CN220626664U - FMCW laser radar range unit - Google Patents
FMCW laser radar range unit Download PDFInfo
- Publication number
- CN220626664U CN220626664U CN202322198268.8U CN202322198268U CN220626664U CN 220626664 U CN220626664 U CN 220626664U CN 202322198268 U CN202322198268 U CN 202322198268U CN 220626664 U CN220626664 U CN 220626664U
- Authority
- CN
- China
- Prior art keywords
- optical signal
- signal
- circulator
- optical
- polarization maintaining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 188
- 230000010287 polarization Effects 0.000 claims abstract description 59
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 15
- 230000001427 coherent effect Effects 0.000 claims description 23
- 239000013307 optical fiber Substances 0.000 claims description 13
- 238000001228 spectrum Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000035559 beat frequency Effects 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 230000003321 amplification Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000003199 nucleic acid amplification method Methods 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000002019 doping agent Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009131 signaling function Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model belongs to the technical field of optical detection, and particularly relates to an FMCW laser radar ranging device, which comprises: the device comprises a signal generation module, a polarization maintaining coupler, a circulator and a ranging module, wherein the signal generation module is connected with the polarization maintaining coupler, the polarization maintaining coupler is respectively connected with the ranging module and the circulator, the circulator is connected with the ranging module, the signal generation module is used for generating a first optical signal and sending the first optical signal to the polarization maintaining coupler, the polarization maintaining coupler is used for dividing the first optical signal into a second optical signal and a third optical signal, the circulator is arranged on an optical path transmitted by the third optical signal, the circulator is used for transmitting the third optical signal to a target object, the circulator is further used for receiving reflected light obtained after the third optical signal is reflected by the target object, and the ranging module is used for receiving the second optical signal and the reflected light.
Description
Technical Field
The utility model belongs to the technical field of optical detection, and particularly relates to an FMCW laser radar ranging device.
Background
The FMCW (Frequency Modulated Continuous Wave ) laser radar technology is a continuous wave laser-based ranging method, and compared with the traditional pulse laser radar, the FMCW laser radar has higher ranging precision and stronger anti-interference capability.
The working principle of the FMCW laser radar is that ranging is achieved by modulating the frequency of a laser, continuous laser waves are sent by the FMCW laser radar, the frequency is modulated with a certain linear change rate (commonly called slope), when the laser waves interact with a target object, part of the laser waves are scattered back by the target object and return to a receiver through an optical path, and after photoelectric conversion, the echo signals received by the receiver can obtain the distance information of the target object through frequency analysis.
Therefore, the FMCW laser radar has wide application prospect in the fields of automatic driving, industrial mapping, environmental monitoring and the like, can provide high-precision distance measurement, provides accurate environment sensing capability for an intelligent system, and further realizes safer and more efficient working and living environments.
In the current FMCW lidar ranging technology, after a light beam emitted by a lidar is emitted to a target object, reflected light needs to be received, and a plurality of lenses need to be arranged for receiving the reflected light, so that the size of the device can be increased, and errors are easy to exist due to the fact that the plurality of lenses are very complex in the actual coupling process of the reflected light.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: how to reduce the size of the device in FMCW lidar ranging technology.
The utility model achieves the aim through the following technical scheme:
the utility model provides an FMCW laser radar ranging device, comprising: the device comprises a signal generation module, a polarization maintaining coupler, a circulator and a ranging module;
the signal generation module is connected with the polarization maintaining coupler, the polarization maintaining coupler is respectively connected with the ranging module and the circulator, and the circulator is connected with the ranging module;
the signal generation module is used for generating a first optical signal and transmitting the first optical signal to the polarization maintaining coupler, and the polarization maintaining coupler is used for dividing the first optical signal into a second optical signal and a third optical signal;
the circulator is arranged on an optical path transmitted by the third optical signal, and is used for transmitting the third optical signal to a target object, and is also used for receiving reflected light obtained after the third optical signal is reflected by the target object;
the ranging module is used for receiving the second optical signal and the reflected light.
