CN214704000U - High-precision frequency modulation continuous wave laser radar system based on FDML technology - Google Patents
High-precision frequency modulation continuous wave laser radar system based on FDML technology Download PDFInfo
- Publication number
- CN214704000U CN214704000U CN202022837837.5U CN202022837837U CN214704000U CN 214704000 U CN214704000 U CN 214704000U CN 202022837837 U CN202022837837 U CN 202022837837U CN 214704000 U CN214704000 U CN 214704000U
- Authority
- CN
- China
- Prior art keywords
- laser
- fdml
- power distribution
- path
- frequency
- 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
Images
Abstract
The utility model relates to a laser radar technical field especially relates to a high accuracy frequency modulation continuous wave laser radar system based on FDML technique. The system comprises a light source module, a measuring module, a signal processing module and a data transmission module, wherein the light source module is used for emitting laser to a target to be measured based on the FDML technology; the measuring module is used for receiving the laser reflected by the target to be measured and obtaining an interference signal by adopting a coherent detection mode; the signal processing module is used for obtaining the distance and the speed of the target to be detected based on the interference signal; and the data transmission module is used for transmitting the obtained distance and speed of the target to be detected to the cloud. The technical problems of low resolution and low measurement precision of the conventional frequency modulation continuous wave laser distance measurement are solved.
Description
Technical Field
The utility model relates to a laser radar technical field especially relates to a high accuracy frequency modulation continuous wave laser radar system based on FDML technique.
Background
The laser radar ranging is one of the earliest fields of application of laser, and by means of the advantages of high precision, high resolution, long detection distance, strong anti-interference capability and the like, the measuring requirements in the fields of military, industrial measurement and the like are met, so that the laser radar ranging is widely applied.
Compared with the common laser pulse time-of-flight ranging and continuous wave amplitude modulation ranging technologies, the frequency-modulated continuous wave has very small distance resolution, can simultaneously measure two parameters of the speed and the distance of a target, and has the advantages of simple processing circuit, low power, compact structure, light weight and low power consumption.
Although there are many advantages to fm cw laser ranging, it has been limited by the modulation range and modulation linearity of the laser, which affects the laser measurement resolution and measurement accuracy.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
In view of the above-mentioned shortcoming, the deficiency of prior art, the utility model provides a high accuracy frequency modulation continuous wave lidar system based on FDML technique, it has solved the technical problem that current frequency modulation continuous wave laser rangefinder resolution ratio and measurement accuracy are low.
(II) technical scheme
In order to achieve the above object, the utility model discloses a main technical scheme include:
the embodiment of the utility model provides a high accuracy frequency modulation continuous wave laser radar system based on FDML technique, including light source module, measuring module, signal processing module and the data transmission module that connect gradually;
the light source module is used for emitting laser to a target to be measured based on the FDML technology;
the measuring module receives laser reflected by the target to be measured in a coherent detection mode and obtains an interference signal;
the signal processing module is used for obtaining the distance and the speed of the target to be detected based on the interference signal;
and the data transmission module is used for transmitting the obtained distance and speed of the target to be detected to the cloud.
The embodiment of the utility model provides a high accuracy frequency modulation continuous wave laser radar system based on FDML technique has realized that scanning speed is high based on FDML technique and coherent detection mode, and scanning range is wide, the instantaneous linewidth is narrow and the high sweep frequency laser output of phase stability, and the range finding precision that enables laser radar is higher, response time is faster, stability is better, has realized distance and the speed measurement of high accuracy.
Optionally, the light source module selects an FDML laser as a light source of the high-precision frequency modulation continuous wave laser radar system, and the FDML laser comprises a driving device, a continuous frequency modulation filter, a first isolator, a semiconductor optical amplifier, a second isolator, a dispersion compensation optical fiber and a first power distribution element which are connected in sequence;
the driving device is used for emitting sweep-frequency laser, and the sweep-frequency laser sequentially passes through the continuous frequency modulation filter, the first isolator, the semiconductor optical amplifier, the second isolator, the dispersion compensation optical fiber and the first power distribution element.
