations of optical fiber size and photovoltaic cell characteristics, the converted power is low. In addition, the laser coupling loss is large, resulting in low overall energy transmission efficiency.

[0007] Chinese patent CN113965273A discloses a fiber laser energy supply method that uses a wavelength division multiplexer to separate and transmit laser energy and signals, meeting the needs of long-distance energy supply and communication over 5 kilometers. However, due to the complex system structure and the inability to support the coordinated transmission of energy and signals in a rotating state, its application in certain scenarios is limited.

[0008] Chinese patent CN111327361A discloses a dual transmission system of different wavelength laser signals and energy, which uses double-clad optical fiber and different wavelength lasers to achieve simultaneous transmission of signals and energy, effectively reducing crosstalk and achieving energy self-sufficiency at the receiving end. However, this solution cannot support synchronous transmission of signals and energy between rotating mechanisms.

[0009] Chinese patent CN108390472A discloses a synchronous transmission system of energy and signal in wireless power transmission technology, and Chinese patent CN103326477A discloses a non-contact signal and energy coupling transmission device. These two schemes use electromagnetic induction to achieve synchronous transmission of signals and energy, and have the advantages of stable output power, high signal transmission rate, and small system size. However, compared with laser transmission, its signal transmission capacity is small, bandwidth is low, transmission rate is slow, and it is susceptible to electromagnetic interference.

[0010] Chinese patent CN118473444A discloses a parallel energy and signal transmission system, which realizes uplink and downlink signal transmission through orthogonal decoupled antennas, and uses excitation wires to realize high-current and high-frequency AC transmission. Although this system reduces some crosstalk problems, it is difficult to achieve high-power transmission in a small volume environment, and the signal transmission rate and capacity are still low.

[0011] In summary, although the existing SLWPIT technology has solved the needs of long-distance transmission to a certain extent, it still has many limitations in the application of rotating mechanisms, submarine transmission and complex environments, such as complex system structure, limited transmission capacity, low signal transmission rate, susceptibility to electromagnetic interference, etc. These problems have restricted the application and development of SLWPIT technology in a wider range of fields to a certain extent. Summary of the invention

[0012] The purpose of the present invention is to solve the problem that although the existing SLWPIT technology has solved the demand for long-distance transmission to a certain extent, it still has many limitations in the application of rotating mechanisms, and to provide a laser wireless energy and signal synchronous transmission system for rotating motion mechanisms.

[0013] In order to solve the deficiencies of the above-mentioned prior art, the present invention provides the following technical solutions:

[0014] The laser wireless energy and signal synchronous transmission system for a rotary motion mechanism is special in that it comprises a stator part and a rotor part;

[0015] The stator part includes a stator housing, a first collimation unit, a beam expansion system, a homogenization unit, a hollow beam unit, and a signal transmission stator unit which are sequentially arranged in the stator housing along the optical path; the rotor part includes a rotor housing, a signal transmission rotor unit and a photoelectric conversion unit which are sequentially arranged in the rotor housing along the optical path;

[0016] The first collimation unit, beam expansion system, and homogenization unit are used to collimate, expand, and homogenize the input light beam, respectively; the hollow beam unit is used to transform the homogenized light beam into a hollow beam and input it into the photoelectric conversion unit, and the photoelectric conversion unit is used to transform the hollow beam into electrical energy to complete laser energy transmission; the central axis of the hollow beam coincides with the rotation axis of the rotor housing;

[0017] The signal transmission stator unit and the signal transmission rotor unit are both located on the axis where the rotating shaft of the rotor housing is located, and correspond to each other, so as to realize bidirectional transmission of signals.

[0018] Further, the signal transmission stator unit includes a first transparent isolation unit, a first optical fiber, and a second collimation unit arranged in a stator housing, and the second collimation unit is arranged on the first transparent isolation unit; the signal transmission rotor unit includes a second transparent isolation unit, a second optical fiber, and a third collimation unit arranged in a rotor housing, and the third collimation unit is arranged on the second transparent isolation unit; the second collimation unit and the third collimation unit are both located on the axis where the rotation axis of the rotor housing is located;

[0019] The hollow light beam sequentially transmits through the first transparent isolation unit and the second transparent isolation unit to enter the photoelectric conversion unit;

[0020] The first optical fiber is used to output the signal of the external signal source to the second optical fiber through the second collimation unit and the third collimation unit in sequence, and to receive the signal of the external signal source transmitted by the second optical fiber through the third collimation unit and the second collimation unit in sequence.

[0021] Furthermore, the first transparent isolation unit and the second transparent isolation unit are both made of flat glass; the second collimating unit and the third collimating unit are both made of collimating lenses.

[0022] Further, the signal transmission stator unit and the signal transmission rotor unit are respectively the stator end and the rotating end of the multi-channel optical fiber rotary connector;

[0023] Alternatively, the signal transmission stator unit and the signal transmission rotor unit are respectively the stator end and the rotating end of a single-channel optical fiber rotary connector.

[0024] Furthermore, the hollow light beam unit comprises a first conical lens and a second conical lens sequentially arranged along the light path, the diameter of the first conical lens gradually decreases along the light path, and the diameter of the second conical lens gradually increases along the light path.

[0025] Furthermore, the hollow light beam unit adopts one of an annular phase mask plate, a spatial light modulator, and a diffractive optical element.

[0026] Furthermore, the first collimating unit adopts a self-focusing lens array; and the homogenizing unit adopts a microlens array or a spatial light modulator.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The present invention is a laser wireless energy and signal synchronous transmission system for a rotating motion mechanism, including a stator part and a rotor part. The present invention considers the full optical link to realize the laser wireless energy and signal synchronous transmission in a rotating state from the system level, can maintain a stable energy transmission efficiency in a rotating state, has good anti-electromagnetic interference ability, and strong environmental adaptability.

[0029] (2) The present invention adopts a rotationally symmetrical structure with a simple overall structure, which reduces complex components, reduces the weight and volume of the system, and is easy to integrate and apply.

[0030] (3) The transmission process of the present invention does not involve physical processes such as mechanical contact and friction and wear, and has the advantages of high reliability, long life, and easy maintenance, especially in application fields that have strict requirements on weight, stability, and environmental adaptability.

[0031] (4) The present invention adopts a self-focusing lens array as the first collimating unit, and obtains incoherent beam spots of different shapes by arranging the array. The light field control under different shapes of spots is realized by using a homogenization unit (microlens array) and a hollow beam unit (first conical lens and second conical lens), and the light field distribution can be reconstructed according to application requirements.

[0032] (5) The present invention adopts a first collimating unit (self-focusing lens array), a beam expansion system, a homogenizing unit (microlens array) and a hollow beam unit (a first conical lens and a second conical lens) to control the light field, realize beam expansion and hollow homogenized beam, increase the laser spot size, and control the beam into a hollow homogenized beam, thereby reducing the obstruction of the signal transmission channel to the laser energy transmission channel and increasing the energy conversion efficiency. Compared with conventional methods, the present invention has a smaller overall size structure, a higher system transmission efficiency, and a high energy conversion efficiency, and can realize high-power energy transmission, and there will be no interference between the signal transmission channel and the energy transmission channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of an embodiment of the laser wireless energy and signal synchronous transmission system for a rotary motion mechanism of the present invention.

[0034] The following are the descriptions of the reference numerals:

[0035] 100, stator housing, 110, first collimation unit, 120, beam expansion system, 130, homogenization unit, 140, hollow beam unit, 141, first conical lens, 142, second conical lens, 150, signal transmission stator unit, 151, first transparent isolation unit, 152, first optical fiber, 153, second collimation unit;

[0036] 200 , rotor housing, 210 , signal transmission rotor unit, 211 , second transparent isolation unit, 212 , second optical fiber, 213 , third collimation unit, 220 , photoelectric conversion unit. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0038] Reference Figure 1 , a laser wireless energy and signal synchronous transmission system for a rotating motion mechanism, comprising a stator part and a rotor part.

[0039] The stator part includes a stator housing 100, a first collimation unit 110, a beam expansion system 120, a homogenization unit 130, a hollow beam unit 140, and a signal transmission stator unit 150, which are sequentially arranged in the stator housing 100 along the optical path. The rotor part includes a rotor housing 200, a signal transmission rotor unit 210 and a photoelectric conversion unit 220, which are sequentially arranged in the rotor housing 200 along the optical path. The signal transmission stator unit 150 and the signal transmission rotor unit 210 are both located on the axis where the rotation axis of the rotor housing 200 is located, and correspond to each other, so as to realize bidirectional transmission of signals.

[0040] The first collimation unit 110 is used to collimate the input light beam to form an incoherent beam, with the aim of optimizing the collimation of the light beam so that it can be effectively transmitted; the beam expansion system 120 is used to expand the incoherent beam, with the aim of increasing the beam diameter and reducing the central energy density, thereby preventing the high-density beam from damaging subsequent components; the homogenization unit 130 is used to homogenize the expanded light beam to make the energy distribution of the light beam more uniform, which helps to improve the energy conversion efficiency of the photoelectric conversion unit 220.

[0041] The hollow beam unit 140 is used to transform the homogenized light beam into a hollow beam whose central axis coincides with the rotation axis of the rotor housing 200, which helps to reduce the concentration of light energy during the receiving process and improve the utilization efficiency of light energy. The hollow beam unit 140 includes a first conical lens 141 and a second conical lens 142 arranged in sequence along the light path. The diameter of the first conical lens 141 gradually decreases along the light path, and the diameter of the second conical lens 142 gradually increases along the light path. In other embodiments, the hollow beam unit 140 can also use one of an annular phase mask, a spatial light modulator, and a diffractive optical element.

[0042] The signal transmission stator unit 150 includes a first transparent isolation unit 151, a first optical fiber 152, and a second collimation unit 153 disposed in the stator housing 100, and the second collimation unit 153 is disposed on the first transparent isolation unit 151; the signal transmission rotor unit 210 includes a second transparent isolation unit 211, a second optical fiber 212, and a third collimation unit 213 disposed in the rotor housing 200, and the third collimation unit 213 is disposed on the second transparent isolation unit 211. The second collimation unit 153 and the third collimation unit 213 are both located on the axis where the rotation axis of the rotor housing 200 is located.

[0043] The hollow light beam sequentially passes through the first transparent isolation unit 151 and the second transparent isolation unit 211 and enters the photoelectric conversion unit 220 . The photoelectric conversion unit 220 is used to convert the hollow light beam into electrical energy to complete the laser energy transmission.

[0044] In this embodiment, the first collimating unit 110 adopts a self-focusing lens array; the homogenizing unit 130 adopts a microlens array, which can also be replaced by other homogenizing beam devices such as a spatial light modulator and a diffractive optical element; the first transparent isolation unit 151 and the second transparent isolation unit 211 both adopt flat glass to ensure the lossless passage of light energy and signals while reducing the impact of rotation on transmission efficiency.

[0045] The first optical fiber 152 is used to output the signal of the external signal source to the second optical fiber 212 through the second collimation unit 153 and the third collimation unit 213 in sequence, and to receive the signal of the external signal source transmitted by the second optical fiber 212 through the third collimation unit 213 and the second collimation unit 153 in sequence, so as to realize bidirectional transmission of the signal.

[0046] In this embodiment, the photoelectric conversion unit 220 adopts a photovoltaic panel; the second collimating unit 153 and the third collimating unit 213 both adopt a collimating lens.

[0047] In other embodiments, the signal transmission stator unit 150 and the signal transmission rotor unit 210 are respectively the stator end and the rotating end of a multi-channel fiber optic rotary connector; or, the signal transmission stator unit 150 and the signal transmission rotor unit 210 are respectively the stator end and the rotating end of a single-channel fiber optic rotary connector.

[0048] The working principle of the present invention is as follows:

[0049] The first collimating unit 110 collimates the input light beam to form an incoherent beam combination input to the beam expansion system 120. The beam expansion system 120 expands the incoherent beam combination and inputs the expanded light beam to the homogenizing unit 130. The homogenizing unit 130 homogenizes the expanded light beam. The hollow beam unit 140 then converts the homogenized light beam into a hollow beam and inputs the hollow beam into the photoelectric conversion unit 220. The photoelectric conversion unit 220 then converts the hollow beam into electrical energy to complete the laser energy transmission.

[0050] At the same time, the signal transmission stator unit 150 receives the signal from the external signal source and outputs it to the signal transmission rotor unit 210 to achieve signal transmission, or the signal transmission rotor unit 210 receives the signal from the external signal source and outputs it to the signal transmission stator unit 150 to achieve signal transmission; specifically, the first optical fiber 152 outputs the signal from the external signal source to the second collimation unit 153, which is collimated by the second collimation unit 153 and output to the third collimation unit 213, which is then output to the second optical fiber 212 to achieve signal transmission; or, the second optical fiber 212 outputs the signal from the external signal source to the third collimation unit 213, which is collimated by the third collimation unit 213 and output to the second collimation unit 153, which is then output to the first optical fiber 152 to achieve signal transmission.

[0051] In the rotating state, the photoelectric conversion unit 220 continuously converts the received light energy into electrical energy to achieve stable energy output; the first optical fiber 152 and the second optical fiber 212 continuously transmit optical signals with the help of the second collimation unit 153 and the third collimation unit 213 to achieve stable information output. The entire system can still ensure the synchronous and stable transmission of energy and signals in the rotating state, and adapt to the application requirements in high dynamic environments.

Claims

1. A laser wireless energy and signal synchronous transmission system for a rotary motion mechanism, characterized in that: It includes a stator part and a rotor part; The stator part comprises a stator housing (100), a first collimating unit (110) arranged in sequence along an optical path in the stator housing (100), a beam expansion system (120), a homogenizing unit (130), a hollow beam unit (140), and a signal transmission stator unit (150); the rotor part comprises a rotor housing (200), a signal transmission rotor unit (210) and a photoelectric conversion unit (220) arranged in sequence along an optical path in the rotor housing (200); The first collimating unit (110), the beam expanding system (120), and the homogenizing unit (130) are used to collimate, expand, and homogenize the input light beam, respectively; the hollow light beam unit (140) is used to transform the homogenized light beam into a hollow light beam and input it into the photoelectric conversion unit (220); the photoelectric conversion unit (220) is used to transform the hollow light beam into electrical energy to complete laser energy transmission; the central axis of the hollow light beam coincides with the rotation axis of the rotor housing (200); The signal transmission stator unit (150) and the signal transmission rotor unit (210) are both located on the axis of the rotating shaft of the rotor housing (200) and correspond to each other, and are used to realize bidirectional transmission of signals; The signal transmission stator unit (150) comprises a first transparent isolation unit (151), a first optical fiber (152) and a second collimation unit (153) arranged in a stator housing (100), and the second collimation unit (153) is arranged on the first transparent isolation unit (151); the signal transmission rotor unit (210) comprises a second transparent isolation unit (211), a second optical fiber (212) and a third collimation unit (213) arranged in a rotor housing (200), and the third collimation unit (213) is arranged on the second transparent isolation unit (211); the second collimation unit (153) and the third collimation unit (213) are both located on the axis of the rotation axis of the rotor housing (200); The hollow light beam sequentially transmits through the first transparent isolation unit (151) and the second transparent isolation unit (211) and enters the photoelectric conversion unit (220); The first optical fiber (152) is used to output the signal of the external signal source to the second optical fiber (212) through the second collimation unit (153) and the third collimation unit (213) in sequence, and to receive the signal of the external signal source transmitted by the second optical fiber (212) through the third collimation unit (213) and the second collimation unit (153) in sequence.

2. The laser wireless energy and signal synchronous transmission system for a rotary motion mechanism according to claim 1, characterized in that: The first transparent isolation unit (151) and the second transparent isolation unit (211) are both made of flat glass; and the second collimating unit (153) and the third collimating unit (213) are both made of collimating lenses.

3. The laser wireless energy and signal synchronous transmission system for a rotary motion mechanism according to claim 1 or 2, characterized in that: The hollow light beam unit (140) comprises a first conical lens (141) and a second conical lens (142) which are sequentially arranged along the light path; the diameter of the first conical lens (141) gradually decreases along the light path, and the diameter of the second conical lens (142) gradually increases along the light path.

4. The laser wireless energy and signal synchronous transmission system for a rotary motion mechanism according to claim 1 or 2, characterized in that: The hollow light beam unit (140) adopts one of an annular phase mask plate, a spatial light modulator, and a diffractive optical element.

5. The laser wireless energy and signal synchronous transmission system for a rotary motion mechanism according to claim 1, characterized in that: The first collimating unit (110) adopts a self-focusing lens array; the homogenizing unit (130) adopts a microlens array or a spatial light modulator.

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