Preferably, the signal generating module comprises a signal generator and a distributed feedback laser, wherein a signal receiving end of the distributed feedback laser is connected with the signal generator, and a signal output end of the distributed feedback laser is connected with the polarization maintaining coupler;
the signal generator is used for generating a frequency modulation signal, and the distributed feedback laser is used for receiving the frequency modulation signal and outputting a first optical signal to the polarization maintaining coupler.
Preferably, the device further comprises an optical amplifier, wherein a signal receiving end of the optical amplifier is connected with the polarization maintaining coupler and is used for receiving the third optical signal and amplifying and transmitting the third optical signal to the circulator.
Preferably, the circulator comprises a first port, and the first port is connected with a signal output end of the optical amplifier;
the first port is used for receiving the third optical signal amplified by the optical amplifier.
Preferably, the device further comprises a collimator, the circulator further comprises a second port, and one end of the collimator is connected with the second port;
the second port is used for sending the third optical signal to the collimator, and the second port is also used for receiving the reflected light;
the collimator is used for collimating the third optical signal into parallel light beams.
Preferably, a collimating mirror is further arranged on the light path of the parallel light beam transmission;
the parallel light beam is directly irradiated to the target object after passing through the collimating mirror.
Preferably, after the parallel light beam irradiates the target object, the reflected light is obtained through reflection of the target object, and the reflected light passes through the collimating mirror and the collimator and is reflected back to the second port.
Preferably, the circulator further comprises a third port;
the third port is connected with the ranging module and is used for transmitting the reflected light received by the second port to the ranging module.
Preferably, the ranging module comprises an integrated coherent receiver and an oscilloscope, the integrated coherent receiver is respectively connected with the polarization maintaining coupler and the third port, and the oscilloscope is connected with the integrated coherent receiver;
the integrated coherent receiver is used for receiving the second optical signal and the reflected light and generating a beat signal;
the oscilloscope is used for carrying out Fourier transformation on the beat frequency signals so as to extract the frequency spectrum information in the beat frequency signals.
Preferably, the signal generating module is connected with the polarization maintaining coupler, the polarization maintaining coupler is connected with the circulator, the polarization maintaining coupler is connected with the ranging module, and the circulator is connected with the ranging module through optical fibers.
The beneficial effects of the utility model are as follows: according to the utility model, the signal generating module is arranged to emit the first optical signal, the polarization maintaining coupler is arranged to divide the first optical signal into the second optical signal and the third optical signal, the circulator is used to receive the third optical signal and transmit the third optical signal to the target object, the circulator also receives the reflected light reflected by the third optical signal on the target object and transmits the reflected light to the ranging module, the ranging module converts the distance of the target object according to the frequency and the like of the second optical signal and the reflected light, the circulator is used to receive and transmit the reflected light, excessive lenses are not required to be introduced, the size of the device is reduced, and errors are not easy to occur in the transmission of the reflected light.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a schematic structural diagram of an FMCW lidar ranging device according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a signal generating module of an FMCW lidar ranging device according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a circulator structure of an FMCW lidar ranging device according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of a ranging module of an FMCW lidar ranging device according to an embodiment of the present utility model;
fig. 5 is a schematic structural diagram of an FMCW lidar ranging device according to an embodiment of the present utility model;
fig. 6 is a schematic diagram of a ranging method of an FMCW lidar ranging device according to an embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other. The utility model will be described in detail below with reference to the drawings and examples.
It should also be noted that in this specification, relational terms such as first and second, and the like are 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. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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 process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Example 1
In the FMCW laser radar ranging technology, how to measure longer distance, the design of the device is simpler, the calculation is more convenient, and how to make the measurement accuracy higher is the problem to be solved by the technical point.
In order to solve the above-mentioned problems, as shown in fig. 1, an FMCW lidar ranging apparatus is proposed in the present embodiment, including: the device comprises a signal generation module, a polarization maintaining coupler, a circulator and a ranging module, wherein the signal generation module is connected with the polarization maintaining coupler, the polarization maintaining coupler is respectively connected with the ranging module and the circulator, the circulator is connected with the ranging module, the signal generation module is used for generating a first optical signal and sending the first optical signal to the polarization maintaining coupler, the polarization maintaining coupler is used for dividing the first optical signal into a second optical signal and a third optical signal, the circulator is arranged on an optical path transmitted by the third optical signal, the circulator is used for transmitting the third optical signal to a target object, the circulator is further used for receiving reflected light obtained after the third optical signal is reflected by the target object, and the ranging module is used for receiving the second optical signal and the reflected light.
The polarization-maintaining coupler is a 50% polarization-maintaining coupler and is used for dividing the incident first optical signal into two equal output light beams according to the polarization states of the first optical signal, namely a second optical signal and a third optical signal, and the second optical signal and the third optical signal function like a spectroscope, but can separate light beams and can separate according to the polarization states of the light beams, and the working principle of the polarization-maintaining coupler is based on the polarization characteristics of the light beams and the principles of reflection and transmission and is generally composed of a non-uniform medium with a special optical structure, so that the polarization separation of the incident light beams can occur when the incident light beams pass through, and the specific structure of the polarization-maintaining coupler is not excessively described in the embodiment.
The signal generating module and the polarization maintaining coupler are connected through an optical fiber, the signal generating module sends a first optical signal to the polarization maintaining coupler, the polarization maintaining coupler divides the first optical signal into a second optical signal and a third optical signal, the polarization maintaining coupler sends the second optical signal to the ranging module, the third optical signal to the circulator, the circulator is used for receiving the third optical signal and sending the third optical signal to the target object, when the third optical signal reaches the target object, the reflected light obtained is reflected back to the circulator, the circulator sends the reflected light to the ranging module, and the ranging module calculates the distance between the target object according to the frequencies of the reflected light and the second optical signal, wherein the related method for calculating the distance according to the frequencies of the reflected light and the second optical signal belongs to the prior art, and the method for calculating the distance according to the frequencies of the reflected light and the second optical signal is not excessively described in the embodiment.
According to the embodiment of the utility model, the signal generation module is arranged to emit the first optical signal, the polarization maintaining coupler is arranged to divide the first optical signal into the second optical signal and the third optical signal, the circulator is used to receive the third optical signal and send the third optical signal to the target object, the circulator also receives the reflected light of the third optical signal reflected by the target object and sends the reflected light to the ranging module, the ranging module converts the distance of the target object according to the frequency and the like of the second optical signal and the reflected light, the circulator is used to receive and emit the reflected light, excessive lenses are not required to be introduced, the size of the device is reduced, and errors are not easy to occur in the transmission of the reflected light.
First, in order to obtain a frequency-modulated signal and obtain an optical signal output according to the frequency-modulated signal, in a preferred embodiment, as shown in fig. 2, the signal generating module includes a signal generator and a distributed feedback laser, a signal receiving end of the distributed feedback laser is connected to the signal generator, a signal output end of the distributed feedback laser is connected to the polarization maintaining coupler, the signal generator is used for generating the frequency-modulated signal, and the distributed feedback laser is used for receiving the frequency-modulated signal and outputting a first optical signal to the polarization maintaining coupler.
Wherein the distributed feedback Laser is embedded with a distributed feedback structure, typically a periodically varying refractive index or bragg grating, in the Laser cavity, and the presence of this structure enables the distributed feedback Laser to produce a single frequency and narrow bandwidth Laser output, with a narrower spectral linewidth and a more stable output frequency than conventional FP (Fabry-Perot lasers).
The modulation and control of the optical signal can be realized by adjusting the output frequency and amplitude of the signal generator so as to control the optical frequency and power output by the distributed feedback laser, and the required first optical signal can be obtained.