Optionally, the first power distribution element is configured to divide the swept-frequency laser into an a-path swept-frequency laser and a B-path swept-frequency laser, and a splitting ratio of the first power distribution element is 20: 80;
wherein, the A path of sweep frequency laser is used as the output of the FDML laser and outputs 20 percent of sweep frequency laser energy; the B-path swept laser returns to the ring resonator of the FDML laser, and 80% of swept laser energy is output.
Optionally, the time for one revolution of the swept laser to propagate in the ring resonator is an integer multiple of the period of the drive voltage of the chirped filter.
Optionally, the measurement module includes a second power distribution element, a third power distribution element, a circulator, a transceiver, a target to be measured, a fourth power distribution element, a first photodetector, a fifth power distribution element, a sixth power distribution element, and a second photodetector;
the second power distribution unit is connected with the third power distribution unit, the circulator, the transceiver and the target to be measured in sequence;
the fourth power distribution element device is connected with the first photoelectric detector in sequence;
the second power distribution element device is also sequentially connected with a sixth power distribution element device and a second photoelectric detector;
the second power distribution element is used for dividing the A-path sweep laser into a C-path sweep laser and a D-path sweep laser, and the splitting ratio of the second power distribution element is 50: 50;
wherein, the C-path sweep laser outputs 50% of sweep laser energy to the third power distribution element; the D-path sweep laser outputs 50% of sweep laser energy to the fifth power distribution element.
Optionally, the third power distribution element is configured to divide the C-path swept laser into a C1-path swept laser and a C2-path swept laser, and a splitting ratio of the third power distribution element is 50: 50;
the C1-path sweep laser enters the fourth power distribution element through the delay optical fiber; the C2-path sweep frequency laser is sequentially transmitted to a target to be detected through the circulator and the transceiver, the transceiver receives reflected laser reflected from the target to be detected, the reflected laser enters the fourth power distribution element after passing through the circulator and generates difference frequency interference with the C1-path sweep frequency laser to generate a first interference signal.
Optionally, the first photodetector is configured to convert the first interference signal into a first electrical signal by photoelectric conversion.
Optionally, the fifth power splitter is configured to split the D-path swept laser into a D1-path swept laser and a D2-path swept laser, and a splitting ratio of the fifth power splitter is 50: 50;
the D1-path sweep laser enters the sixth power distribution element through the delay optical fiber; the D2-path sweep laser enters the sixth power distribution element device through the single-mode fiber and generates difference frequency interference with the D1-path sweep laser to generate a second interference signal.
Optionally, the second photodetector is configured to convert the second interference signal into a second electrical signal by photoelectric conversion.
Optionally, the FPGA is configured to perform a difference between the first electrical signal and the second electrical signal to obtain a difference frequency signal dominant frequency, and obtain the distance and the speed of the target to be measured according to the difference frequency signal dominant frequency and by combining parameter information of the FDML laser.
(III) advantageous effects
The utility model has the advantages that: the utility model discloses a high accuracy frequency modulation continuous wave laser radar system based on FDML technique, because adopt the FDML laser instrument as the sweep frequency light source of laser radar system, the laser instrument works in the quasi-steady state, this FDML technique has overcome current sweep frequency light source at output, the restriction in aspects such as sweep frequency speed and spectral line width, it is high to have realized scanning speed, the scanning range is wide, the sweep frequency laser output that instantaneous linewidth is narrow and phase stability is high, it is higher to enable laser radar's range finding precision, response time is faster, stability is better, distance and the speed measurement of high accuracy have been realized, the simple structure of system is compact simultaneously, the space is practiced thrift.
Drawings
Fig. 1 is a block diagram of a high-precision frequency modulated continuous wave lidar system based on the FDML technology;
fig. 2 is the utility model provides a high accuracy frequency modulation continuous wave lidar system's based on FDML technique structural schematic.
