CN100478703C - Chaos laser range-measurement method and device based on semiconductor laser - Google Patents
Chaos laser range-measurement method and device based on semiconductor laser Download PDFInfo
- Publication number
- CN100478703C CN100478703C CNB2006100126240A CN200610012624A CN100478703C CN 100478703 C CN100478703 C CN 100478703C CN B2006100126240 A CNB2006100126240 A CN B2006100126240A CN 200610012624 A CN200610012624 A CN 200610012624A CN 100478703 C CN100478703 C CN 100478703C
- Authority
- CN
- China
- Prior art keywords
- light
- laser
- semiconductor laser
- signal
- chaos
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Optical Radar Systems And Details Thereof (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
A method of using chaos laser to measure distance based on semiconductor laser includes modulating output character of semiconductor laser to make it emit chaos laser signal then splitting chaos laser signal to be reference light and detection light, using detection light to illuminate object to be measured carrying out correlative comparison of scattered back chaos detection light with chaos reference light, applying cross correlation manner to measure round - trip time of chaos detection light. The device for realizing said method is also disclosed.
Description
Technical field
The invention belongs to laser distance measurement method and device field, particularly a kind of semiconductor laser that utilizes produces method and device thereof that the chaotic laser light signal is realized laser ranging, can be applicable to numerous areas such as industrial and agricultural production, military affairs, communication, remote sensing.
Background technology
Laser ranging is to utilize laser signal to carry out the method for range observation.In the existing medium-long range laser distance measuring system,, mainly contain when surveying, survey phase, three kinds of methods of frequency measurement according to the classification of the extracting mode of range information.
Formerly technology [1] is (referring to Raimo Ahola, Risto Myllyla, A new method formeasuring the time-of-flight in fast laser range finding, [J] .Proc.SPIEvol.654,1986) be a kind of method of utilizing the light pulse flight time.The laser pulse signal that the pulsed laser emission duration is very short is transmitted into target back reflection to be measured and returns, and echoed signal is received by photodetector after returning stadimeter, measures the two-way time of laser pulse, gets final product computed range.Measuring accuracy depends on the response time of the width and the photoelectric device of light pulse greatly about several meters to several meters of zero points.Measurement range depends primarily on the energy of laser pulse and the loss of laser signal in working environment, when long range measurements, requires powerful solid (or gas) laser instrument usually.But the use of these high power lasers must bring volume big, when cost height, operating cost and shortcoming such as difficult in maintenance.This method is except that needing the high laser instrument of performance, also need complicated processing of circuit system, to be electric pulse with the Conversion of energy of part light pulse at first, shaping after the gating circuit flip-flop number begin the time pulse that clock oscillator sends is counted.The echoed signal of returning is converted into electric signal once more through detector, handles the counting that stops time pulse signal through same electricity, is determined the two-way time of laser pulse by the number of time pulse signal.
Formerly technology [2] is (referring to Fujima I, Seta K, Matsumoto H and O ' ishi T 1988GHz traveling-wave optical modulator for precision distance measurementProc.SPIE vol 889) is a kind of distance-finding method that utilizes the continuous laser phase information, realizes range finding by measuring the high frequency modulated phase differential.The lightwave signal of laser instrument output is carried out the sinusoidal intensity modulation by modulator, the lightwave signal that target reflection to be measured returns comprises sinusoidal intensity modulation composition equally, but phase place has a time delay, and this time delay and light are directly proportional with two-way time between the target to be measured at laser instrument.By analyzing the cross correlation function of a reflected light signal and a fixed reference light signal, thereby calculate the distance of target to be measured, its distance accuracy is determined by the bandwidth of sinusoidal modulation signal.
Continuous laser modulation mensuration also can be modulated the continuous laser signal with pseudo-noise code generator, and its measuring accuracy depends primarily on code rate.A shortcoming of pseudo-random code is to produce limited code length, and the overlapping meeting between the adjacent code simultaneously causes the two-value of measurement result, and code length is long more, and the possibility of measurement result generation two-value is just more little in certain measurement range.No matter be Sine Modulated or pseudo-random code modulation, need that all light signal is converted into electric signal and handle that be subjected to the restriction of code rate or modulation rate simultaneously, its measuring accuracy is lower usually, is about several meters through Circuits System.Adopt accurate external modulator (as electrooptical crystal modulator) can improve modulation rate or code rate, but cost can improve greatly again.
Formerly technology [3] is (referring to S F Collins, M M Murphy, K T V Grattan, etal.Asimple laser diode ranging scheme using an intensity modulated FMCWapproach[J] .Meas.and Tech, .1993,4) be a kind of distance-finding method that utilizes the continuous laser frequency information, principle is by launching the continuously adjustable laser signal of a frequency, the echoed signal of returning after target to be measured is compared with transmitting, there is frequency drift owing to warbling, so will produce beat frequency in frequency mixer, this beat frequency is directly proportional with testing distance.This method is converted into electric signal except that needing through Circuits System is handled with light signal, also needs to increase the additional circuitry of regulating laser frequency.
Pulsed laser signal used in chaotic laser light signal range finding and the above-mentioned laser ranging is compared with continuous modulated laser signal, and the chaotic laser light signal has characteristics such as broadband, waveform unpredictability and correlativity are good, is desirable distance measuring signal.The application of RANDOM SIGNAL RADAR and chaos signal radar has tentatively demonstrated the advantage of chaotic signal at aspects such as measuring accuracy, antijamming capabilities.The chaotic signal that is used for radar range finding is at present produced by non-linear circuit, and the difficulty of its maximum is that electron device is difficult to produce the chaotic signal in broadband, can't bring into play the advantage of chaotic signal aspect range finding fully.
Summary of the invention
The problem to be solved in the present invention is to utilize the chaotic laser light signal to replace used distance measuring signal in the prior art, overcomes the deficiency that must take the complicated circuit design in the prior art in order to improve measuring accuracy.Its objective is provides a kind of chaotic laser light signal that utilizes semiconductor laser to produce to realize the method and the device of laser ranging.
The invention provides a kind of method of chaos laser range-measurement of based semiconductor laser instrument, this method is based on the nonlinear characteristic of semiconductor laser, utilizes semiconductor laser emission higher-dimension chaotic laser light signal; The chaotic laser light signal that semiconductor laser is produced is divided into two bundles, and a branch of conduct is with reference to light, and another Shu Zuowei surveys light, surveys illumination and is mapped to target to be measured, compares through back scattered chaos detection light of target surface to be measured and chaos reference light; Utilize cross-correlation method to measure chaos and survey light at the turnaround time of free space τ, then the distance of target to be measured can be utilized formula
Calculate, wherein c represents the aerial velocity of propagation of light.
Be used to the present invention is based on the device of the chaos laser range-measurement method of semiconductor laser, its device is as LASER Light Source with semiconductor laser, its output light is transferred to outer light feedback element by Polarization Controller and fiber coupler successively, light through outer light feedback element feedback returns along former road, refill semiconductor laser, the output characteristics of semiconductor laser modulation, adjusting by external light feedback element and Polarization Controller changes feedback light intensity and polarization state, makes semiconductor laser produce the chaotic laser light signal of higher-dimension;
After the chaotic laser light signal that semiconductor laser sends passes through a fibre optic isolater, be divided into two bundles by another fiber coupler, survey light I and reference light II, survey light I as distance measuring signal, amplify the back by collimating the transmitting mirror emission and shining target to be measured through image intensifer, after being surveyed light and received by astronomical telescope by the chaos of target surface scattering to be measured, amplify and be converted into electric signal input simple crosscorrelation instrument with photodetector through image intensifer as echoed signal.Reference light II is converted to electric signal input simple crosscorrelation instrument by photodetector after fibre delay line postpones calibration; The simple crosscorrelation instrument compares reference light II and detection light I as the signal analysis and processing device, measures and surveys light at the turnaround time of free space τ, calculates testing distance.
The chaos laser range-measurement method and the device of the based semiconductor laser instrument that the present invention proposes relatively have the following advantages with existing laser distance measurement method and device:
1. first technology [1], [2], [3] have utilized the pulse characteristic, phase information, frequency information of the laser carrier as range information respectively, and the present invention has utilized the chaotic characteristic of laser to realize laser ranging as information carrier first.
2. the chaotic laser light signal has characteristics such as broadband, waveform unpredictability and correlativity are good, has the measuring accuracy height as distance measuring signal, and the advantage that antijamming capability is strong is desirable distance measuring signal.The chaotic laser light signal also has the unduplicated characteristics of waveform, and therefore, the measurement result two-value problem that first technology [2] produces owing to code length is too short in continuous light pseudo-random code modulation also can Lock-out, realizes not having bluring and finds range.
3. the existing chaotic signal that is used to find range is produced by non-linear circuit, and the difficulty of its maximum is that electron device is difficult to produce the chaotic signal in broadband, can't bring into play the advantage of chaotic signal aspect range finding fully.Semiconductor laser can produce chaotic laser light under the situation that has the light feedback, this chaotic laser light signal has smooth continuous frequency spectrum, its bandwidth can reach tens GHz, thereby have the distance and the speed resolution characteristic of height, be applied to find range and can utilize measurement mechanism simple in structure to reach cm-level accuracy easily.
4. utilize a simple outer light feedback element to change the light intensity of feedback light in the distance measuring equipment, make semiconductor laser produce chaotic laser light, simple in structure, do not have machinery and adjust requirement, be fit to the rugged surroundings requirement.With continuous light pseudo-random code modulation phase ratio in the first technology [2], expensive external modulator and power supply have been save.And utilize various image intensifers can be easy to the chaotic laser light signal that semiconductor laser produces is amplified, realize range finding at a distance.
Description of drawings
Fig. 1 is based on the system schematic of the chaos laser range-measurement method and the device of semiconductor laser
Among the figure: 1: semiconductor laser 2: Polarization Controller 3,6:1x2 fiber coupler 4: outer light feedback element 5: fibre optic isolater 7: fibre delay line 8,12: image intensifer 9: collimation transmitting mirror 10: target 11 to be measured: astronomical telescope 13,14: photodetector 15: simple crosscorrelation instrument
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
This method embodiment can utilize the output characteristics of the outer optical feedback effect semiconductor laser modulation 1 of semiconductor laser 1 to produce the chaotic laser light signal.To export light with outer light feedback element and feed back to semiconductor laser 1, make semiconductor laser 1 emission higher-dimension chaotic laser light signal by adjusting to feedback light intensity size.The chaotic laser light signal that semiconductor laser 1 is produced is divided into two bundles, and a branch of conduct is with reference to light, and another Shu Zuowei surveys light, surveys illumination and is mapped to target 10 to be measured, and the chaos detection light and the chaos reference light that return through target 10 surface scatterings to be measured compare.By comparison to the two-beam cross correlation function, to measure chaos and survey light at the turnaround time of free space τ, the distance of target 10 then to be measured can be utilized formula
Calculate, wherein c represents the aerial velocity of propagation of light.
The chaotic laser light signal generation device is by semiconductor laser 1 among this device embodiment, Polarization Controller 2, and fiber coupler 3 and outer light feedback element 4 are formed jointly.Adopt wavelength be the dfb semiconductor laser instrument 1 of 1.55 μ m as light source because the laser of 1.55 mum wavelengths is the highest to the security of human eye, and atmospheric attenuation is little, the target reflection factor height.Outer light feedback element 4 can utilize the digital tunable mirror that can control automatically to realize.Behind output light process Polarization Controller 2 and the fiber coupler 3, be transferred to digital tunable mirror 4, feedback light is returned along former road, injects semiconductor laser 1 again, changes the output state of laser instrument.Change feedback light intensity and polarization state by size and the adjusting Polarization Controller 2 that digital tunable mirror 4 reflectivity are set, make the chaotic laser light signal of semiconductor laser 1 output higher-dimension.
In order to prevent that unnecessary feedback light is injected in the semiconductor laser 1, the chaotic laser light signal of being exported by fiber coupler 3 at first needs through a fibre optic isolater 5, is I light and II light by 6 beam splitting of 1x2 fiber coupler again.I light is transferred to target 10 to be measured by image intensifer 8 and collimation transmitting mirror 9 successively as surveying light.Image intensifer 8 can adopt Erbium-Doped Fiber Amplifier (EDFA), and collimation transmitting mirror 9 directly adopts the collimation lens of common material to get final product.Received by reflective astronomical telescope 11 through the echoed signal of target 10 scatterings to be measured, the chaos echoed signal that receives is through transmission at a distance, inevitably has various losses and weakens.So also need amplify, be transferred to simple crosscorrelation instrument 15 after being converted into electric signal by photodetector 13 again through another image intensifer 12.Image intensifer 8 described in the device can adopt identical Erbium-Doped Fiber Amplifier (EDFA) with 12.II light is as reference light, after postponing through fibre delay line 7, is transferred to simple crosscorrelation instrument 15 after being converted into electric signal by photodetector 14.Transmission time t when the control lag line makes I light from fiber coupler 6 output to 9 outputs of collimation transmitting mirror
1, the transmission time t when beginning to injection simple crosscorrelation instrument 13 from astronomical telescope 11 receptions
2, from the II light of the fiber coupler 6 output transmission time t when injecting simple crosscorrelation instrument 13
3, satisfy relation: t
1+ t
2=t
3Utilize simple crosscorrelation instrument 15 to measure the time delay of I light and II light, promptly I light calculates testing distance at the turnaround time of free space τ.
Claims (2)
1. the chaos laser range-measurement method of based semiconductor laser instrument, this method is based on the nonlinear characteristic of semiconductor laser (1), utilize feedback effect to change the output characteristics of semiconductor laser (1), make semiconductor laser (1) emission higher-dimension chaotic laser light signal; The chaotic laser light signal that semiconductor laser (1) is produced is divided into two bundles, a branch of conduct is with reference to light, another Shu Zuowei surveys light, surveys illumination and is mapped to target to be measured (10), and the chaos detection light and the chaos reference light that return through target to be measured (10) surface scattering carry out relevance ratio; Utilize cross-correlation method to measure chaos and survey light at the turnaround time of free space τ, the distance of target to be measured (10) is utilized formula
Calculate, wherein c represents the aerial velocity of propagation of light.
2. the device that is used for the chaos laser range-measurement method of claim 1 based semiconductor laser instrument, this device is as LASER Light Source with semiconductor laser (1), its output light is transferred to outer light feedback element (4) by Polarization Controller (2) and fiber coupler (3) successively, light through outer light feedback element (4) feedback returns along former road, refill semiconductor laser (1), the output characteristics of semiconductor laser modulation (1), change feedback light intensity and polarization state by regulating outer light feedback element (4) and Polarization Controller (2), make semiconductor laser (1) produce the chaotic laser light signal of higher-dimension;
The chaotic laser light signal that semiconductor laser (1) sends is by behind the fibre optic isolater (5), be divided into two bundles by fiber coupler (6), survey light I and reference light II, survey light I as distance measuring signal, amplify the back through image intensifer (8) and after collimating transmitting mirror (9) emission, shine target to be measured (10), received by astronomical telescope (11) as echoed signal by the chaotic laser light of target to be measured (10) surface scattering, amplify and be converted into electric signal through image intensifer (12) and import simple crosscorrelation instrument (15) with photodetector (13); Reference light II is converted to electric signal input simple crosscorrelation instrument (15) by photodetector (14) after fibre delay line (7) postpones calibration; Simple crosscorrelation instrument (15) carries out cross correlation function relatively as the signal analysis and processing device to reference light II and detection light I, measures and surveys light at the turnaround time of free space τ, calculates testing distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100126240A CN100478703C (en) | 2006-04-21 | 2006-04-21 | Chaos laser range-measurement method and device based on semiconductor laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100126240A CN100478703C (en) | 2006-04-21 | 2006-04-21 | Chaos laser range-measurement method and device based on semiconductor laser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1831560A CN1831560A (en) | 2006-09-13 |
| CN100478703C true CN100478703C (en) | 2009-04-15 |
Family
ID=36993971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100126240A Expired - Fee Related CN100478703C (en) | 2006-04-21 | 2006-04-21 | Chaos laser range-measurement method and device based on semiconductor laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100478703C (en) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226100B (en) | 2008-01-31 | 2010-08-25 | 太原理工大学 | Chaos light time domain reflectometer and measuring method thereof |
| CN102176020A (en) * | 2010-12-30 | 2011-09-07 | 太原理工大学 | Chaos Laser ranging device based on liquid crystal |
| CN102322806B (en) * | 2011-08-01 | 2013-08-07 | 杭州欧忆光电科技有限公司 | Brillouin optical time domain analyzer relevant to chaotic laser |
| WO2013020276A1 (en) * | 2011-08-10 | 2013-02-14 | 中国计量学院 | Brillouin optical time domain analyzer of chaotic laser-related integrated optical fiber raman amplifier |
| CN102680982A (en) * | 2012-05-07 | 2012-09-19 | 江苏经贸职业技术学院 | Laser ranging system based on low-frequency constant-exponential spectrum chaotic signal source and implementation method thereof |
| CN102692622B (en) * | 2012-05-28 | 2014-07-02 | 清华大学 | Laser detection method based on dense pulses |
| CN102739311B (en) * | 2012-06-21 | 2016-06-08 | 太原理工大学 | Fiber failure positioner and localization method thereof based on chaos visible laser |
| CN104614732A (en) * | 2014-12-19 | 2015-05-13 | 上海电机学院 | Chaotic light ranging technology based anti-collision signal processing system and method |
| CN104749579B (en) * | 2015-04-02 | 2017-08-25 | 太原理工大学 | A kind of fairway depth measuring method based on chaotic laser light device and its correlation method |
| DE102016200109A1 (en) * | 2015-09-18 | 2017-03-23 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Apparatus and method for detecting objects in a detection area |
| CN105762646B (en) * | 2016-04-20 | 2018-07-24 | 太原理工大学 | A kind of semiconductor chaos laser of collection feedback in pairs |
| CN106932897A (en) * | 2017-05-12 | 2017-07-07 | 京东方科技集团股份有限公司 | Quantum imaging method, quantum imaging system |
| CN108226898A (en) * | 2018-01-15 | 2018-06-29 | 深圳市速腾聚创科技有限公司 | Laser radar and the method for improving laser radar launch point frequency |
| CN110261861B (en) * | 2018-03-12 | 2023-12-15 | 中国科学院苏州纳米技术与纳米仿生研究所 | Laser chaos distance measuring device and distance measuring method based on superlattice device |
| CN109507684B (en) * | 2018-12-18 | 2020-05-19 | 华中科技大学 | High spatial resolution detection system and detection method based on noise-like pulses |
| US11543523B2 (en) * | 2018-12-28 | 2023-01-03 | Texas Instruments Incorporated | Multi frequency long range distance detection for amplitude modulated continuous wave time of flight cameras |
| CN109901182B (en) * | 2019-02-18 | 2021-08-03 | 杭州电子科技大学 | Laser ranging device and method based on second-order intensity correlation function |
| CN112346069B (en) * | 2019-08-08 | 2022-05-06 | 北京一径科技有限公司 | Echo processing method and device of laser radar, distance measuring method and device and laser radar system |
| CN111090098A (en) * | 2019-12-31 | 2020-05-01 | 广东博智林机器人有限公司 | Distance measuring optical system |
| CN112147623B (en) * | 2020-09-03 | 2024-03-12 | 五邑大学 | Multi-zone ranging method and system based on chaotic polarized radar |
| CN111780670B (en) * | 2020-09-04 | 2020-12-25 | 中铁工程服务有限公司 | Shield tunneling machine muck volume detection device and construction method thereof |
| CN112327270A (en) * | 2020-11-04 | 2021-02-05 | 国科光芯(海宁)科技股份有限公司 | On-chip integrated chaotic radar chip and preparation method thereof |
| CN113534178A (en) * | 2021-07-13 | 2021-10-22 | 西南大学 | Rapid correlation calculation method for ultra-wideband optical chaotic ranging |
| CN116559907B (en) * | 2023-05-12 | 2024-04-16 | 山西大学 | Underwater single photon three-dimensional imaging system based on chaotic laser and quantum correlation detection |
-
2006
- 2006-04-21 CN CNB2006100126240A patent/CN100478703C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1831560A (en) | 2006-09-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100478703C (en) | Chaos laser range-measurement method and device based on semiconductor laser | |
| CN105866795B (en) | The Larger Dynamic Wind measurement laser radar of F-P interferometers is scanned based on all -fiber | |
| CN106226778A (en) | A kind of coherent lidar system of high resolution measurement remote object | |
| CN102004255B (en) | Chirp amplitude laser infrared radar distance-Doppler zero-difference detection system | |
| CN206114903U (en) | High resolution measures coherent laser radar system of long -range target | |
| CN100362366C (en) | Apparatus and method for distance measurement using chaos laser of optical fiber laser device | |
| CN109459761A (en) | A kind of laser radar | |
| CN108375774A (en) | A kind of single photon image detecting laser radar of no-raster | |
| CN101236253A (en) | High precision speed-measuring distance-measuring radar system and method | |
| CN102928832A (en) | Remote laser distance measuring system based on high-speed pseudo-random code modulation and photon counting | |
| CN103743552B (en) | A kind of caliberating device of wide range continuous light path delay line | |
| CN109541636B (en) | Non-blind area high-distance resolution laser radar wind measurement system and method | |
| CN1831561A (en) | Chaos laser range-meaurement device and method of LD pumping solid laser | |
| CN103576162A (en) | Laser radar device and method for measuring target object distance through device | |
| CN101634571A (en) | Optical pulse raster distributed fiber sensing device | |
| CN103278811A (en) | Ultra wide band microwave photon long-distance range radar device based on chaos laser | |
| CN104914444A (en) | Long-distance laser heterodyne interference range-finding structure | |
| Mao et al. | Demonstration of In-Car Doppler Laser Radar at 1.55$\mu\hbox {m} $ for Range and Speed Measurement | |
| CN103472255A (en) | Full-optical-fiber Doppler coherent laser radar wind speed measuring device | |
| 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. | Multi-beam single-photon LiDAR with hybrid multiplexing in wavelength and time | |
| CN102176020A (en) | Chaos Laser ranging device based on liquid crystal | |
| Billault et al. | All-optical coherent pulse compression for dynamic laser ranging using an acousto-optic dual comb | |
| Yang et al. | A novel hybrid TOF/phase-shift method for absolute distance measurement using a falling-edge RF-modulated pulsed laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090415 Termination date: 20120421 |