CN113960571A - Radar system - Google Patents
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- CN113960571A CN113960571A CN202111584615.XA CN202111584615A CN113960571A CN 113960571 A CN113960571 A CN 113960571A CN 202111584615 A CN202111584615 A CN 202111584615A CN 113960571 A CN113960571 A CN 113960571A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention relates to the field of optical systems, and particularly discloses a radar system.A transmitting component transmits light to the outside and acquires light reflected back from the outside, the light returned from the outside is incident on a filtering device to form a first light beam incident on the filtering device, the filtering device is used for respectively incident first to N light beams to a filtering element and respectively emitting the first to N light beams after passing through the filtering element, an ith light guide device is used for guiding an ith light beam emitted by the filtering device, the ith light beam is incident on the filtering device to form an i +1 light beam incident on the filtering device, and an optoelectronic device converts the N light beam emitted by the filtering device into an electric signal. The light which passes through the filter element is guided to pass through the filter element again, the filter element is used for repeatedly filtering the acquired light returned from the outside, the filter element can be used for compressing the background light, the compression of the background light can meet the requirement, and the cost can be reduced.
Description
Technical Field
The invention relates to the field of optical systems, in particular to a radar system.
Background
In order to improve the measurement performance in the daytime, a high-performance filter needs to be used to compress the background light. In particular to a radar system for measuring Raman signals, the Raman signals are very weak, and the local oscillation signals need to be suppressed in multiple orders, so that the scattering signals with the same emission wavelength are prevented from being mixed into a Raman channel to form interference.
In practical application, the out-of-band rejection rate of the filter is required to reach a certain magnitude, and the conventional filter cannot meet the requirement, so that the filter needs to be produced in a customized manner, and the cost of the filter is high.
Disclosure of Invention
The object of the present invention is to provide a radar system capable of achieving a desired level of compression of background light and reducing the cost.
In order to achieve the purpose, the invention provides the following technical scheme:
a radar system comprises a transmitting assembly, a filter device, a light guide device and an optoelectronic device, wherein the transmitting assembly is used for transmitting light to the outside, acquiring the light reflected by the outside, and enabling the light returned by the outside to be incident to the filter device to become a first light beam incident to the filter device;
the optical filtering device is used for enabling incident first to Nth light beams to respectively enter the optical filtering element and enabling the first to Nth light beams after passing through the optical filtering element to respectively emit out, the ith light guide device is used for conducting the ith light beam emitted by the optical filtering device and enabling the ith light beam to enter the optical filtering device to become an i +1 th light beam incident to the optical filtering device, i belongs to [1, N-1], the photoelectric device is used for converting the Nth light beam emitted by the optical filtering device into an electric signal, and N is a positive integer larger than 1.
Preferably, the ends of the first light guide device to the N-1 th light guide device, which are located on the light outgoing side of the light filtering device, are sequentially arranged along a straight line, and the ends of the first light guide device to the N-1 th light guide device, which are located on the light incoming side of the light filtering device, are sequentially arranged along a straight line.
Preferably, the ends of the first light guide device to the (N-1) th light guide device, which are located on the light outlet side of the light filtering device, are sequentially arranged along the circumference, and the ends of the first light guide device to the (N-1) th light guide device, which are located on the light inlet side of the light filtering device, are sequentially arranged along the circumference.
Preferably, the first light guide device to the N-1 th light guide device all adopt optical fibers, one end of the first light guide device to the N-1 th light guide device, which is positioned on the light outlet side of the light filtering device, shares the same cladding, and one end of the first light guide device to the N-1 th light guide device, which is positioned on the light inlet side of the light filtering device, shares the same cladding.
Preferably, the light returned from the outside and acquired by the emission component is guided to be incident to the filter device through a first optical fiber, and the nth light beam emitted by the filter device is guided to be incident to the optoelectronic device through a second optical fiber;
the first light guide device to the N-1 light guide device and the end, at the light inlet side, of the first optical fiber of the light filtering device share the same cladding, and the first light guide device to the N-1 light guide device and the end, at the light outlet side, of the second optical fiber of the light filtering device share the same cladding.
Preferably, the optical filtering device includes a light shaping device, and the light shaping device is configured to collimate the first to nth incident light beams, so that the collimated first to nth light beams are incident on the optical filtering element, and the first to nth light beams passing through the optical filtering element are converged and emitted.
Preferably, the light shaping device includes a collimating component and a converging component, the first to nth incident light beams respectively enter the collimating component, the collimating component is configured to collimate the first to nth incident light beams respectively, so that the collimated first to nth light beams enter the filter element, and the converging component is configured to converge the first to nth light beams passing through the filter element to different positions respectively.
Preferably, a distance from any one of the first to nth light beams incident on the filter device to the optical axis of the light shaping device is smaller than a preset value.
Preferably, the light shaping device includes first to nth collimating components and first to nth converging components, the jth collimating component is configured to collimate an incident jth light beam, so that the collimated jth light beam is incident to the filter element, the jth converging component is configured to converge the jth light beam after passing through the filter element, and j is equal to [1, N ].
Preferably, the device further comprises a processing device connected to the emitting assembly and the optoelectronic device, respectively, for controlling the emitting assembly and the optoelectronic device to achieve time synchronization of emitted light and collected signal.
According to the technical scheme, the transmitting assembly of the radar system transmits light to the outside, acquires the light reflected by the outside, and transmits the light returned by the outside to the filtering device to form a first light beam transmitted to the filtering device, the filtering device is used for transmitting the first to the Nth incident light beams to the filtering element respectively and transmitting the first to the Nth light beams after passing through the filtering element respectively, the ith light guide device is used for guiding the ith light beam transmitted by the filtering device to transmit the ith light beam to the filtering device to form an i +1 light beam transmitted to the filtering device, i belongs to [1, N-1], and the photoelectric device converts the Nth light beam transmitted by the filtering device into an electric signal.
The radar system guides the light which passes through the filter element to pass through the filter element again, so that the filter element is used for repeatedly filtering the acquired light returned from the outside, the filter element can be used for compressing the background light, the compression of the background light can meet the requirement, the requirement on the out-of-band rejection rate magnitude of a single filter element can be reduced, and the cost can be reduced.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a radar system according to an embodiment of the present invention;
fig. 2 is a schematic layout diagram of light guide devices and filter devices for guiding the first to nth light beams according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the arrangement positions of the light guide devices and the light filter devices for transmitting the first to Nth light beams according to another embodiment of the present invention;
FIG. 4 is a diagram illustrating a plurality of light guides sharing the same cladding layer according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a filter device according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a filter device according to another embodiment of the present invention;
fig. 7 is a schematic diagram of a radar system according to another embodiment of the present invention.
Reference numerals in the drawings of the specification include:
an emitting component-10, a filtering device-11, a filtering element-12 and an optoelectronic device-13;
a first light guide-14, an N-1 light guide-15;
a light guide means-101 for guiding the first light beam;
a light guide means-102 for guiding the second light beam;
a light guide device-103 for guiding the Nth light beam;
a third optical fiber-104, a fourth optical fiber-105, a fifth optical fiber-106;
a first cladding-107, a second cladding-108;
a collimating component-16, a converging component-17;
a light source device-18, a telescopic optical system-19 and a processing device-20.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all 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.
Referring to fig. 1, fig. 1 is a schematic diagram of a radar system according to this embodiment, and as shown in the figure, the radar system includes a transmitting assembly 10, a filter 11, a light guide device, and an optoelectronic device 13, where the transmitting assembly 10 is configured to emit light to the outside, acquire light reflected from the outside, and make the light returned from the outside incident on the filter 11 as a first light beam incident on the filter 11.
The optical filtering device 11 is configured to respectively enter the first to nth light beams into the optical filtering element 12, and respectively emit the first to nth light beams after passing through the optical filtering element 12, the ith light guiding device is configured to guide the ith light beam emitted from the optical filtering device 11, so that the ith light beam enters the optical filtering device 11 and becomes the (i + 1) th light beam entering the optical filtering device 11, i ∈ [1, N-1], the optoelectronic device 13 is configured to convert the nth light beam emitted from the optical filtering device 11 into an electrical signal, and N is a positive integer greater than 1.
The light returned from the outside acquired by the emission module 10 is incident on the filter 11, and becomes a first light beam incident on the filter 11.
The filter device 11 makes the incident first light beam incident on the filter element 12 and emits the first light beam passing through the filter element 12, and the first light guide device 14 guides the first light beam emitted from the filter device 11, so that the first light beam is incident on the filter device 11 and becomes a second light beam incident on the filter device 11. By analogy, the nth-1 light guide device 15 guides the nth-1 light beam emitted by the filter device 11, so that the nth-1 light beam is incident on the filter device 11 and becomes the nth light beam incident on the filter device 11. Each light guide device guides the light beam emitted from the light outlet end of the filter device 11 to enter the light inlet end of the filter device 11. The radar system of the present embodiment can pass the acquired light returned from the outside through the filter element 12N times.