[ description of reference ]
1: a drive device; 2: a continuous frequency modulation filter; 3: a first isolator; 4: a semiconductor optical amplifier; 5: a second isolator; 6: a dispersion compensating fiber; 7: a first power distribution element; 8: a second power distribution element; 9: a third power distribution element; 10: a circulator; 11: a transceiver device; 12: a target to be measured; 13: a fourth power distribution element; 14: a first photodetector; 15: a fifth power distribution element; 16: a sixth power distribution element; 17: a second photodetector; 18: a field programmable gate array; 19: and (4) a computer.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.
The embodiment of the utility model provides a high accuracy frequency modulation continuous wave laser radar system based on FDML (Fourier domain mode locking) technique, because adopt the FDML laser instrument as the sweep frequency light source of laser radar system, the laser instrument work is at the quasi-steady state, this FDML technique has overcome current sweep frequency light source at output, the restriction in the aspect of sweep frequency speed and spectral line width, it is high to have realized the scanning speed, the scanning range is wide, the sweep frequency laser output that instantaneous linewidth is narrow and phase stability is high, it is higher to enable laser radar's range finding precision, response time is faster, stability is better, distance and the speed measurement of high accuracy have been realized, system simple structure is compact simultaneously, practice thrift the space.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
The embodiment provides a high-precision frequency modulation continuous wave laser radar system based on an FDML (frequency division multiple ml) technology, which comprises a light source module, a measuring module, a signal processing module and a data transmission module which are sequentially connected as shown in FIG. 1. The light source module realizes high-speed and stable sweep frequency light source output based on a mode locking technology and emits laser to a target to be detected; the measurement module adopts a coherent detection mode, utilizes optical fibers as a transmission and receiving light path of laser, receives the laser reflected by the target to be measured and obtains an interference signal; the signal processing module obtains the distance and the speed of the target to be detected based on the interference signal; and the data transmission module is used for transmitting the obtained distance and speed of the target to be detected to the cloud.
As shown in fig. 2, the light source module selects an FDML laser as the light source of the high-precision frequency modulation continuous wave lidar system, and the FDML laser includes a driving device 1, a continuous frequency modulation filter 2, a first isolator 3, a semiconductor optical amplifier 4, a second isolator 5, a dispersion compensation fiber 6, and a first power distribution element 7, which are connected in sequence. The continuous frequency modulation filter 2 is controlled to be opened and closed by the driving device 1, the typical working wavelength of the continuous frequency modulation filter 2 is 1550nm, the tuning voltage range is-20-50V, and the free spectrum range is 50-60 nm. Specifically, the swept-frequency laser is emitted under the control of the driving device 1, and passes through the continuous frequency modulation filter 2, the first isolator 3, the semiconductor optical amplifier 4, the second isolator 5, the dispersion compensation fiber 6 and the first power distribution element 7 in sequence, and is divided into a path of swept-frequency laser and a path of swept-frequency laser after passing through the first power distribution element 7, wherein the splitting ratio of the first power distribution element 7 is 20: 80, wherein the A-path swept laser is used as the output of the FDML laser to output 20% of swept laser energy; the B path of sweep laser returns to the annular resonant cavity of the FDML laser, and one path of sweep laser circulates to output 80% of sweep laser energy.
Further, the difference between the FDML laser and the conventional laser is that the dispersion compensation fiber 6 is used for dispersion management, and the period of the driving voltage of the continuous frequency modulation filter 2 of the narrow-band optics is matched with the time of one-circle propagation of the swept-frequency laser in the ring resonator, that is, the former two times are equal or the latter is an integral multiple of the former. Thus, a quasi-steady-state mode is generated, the period of the driving voltage of the continuous frequency modulation filter 2 is equal to the time that the sweep-frequency laser transmits a circle around the ring-shaped resonant cavity, so that when the sweep-frequency laser with a certain frequency or wavelength passes through the continuous frequency modulation filter 2 and transmits a circle in the ring-shaped resonant cavity and then returns to the continuous frequency modulation filter 2 again, the cavity length of the continuous frequency modulation filter 2 is just tuned to the fact that the sweep-frequency laser can pass through, therefore, the sweep-frequency laser of the previous loop period is coupled back to the gain medium, the establishment of the sweep-frequency laser does not need to depend on the spontaneous radiation of the gain medium any more, each longitudinal mode is accurately locked, and continuous sweep-frequency laser output is achieved.
The measuring module comprises a second power distribution element device 8, a third power distribution element device 9, a circulator 10, a transceiver 11, a target 12 to be measured, a fourth power distribution element device 13, a first photoelectric detector 14, a fifth power distribution element device 15, a sixth power distribution element device 16 and a second photoelectric detector 17. The second power distribution unit 8 is sequentially connected with the third power distribution unit 9, the circulator 10, the transceiver 11 and the target 12 to be measured, the fourth power distribution unit 13 is sequentially connected with the first photoelectric detector 14, and the second power distribution unit 8 is further sequentially connected with the sixth power distribution unit 16 and the second photoelectric detector 17.
The A path of sweep laser is divided into C path of sweep laser and D path of sweep laser after passing through the second power distribution element 8, and the splitting ratio of the second power distribution element 8 is 50: and 50, wherein the C-path sweep laser outputs 50% of sweep laser energy, and the D-path sweep laser outputs 50% of sweep laser energy.
The C-path swept laser is divided into C1-path swept laser and C2-path swept laser after passing through the third power distribution element 9, and the splitting ratio of the third power distribution element 9 is 50: 50, wherein the C1-path sweep laser enters the fourth power distribution element 13 through the delay fiber, the C2-path sweep laser is sequentially transmitted to the target 12 to be detected through the circulator 10 and the transceiver 11, the transceiver 11 receives the reflected laser reflected from the target 12 to be detected, the reflected laser enters the fourth power distribution element 13 after passing through the circulator 10, and undergoes difference frequency interference with the C1-path sweep laser to generate a first interference signal (i.e., a first optical output signal), the first interference signal is received by the first photodetector 14, and the first photodetector 14 converts the first interference signal into a first electrical signal through photoelectric conversion.
The D path of the swept laser passes through the fifth power distribution element 15 and is divided into D1 path of the swept laser and D2 path of the swept laser, and the splitting ratio of the fifth power distribution element 15 is 50: 50, the D1-path swept laser enters the sixth power distribution element 16 through the delay fiber, the D2-path swept laser enters the sixth power distribution element 16 through the common single-mode fiber, and performs difference frequency interference with the D1-path swept laser to generate a second interference signal (i.e., a second optical output signal), the second interference signal is received by the second photodetector 17, and the second photodetector 17 converts the second interference signal into a second electrical signal through photoelectric conversion.
Furthermore, the C-path frequency-sweeping laser and the D-path frequency-sweeping laser form a double interference light path, two beams of laser are emitted by the same light source, the C-path frequency-sweeping laser serves as a measurement interference light path, the D-path frequency-sweeping laser serves as a Mach-Zehnder interference light path and serves as an auxiliary interference light path, the delay fiber is used for increasing an optical path, equal-frequency resampling is carried out on the second interference signal, the influence of modulation nonlinearity of the FDML laser can be effectively eliminated, and the noise reduction effect is achieved.
Measuring intensity I of output first interference signal of interference light path (C path sweep laser)m(f) Comprises the following steps:
Im(f)＝Am cos(2πfτm)＝Am cos(2π(f0+Δf)τm)
in the formula, AmIs the amplitude of the first interference signal, f is the instantaneous frequency of the FDML laser, f0Is the initial frequency of the FDML laser, Δ f is the difference frequency, τ, of the FDML lasermIs the delay of the first interference signal.
Intensity I of output second interference signal of auxiliary interference optical path (D-path swept laser)a(f) Comprises the following steps:
Ia(f)＝Aa cos(2πfτa)＝Aa cos(2π(f0+Δf)τa)
in the formula, AaIs the amplitude, tau, of the second interference signalaIs the delay of the second interference signal.
Order:
2πΔf(n)τa＝πn
where N is a positive integer, N is 1,2,3, N is the number of the extreme points of the second interference signal, Δ f (N) is the time difference frequency of the pole of the nth interference signal, and Δ f (N) is N/2 τaThen, the intensity of the output first interference signal can be simplified to im (n):
Im(n)＝Am cos(2πf0τm+πnτm/τa)
the signal processing module includes a Field Programmable Gate Array (FPGA)18 and a computer 19. The field programmable gate array 18 receives the first electrical signal of the first photodetector 14 and the second electrical signal of the second photodetector 17, processes the first electrical signal and the second electrical signal to obtain the distance and the speed of the object 12 to be measured, and stores the distance and the speed of the object 12 to be measured in the computer 19.
Further, the field programmable gate array is used for subtracting the first electrical signal from the second electrical signal to obtain a difference frequency signal main frequency, and according to the difference frequency signal main frequency and in combination with parameter information of the FDML laser, obtaining a distance R and a speed V of the target to be detected:
wherein B is the modulation range of the FDML laser, T is the sweep frequency period of the FDML laser, and FDThe main frequency of the difference frequency signal of the first electric signal and the second electric signal, c is the vacuum wave velocity, and lambda is the selected wavelength.
Further, the simple calculation distance R' of the target 12 to be measured obtained by performing fast fourier transform on the distance R is:
in the formula, nfiberIs the refractive index of the laser in the fiber, nairRefractive index of laser in air, RaT is the sweep period of the FDML laser, and N is the number of extreme points of the second interference signal.
In conclusion, the utility model provides a high accuracy frequency modulation continuous wave laser radar system based on FDML technique utilizes FDML mode locking sweep frequency laser source, combines together it and frequency modulation continuous wave range finding method for the first time, can realize distance and the velocity measurement of high accuracy simultaneously to the object that awaits measuring, and system structure is simple and compact simultaneously.
The light source module adopts an FDML frequency-swept laser, and high-speed and stable frequency-swept light source output is realized based on a mode locking technology. Compared with a light source selected by a traditional distance measuring system, the mode locking technology adopted by the FDML overcomes the limitations of the existing sweep frequency light source in the aspects of scanning speed, sweep frequency range, spectral line width and the like, and realizes more high-speed and stable sweep frequency laser output.
The measuring module adopts interference to reduce noise, and through introducing the auxiliary interference light path, carries out equal-frequency resampling on the measurement interference light path, can eliminate the nonlinear influence of laser modulation effectively, plays the effect of making an uproar, and with low costs, effectual, has the advantage that reduces data calculation volume to the promotion system precision. The transmitting part and the receiving part adopt an all-fiber design, have the advantages of small volume, light weight, electromagnetic interference resistance and the like, and have wide use scenes.
The utility model provides a high accuracy frequency modulation continuous wave laser radar system specially adapted remote, the object distance and the speed test of high accuracy based on FDML technique.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the terms first, second, third and the like are for convenience only and do not denote any order. These words are to be understood as part of the name of the component.
Furthermore, it should be noted that in the description of the present specification, the description of the term "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the claims should be construed to include preferred embodiments and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention should also be covered thereby.
Claims (10)
1. A high-precision frequency modulation continuous wave laser radar system based on an FDML technology is characterized by comprising a light source module, a measuring module, a signal processing module and a data transmission module which are sequentially connected;
the light source module is used for emitting laser to a target to be measured based on the FDML technology;
the measuring module receives laser reflected by the target to be measured in a coherent detection mode and obtains an interference signal;
the signal processing module is used for obtaining the distance and the speed of the target to be detected based on the interference signal;
and the data transmission module is used for transmitting the obtained distance and speed of the target to be detected to the cloud.
2. The FDML-based high-precision frequency modulated continuous wave lidar system of claim 1, wherein the light source module selects an FDML laser as the light source of the high-precision frequency modulated continuous wave lidar system, and the FDML laser comprises a driving device (1), a continuous frequency modulation filter (2), a first isolator (3), a semiconductor optical amplifier (4), a second isolator (5), a dispersion compensation fiber (6) and a first power distribution element (7) which are connected in sequence;
the driving device (1) is used for emitting sweep laser, and the sweep laser sequentially passes through the continuous frequency modulation filter (2), the first isolator (3), the semiconductor optical amplifier (4), the second isolator (5), the dispersion compensation optical fiber (6) and the first power distribution element (7).
3. A FDML technology based high precision frequency modulated continuous wave lidar system according to claim 2, wherein the first power splitter (7) is configured to split the swept laser into a-path swept laser and B-path swept laser, and wherein the splitting ratio of the first power splitter (7) is 20: 80;
wherein, the A path of sweep frequency laser is used as the output of the FDML laser and outputs 20 percent of sweep frequency laser energy; the B-path swept laser returns to the ring resonator of the FDML laser, and 80% of swept laser energy is output.
4. A high precision frequency modulated continuous wave lidar system based on FDML technology as defined in claim 3 wherein the time of one revolution of the swept laser light propagating within the ring resonator is an integer multiple of the period of the drive voltage of the continuous frequency modulated filter (2).
5. The FDML based high precision frequency modulated continuous wave lidar system of claim 3 wherein the measurement module comprises a second power splitter (8), a third power splitter (9), a circulator (10), a transceiver (11), a target under test (12), a fourth power splitter (13), a first photodetector (14), a fifth power splitter (15), a sixth power splitter (16), and a second photodetector (17);
the second power distribution unit (8) is sequentially connected with the third power distribution unit (9), the circulator (10), the transceiver (11) and the target to be measured (12);
the fourth power distribution element (13) is connected with the first photoelectric detector (14) in sequence;
the second power distribution element device (8) is also sequentially connected with a sixth power distribution element device (16) and a second photoelectric detector (17);
the second power distribution element device (8) is used for dividing the A-path sweep laser into a C-path sweep laser and a D-path sweep laser, and the splitting ratio of the second power distribution element device (8) is 50: 50;
wherein, the C-path sweep laser outputs 50% sweep laser energy to the third power distribution element device (9); the D-path sweep laser outputs 50% of sweep laser energy to a fifth power distribution element device (15).
6. A high-precision frequency-modulated continuous wave lidar system according to claim 5, characterized in that the third power splitter (9) is configured to split the C-channel swept laser into C1-channel swept laser and C2-channel swept laser, and the splitting ratio of the third power splitter (9) is 50: 50;
wherein, the C1-path sweep laser enters a fourth power distribution element device (13) through a delay optical fiber; the C2 frequency-sweeping laser is transmitted to a target to be measured (12) sequentially through the circulator (10) and the transceiver (11), the transceiver (11) receives reflected laser reflected from the target to be measured (12), the reflected laser enters the fourth power distribution element (13) after passing through the circulator (10) and generates difference frequency interference with the C1 frequency-sweeping laser, and a first interference signal is generated.
7. A high accuracy frequency modulated continuous wave lidar system based on FDML technology as defined in claim 6 wherein the first photodetector (14) is adapted to convert the first interference signal to a first electrical signal by opto-electrical conversion.
8. A FDML technology based high precision frequency modulated continuous wave lidar system according to claim 5 wherein the fifth power splitter (15) is configured to split the D-path swept laser into D1-path swept laser and D2-path swept laser, and wherein the splitting ratio of the fifth power splitter (15) is 50: 50;
wherein, the D1 path sweep laser enters the sixth power distribution element device (16) through the time delay optical fiber; the D2-path swept laser enters a sixth power distribution element device (16) through the single mode fiber, and generates difference frequency interference with the D1-path swept laser to generate a second interference signal.
9. A high precision frequency modulated continuous wave lidar system based on FDML technology as defined in claim 8 wherein the second photodetector (17) is adapted to convert the second interference signal to a second electrical signal by optical to electrical conversion.
10. The FDML-technology-based high-precision frequency modulated continuous wave lidar system of claim 9, wherein the FPGA (18) is configured to perform a difference between the first electrical signal and the second electrical signal to obtain a difference frequency signal dominant frequency, and obtain a distance and a speed of the target (12) to be measured according to the difference frequency signal dominant frequency and by combining parameter information of the FDML laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022837837.5U CN214704000U (en) | 2020-11-30 | 2020-11-30 | High-precision frequency modulation continuous wave laser radar system based on FDML technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022837837.5U CN214704000U (en) | 2020-11-30 | 2020-11-30 | High-precision frequency modulation continuous wave laser radar system based on FDML technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214704000U true CN214704000U (en) | 2021-11-12 |
Family
ID=78557041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022837837.5U Active CN214704000U (en) | 2020-11-30 | 2020-11-30 | High-precision frequency modulation continuous wave laser radar system based on FDML technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214704000U (en) |
-
2020
- 2020-11-30 CN CN202022837837.5U patent/CN214704000U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106226778A (en) | A kind of coherent lidar system of high resolution measurement remote object | |
| CN111693988A (en) | Laser millimeter wave integrated distance and speed measuring radar method and device | |
| CN206114903U (en) | High resolution measures coherent laser radar system of long -range target | |
| Piracha et al. | Simultaneous ranging and velocimetry of fast moving targets using oppositely chirped pulses from a mode-locked laser | |
| CN111337902A (en) | Multi-channel high-repetition-frequency large-dynamic-range distance and speed measuring laser radar method and device | |
| CN1844951A (en) | Apparatus and method for distance measurement using chaos laser of optical fiber laser device | |
| CN110133616B (en) | Laser radar system | |
| CN111175780A (en) | Injection locking frequency modulation continuous wave laser radar speed measuring device and method | |
| CN112799090B (en) | Frequency reuse solid-state laser radar detection method and system | |
| CN104914444A (en) | Long-distance laser heterodyne interference range-finding structure | |
| CN112526538A (en) | Frequency modulation continuous wave laser radar capturing system and method based on FDML | |
| CN112129491A (en) | Optical fiber time delay measuring method and device based on single-optical-frequency comb interference | |
| CN111796297B (en) | Parallel frequency modulation continuous wave laser ranging device based on erbium glass laser | |
| CN115407351A (en) | Interferometric time light detection and ranging system and method and device for determining object distance | |
| Wu et al. | Narrow linewidth external cavity laser capable of high repetition frequency tuning for FMCW LiDAR | |
| Billault et al. | All-optical coherent pulse compression for dynamic laser ranging using an acousto-optic dual comb | |
| CN113534104A (en) | Frequency modulation continuous wave laser imaging system based on Fourier domain mode locking fiber laser | |
| CN211825682U (en) | Optical domain frequency sweeping device based on FP cavity interferometer | |
| Yang et al. | A novel hybrid TOF/phase-shift method for absolute distance measurement using a falling-edge RF-modulated pulsed laser | |
| CN115685231B (en) | Frequency modulation laser radar system and method for improving coherent detection distance | |
| CN214704000U (en) | High-precision frequency modulation continuous wave laser radar system based on FDML technology | |
| CN116930995A (en) | System and method for measuring speed and distance of high-speed target of frequency modulation continuous wave laser | |
| CN109239731B (en) | Device and method for realizing detection and amplification of spatial weak signal based on spontaneous Brillouin scattering | |
| Peng et al. | Robust wide-range chirp rate measurement based on a flexible photonic fractional Fourier transformer | |
| Hou et al. | Method of high-precision spatial distance measurement based on optical-carried microwave interference |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |