CN204044355U - A kind of calibrating installation of laser ranging and surveying instrument - Google Patents
A kind of calibrating installation of laser ranging and surveying instrument Download PDFInfo
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- CN204044355U CN204044355U CN201420426743.0U CN201420426743U CN204044355U CN 204044355 U CN204044355 U CN 204044355U CN 201420426743 U CN201420426743 U CN 201420426743U CN 204044355 U CN204044355 U CN 204044355U
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Abstract
The utility model relate to a kind of to solve in prior art circuit response time long, easily produce mechanical fault, serviceable life is short or cost is high, the calibrating installation of the laser ranging of the problem of easy generation co-channel interference and surveying instrument; Emitter, first light wave different for emission wavelength and the second light wave, wherein, a part for first light wave is as outer light path first signal, as outer light path secondary signal after another part of first light wave is turned back by measured target reflection, a part for second light wave is as interior light path first signal, and another part of the second light wave is as interior light path secondary signal; First photoelectric conversion device, carries out opto-electronic conversion for receiving outer light path first signal and interior light path first signal respectively and exports respectively; Second photoelectric conversion device, carries out opto-electronic conversion for receiving outer light path secondary signal and interior light path secondary signal respectively and exports respectively; Phase detector, exports for carrying out phase compare the phase signal eliminating substrate reference.
Description
Technical field
The utility model belongs to electro-optical distance measurement field, particularly relates to a kind of calibrating installation and surveying instrument of laser ranging.
Background technology
Laser ranging, due to its measuring accuracy Gao Keda millimeter rank, and is used widely in short distance laser ranging in 200 meters.Based on the laser ranging of surveying Phase Difference Principle, it is the laser beam irradiation measured target with modulation, laser beam turns back after measured target reflection, phase place change laser beam two-way process produced is converted into the distance of measured target, and its accuracy measured and precision are subject to the impact of distance measuring equipment inner body characteristic.The accuracy requirement of laser ranging instrument is higher, and the complexity of its circuit and the demand of accurate device just improve greatly.Therefore, environmental factor is if temperature and device serviceable life are on the impact of device performance and then the phase drift that causes device to produce, very important.
Prior art generally adopts the phase difference compensation principle of inside and outside light path to eliminate the additional phase shift of Circuits System, guarantees that measurement data does not affect by outside environmental elements.Eliminate the phase difference compensation principle of additional phase shift, as follows:
If distance measuring signal successively forms delayed phase differential through interior light path and outer light path
with
for the additional phase shift that instrument internal electronic circuit produces in transmission signal process, then inside and outside light path distance measuring signal Φ
inwith Φ
outwardin phaser respectively at the comparative result of reference signal be:
In above-mentioned,
change with Instrument working state change, for random phase shift, cannot be solved by accurate Calculation, when finding range, be used alternatingly inside and outside light path and carry out survey phase, within the short time of alternation procedure, can think that additional phase shift does not change, so get the difference of inside and outside light path comparative result as measurement result, namely
Above result Φ has eliminated the impact of additional phase shift instability, thus ensure that the precision of range finding.
For the elimination of above-mentioned additional phase shift, the following calibration steps of general employing in prior art:
(1) system received by single-shot list, namely single channel sends light beam single channel receiving light path signal, by a controllable mechanical hook-up or optoelectronic switch, as liquid crystal light valve, realize the switching of inside and outside light path, carrying out phase correction by calculating the phase value switching the inside and outside light path in front and back, eliminating the uncertain phase interference of environment.Owing to adopting physical mechanical switch, mechanical response time long (being generally hundreds of milliseconds of ranks), can not real time calibration, and structure relative complex, easily produce mechanical wear and fault, serviceable life is short, is not suitable as industrial exact instrument and uses; The shortcomings such as adopt liquid crystal light valve to be typical optoelectronic switch, there is cut-off bad, contrast is little simultaneously, and the large and cost of temperature influence is higher, are difficult to use in every field in enormous quantities.