In order to obtain more stable reflected light, it is generally necessary to amplify the incident light, i.e. the third optical signal, and then transmit the amplified optical signal, so in a preferred embodiment, the apparatus further includes an optical amplifier (as shown in fig. 5), where a signal receiving end of the optical amplifier is connected to the polarization maintaining coupler, so as to receive the third optical signal, and amplify and transmit the third optical signal to the circulator.
The optical amplifier is a device for amplifying an optical signal, and can increase the power of the optical signal without converting the optical signal into an electrical signal for amplification, and the working principle of the optical amplifier is that the amplification of the optical signal is realized through mechanisms such as injection energy level transfer or stimulated radiation, and the most common optical amplifier comprises an optical fiber amplifier and a semiconductor optical amplifier.
The optical fiber amplifier is to amplify the optical signal by using the dopants (such as erbium, ytterbium, etc.) in the optical fiber, and by injecting specific dopants into the optical fiber, the optical signal interacts with the dopants when passing through the optical fiber, so that the energy of the optical signal is amplified, and the optical fiber amplifier has the characteristics of high gain, wide bandwidth, low noise, etc., and is widely applied to optical fiber transmission and signal amplification in optical communication systems.
The semiconductor optical amplifier is a device manufactured based on semiconductor materials (such as InGaAsP, inP and the like), and is commonly provided with a semiconductor optical amplifier and a semiconductor optical amplifier array, and the semiconductor optical amplifier realizes the amplification of optical signals in a mode of current injection or optical injection and the like, has the characteristics of quick response, high gain and compactness, and is commonly used for signal amplification, modulation and the like in an optical communication system.
In this embodiment, the specific type of the optical amplifier is not specifically limited, and only the optical amplification needs to be implemented, and it is noted that the optical amplifier is also an existing optical amplification technology.
Next, the structure of the circulator will be briefly described, and in a preferred embodiment, as shown in fig. 3, a schematic structural diagram of the circulator includes a first port, where the first port is connected to a signal output end of the optical amplifier, the first port is used to receive the third optical signal amplified by the optical amplifier, and the polarization maintaining coupler is connected to the circulator through an optical fiber.
In a preferred embodiment, as shown in fig. 5, the device further comprises a collimator, and the circulator further comprises a second port, one end of the collimator is connected to the second port, the second port is used for sending the third optical signal to the collimator, the second port is further used for receiving the reflected light, and the collimator is used for collimating the third optical signal into a parallel beam.
The collimator uses an end face inclined by 8 degrees, and is coated with an antireflection film on the end face, so that reflection can be reduced, the collimator is used for converting the third optical signal into a parallel light beam or a nearly parallel light beam, and the collimator is usually composed of a lens or a lens system, and the curvature and the position of the lens are precisely designed to achieve the required collimation effect.
When the light beam passes through the collimator, the lens controls the divergence angle of the light beam to be in a smaller range, so that the light beam becomes almost parallel, and the defocusing effect of the light beam can be reduced, the light beam can be transmitted at a longer distance, further light beam focusing or projection is realized, and in an optical measuring system, the collimator is used for controlling the direction and the propagation characteristic of the light beam, so that the accuracy and the repeatability of measurement are ensured.
In a preferred embodiment, a collimator is further disposed on the optical path of the parallel light beam transmission, and the parallel light beam directly irradiates the target object after passing through the collimator.
The collimator is an optical element for converting a light beam into a parallel light beam or a nearly parallel light beam, similar to the collimator, but using specular reflection instead of refraction of a lens to achieve collimation of the light beam, and is generally composed of a plane mirror or a curved mirror, the mirror being precisely designed and polished to achieve a desired collimation effect, and the mirror controlling the divergence angle of the light beam to a smaller extent when the light beam passes through the collimator, so that the light beam becomes nearly parallel, and it is noted that the collimator and the collimator are designed according to the need, in this embodiment without being excessively limited.
After the parallel light beam irradiates the target object, the reflected light is obtained through reflection of the target object, and the reflected light passes through the collimating mirror and the collimator and is reflected back to the second port.
In a preferred embodiment, the circulator further comprises a third port connected to the ranging module, the third port being for transmitting reflected light received by the second port to the ranging module.
The circulator is an optical device based on light wave propagation in an annular waveguide, comprises three ports, is formed by an annular light waveguide and is commonly used in the fields of optical communication, optical sensing and the like, the circulator utilizes interference effect of the light wave in the annular waveguide to realize functions of filtering, modulating, enhancing and the like, when the light wave propagates in the annular waveguide, a resonance mode is formed inside the circulator, only light waves matched with resonance frequency can keep resonance in the circulator, light waves of other frequencies can be filtered or attenuated, selective enhancement or filtering of the light waves of specific frequencies can be realized by adjusting the geometric dimension and material parameters of the circulator, and the circulator can also realize modulation of the light waves and adjustment of interference effects by changing refractive index in the annular waveguide or through external electric or thermal control.
It should be noted that, in the prior art, the design and manufacturing of the circulator need to take into consideration factors such as loss, coupling efficiency and stability of the light wave, and the specific design and implementation of the circulator are not described in the embodiment.
In order to analyze the reflected light and the second light signal to obtain the distance information of the target object, in a preferred embodiment, as shown in fig. 4, the ranging module includes an integrated coherent receiver and an oscilloscope, the integrated coherent receiver is respectively connected with the polarization maintaining coupler and the third port, the oscilloscope is connected with the integrated coherent receiver, the integrated coherent receiver is used for receiving the second light signal and the reflected light and generating a beat signal, and the oscilloscope is used for performing fourier transform on the beat signal to extract the frequency spectrum information therein.
And the polarization maintaining coupler and the integrated coherent receiver and the third port and the integrated coherent receiver are connected through optical fibers to transmit optical signals.
The polarization maintaining optical fiber is used for guaranteeing the polarization direction of light, and improving the coherent signal to noise ratio so as to realize high-precision measurement of physical quantity.
The integrated coherent receiver is a special optical receiver capable of providing coherent detection and interference effects for measuring phase differences and interference characteristics of optical signals, is connected to a polarization maintaining coupler and a third port for receiving a second optical signal and reflected light and generating a beat signal, which is a frequency difference caused by the phase differences between the second optical signal and the reflected light, and can be used for measuring time delays or distances of the optical signals.
The oscilloscope is an instrument for measuring and displaying electric signals or optical signals, in the ranging module, the oscilloscope is connected with the integrated coherent receiver and is used for carrying out Fourier transform on beat signals, spectrum information is extracted from the signals, the Fourier transform can convert the signals from a time domain to a frequency domain, the beat signals are converted into the spectrum information so as to be further analyzed and processed, the ranging module can realize ranging and distance measurement of the optical signals by combining the integrated coherent receiver and the oscilloscope, and the distance of a target is deduced by analyzing the spectrum information of the beat signals so as to provide high-precision and high-resolution distance measurement capability, wherein the analysis and the processing of the second optical signals and reflected light all belong to the prior art, and are not excessively described in the embodiment.
As shown in fig. 5, a specific structural schematic diagram of a ranging device according to this embodiment is shown, the signal generating module is configured to send a first optical signal, the 50% polarization maintaining coupler is configured to divide the first optical signal into a second optical signal and a third optical signal, the third optical signal is received by using the circulator and is sent to a target object, the circulator also receives reflected light reflected by the third optical signal on the target object and sends the reflected light to the ranging module, the ranging module converts the distance of the target object according to the frequencies of the second optical signal and the reflected light, and the like, and the distributed feedback laser, the integrated coherent receiver and the optical amplifier in this embodiment are integrated into a chip, so that the structure designed by this scheme is simpler, the distance is calculated by the ranging module, and meanwhile, the measured distance can reach at least 100m, the measurement accuracy is 5cm, and the resolution is 12.66db when the distance is 100 m.
Example 2
In the embodiment 1, an FMCW lidar ranging device is provided, and in this embodiment, a method for performing ranging by the device is further described, as shown in fig. 6, including:
step 101: and controlling the signal generation module to transmit a first optical signal to the polarization maintaining coupler, wherein the polarization maintaining coupler divides the first optical signal into a second optical signal and a third optical signal.
The polarization maintaining coupler divides the first optical signal into two equal output light beams according to the polarization state of the first optical signal, namely a second optical signal and a third optical signal, and the frequencies, the intensities, the polarization states and the like of the second optical signal and the third optical signal are uniform.
Step 102: the circulator receives the third optical signal and transmits the third optical signal to a target object, and the target object reflects the third optical signal to obtain reflected light.
The third optical signal is amplified by the optical amplifier before entering the circulator, then enters the first port, and after the first port of the circulator receives the third optical signal, the third optical signal is sequentially transmitted to the collimator and the collimating mirror through the second port, then the third optical signal irradiates to a target object, and the target reflects the third optical signal to obtain reflected light.
Step 103: the circulator receives the reflected light and transmits the reflected light to the ranging module.
The reflected light returns through the original light path, sequentially passes through the collimating mirror and the collimator, then enters the second port, and exits through the third port according to the working principle of the circulator to reach the integrated coherent receiver in the ranging module.
Step 104: the distance measuring module receives the second optical signal and the reflected light, and analyzes and processes the second optical signal and the reflected light to obtain the distance of the target object.
The integrated coherent receiver in the ranging module receives the second optical signal and the reflected light, and is configured to perform coherent detection and interference effect on the two optical signals, measure a phase difference and interference characteristics of the two optical signals, generate a beat signal, and the oscilloscope receives the beat signal, performs fourier transform on the beat signal, extracts spectrum information from the beat signal, and obtains a distance of a target by analyzing the spectrum information of the beat signal.
The foregoing is a ranging method of an FMCW lidar ranging device, where the specific structural components of the ranging device are also referred to embodiment 1, and are not described in detail in this embodiment.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. An FMCW lidar range unit, comprising: the device comprises a signal generation module, a polarization maintaining coupler, a circulator and a ranging module;
the signal generation module is connected with the polarization maintaining coupler, the polarization maintaining coupler is respectively connected with the ranging module and the circulator, and the circulator is connected with the ranging module;
the signal generation module is used for generating a first optical signal and transmitting the first optical signal to the polarization maintaining coupler, and the polarization maintaining coupler is used for dividing the first optical signal into a second optical signal and a third optical signal;
the circulator is arranged on an optical path transmitted by the third optical signal, and is used for transmitting the third optical signal to a target object, and is also used for receiving reflected light obtained after the third optical signal is reflected by the target object;
the ranging module is used for receiving the second optical signal and the reflected light.
2. The FMCW lidar ranging device of claim 1, wherein the signal generation module includes a signal generator and a distributed feedback laser, a signal receiving end of the distributed feedback laser is connected to the signal generator, and a signal output end of the distributed feedback laser is connected to the polarization maintaining coupler;
the signal generator is used for generating a frequency modulation signal, and the distributed feedback laser is used for receiving the frequency modulation signal and outputting a first optical signal to the polarization maintaining coupler.
3. The FMCW lidar ranging device of claim 1, further comprising an optical amplifier, wherein a signal receiving end of the optical amplifier is connected to the polarization maintaining coupler for receiving the third optical signal and amplifying the third optical signal to the circulator.
4. A FMCW lidar ranging device according to claim 3, wherein the circulator comprises a first port connected to a signal output of the optical amplifier;
the first port is used for receiving the third optical signal amplified by the optical amplifier.
5. The FMCW lidar ranging device of claim 4, wherein the device further comprises a collimator, the circulator further comprises a second port, and one end of the collimator is connected to the second port;
the second port is used for sending the third optical signal to the collimator, and the second port is also used for receiving the reflected light;
the collimator is used for collimating the third optical signal into parallel light beams.
6. The FMCW lidar ranging device of claim 5, wherein a collimator is further provided on an optical path of the parallel beam transmission;
the parallel light beam is directly irradiated to the target object after passing through the collimating mirror.
7. The FMCW lidar ranging device of claim 6, wherein the reflected light is reflected back to the second port through the collimator mirror and the collimator.
8. The FMCW lidar ranging device of claim 7, wherein the circulator further comprises a third port;
the third port is connected with the ranging module and is used for transmitting the reflected light received by the second port to the ranging module.
9. The FMCW lidar ranging device of claim 8, wherein the ranging module includes an integrated coherent receiver and an oscilloscope, the integrated coherent receiver being connected to the polarization maintaining coupler and the third port, respectively, the oscilloscope being connected to the integrated coherent receiver;
the integrated coherent receiver is used for receiving the second optical signal and the reflected light and generating a beat signal;
the oscilloscope is used for carrying out Fourier transformation on the beat frequency signals so as to extract the frequency spectrum information in the beat frequency signals.
10. The FMCW lidar ranging device according to any of claims 1 to 9, wherein the signal generating module is connected to the polarization maintaining coupler, the polarization maintaining coupler is connected to the circulator, the polarization maintaining coupler is connected to the ranging module, and the circulator is connected to the ranging module by optical fibers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322198268.8U CN220626664U (en) | 2023-08-15 | 2023-08-15 | FMCW laser radar range unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322198268.8U CN220626664U (en) | 2023-08-15 | 2023-08-15 | FMCW laser radar range unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220626664U true CN220626664U (en) | 2024-03-19 |
Family
ID=90228033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322198268.8U Active CN220626664U (en) | 2023-08-15 | 2023-08-15 | FMCW laser radar range unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220626664U (en) |
-
2023
- 2023-08-15 CN CN202322198268.8U patent/CN220626664U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100362366C (en) | Apparatus and method for distance measurement using chaos laser of optical fiber laser device | |
| US5510890A (en) | Laser radar with reference beam storage | |
| CN102495411A (en) | Submillimeter-level linear tuning laser ranging system and signal processing method | |
| EP4089438A1 (en) | Time-of-interference light detection and ranging apparatus | |
| CN111796297B (en) | Parallel frequency modulation continuous wave laser ranging device based on erbium glass laser | |
| CN115210603B (en) | Laser radar and laser radar control method | |
| CN109239726B (en) | Non-cooperative target ranging system based on single double-comb femtosecond laser | |
| CN111983628B (en) | Speed and distance measuring system based on monolithic integrated linear frequency modulation dual-frequency DFB laser | |
| CN110567594A (en) | Precision laser wavelength measuring system | |
| CN109884655B (en) | Light-carrying frequency modulation continuous wave laser ranging system based on light injection semiconductor laser | |
| CN103337776B (en) | All-optical fiber type self-mixing distance measuring system of laser | |
| CN113534104A (en) | Frequency modulation continuous wave laser imaging system based on Fourier domain mode locking fiber laser | |
| CN220626664U (en) | FMCW laser radar range unit | |
| CN112526538A (en) | Frequency modulation continuous wave laser radar capturing system and method based on FDML | |
| CN111427025B (en) | Laser radar and ranging method of laser radar | |
| CN112130130A (en) | Silicon optical chip and laser radar system | |
| CN104914443B (en) | A kind of high-precision laser range-finding method of quick scanning | |
| CN114646941B (en) | Electrically-controlled pulse laser for coherent laser radar | |
| CN115854901A (en) | Distributed strain temperature sensing device and method based on chaotic laser Rayleigh scattering | |
| CN113960631B (en) | Radar system | |
| CN117214907A (en) | FMCW laser radar ranging device and ranging method | |
| CN215894939U (en) | Frequency modulation continuous wave laser imaging system based on Fourier domain mode locking fiber laser | |
| CN219370000U (en) | Optical path for eliminating echo interference of transmitting end face of FMCW optical fiber laser radar | |
| CN218782412U (en) | Space light coherent wind measurement system | |
| CN214704000U (en) | High-precision frequency modulation continuous wave laser radar system based on FDML technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |