CN202614940U - Range finding device based on microwave photon signal quadrature locking - Google Patents
Range finding device based on microwave photon signal quadrature locking Download PDFInfo
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- CN202614940U CN202614940U CN 201220244935 CN201220244935U CN202614940U CN 202614940 U CN202614940 U CN 202614940U CN 201220244935 CN201220244935 CN 201220244935 CN 201220244935 U CN201220244935 U CN 201220244935U CN 202614940 U CN202614940 U CN 202614940U
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Abstract
The present utility model discloses a range finding device based on microwave photon signal quadrature locking. The prior phase type laser range finding phase-discriminating circuit is complicated has high costs. The device is used for dividing radiofrequency signals generated by a sweep signal generator into two paths through a power divider, one path is sent to a Mach-Zehnder intensity modulator, the other path is sent to a mixer local oscillator port; laser output is sent to a first port of a three-port circulator after passing through the Mach-Zehnder intensity modulator, and sent to an optical fiber collimator to be emitted through a second port; optical signals reflected by an object are returned to the three-port circulator after passing through the optical fiber collimator, output to a light amplifier by a third port and moved into a photoelectric detector after being amplified; detected radiofrequency signals are sent to a mixer radio frequency port, a mixer intermediate frequency port is connected with a low pass filter, and the signals are sent to a computer after being filtered. Advantages of phase type laser range finding are inherited, high-precision middle and short distance measuring can be realized, and the precision can reach millimeter grade.
Description
Technical field
The utility model belongs to phase laser distance measurement field, is related to a kind of ranging locked based on microwave photon signal in orthogonal and device.
Background technology
Laser ranging is a kind of high-precision distance measurement technique got up with the development of scientific and technical especially laser technology, and it is related to the multiple technologies such as optics, laser, photoelectron and integrated electronic.Because laser has, monochromaticjty is good, angular resolution is high, strong antijamming capability, so compared with other ranging technologies, laser ranging can avoid the multipath effect and clutter problem of microwave ground proximity, and military and civilian field is widely applied to because of its good accuracy characteristic.According to different measuring environment and fields of measurement, laser ranging mainly has interferometric method, feedback transmitter, impulse method, four kinds of phase method.Wherein phase laser distance measurement precision is higher, is commonly used in precise distance measurement, and its ranging measurement accuracy is up to millimeter magnitude, and relative error is up to hundred a ten thousandths.Phase laser distance measurement technology realizes the measurement to target range using the range information that is included of phase difference of light wave between the modulation light of measurement transmitting and the reception light of reflection.Typically by phase difference of the radiofrequency signal of measurement modulation laser signal on testing distance produced by roundtrip propagation, indirectly the measurement signal propagation time, so as to obtain testing distance, in the process, the measurement of phase difference is just more crucial.It is many that method used in facies unit is surveyed at present, simulation can be divided into and survey phase method and the major class of digital method for measuring phase two, and it is to reach higher phase-measurement accuracy that phase method is surveyed in traditional simulation, the basic modulation frequency of selection is often higher, it is so also higher to circuit requirement, so that accurate survey mutually becomes difficult.Numeral surveys follow-up signal process circuit complexity used in phase technology, so as to cause cost higher.
The content of the invention
The purpose of this utility model is to overcome the shortcomings of that existing simulation survey phase method is simple there is provided a kind of signal processing circuit, while ensuring the device of higher range accuracy.
The utility model solves technical problem and takes the technical scheme to be：
The range unit locked based on microwave photon signal in orthogonal, including the radio-frequency signal generator with frequency sweep function, power splitter, narrow linewidth semiconductor laser, Mach increase Dare intensity modulator, three ports light rings, optical fiber collimator, image intensifer, high-speed photodetector, frequency mixer, low pass filter and computer.The radiofrequency signal that radio-frequency signal generator with frequency sweep function is produced is divided into two-way by power splitter, wherein delivering to Mach all the way increases Dare intensity modulator rf inputs, delivers to the local oscillator input port of frequency mixer all the way in addition；The output light of narrow linewidth semiconductor laser delivers to the first port of three ports light rings, and exported to optical fiber collimator transmitting by second port after Mach increases Dare intensity modulator；The optical signal of target reflection returns to three ports light rings after optical fiber collimator, and is exported by the 3rd port to image intensifer, and the output end of image intensifer is connected with high-speed photodetector；The radiofrequency signal of high-speed photodetector output delivers to the rf input port of frequency mixer, and the intermediate frequency delivery outlet of frequency mixer is connected with low pass filter, and filtered signal delivers to computer.
The beneficial effects of the utility model：The utility model improves the processing method to the phase difference comprising range information, the method locked with quadrature in phase handles the phase difference comprising range information, by measure it is orthogonal after frequency difference of the direct current signal between two continuous power smallest points, be that can obtain detection range using phase place change formula.The utility model not only inherits the general advantage of phase laser distance measurement, and can greatly simplify phase demodulation partial circuit, while expanding finding range and improving range accuracy.
Brief description of the drawings
Fig. 1 is the apparatus structure schematic diagram in the utility model.
Embodiment
The utility model is further described with reference to the accompanying drawings and detailed description：
As shown in fig. 1, the range unit locked based on microwave photon signal in orthogonal, Dare intensity modulator 4, three ports light rings 5, optical fiber collimator 6, image intensifer 7, high-speed photodetector 8, frequency mixer 9, low pass filter 10 and computer 11 are increased comprising the radio-frequency signal generator 1 with frequency sweep function, power splitter 2, narrow linewidth semiconductor laser 3, Mach.The radiofrequency signal that radio-frequency signal generator 1 with frequency sweep function is produced is divided into two-way by power splitter 2, wherein delivering to Mach all the way increases the rf inputs of Dare intensity modulator 4, delivers to the local oscillator input port of frequency mixer 9 all the way in addition；The output light of narrow linewidth semiconductor laser 3 delivers to the first port 5-1 of three ports light rings 5 after Mach increases Dare intensity modulator 4, and is exported to optical fiber collimator 6 and launch by second port 5-2；The optical signal of target reflection returns to three ports light rings 5 after optical fiber collimator 6, and is exported by the 3rd port 5-3 to image intensifer 7, and the output end of image intensifer 7 is connected with high-speed photodetector 8；The radiofrequency signal that high-speed photodetector 8 is exported delivers to the rf input port of frequency mixer 9, and the intermediate frequency delivery outlet of frequency mixer 9 is connected with low pass filter 10, and filtered signal delivers to computer 11.
Distance measurement method is carried out using said apparatus：The high frequency lasers signal that narrow linewidth semiconductor laser 3 is sent, which is inputted to Mach, increases the light input end of Dare intensity modulator 4, radio-frequency signal generator 1 with frequency sweep function is divided into two-way through power splitter 2, wherein increase the rf inputs of Dare intensity modulator 4 with Mach all the way to be connected, increase in Mach and realize modulation of the low-frequency electrical signal to high frequency lasers signal in Dare intensity modulator 4, optical signal after modulation increases the first port 5-1 that the light output end of Dare intensity modulator 4 is delivered to three ports light rings 5 through Mach, the second port 5-2 of three ports light rings 5 is connected with optical fiber collimator 6, modulation light is launched through optical fiber collimator 6.The optical signal that target is reflected is delivered to the second port 5-2 of three ports light rings 5 after optical fiber collimator 6, 3rd port 5-3 of three ports light rings 5 is connected with the light input end of image intensifer 7, the amplification of optical signal is realized by image intensifer 7, the light output end of image intensifer 7 is connected with the light input end of high-speed photodetector 8, realize that intensity variation is converted into the change of electric signal on high-speed photodetector 8, the electricity output end of high-speed photodetector 8 is connected with the rf input port of frequency mixer 9, the local oscillator input port for being delivered to frequency mixer 9 all the way in addition of power splitter 2, obtain ignoring the direct current signal of amplitude size after mixing by low pass filter 10
,
, wherein
The phase changing capacity produced back and forth on testing distance to modulate light,ω RF For radio frequency signal frequency,nFor the aerial refractive index of light, l For 2 times of distance detected,cFor the light velocity.Direct current signal radio frequency signal frequency obtained by after mixing and filteringω RF In cyclically-varying, by the output frequency for automatically adjusting the radio-frequency signal generator 1 with frequency sweep function, the two-way radiofrequency signal into the local oscillator input port of frequency mixer 9 and rf input port is locked on quadrature in phase point, have minimum power in the direct current signal of this intermediate frequency delivery outlet of frequency upper frequency mixer 9.Selected phase orthogonal points is that the change of radio frequency signal frequency is most fast near smallest point because of direct current signal power, and radio frequency signal intensity is most slow near maximum point, so power scale smallest point has highest measurement accuracy.This frequency under computer recording, the radio-frequency signal generator for having frequency sweep function simultaneously continually looks for next orthogonal keyed end, and two continuous quadrature in phase point phase differences are π, so calculating measurement distance by repeatedly measuring the frequency difference between two neighboring orthogonal keyed end.
Operation principle of the present utility model is as follows：
The light wave expression formula of light that narrow linewidth semiconductor laser 3 is produced is
, wherein
For laser field intensity amplitude,ω 0 For frequency of light wave.Described narrow linewidth semiconductor laser 3, output light is coherent light, and line width is very narrow, and phase is very stable, is mutually made an uproar low, is more beneficial for high-precision range measurement.
The analog signal that radio-frequency signal generator 1 with frequency sweep function is produced is
,V RF For the amplitude of input radio frequency signal,ω RF For radio frequency signal frequency.The described radio frequency swept signal generator 1 with frequency sweep function, with good frequency stability, while swept frequency range is very big, centre frequency so may insure the accuracy of detection range up to 10GHz.
Magnitude of voltage needed for Mach increases the D.C. regulated power supply of Dare intensity modulator 4 isV DC .Described Mach increases electrooptic effect of the Dare intensity modulator 4 using lithium columbate crystal, it is operated in linear work point by adjusting the size of D.C. regulated power supply so that intensity modulated efficiency highest.
The bias point of Mach increasing Dare intensity modulator 4 is arranged on half-wave voltage in the utility modelV π Position, i.e.,V DC = V π / 2, it is maximum that can thus make used single order electrical signal gain among experiment, while can be very good to suppress second order signal.
Mach increases being expressed as the output intensity of Dare intensity modulator 4： 
Wherein
The phase additional amount produced for the chirp of modulator,
The light intensity inputted for laser 3,
Increase the loss of Dare intensity modulator 4 for Mach,
It is the light intensity for increasing the output of Dare intensity modulator 4 from Mach.
Mach increases the output intensity of Dare intensity modulator 4lAir borne after light intensity be
, wherein,It is in distance for modulation lightlAir in produced by phase changing capacity,ω RF For radio frequency signal frequency, nFor the aerial refractive index of light,cFor the light velocity.
According to photodetector detection principle, then the photoelectric current expression formula that high-speed photodetector 8 is exported is：
, wherein
For the total losses of link.
Described high-speed photodetector 8 is the PIN photodiode high-speed photodetector of high-responsivity, and it matches with the operation wavelength of narrow linewidth semiconductor laser 3, and the output end of high-speed photodetector 8 is provided with partiting dc capacitor.
The photoelectric current expression formula exported with the high-speed photodetector 8 that stopping direct current is acted on is deployed using Bessel Formula, while ignoring high order component, can obtain first order signal output current is：
By this single order electric signal and the analog signal on another road of power splitter 2It is mixed in frequency mixer 9, low-pass filtered device 10 obtains ignoring the direct current signal of amplitude size
.Described low pass filter 10 is the low pass filter with relatively low cut-off frequency, can effectively filter out the higher hamonic wave that mixing is produced.
Frequency sweep is carried out by the signal generator 1 with frequency sweep function so that
Change with the change of frequency, so as to make direct current signal
Watt level also changes with the change of frequency, and the continuous two power smallest points of DC quantity in mixing results are determined by the change of performance number, while recording the corresponding frequency values of the two power smallest points differencef RF1 Withf RF2 , the frequency difference of the two continuous power smallest points is
, by repeatedly measuring frequency difference and formula between two neighboring orthogonal keyed end, measurement distance can be calculated
, gained measurement distancelHalf be distance that our targets to be determined are detected thing
。
The utility model is the measurement that the method locked with quadrature in phase realizes distance, the complexity of follow-up signal process circuit is reduced on the basis of existing instrument and equipment being realized in the case of ensuring precision distance measurement, greatly reduce cost, simultaneously the signal generator with frequency sweep function that is used can swept frequency range it is very big, centre frequency is up to 10GHz, so institute's ranging is from up to very high precision.
Claims (1)
1. the range unit locked based on microwave photon signal in orthogonal, including the radio-frequency signal generator with frequency sweep function（1）, power splitter（2）, narrow linewidth semiconductor laser（3）, Mach increase Dare intensity modulator（4）, three ports light rings（5）, optical fiber collimator（6）, image intensifer（7）, high-speed photodetector（8）, frequency mixer（9）, low pass filter（10）And computer（11）, it is characterised in that：Radio-frequency signal generator with frequency sweep function（1）The radiofrequency signal of generation passes through power splitter（2）It is divided into two-way, wherein delivering to Mach all the way increases Dare intensity modulator（4）Rf inputs, deliver to frequency mixer all the way in addition（9）Local oscillator input port；Narrow linewidth semiconductor laser（3）Output light by Mach increase Dare intensity modulator（4）Afterwards, three ports light rings are delivered to（5）First port（5-1）, and by second port（5-2）Export to optical fiber collimator（6）Transmitting；The optical signal of target reflection is through optical fiber collimator（6）After return to three ports light rings（5）, and by the 3rd port（5-3）Export to image intensifer（7）, image intensifer（7）Output end and high-speed photodetector（8）It is connected；High-speed photodetector（8）The radiofrequency signal of output delivers to frequency mixer（9）Rf input port, frequency mixer（9）Intermediate frequency delivery outlet and low pass filter（10）It is connected, filtered signal delivers to computer（11）.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220244935 CN202614940U (en) | 2012-05-29 | 2012-05-29 | Range finding device based on microwave photon signal quadrature locking |
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| CN 201220244935 CN202614940U (en) | 2012-05-29 | 2012-05-29 | Range finding device based on microwave photon signal quadrature locking |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680981A (en) * | 2012-05-29 | 2012-09-19 | 浙江大学 | Distance measurement method and device based on orthogonal locking of microwave photon signals |
| CN107662873A (en) * | 2016-07-29 | 2018-02-06 | 奥的斯电梯公司 | Sensor cluster, security system and passenger conveyor |
-
2012
- 2012-05-29 CN CN 201220244935 patent/CN202614940U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680981A (en) * | 2012-05-29 | 2012-09-19 | 浙江大学 | Distance measurement method and device based on orthogonal locking of microwave photon signals |
| CN102680981B (en) * | 2012-05-29 | 2013-12-04 | 浙江大学 | Distance measurement method and device based on orthogonal locking of microwave photon signals |
| CN107662873A (en) * | 2016-07-29 | 2018-02-06 | 奥的斯电梯公司 | Sensor cluster, security system and passenger conveyor |
| CN107662873B (en) * | 2016-07-29 | 2021-08-24 | 奥的斯电梯公司 | Sensor assembly, safety system and passenger conveyor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20150529 |
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| EXPY | Termination of patent right or utility model |