(2) single-emission and double-receiving system, i.e. single channel transmitted beam receive inside and outside optical path signal respectively by two-way, two-way Received signal strength carries out processing and calculating its phase differential respectively, thus eliminates the uncertain phase interference of environment.This system adopts two avalanche diodes (Avalanche Photo Diode, APD) inside and outside optical path signal is received respectively, but in real work, two snowslide pipes produce due to inherent parameters difference cannot eliminate both bring common mode phase error due to environmental change; Therefore in actual design, need the snowslide pipe considering pairing avalanche voltage close (within 1V pressure reduction), cause very big workload and dull material;
(3) traditional double bill receives system, namely two-way independent transmission Same Wavelength light beam and by receiving trap be taken up in order of priority receive inside and outside optical path signal, two-way Received signal strength carries out processing and calculating its phase differential respectively, thus eliminates the uncertain phase interference of environment.This system adopt two independently photoelectricity generating means there is the lightwave signal of two-way phase co-wavelength respectively, and due to two-way photoelectricity generating means, particularly laser tube, operationally because inside and outside light path working time is different and two laser activity difference as easy as rolling off a log generation different temperatures drifts cannot be eliminated by above-mentioned principle, thus produce the drift of measuring distance.
In sum, above three kinds of solutions equal existing defects in actual applications.
Therefore, those skilled in the art urgently develop a kind of calibrating installation of the laser ranging based on survey phase differential, can solve circuit response time length in prior art, easily produce mechanical fault, serviceable life is short or cost is high, the problem of easy generation co-channel interference.
Utility model content
For solving the problems of the technologies described above, the purpose of this utility model be to provide a kind of to solve in prior art circuit response time long, easily produce mechanical fault, serviceable life is short or cost is high, the calibrating installation of the laser ranging of the problem of easy generation co-channel interference and surveying instrument.
For achieving the above object, the utility model provides following technical scheme:
The utility model provides a kind of calibrating installation of laser ranging, comprising:
Emitter, for generating according to high-frequency oscillation signal modulation the first light wave and the second light wave that also emission wavelength is different, wherein, a part for described first light wave is as outer light path first signal, as outer light path secondary signal after another part of described first light wave is turned back by measured target reflection, a part for described second light wave is as interior light path first signal, and another part of described second light wave is as interior light path secondary signal
First photoelectric conversion device, carries out opto-electronic conversion for receiving outer light path first signal and interior light path first signal respectively and exports respectively;
Second photoelectric conversion device, is reflected the outer light path secondary signal of turning back by measured target and interior light path secondary signal is carried out opto-electronic conversion and exports respectively for receiving respectively;
Phase detector, for receiving the signal that described first photoelectric conversion device and described second photoelectric conversion device export respectively, carrying out phase compare and exporting the phase signal eliminating substrate reference.
Further, also comprise:
Frequency mixer, for light path first signal, outer light path first signal in described first photoelectric conversion device output are carried out with same mixed frequency signal exporting described phase detector to after mixing is also amplified respectively, also for light path secondary signal, outer light path secondary signal in described second photoelectric conversion device output are carried out with same mixed frequency signal exporting described phase detector to after mixing is also amplified respectively.
Further, described first photoelectric conversion device, the second photoelectric conversion device and described frequency mixer are contained in a receiving trap, and described receiving trap comprises photodiode, phototriode, avalanche diode or photomultiplier.
Further, also comprise:
Oscillator, for generation of and export described high-frequency oscillation signal and described mixed frequency signal;
And/or
Multiplying arrangement, for receiving the output signal of described first photoelectric conversion device and the second photoelectric conversion device and carrying out amplifying, exporting.
Further, also comprise the first reflecting surface, the second reflecting surface, the first optical filter and the second optical filter, wherein:
First reflecting surface, for reflecting outer light path first signal and interior light path first signal to the first photoelectric conversion device;
First optical filter, for filtering outer light path secondary signal to measured target, and for reflecting interior light path secondary signal to the second photoelectric conversion device;
Second optical filter, is arranged between the first optical filter and the second photoelectric conversion device, and for filtering described interior light path secondary signal;
Second reflecting surface, be arranged on the second optical filter and and the second photoelectric conversion device between, and for reflecting described interior light path secondary signal to the second photoelectric conversion device.