The radar system of the embodiment guides the light which passes through the filter element to pass through the filter element again, so that the filter element is used for repeatedly filtering the acquired light returned by the outside, the filter element can be used for compressing the background light, the compression of the background light can meet the requirement, the requirement on the out-of-band rejection rate magnitude of a single filter element can be reduced, and the cost can be reduced.
Optionally, the ends of the first light guide device to the N-1 th light guide device, which are located on the light outgoing side of the light filter device 11, are sequentially arranged along a straight line, and the ends of the first light guide device to the N-1 th light guide device, which are located on the light incoming side of the light filter device 11, are sequentially arranged along a straight line. The light beams emitted from the first light guide device to the N-1 th light guide device to the filter device 11 respectively enter the filter device 11, the incident positions of the light beams entering the filter device 11 are sequentially arranged along a straight line, the light beams are respectively emitted after passing through the filter device 11 and respectively enter the corresponding light guide devices, and the light beams can pass through the filter device 11 for multiple times.
Optionally, the ends of the first light guide device to the N-1 th light guide device on the light outgoing side of the light filter device 11 may be sequentially arranged along a vertical straight line or a horizontal straight line, and correspondingly, the ends of the first light guide device to the N-1 th light guide device on the light incoming side of the light filter device 11 are sequentially arranged along a vertical straight line or a horizontal straight line. Referring to fig. 2, fig. 2 is a schematic diagram illustrating arrangement positions of the light guide devices and the filter devices for guiding the first to nth light beams in an embodiment, as shown in the figure, the ends of the light guide devices corresponding to the first to nth-1 light guide devices, which are located at the light incident side of the filter device 11, are sequentially arranged along a vertical straight line, wherein 101, 102, and 103 respectively represent the light guide devices for guiding the first light beam, the second light beam, and the nth light beam.
Optionally, the ends of the first light guide device to the nth-1 light guide device on the light outgoing side of the light filter device 11 are sequentially arranged along the circumference, and the ends of the first light guide device to the nth-1 light guide device on the light incoming side of the light filter device 11 are sequentially arranged along the circumference. The light beams emitted from the first light guide device to the nth-1 light guide device to the filter device 11 are respectively incident to the filter device 11, the corresponding light beams are sequentially arranged along the circumference at the incident position of the filter device 11, and are respectively emitted after passing through the filter device 11 and respectively incident to the corresponding light guide devices, so that the light beams can pass through the filter device 11 for multiple times.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating the arrangement positions of the light guide devices and the filter devices for guiding the first to nth light beams in another embodiment, as shown in the figure, the ends of the light guide devices corresponding to the first to nth-1 light guide devices, which are located at the light incident side of the filter device 11, are sequentially arranged along the circumference, wherein 101, 102, and 103 respectively represent the light guide devices for guiding the first light beam, the second light beam, and the nth light beam.
The first light guide device to the (N-1) th light guide device are arranged in sequence along a straight line or a circumference at one end of the light outlet side of the filter device 11 or at one end of the light inlet side of the filter device 11, and the arrangement of light paths of the system is relatively easy. It should be noted that the ends of the first to N-1 light guide devices on the light emitting side of the filter device 11 or the ends of the filter device 11 on the light incident side are not limited to the above-mentioned arrangement in sequence along a straight line or in sequence along a circumference, and in other embodiments, the arrangement may be performed in other manners, and are also within the protection scope of the present invention. In addition, preferably, the first to N-1 th light guiding devices may be disposed at equal intervals, that is, uniformly disposed at one end of the light filtering device 11 on the light outgoing side or one end of the light filtering device 11 on the light incoming side.
Preferably, the first light guide device to the N-1 th light guide device all use optical fibers, the ends of the first light guide device to the N-1 th light guide device on the light-emitting side of the light filter device 11 share the same cladding, and the ends of the first light guide device to the N-1 th light guide device on the light-emitting side of the light filter device 11 share the same cladding. Thus, one end of each light guide device is combined in the same cladding, and the arrangement position of each light guide device can be fixed.
Preferably, the light returned from the outside acquired by the emission component 10 is guided to enter the filter device 11 through a first optical fiber, and the nth light beam emitted by the filter device 11 is guided to enter the optoelectronic device 13 through a second optical fiber; the first light guide device to the N-1 light guide device and one end of the first optical fiber at the light inlet side of the light filter device 11 share the same cladding, and the first light guide device to the N-1 light guide device and one end of the second optical fiber at the light outlet side of the light filter device 11 share the same cladding. Referring to fig. 4, fig. 4 is a schematic diagram of a plurality of light guide devices sharing the same cladding in one embodiment, and as shown in the figure, one end of the third optical fiber 104 and one end of the fourth optical fiber 105 are located in the first cladding 107, two optical fiber cores are included in the first cladding 107, one end of the fourth optical fiber 105 and one end of the fifth optical fiber 106 are located in the second cladding 108, and two optical fiber cores are included in the second cladding 108, and each core respectively guides a light beam. In practical application, all fiber cores of the combined beam in the same optical fiber cladding layer can be arranged at equal intervals, so that the positions of all the fiber cores are conveniently arranged. The optical fiber structure can be manufactured by adopting a beam-combining optical fiber process.
Optionally, the optical filtering device 11 includes a light shaping device, and the light shaping device is configured to collimate the first to nth light beams respectively, so that the collimated first to nth light beams are incident to the optical filtering element 12, and the first to nth light beams passing through the optical filtering element 12 are respectively converged and emitted. The focusing positions of the emergent light beams are different, and the emergent light beams are respectively converged and incident to the corresponding light guide devices.
Optionally, the light shaping device includes a collimating component and a converging component, the first to nth incident light beams respectively enter the collimating component, the collimating component is configured to collimate the first to nth incident light beams respectively, so that the collimated first to nth light beams enter the filter element 12, and the converging component is configured to converge the first to nth light beams passing through the filter element 12 to different positions respectively. Referring to fig. 5, fig. 5 is a schematic diagram of a filter device according to an embodiment, in which a light beam is passed through the filter element 12 three times as an example. As shown in the figure, the filter device 11 includes a collimating component 16, a filter element 12 and a converging component 17, each light beam is incident to the collimating component 16, the collimated first to nth light beams are incident to the filter element 12, the light passing through the filter element 12 is incident to the converging component 17, and the first to nth light beams are converged to different positions by the converging component 17. The embodiment uses the same collimation assembly and the same convergence assembly to shape each light beam, can reduce the number of devices used by the system, and is beneficial to making the system compact in structure and reducing the system volume.
Preferably, a distance from any one of the first to nth light beams incident on the filter device 11 to the optical axis of the light shaping device is smaller than a preset value, and specifically, a distance from any one of the first to nth light beams incident on the filter device 11 to the optical axis of the collimating assembly may be smaller than a preset value. Therefore, the deviation distance of each light beam relative to the optical axis of the collimation assembly and the optical axis of the convergence assembly is small, the optical efficiency of the system is not influenced as much as possible, and the radar system has practical application value.
Optionally, the light shaping device may include first to nth collimating components and first to nth converging components, where the jth collimating component is configured to collimate an incident jth light beam, so that the collimated jth light beam is incident on the filter element 12, and the jth converging component is configured to converge the jth light beam after passing through the filter element 12, where j belongs to [1, N ]. Referring to fig. 6, fig. 6 is a schematic diagram of a filter device according to another embodiment, in which a light beam is passed through the filter element 12 three times. As shown in the figure, the filter device 11 includes three collimating components 16, three converging components 17 and a filter element 12, each light beam is incident to the corresponding collimating component 16, the collimated light passes through the filter element 12, and the corresponding converging component 17 converges the light after the corresponding light beam passes through the filter element 12. In practical applications, if a plurality of collimating components and a plurality of converging components are adopted to shape each incident light beam, a small-sized collimating component and a small-sized converging component are required to be used, and a large-sized filtering element is used in cooperation, so that each optical device can be arranged conveniently.
The collimating assembly 16 may include any one or combination of any number of convex lenses, concave lenses, or prisms. The converging component 17 may comprise any one or combination of any number of convex lenses, concave lenses, or prisms.
Referring to fig. 7, fig. 7 is a schematic diagram of a radar system according to another embodiment, where the emitting assembly 10 may include a light source device 18 and a telescopic optical system 19, the light source device 18 is configured to emit light to the outside, and the telescopic optical system 19 is configured to obtain light reflected back from the outside. The light source device 18 may employ a laser.
The radar system can further comprise a processing device 20 connected to the transmitting assembly 10 and the optoelectronic device 13, respectively, and the processing device 20 can control the transmitting assembly 10 and the optoelectronic device 13 to achieve time synchronization of the transmitted light and the collected signal. The processing device 20 may include a data acquisition board and an industrial personal computer, the photoelectric device 13 converts the light beam emitted by the filtering device 11 into an electrical signal, the data acquisition board realizes analog-to-digital conversion, and the converted data is transmitted to the industrial personal computer for calculation.
The filter element 12 may be used to compress the background light, i.e. to filter out the background light from the light returning from the outside by the filter element 12. The radar system leads the light which passes through the filter element to pass through the filter element again, so that the light passes through the filter element for multiple times, the filter element is used for filtering the light returned from the outside repeatedly, the compression of the background light can meet the requirement, and the high-level suppression of the out-of-band background light is realized. This may reduce the requirement for out-of-band rejection levels for individual filter elements, or may reduce the number of filter elements used, and therefore may reduce cost.
A radar system provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A radar system is characterized by comprising a transmitting assembly, a filter device, a light guide device and an optoelectronic device, wherein the transmitting assembly is used for transmitting light to the outside, acquiring the light reflected back from the outside, and enabling the light returned from the outside to be incident to the filter device to become a first light beam incident to the filter device;
the optical filtering device is used for enabling incident first to Nth light beams to respectively enter the optical filtering element and enabling the first to Nth light beams after passing through the optical filtering element to respectively emit out, the ith light guide device is used for conducting the ith light beam emitted by the optical filtering device and enabling the ith light beam to enter the optical filtering device to become an i +1 th light beam incident to the optical filtering device, i belongs to [1, N-1], the photoelectric device is used for converting the Nth light beam emitted by the optical filtering device into an electric signal, and N is a positive integer larger than 1.
2. The radar system of claim 1, wherein the first through N-1 light guides are arranged in a straight line at the light exit side of the filter, and the first through N-1 light guides are arranged in a straight line at the light entrance side of the filter.
3. The radar system of claim 1, wherein the first through N-1 light guides are arranged along a circumference at the light exit side of the filter, and the first through N-1 light guides are arranged along a circumference at the light entrance side of the filter.
4. The radar system of claim 1, wherein the first through N-1 light guides are all optical fibers, and the first through N-1 light guides share a common cladding layer at the light exit side of the filter, and the first through N-1 light guides share a common cladding layer at the light entrance side of the filter.
5. The radar system of claim 1, wherein the light returning from the outside captured by the transmitting assembly is guided to be incident on the filtering means through a first optical fiber, and the nth light beam emitted from the filtering means is guided to be incident on the optoelectronic means through a second optical fiber;
the first light guide device to the N-1 light guide device and the end, at the light inlet side, of the first optical fiber of the light filtering device share the same cladding, and the first light guide device to the N-1 light guide device and the end, at the light outlet side, of the second optical fiber of the light filtering device share the same cladding.
6. The radar system according to claim 1, wherein the filter device comprises a light shaping device, and the light shaping device is configured to collimate the incident first to nth light beams, respectively, to make the collimated first to nth light beams incident on the filter element, and to make the first to nth light beams passing through the filter element converge and emit the collimated first to nth light beams.
7. The radar system according to claim 6, wherein the light shaping device includes a collimating component and a converging component, the first to nth incident light beams are incident on the collimating component, the collimating component is configured to collimate the first to nth incident light beams, respectively, so that the first to nth collimated light beams are incident on the filter element, and the converging component is configured to converge the first to nth light beams passing through the filter element to different positions, respectively.
8. The radar system according to claim 7, wherein a distance from an optical axis of the light shaping means to any one of the first to nth light beams incident on the filter means is smaller than a predetermined value.
9. The radar system of claim 6 wherein said light shaping means comprises first through Nth collimating components and first through Nth converging components, the jth collimating component being configured to collimate an incident jth light beam such that the collimated jth light beam is incident on said filter element, the jth converging component being configured to converge the jth light beam after passing through said filter element, j e [1, N ].
10. The radar system of claim 1, further comprising processing means coupled to said transmitting assembly and said optoelectronic means, respectively, for controlling said transmitting assembly and said optoelectronic means to achieve time synchronization of the transmitted light and the acquired signal.
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