CN111537961A

CN111537961A - Signal transmitter and detection device

Info

Publication number: CN111537961A
Application number: CN202010360404.7A
Authority: CN
Inventors: 王晓; 魏国东; 蔡江辉; 陈立潮
Original assignee: Taiyuan University of Science and Technology
Current assignee: Taiyuan University of Science and Technology
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-08-14

Abstract

The invention discloses a signal transmitter and a detection device, wherein the signal transmitter comprises: a first conductor plate; the dielectric cylinders are arranged on the upper surface of the first conductor plate and are uniformly distributed in a regular polygon region in a honeycomb lattice or triangular lattice mode to form photonic graphene; a second conductor plate covering the photonic graphene; the microwave antenna is positioned at the geometric center of the regular polygon area; the microwave antenna is used for transmitting detection signals; the photonic graphene is used for regulating and controlling the detection signal and emitting the detection signal from between the first conductor plate and the second conductor plate, and each edge of the regular polygon region is provided with the detection signal which is emitted vertically. By applying the signal emitter and the detection device provided by the invention, multi-directional signal emission and detection are realized.

Description

Signal transmitter and detection device

Technical Field

The invention relates to the technical field of photoelectric equipment, in particular to a signal emitter and a detection device.

Background

The detection device composed of the signal transmitter and the signal receiver can transmit detection signals through the signal transmitter, detect reflection signals of the detection signals through the signal receiver, can obtain required detection results through analysis and processing of the reflection signals, and is widely applied to the fields of fire fighting, national defense, aviation, mineral exploration and the like.

In the prior art, a signal emitter of the detection device generally can emit detection signals only in a single direction, so that multidirectional signal emission and detection are inconvenient to realize.

Disclosure of Invention

In view of the above, the present invention provides a signal transmitter and a signal detecting device, which can transmit and detect signals in multiple directions.

In order to achieve the above purpose, the invention provides the following technical scheme:

a signal transmitter, the signal transmitter comprising:

a first conductor plate;

the dielectric cylinders are arranged on the upper surface of the first conductor plate and are uniformly distributed in a regular polygon region in a honeycomb lattice or triangular lattice mode to form photonic graphene;

a second conductor plate covering the photonic graphene;

the microwave antenna is positioned at the geometric center of the regular polygon area; the microwave antenna is used for transmitting detection signals; the photonic graphene is used for regulating and controlling the detection signal and emitting the detection signal from between the first conductor plate and the second conductor plate, and each edge of the regular polygon region is provided with the detection signal which is emitted vertically.

Preferably, in the above signal transmitter, a position of the second conductor plate opposite to the geometric center has a through hole;

the signal emitter is provided with a first coaxial cable, one end of the first coaxial cable is provided with a joint connected with a network analyzer, the other end of the first coaxial cable is exposed out of the conductor inside and serves as the microwave antenna, and the microwave antenna is arranged at the geometric center through the through hole;

wherein the microwave antenna is insulated from both the first and second conductive plates.

Preferably, in the signal transmitter described above, a driving device is disposed on a lower surface of the first conductive plate, and is configured to drive the signal transmitter to rotate along a set rotation axis, where the set rotation axis is perpendicular to the first conductive plate and the second conductive plate.

Preferably, in the above signal emitter, the regular polygon is a hexagon, and the driving device can drive the signal emitter to rotate 30 ° counterclockwise or 30 ° clockwise relative to the initial position.

Preferably, in the above signal transmitter, the dielectric cylinder is an alumina cylinder, and has a radius of 3mm, a height of 10mm, a dielectric constant of 8.5, and a magnetic permeability of 1.

Preferably, in the above signal transmitter, the first conductor plate and the second conductor plate are circular aluminum alloy plates having the same diameter, and a thickness of the circular aluminum alloy plate is 10 mm.

Preferably, in the above signal transmitter, the dielectric cylinders are located at lattice points of the photonic graphene, and a distance between two nearest lattice points is 7.21 mm.

The present invention also provides a detection apparatus, comprising:

a signal emitter as claimed in any one of the above;

a signal receiver including a plurality of receiving antennas disposed on an upper surface of the second conductor plate; the receiving antennas correspond to the sides of the regular polygon area one by one and are used for receiving reflected signals of detection signals emitted from the corresponding sides.

Preferably, in the above-described probe apparatus, the receiving antenna has a connector for connecting to a second coaxial cable and a horn waveguide for receiving the reflected signal, and the receiving antenna is connected to a network analyzer through the second coaxial cable.

Preferably, in the above-described probe apparatus, a Zigbee node is further fixed to the receiving antenna.

As can be seen from the above description, in the signal emitter and the detection device provided in the technical solution of the present invention, the plurality of dielectric cylinders are disposed in the regular polygon region between the first conductor plate and the second conductor plate to form the photonic graphene, the microwave antenna is disposed at the geometric center of the regular polygon region, the microwave antenna emits the detection signal, the photonic graphene regulates and controls the detection signal, and the detection signal is emitted from between the first conductor plate and the second conductor plate, so that each side of the regular polygon region has the detection signal emitted vertically, thereby implementing multi-directional signal emission and detection.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a graph of the radiated electric field of a point source with the point source disposed in a zero-refraction material;

fig. 2 is a top view of a signal transmitter according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a signal transmitter according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a first coaxial cable according to an embodiment of the present invention;

FIG. 5 is a diagram of an electric field profile excited by a power supply in photonic graphene according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a probe apparatus according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a receiving antenna according to an embodiment of the present invention;

FIG. 8 is a top view of a probing apparatus according to an embodiment of the present invention;

fig. 9 is a cross-sectional view of a probe apparatus according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The conventional infrared detector capable of realizing multi-directional signal emission and detection comprises: base, rotary rod and joint seat, rotary rod one end is equipped with the bulb, the joint seat sets up in the other end of rotary rod, be provided with the adapter sleeve on the base, a fixed lid is established to the cover on the adapter sleeve, the adapter sleeve has spherical first depressed part, fixed lid has spherical second depressed part, the bulb is arranged in first depressed part with the second depressed part encloses and closes in the spherical cavity that forms. The ball head of the rotating rod is placed in the spherical cavity enclosed by the connecting sleeve and the fixing cover to rotate, so that the support swings, and when the support is installed on an infrared detector, the infrared detector can detect in multiple directions. The omnibearing detection is mainly realized by the swinging of the bracket.

Above-mentioned infrared detector mainly realizes multi-angle, diversified the surveying through the swing of support, but the swing of this kind of support needs the manual operation, will increase extra expense like this to can only survey a position at the same moment, can not compromise a plurality of positions simultaneously.

In order to solve the above problem, an embodiment of the present application provides a signal emitter and a detection apparatus, where the signal emitter controls and emits a detection signal through an optical characteristic of a microstructure of photonic graphene, and does not need additional overhead, and the detection signal can be reflected in multiple directions and detected in corresponding directions. Furthermore, through the matching of the driving device, the emitter rotates clockwise and anticlockwise/anticlockwise at a small angle, such as 30 degrees, efficient all-directional detection can be realized, the structure is simple, the operation is convenient, and the price is low.

The following explains the relevant terms and principles of the technical scheme of the invention for detecting signals by using photon graphene for regulation and control and multi-directional emission.

Photonic Crystal (Photonic Crystal): is an artificial microstructure formed by periodically arranging medium materials with different refractive indexes. Photonic crystals are photonic band gap materials, and from the viewpoint of material structure, photonic crystals are artificially designed and manufactured crystals with periodic dielectric structures on the optical scale. Similar to the regulation of the semiconductor lattice on the electronic wave function, the photonic band gap material can regulate and control electromagnetic waves with corresponding wavelengths, and when the electromagnetic waves are transmitted in the photonic band gap material, the energy of the electromagnetic waves forms an energy band structure because of the regulation and control due to Bragg scattering. A band gap, i.e., a photonic band gap, occurs between the energy bands. Photons with energies within the photonic bandgap cannot enter the crystal.

Lattice: the crystal has a skeleton formed by the periodic arrangement of the centers of gravity of the particles, and is called a crystal lattice.

Lattice points are as follows: the position at which the center of gravity of the particle is located is called a lattice point (or node) of the lattice.

Lattice constant (or lattice constant): what is meant is the side length of the unit cell. The most basic geometric units that make up a crystal are called unit cells.

Photon graphene: photonic crystals with a honeycomb or triangular lattice are known as photonic graphene. The photonic graphene in the present application is a photonic graphene having a honeycomb lattice.

The energy bands of the photonic graphene intersect at a point at the first brillouin zone boundary, which is called the dirac point, and the dispersion relation near the dirac point is linear. By adjusting the relevant parameters of the photonic graphene, energy band degeneracy with a linear dispersion relation also occurs in the center of the Brillouin zone, and the degeneracy point is called a Dirac-like point.

The first brillouin zone is the wigner-saitz cells of the reciprocal lattice, and if the cells are made for each reciprocal lattice, they will fill the whole wave vector space without gaps. Since the energy and state of the moving electrons, phonons, magnons, … …, etc. element excitations (see element excitations in solids) in the complete crystal are periodic functions of the reciprocal lattice, only the wave vector in the first brillouin zone is needed to describe the states of the band electrons, lattice vibrations and spin waves … … and determine their energy (frequency) and wave vector relationships. The wave vector confined to the first brillouin zone is called the reduced wave vector, and the first brillouin zone is called the reduced zone, to which reference is often made to a brillouin zone that is not otherwise stated in the literature.

The zero-refractive-index material has unique electromagnetic wave control characteristics, the zero-refractive-index material has a dielectric constant or magnetic conductivity close to zero, the refractive index of the zero-refractive-index material is also close to zero, the wavelength of the electromagnetic wave in the zero-refractive-index material tends to infinity at the moment, the propagation phase is close to zero, and the characteristics endow the zero-refractive-index material with the electromagnetic wave control capability exceeding the natural electromagnetic wave control capability. The photonic graphene can be equivalent to a near-zero refractive index material in structure by designing appropriate parameters. The zero-refractive-index material has a high directional radiation effect, which means that a wave source placed in the zero-refractive-index material can radiate electromagnetic waves perpendicular to the surface of the zero-refractive-index material and maintain good directivity.

Zigbee is a bidirectional wireless communication technology (also called Zigbee protocol), can work on three frequency bands of 2.4GHz, 868MHz and 915MHz, respectively has the highest transmission rates of 250kbit/s, 20kbit/s and 40kbit/s, and the transmission distance of the Zigbee is within the range of 10-75m, but can be increased continuously. As a wireless communication technology, Zigbee has the following characteristics: low power consumption, low cost, short time delay, large network capacity, reliability and safety. The method is mainly used for data transmission among various electronic devices with short distance, low power consumption and low transmission rate and is typically applied to periodic data transmission, intermittent data transmission and low-reaction-time data transmission.

In the field of sensors, photonic crystals have a wide range of applications. Currently, photonic crystal sensors mainly include fluorescence sensors, colorimetric sensors, fiber optic sensors, pressure sensors, and the like.

The fluorescence sensor is based on the photonic crystal fluorescence enhancement effect, and a photonic crystal structure is introduced into a traditional fluorescence detection system, so that the fluorescence signal intensity is enhanced, the detection sensitivity is improved, and the detection limit is reduced. The method can realize high-sensitivity detection of various substances such as molecules, ions, DNA, proteins and the like.

The colorimetric sensor depends on the periodic structure of the photonic crystal to change under the stimulation of the external environment, so that the color of the photonic crystal changes macroscopically. The photonic crystal chromaticity sensor can recognize color change by naked eyes to realize qualitative and semi-quantitative detection, and can also measure by a spectrometer to obtain a quantitative result.

The measuring method of the optical fiber sensor is a measuring method which uses an optical fiber as a transmission and sensing medium of an optical signal, modulates certain property of the optical signal according to the change of a measured physical quantity and detects the change of the measured physical quantity. Optical fiber sensors can be divided into two main categories according to sensing mechanism: one is to sense the physical quantity to be measured and change the physical property of the optical fiber; one is a passive type sensor that collects a light intensity signal transmitted from a target using an optical fiber. The existing photonic crystal fiber sensor for pressure measurement according to the temperature self-compensation principle uses a photonic crystal fiber, can detect gas according to the spectral absorption principle, and performs an absorption line experiment of acetylene (ethylene) and hydrogen cyanide (hydrogen cyanide) by using a photonic band gap type photonic crystal fiber sensor.

The pressure sensor can be manufactured by utilizing the characteristic that the band gap of the photonic crystal changes along with the pressure, and the sensitivity and the measuring range of the sensor are influenced by the material characteristics of the photonic crystal and the spectral resolution of a detection system. When the sensor is laterally pressurized, the material with the same elastic modulus and Poisson ratio is selected, so that the sensitivity of the sensor can be improved, and the measurement range can be enlarged. The photonic crystal pressure sensor has small volume and light weight, and can be widely applied to industry and military by combining optical fiber transmission.

The above photonic crystal sensors are all based on the properties of the periodic structure of the photonic crystal, such as: photonic band gap, and little attention has been paid to the structural characteristics of honeycomb lattice photonic crystals and the characteristics of zero refractive index materials. The photonic crystal with the graphene lattice has a very peculiar phenomenon on the regulation and control of a light path based on a novel photonic crystal microstructure material with the graphene structure.

The equivalent dielectric constant and the equivalent magnetic permeability of the photonic graphene at the Dirac-like point frequency are both zero, and can be equivalent to a zero-refractive-index material, and the field distribution in the structure is relatively uniform without phase change. Therefore, after the wave coming out of the waveguide port enters the photonic crystal of the square lattice, the triangular lattice or the honeycomb lattice, the electric field distribution inside the structure near the frequency of the Dirac-like point is a relatively uniform field, and the equivalent wavelength is infinite.

The core principle of the embodiment of the invention is to obtain the equivalent dielectric constant and the equivalent magnetic permeability of the structure by using an average intrinsic field method. By adjusting the structural parameters (including the lattice constant, the radius of a dielectric column and the dielectric constant) of the honeycomb lattice photonic graphene, an accidental-merged dual dirac point (a quadruple-merged dirac cone, which can also be called a dirac-like point) appears in the center of a Brillouin zone in an energy band, the dispersion relation near the dual dirac point is linear, and then CST three-dimensional electromagnetic field simulation software is used for calculating the electric field distribution of the quadruple-merged eigenstate at the dual dirac point. For a primitive cell of the cellular lattice photon graphene, the average electric field intensity of the primitive cell is calculated by applying the formula (1)

And average magnetic field strength

Then, the equivalent dielectric constant is calculated by the formula (2)_effectiveAnd equivalent permeability mu_effectiveWherein A is the volume of the photon graphene primitive cell,

and

respectively the electric field intensity and the magnetic field intensity at the (x, y) position in the primitive cell, k and omega respectively the wave vector and the angular frequency of the dual dirac points,₀and mu₀The dielectric constant and permeability in vacuum. The equivalent dielectric constant and the equivalent permeability of the dual dirac points are both zero, that is, the photonic graphene is equivalent to a zero-refractive-index material at the dual dirac point frequency.

The refractive and reflective properties of electromagnetic waves in zero-refraction materials. It is known that electromagnetic waves are refracted and reflected at interfaces of materials with different refractive indexes, and the law of refraction n is used for_isin θ_i＝n_osin θ_o(n_iAnd n₀Refractive indices of the incident and emergent media, respectively, theta_iAnd theta₀Angle of incidence and angle of refraction, respectively) are known: (1) when the incident medium is a zero-index material and the emergent medium is air, i.e. n_iN ≈ 0, and n_oN is the refractive index of the medium, and θ is the angle of incidence_iAll have theta _o0. This means that a wave source placed in the zero-refractive-index material will radiate electromagnetic waves perpendicular to the surface of the zero-refractive-index material and maintain good directivity, which is called the high directivity radiation effect of the zero-refractive-index material, as shown in fig. 1, which is a radiation electric field diagram of a point source with a point source placed in the zero-refractive material. As can be seen from fig. 1, the outgoing waves from the sides of the rectangular medium have good directivity. (2) When the incident medium is air and the emergent medium is a zero-index material, i.e. n_i1, and n_oN ≈ 0, only θ_iAn incident wave that is approximately 0 can be transmitted into a zero index material because the critical angle for total reflection is close to zero. Combining the above two cases, only when it comes toThe wave front of the emergent wave is parallel to the incident surface of the zero-refractive-index material (namely normal incidence), the electromagnetic wave can enter the zero-refractive-index material, and when the electromagnetic wave exits into the air, the wave front of the emergent wave in the air depends on the shape of the emergent surface of the zero-refractive-index material. Based on the characteristic, wave front 'clipping' and regulation can be achieved. For example, by designing the boundary shape of the photonic graphene, outgoing waves with good directivity in multiple directions can be realized near a frequency point with zero refractive index.

The foregoing is the core idea of the embodiments of the present invention, and in order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 2 and 3, fig. 2 is a top view of a signal transmitter according to an embodiment of the present invention, and fig. 3 is a cross-sectional view of the signal transmitter according to the embodiment of the present invention.

As shown in fig. 2 and 3, the signal transmitter includes: a first conductor plate 2; the dielectric cylinders 1 are arranged on the upper surface of the first conductor plate 2, and the dielectric cylinders 1 are uniformly distributed in a regular polygon region in a honeycomb lattice or triangular lattice mode to form photonic graphene; a second conductor plate 2' covering the photonic graphene; a microwave antenna 8 positioned at the geometric center 3 of the regular polygon area; the microwave antenna 8 is used for transmitting detection signals; the photonic graphene is used for regulating and controlling the detection signal so as to control the frequency and the propagation direction of the detection signal, the detection signal is emitted from between the first conductor plate 2 and the second conductor plate 2', and each edge of the regular polygon region has the detection signal emitted vertically.

The first conductor plate 2 and the second conductor plate 2' may be aluminum alloy plates, and may have the same circular plate-like structure. In the embodiment of the present invention, the first conductor plate 2 and the second conductor plate 2' are circular aluminum alloy plates having the same diameter, and the thickness of the circular aluminum alloy plate is 10 mm.

The medium cylinder 1 is an aluminum oxide cylinder, the radius is 3mm, the height is 10mm, the dielectric constant is 8.5, and the magnetic conductivity is 1. In the present example, there were 1350 medium cylinders 1 in total. It should be noted that the relevant parameters of the media cylinder 1 can be set based on the requirements, and are not limited to the manner described in the embodiment of the present invention.

Further, the dielectric cylinder 1 is located at a lattice point of the photonic graphene, and a distance between two nearest lattice points is 7.21 mm. In the photonic graphene, if n lattice points are provided, where n is a positive integer, 1 dielectric cylinder 1 is respectively arranged on the n lattice points, and the geometric center 3 is preferentially arranged on the microwave antenna 8.

In the embodiment of the present invention, the second conductor plate 2' has a through hole at a position opposite to the geometric center 3; the signal transmitter is provided with a first coaxial cable 9, one end of the first coaxial cable 9 is provided with a joint 10 connected with a network analyzer, the other end of the first coaxial cable is exposed to the inside conductor to be used as a microwave antenna 8, and the microwave antenna 8 is arranged at the geometric center 3 through the through hole; wherein the microwave antenna 8 is insulated from both the first conductor plate 2 and the second conductor plate 2'. The conductor may be a silver plated copper wire. It should be noted that the joint 10 is an SMA male joint.

Fig. 4 shows a structure of the first coaxial cable 9, and fig. 4 is a schematic structural diagram of the first coaxial cable according to an embodiment of the present invention. As shown in fig. 4, the first coaxial cable 9 has a conductor, an inner insulating layer 12 surrounding the conductor, a silver-plated copper wire layer 7 surrounding the inner insulating layer 12, and an outer insulating layer 13 surrounding the silver-plated copper wire layer 7, and has a connector 10 for connecting a network analyzer at one end of the first coaxial cable 9, and a conductor and a silver-plated copper wire 7 exposed inside at the other end, the exposed silver-plated copper wire 7 being placed in a through hole, and the exposed conductor being a microwave antenna 8 placed at the geometric center 3 through the through hole.

In the embodiment of the present invention, a driving device 6 is disposed on a lower surface of the first conductive plate 2, and is configured to drive the signal transmitter to rotate along a set rotation axis, where the set rotation axis is perpendicular to the first conductive plate 2 and the second conductive plate 2'. Wherein the driving device 6 may be a motor. It should be noted that the photonic graphene is disposed in the central regions of the two conductor plates, and the set rotating shaft coincides with the geometric center 3, so as to ensure the stability of the driving device 6 driving the signal emitter to rotate along the set rotating shaft.

Wherein, the regular polygon is a hexagon, and the driving device 6 can drive the signal emitter to rotate 30 ° counterclockwise or 30 ° clockwise relative to the initial position. The regular polygon may be a regular dodecagon, a regular icosahedron, a regular forty-dihedral, or the like, and the number of the corresponding receiving devices is 12, 24, 42, or the like, and 12, 24, or 42 azimuths can be detected at the same time.

In the mode shown in fig. 2, a microwave antenna 8 is placed at the geometric center 3, and an electric field generated by the microwave antenna 8 is emitted from the geometric center 3 between the two conductor plates in the form of a point source along the axial linear polarization of the dielectric cylinder 1, so that optical signals are transmitted in the form of plane waves along six boundaries after passing through the photonic graphene structure, an included angle between adjacent optical signals is about 60 degrees, and when the driving device 6 drives the signal emitter to rotate 30 degrees left and right, all-directional emission of signals in a plane can be realized.

Further, the microwave antenna 8 at the geometric center 3 is a first coaxial cable 9, and the microwave antenna 8 of the first coaxial cable 9 is vertically arranged between the first conductor plate 2 and the second conductor plate 2' at the geometric center 3, and is not in contact with the upper and lower conductor plates. The drive means 6 is connected to the first conductor plate 2 at the geometric centre 3, and the connection 10 of the first coaxial cable 9 is connected to the signal output of the network analyzer. The signal output by the network analyzer thus emerges at the geometric center 3 in the form of a point source after passing through the first coaxial cable 9.

As shown in fig. 5, fig. 5 is an electric field profile of a point source excited in photonic graphene in an embodiment of the present invention. As shown in fig. 5(a), the light beams in six directions are emitted perpendicularly to the boundary, and the directivity is particularly good; as shown in fig. 5(b), signal transmission and transmission in six directions at the same time are realized by using a special optical path control mechanism, namely, photonic graphene, and 360-degree detection in a plane can be realized by installing a driving device below the signal transmitter.

It can be known from the above description that, in the signal emitter provided in the embodiment of the present application, the signal emitter can be equivalent to the optical property of the zero refractive index material through the photonic graphene microstructure to realize the regulation and the emission of the detection signal, the photonic graphene can be equivalent to the zero refractive index material under the appropriate condition, and the detection signal is emitted in a multi-azimuth manner at the same time by designing the structural boundary of the regular polygon. Furthermore, through the cooperation of the driving device, the emitter rotates clockwise/anticlockwise by a small angle, such as 30 degrees, on the horizontal plane, so that efficient all-dimensional detection can be realized, and the device is simple in structure, convenient to operate and low in price.

And a signal receiver comprising the receiving antenna 4 can be directly integrated on the signal transmitter, so as to realize simultaneous detection of multi-azimuth reflected signals, and the specific implementation manner can be described with reference to the following embodiments.

Based on the above embodiment, another embodiment of the present invention provides a detection device, which is based on the signal transmitter in the above embodiment to realize omnidirectional detection.

As shown in fig. 6, fig. 6 is a schematic structural diagram of a detection apparatus according to an embodiment of the present invention.

In the manner shown in fig. 6, the detection means comprises:

a signal transmitter, wherein the signal transmitter is the signal transmitter in the above embodiment; a signal receiver comprising a plurality of receiving antennas 4 arranged on the upper surface of the second conductor plate 2'; the receiving antennas 4 correspond to the sides of the regular polygon area one by one and are used for receiving the reflected signals of the detection signals emitted from the corresponding sides.

Wherein, the receiving antenna 4 has a connector 11 for connecting a second coaxial cable (not shown in the figure) and a horn waveguide for receiving the reflected signal, and the receiving antenna 4 is connected with a network analyzer through the second coaxial cable. As shown in fig. 7, fig. 7 is a schematic structural diagram of a receiving antenna according to an embodiment of the present invention. Fig. 7(a) is a top view of the receiving antenna 4, and fig. 7(b) is a cross-sectional view of the receiving antenna 4. As shown in fig. 7, the receiving antenna 4 has a horn waveguide 15 and a joint 11, and the position 5 is a position where the receiving antenna 4 is mounted. The change of the detection signal reflected from the six directions can be detected by using the receiving antenna 4, thereby performing detection. The size of the horn waveguide 15 can be determined according to the actual size of the structure, so as to achieve the optimal receiving effect. It should be noted that the joint 11 is an SMA female joint.

Further, a Zigbee node 16 is also fixed on the receiving antenna 4. As shown in fig. 8, the hexagonal photonic graphene may be divided into mounting positions 5 of 6 receiving antennas 4 by using the geometric center of the hexagonal photonic graphene corresponding to six sides, and one receiving antenna 4 and one Zigbee node 16 are respectively disposed on the second conductor plate 2' corresponding to each mounting position 5.

As shown in fig. 8 and 9, fig. 8 is a top view of a detecting device according to an embodiment of the present invention, and fig. 9 is a cross-sectional view of the detecting device according to the embodiment of the present invention. In the technical scheme of the present application, the signal transmitter and the signal receiver, the driving device 6, the network analyzer 17 and the Zigbee coordinator 14 are connected to each other, so that the omnidirectional detection can be performed, and the detection signal is transmitted to the computer of the user in a wireless communication manner. The Zigbee coordinator 14 may be configured to select some suitable parameters to establish a network according to the scanning situation, and transmit the detection data to the user computer. Only one Zigbee coordinator 14 is allowed per Zigbee network, and the Zigbee coordinator 14 first selects a channel and network identity (PANID) and then starts the network. The receiving antenna 4 receives the reflected signal of the detection signal emitted from the corresponding edge and transmits the reflected signal to the Zigbee node 16, the Zigbee node 16 joins the network through the Zigbee coordinator 14 and transmits the reflected signal to the Zigbee coordinator 14 in a wireless transmission manner, and the Zigbee coordinator 14 transmits the detection data to the user computer.

The multi-azimuth detection device provided by the embodiment of the invention can detect electromagnetic waves in a frequency range of 20.5-21.5 GHz, wherein the frequency range is determined by the structural parameters of the photon graphene, the structural parameters change, and the detection frequency range also changes. The infrared sensor can be applied by changing the parameters to enable the detection frequency range to be in the infrared band. The detector or sensor equipped with the device can be used in various monitoring and detecting occasions and can also be used for detecting various unidentified objects in the military.

The device can be used for a microwave detector or an infrared sensor, and the sensor (detector) consists of a signal transmitter, six receiving antennas 4, a basic circuit, a driving device 6 and a zigbee wireless communication module. The optical signals from the signal transmitter are transmitted along six directions, the six receivers are used for receiving the reflected signals in the corresponding directions, the basic circuit processes the optical signals to judge whether one or more obstacles exist, and the detection of multiple directions at the same moment is realized, and the detection of all directions in a plane is realized by rotating the driving device 6 by 30 degrees left and right. The detector or sensor equipped with the device can be used in various monitoring and detecting occasions and can also be used for detecting various unidentified objects in the military.

Note that, the following two points need to be noted in this detection apparatus: 1) the radius and dielectric constant of the dielectric cylinder 1, and the lattice constant of the photonic graphene determine the detection frequency range of the detection device and the size of the device. The detection means can detect at different frequency bands. Such as microwave, infrared, only different dielectric materials, such as alumina ceramics, etc., need to be selected. 2) The position of the signal emitter needs to be placed at a geometric center, the signal emitter cannot be placed at any place, and the electromagnetic waves emitted from 6 directions of the photonic graphene structure can be ensured to have better directivity only by being placed at a proper position. In the embodiment of the present application, the photonic graphene structure may be a regular hexagon, a regular dodecagon, a regular icosahedron, or the like, and is not limited to the structure shown in the figure of the present application, and the more the number of sides, the more the directions that can be detected at the same time.

Therefore, the detection device can be used in various sensors or detectors to realize in-plane full-angle detection. The novel material of photon graphite alkene is used to control the light path in signal transmitter the inside, makes its multi-angle transmission, realizes that the light that signal transmitter came out is along a plurality of position transmissions in the plane to can launch the detection signal in a plurality of positions simultaneously and correspond each position reflected signal's simultaneous detection. Furthermore, the omnibearing detection can be realized by rotating a driving device below the conductor plate by a small angle or increasing the number of boundaries of the photonic graphene structure. The all-directional detection sensor is simple in structure, economical and practical. Can be used for various protection and monitoring systems.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the detection device disclosed by the embodiment, since the detection device corresponds to the signal emitter disclosed by the embodiment, the description is simple, and the relevant points can be referred to the partial description of the signal emitter.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A signal transmitter, characterized in that the signal transmitter comprises:

a first conductor plate;

a second conductor plate covering the photonic graphene;

2. The signal transmitter of claim 1, wherein the second conductor plate has a through hole at a position opposite to the geometric center;

3. The signal transmitter of claim 1, wherein the lower surface of the first conductive plate is provided with a driving device for driving the signal transmitter to rotate along a set rotation axis, and the set rotation axis is perpendicular to the first conductive plate and the second conductive plate.

4. The signal transmitter of claim 3, wherein the regular polygon is a hexagon, and the driving device is capable of driving the signal transmitter to rotate 30 ° counterclockwise or 30 ° clockwise relative to the initial position.

5. The signal transmitter of claim 1, wherein the dielectric cylinder is an alumina cylinder having a radius of 3mm, a height of 10mm, a dielectric constant of 8.5, and a magnetic permeability of 1.

6. The signal transmitter of claim 1, wherein the first and second conductor plates are circular aluminum alloy plates of the same diameter, the circular aluminum alloy plates having a thickness of 10 mm.

7. The signal emitter of claim 1, wherein the dielectric cylinders are located at grid points of the photonic graphene, and a distance between two nearest grid points is 7.21 mm.

8. A probe apparatus, characterized in that the probe apparatus comprises:

a signal transmitter according to any one of claims 1 to 7;

9. The apparatus of claim 8, wherein the receiving antenna has a connector for connecting to a second coaxial cable and a horn waveguide for receiving the reflected signal, the receiving antenna being connected to a network analyzer through the second coaxial cable.

10. The apparatus according to claim 8, wherein a Zigbee node is further fixed on the receiving antenna.