Concrete, described first reflecting surface and the second reflecting surface are optical reflection parts or optics light guide member, described optical reflection parts are reflecting prism, total reflective mirror or other possess the optical reflection parts of function of optical reflection, described optics light guide member is optical fiber, photoconductive tube or other possess the optics light guide member of optics light-guiding function, described first optical filter and the second optical filter are optical element, described optical element is optical glass coating, optical plastic plated film or other possess conducting and cut-off optical path signal optical element.
Concrete, described emitter is laser diode or the light emitting diode of launching one or more wavelength.
The utility model also provides a kind of surveying instrument of laser ranging, comprises the calibrating installation of above-mentioned laser ranging.
By such scheme, the utility model at least has the following advantages: the utility model embodiment provides a kind of based on two two laser ranging calibrating installations receiving double light path phase measurement, adopt in the integrated emitter of two-way to produce from different optical filter respectively by reflecting surface, outer optical path signal, interior optical path signal and outer optical path signal is received respectively again by signal receiving device, then two paths of signals carries out phase compare and obtains phase differential to realize the object of phase compensation and calibration, avoid environmental change and introduce uncertain phase noise in circuit, improve the measuring accuracy of laser ranging, add the range finding degree of stability of system, decrease the impact of environmental factor on range error, reduce the performance requirement of system to components and parts, thus reduce the cost of system, strengthen the application of laser ranging in every profession and trade.
To send out two receipts system different from traditional double, and the utility model adopts two-way receiving system successively two kinds of light waves launching of receiving and transmitting unit, can eliminate environment temperature and spontaneous thermogenetic temperature drift by calibration; Adopt the light path emission coefficient of different wave length and filter set to be effectively separated inside and outside light path simultaneously, send out two debit's case laser tube that structurally diverse location or angle place Same Wavelength respectively compared with traditional double and improve the compactedness of system and reduce dispersion and launch the radio frequency cross talk and interference problem that bring.
Above-mentioned explanation is only the general introduction of technical solutions of the utility model, in order to better understand technological means of the present utility model, and can be implemented according to the content of instructions, coordinates accompanying drawing to be described in detail as follows below with preferred embodiment of the present utility model.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the calibration steps of the laser ranging that the utility model embodiment one provides;
Fig. 2 is the structural representation of the calibrating installation of the laser ranging that the utility model embodiment one provides;
Fig. 3 is the structural representation of the calibrating installation of the laser ranging that the utility model embodiment two provides;
Fig. 4 is the structural representation of the calibrating installation of the laser ranging that the utility model embodiment three provides;
Fig. 5 is the electrical block diagram of the calibrating installation of the laser ranging that the utility model embodiment four provides.
Embodiment
Core of the present utility model is the calibrating installation providing a kind of laser ranging, solves circuit response time length in prior art, easily produces mechanical fault, serviceable life is short or cost is high, the problem of easy generation co-channel interference.
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment one
The utility model provides a kind of calibration steps of laser ranging, adopts two kinds of light waves of two-way receiving system successively receiving and transmitting unit transmitting, can eliminate environment temperature and spontaneous thermogenetic temperature drift by calibration; Adopt the light path emission coefficient of different wave length and filter set to be effectively separated inside and outside light path simultaneously, send out two debit's case laser tube that structurally diverse location or angle place Same Wavelength respectively compared with traditional double and improve the compactedness of system and reduce dispersion and launch the radio frequency cross talk and interference problem that bring.
The calibration steps realization flow of the laser ranging that the present embodiment provides is as shown in Figure 1, specific as follows:
Step S
201, the first light wave launched by emitter, and a described first light wave part is received by first receiving device, as outer light path first signal, described first light wave another part is received, as outer light path secondary signal by the second receiving trap after being turned back by measured target reflection;
Step S
202, the second light wave launched by emitter, and described a second light wave part is received by first receiving device, as interior light path first signal, described second light wave another part is received by the second receiving trap, as interior light path secondary signal;
Step S
203described interior light path secondary signal, outer light path secondary signal and described interior light path first signal, outer light path first signal carry out phase compare, and export the interior light path phase signal and outer light path phase signal of eliminating part of substrate reference, internally light path phase signal, outer light path phase signal carry out phase compare again, export the final phase signal eliminating substrate reference;
Wherein, described first light wave and the second light wave generate according to high-frequency oscillation signal modulation, and the wavelength of described first light wave is not equal to the wavelength of the second light wave.
In the present embodiment, described interior light path first signal is received and outer light path first signal, described second receiving trap receive described interior light path secondary signal and outer light path secondary signal, carry out phase compare at described first receiving device, and before exporting the interior light path phase signal and outer light path phase signal eliminating part of substrate reference, the calibration steps of described laser ranging comprises the steps: that described interior light path first signal, outer light path first signal, interior light path secondary signal and outer light path secondary signal carry out mixing with mixed frequency signal respectively further; The mixed frequency signal of mixing is carried out with described interior light path first signal, outer light path first signal, interior light path secondary signal and outer light path secondary signal, can be same high-frequency oscillation signal, also can be that frequency is identical, phase place is identical or there are multiple high-frequency oscillation signals of fixed skew.
In the present embodiment, described first light wave and described second light wave are laser.
In the utility model embodiment, emitter can first launch the first light wave, thus completing the generation of outer light path first signal and outer light path secondary signal, the second light wave launched again by emitter, thus completes the generation of interior light path first signal and interior light path secondary signal; Also can first launch the second light wave by emitter, thus complete the generation of interior light path first signal and interior light path secondary signal, the first light wave launched again by emitter, thus completes the generation of outer light path first signal and outer light path secondary signal.
Wherein, first receiving device first can receive outer light path first signal and outer light path secondary signal, then receives interior light path first signal and interior light path secondary signal; Also first can receive interior light path first signal and interior light path secondary signal, then receive outer light path first signal and outer light path secondary signal; Second receiving trap first can receive interior light path first signal and interior light path secondary signal, then receives outer light path first signal and outer light path secondary signal; Also first can receive outer light path first signal and outer light path secondary signal, then receive interior light path first signal and interior light path secondary signal.
First receiving device in the present embodiment and the second receiving trap can be the device that photodiode, phototriode, APD, photomultiplier etc. have photoelectric converting function.
The present embodiment provides a kind of calibrating installation of laser ranging, the calibrating installation of this laser ranging is based on two two laser ranging calibration stepss receiving double light path phase measurement, adopt the emitter that two-way is integrated, its structural principle as shown in Figure 2, for convenience of explanation, the present embodiment only provides the part relevant to the utility model embodiment.
The calibrating installation of a kind of laser ranging that the present embodiment provides, comprising:
Emitter 301, for generating according to high-frequency oscillation signal modulation the first light wave and the second light wave that also emission wavelength is different, wherein, a part for described first light wave is as outer light path first signal, as outer light path secondary signal after another part of described first light wave is turned back by measured target reflection, a part for described second light wave is as interior light path first signal, and another part of described second light wave is as interior light path secondary signal
First photoelectric conversion device 303, carries out opto-electronic conversion for receiving outer light path first signal and interior light path first signal respectively and exports respectively;
Second photoelectric conversion device 306, is reflected the outer light path secondary signal of turning back by measured target and interior light path secondary signal is carried out opto-electronic conversion and exports respectively for receiving respectively;
Phase detector 307, the signal exported for receiving described first photoelectric conversion device and described second photoelectric conversion device respectively carries out phase demodulation, and interior light path secondary signal, outer light path secondary signal are carried out respectively phase compare with interior light path first signal, outer light path first signal and export and eliminate light path phase signal in part of substrate reference, outer light path phase signal, again phase compare is carried out to light path phase signal, outer light path phase signal in output, export the final phase signal eliminating substrate reference.
In the present embodiment, the calibrating installation of laser ranging of the present utility model also comprises the first reflecting surface, the second reflecting surface, the first optical filter and the second optical filter, wherein: the first reflecting surface 302, for reflecting outer light path first signal and interior light path first signal to the first photoelectric conversion device; First optical filter 304, for filtering outer light path secondary signal to measured target, and for reflecting interior light path secondary signal to the second photoelectric conversion device; Second optical filter 305, is arranged between the first optical filter and the second photoelectric conversion device, and for filtering described interior light path secondary signal; Second reflecting surface, be arranged on the second optical filter and and the second photoelectric conversion device between, and for reflecting described interior light path secondary signal to the second photoelectric conversion device.
In the utility model embodiment, the first reflecting surface 302 is aimed at the first photoelectric conversion device 303, makes the first light wave and the second light wave be directly incident in the first photoelectric conversion device 303; First optical filter 304 is aimed at the second photoelectric conversion device 306 with the second optical filter 305, makes the second light wave be directly incident in the second photoelectric conversion device 306; Also can be provided with the second reflecting surface to change light path between the second optical filter 305 and the second photoelectric conversion device 306, be convenient to the second photoelectric conversion device 306 and receive; Can also be connected with optical signal transmission line between the second optical filter 305 and the second photoelectric conversion device 306, this transmission line can be optical fiber, light pipe.The first light wave launched by emitter, a part for first light wave is received by first receiving device through the first reflective surface, do not passed through the first optical filter to measured target by first light wave another part of the first reflective surface, described first light wave is received by the second receiving trap after being turned back by measured target reflection, meanwhile, ended by the second optical filter by the first light wave of the first optical filter reflection; The second light wave that emitter emission wavelength is different, a part for second light wave is received by first receiving device through the first reflective surface, not ended by the first optical filter by second light wave another part of the first reflective surface and after reflecting, by the second optical filter and the second reflecting surface to the second receiving trap.
Wherein, first reflecting surface 302, second reflecting surface, first optical filter 304, second optical filter 305 is optical device, object is reflection, distinguish, conducting or cut-off the first light wave and the second light wave, build the inside and outside device of distance measuring equipment, described first reflecting surface 302 and the second reflecting surface are optical reflection parts or optics light guide member, described optical reflection parts are reflecting prism, total reflective mirror or other possess the optical reflection parts of function of optical reflection, described optics light guide member is optical fiber, photoconductive tube or other possess the optics light guide member of optics light-guiding function, described first optical filter 304 and the second optical filter 305 are optical element, described optical element is optical glass coating, optical plastic plated film or other optical element possessing conducting and end optical path signal.
In the utility model embodiment, emitter 301 comprises clock generator, modulation drive circuit, light-emitting device, wherein light-emitting device launches light wave under the driving of driver, this light-emitting device can be laser diode (Laser Diode, LD), light emitting diode (Light Emitting Diode, LED) or other luminescent device.
In addition, the first photoelectric conversion device 303, second photoelectric conversion device 306 can be first receiving device, the second receiving trap substitutes, and receiving trap can be the photoelectric conversion devices such as photodiode, phototriode, APD or photomultiplier.
In the utility model embodiment, the first photoelectric conversion device first can receive outer light path first signal and outer light path secondary signal, then receives interior light path first signal and interior light path secondary signal; Also first can receive interior light path first signal and interior light path secondary signal, then receive outer light path first signal and outer light path secondary signal; Second photoelectric conversion device first can receive interior light path first signal and interior light path secondary signal, then receives outer light path first signal and outer light path secondary signal; Also first can receive outer light path first signal and outer light path secondary signal, then receive interior light path first signal and interior light path secondary signal.
The utility model eliminates the phase difference compensation principle of additional phase shift, is summarized as follows:
If distance measuring signal first after through interior light path and the delayed phase differential of outer light path stroke be respectively Ψ
inand Ψ
outward, the two wavelength light waves that laser beam emitting device is launched are Ψ through first receiving device identified result in phase detector
interior 1and Ψ
outer 1, the phase place of the two wavelength light waves that the second receiving trap receives is respectively Ψ
interior 2and Ψ
outer 2, the additional phase shift that the electronic signal that the first signal Instrumental internal signal generator part produces transmits at circuit and produces in photoelectric conversion process is Δ Ψ
1, the additional phase shift that the electronic signal that secondary signal Instrumental internal signal generator part produces transmits at circuit and produces in photoelectric conversion process is Δ Ψ
2, the signal phase that emitter produces is Ψ
send out, then inside and outside light path distance measuring signal contrasts phase result and is in phase detector
Ψ
interior 2=Δ Ψ
2+ Ψ
in+ Ψ
send out
Ψ
outer 2=Δ Ψ
2+ Ψ
outward+ Ψ
send out
Ψ
interior 1=Δ Ψ
1+ Ψ
send out
Ψ
outer 1=Δ Ψ
1+ Ψ
send out
In above formula, Ψ
interior 1, Ψ
outer 1, Δ Ψ
2produce the change of duty in varying environment with instrument, for random phase shift, cannot be solved by accurate Calculation, so when finding range, be used alternatingly inside and outside light path and carry out survey phase, within the short time of alternation procedure, can think that additional phase shift does not change, so get the difference of inside and outside light path than phase result as measurement result, namely
Ф=Ф
outward– Ф
in=(Ψ
outer 2– Ψ
outer 1) – (Ψ
interior 2– Ψ
interior 1)=(Δ Ψ
2– Δ Ψ
1+ Ψ
outward) – (Δ Ψ
2– Δ Ψ
1+ Ψ
in)=Ψ
outward– Ψ
in
Above result Ф has eliminated the impact of additional phase shift instability, thus ensure that the precision of range finding.
Embodiment two
The present embodiment provides a kind of calibrating installation of laser ranging, the calibrating installation of this laser ranging is based on two two laser ranging calibration stepss receiving double light path phase measurement, adopt the emitter that two-way is integrated, its structural principle as shown in Figure 3, for convenience of explanation, the present embodiment only provides the part relevant to the utility model embodiment.
The calibrating installation of a kind of laser ranging that the present embodiment provides, comprise oscillator 401, emitter 402, first reflecting surface 403, first photoelectric conversion device 404, first optical filter 405, second optical filter 406, second photoelectric conversion device 407, and high frequency amplifying apparatus 408, frequency mixer 409, low frequency multiplying arrangement 410 and phase detector 411.
The present embodiment is compared with embodiment one, and difference is, the calibrating installation of the laser ranging that the present embodiment provides also comprises oscillator 401, high frequency amplifying apparatus 408, frequency mixer 409 and low frequency multiplying arrangement 410.
Produce synchronous first high-frequency oscillation signal of same frequency and the second high-frequency oscillation signal by oscillator 401, emitter 402 receive come self-oscillator 401 the first high-frequency oscillation signal, modulate the first light wave and the second light wave, and launch as optical path signal;
Described first light wave is reflected by the first reflecting surface 403 and is that the first photoelectric conversion device 404 receives, as outer light path first signal, electric signal is exported after carrying out opto-electronic conversion, the first light wave do not reflected by the first reflecting surface 403 is by the first optical filter 405 to measured target 412, turn back after being reflected by measured target 412, received by the second photoelectric conversion device 407, as outer light path secondary signal, after carrying out opto-electronic conversion, export electric signal; The outer light path electric signal that photoelectric conversion device 404,407 exports is that the electric signal of high frequency is successively undertaken amplifying and exporting by high frequency amplifying apparatus 408, frequency mixer 409 receives the second high-frequency oscillation signal that signal and oscillator 401 from multiplying arrangement 408 export and carries out mixing, export the signal after mixing, described mixed frequency signal is amplified into phase detector 411 by low frequency multiplying arrangement 410.
Described second light wave is reflected by the first reflecting surface 403 and is that the first photoelectric conversion device 404 receives, as interior light path first signal, electric signal is exported after carrying out opto-electronic conversion, after not ended reflection by the first light wave that the first reflecting surface 403 reflects by the first optical filter 405, received by the second photoelectric conversion device 407, as interior light path secondary signal, after carrying out opto-electronic conversion, export electric signal; The interior light path electric signal that photoelectric conversion device 404,407 exports is that the electric signal of high frequency is successively undertaken amplifying and exporting by high frequency amplifying apparatus 408, frequency mixer 409 receives the second high-frequency oscillation signal that signal and oscillator 401 from multiplying arrangement 408 export and carries out mixing, export the signal after mixing, described mixed frequency signal is amplified into phase detector 411 by low frequency multiplying arrangement 410.
In last, light path and outer light path electric signal are by phase detector phase demodulation and phase difference output signal.
In the utility model embodiment, oscillator 401 is crystal oscillator, quartz (controlled) oscillator, PLL (phaselocked loop), DDS (Direct Digital Frequency Synthesizers) or other frequency generator part and circuit; Frequency mixer 409 is analog multiplier, down-conversion mixer or other electronics frequency mixer or have the photoelectricity mixer device of mixing function as photodiode, phototriode, APD (avalanche diode), photomultiplier etc.
It should be noted that in the utility model embodiment, high frequency amplifying apparatus 408 and low frequency multiplying arrangement 410 are also nonessential, and the object of high frequency amplifying apparatus 408 is the high frequency electrical signal of reception to amplify, and cost of parts is relatively high; The object of low frequency multiplying arrangement 410 is that the low frequency electrical after by mixing number amplifies, and cost of parts is relatively low; If other device performance of circuit is good, high frequency amplifying apparatus 408 and low frequency multiplying arrangement 410 can omit one or all; If the first photoelectric conversion device 404, second photoelectric conversion device 407 is replaced by two receiving traps respectively together with frequency mixer 409, so high frequency amplifying apparatus 408 can be omitted, and directly connects low frequency tele-release bigger device 410 after receiving trap 404,407.
Embodiment three
The present embodiment provides a kind of calibrating installation of laser ranging, the calibrating installation of this laser ranging is based on two two laser ranging calibration stepss receiving double light path phase measurement, adopt the emitter that two-way is integrated, its structural principle as shown in Figure 4, for convenience of explanation, the present embodiment only provides the part relevant to the utility model embodiment.
The present embodiment is compared with embodiment two, difference is, first photoelectric conversion device 404, second photoelectric conversion device 407 is replaced by two receiving traps respectively together with frequency mixer 409, described receiving trap realizes the function of photoelectric conversion device 404,407 and frequency mixer 409 simultaneously, and receiving trap can have the device of photoelectric converting function for one or more photodiode, phototriode, APD, PMT (photomultiplier) etc.
The calibrating installation of a kind of laser ranging that the present embodiment provides, comprises oscillator 501, emitter 502, first reflecting surface 503, first optical filter 504, second optical filter 505, first receiving device 506, second receiving trap 507, low frequency multiplying arrangement 508, phase detector 509.
First receiving device 506, for receive described to be reflected by the first reflecting surface 503 in light path first signal and outer light path first signal, and carry out mixing with mixed frequency signal respectively, export the signal after mixing.
Second receiving trap 507, for receiving by light path secondary signal in the second optical filter 505 and reflecting the outer light path secondary signal of turning back by measured target 510 and carry out opto-electronic conversion, and carries out mixing with mixed frequency signal respectively, exports the signal after mixing.
Embodiment four
The present embodiment provides a kind of calibrating installation of laser ranging, the calibrating installation of this laser ranging is based on two two laser ranging calibration stepss receiving double light path phase measurement, adopt the emitter that two-way is integrated, its structural principle as shown in Figure 5, for convenience of explanation, the present embodiment only provides the part relevant to the utility model embodiment.
The present embodiment provides based on two two electrical block diagrams receiving the laser ranging calibrating installation of double light path phase measurement, phaselocked loop 601 and driving circuit 602 drive emitter 603 to launch light wave according to high-frequency oscillation signal, the first light wave of launching is received for first receiving device 605 by the first reflecting surface 604, as outer light path first signal, the first light wave do not reflected by the first reflecting surface 604, is received by the second receiving trap 608 after being turned back by measured target as outer light path secondary signal by the first optical filter 606 transmission; Then the second light wave that emitter 603 is launched receives as interior light path first signal by the first reflecting surface 604 for first receiving device 605, received by the second receiving trap 608 by the second optical filter 607, as interior light path secondary signal after not reflected by the first optical filter 606 by the light wave that the first reflecting surface 604 reflects.The signal of interior light path, outer light path is received by first receiving device 605, second receiving trap 608 respectively and carries out opto-electronic conversion, mixing by biasing circuit 609 with from the high frequency mixed frequency signal that phaselocked loop 601 exports, and outputs to phase detector 611 after low-frequency amplifier 610 amplifies.Interior light path secondary signal, outer light path secondary signal and interior light path first signal, outer light path first signal are carried out phase compare by phase detector 611 respectively, export the inside and outside light path phase signal eliminating part of substrate reference, again light path, outer light path phase signal in the reference of elimination part of substrate are carried out phase compare, finally export the phase place of the substrate reference that is eliminated.
Embodiment five
The present embodiment provides a kind of surveying instrument of laser ranging, uses aforesaid laser ranging calibration steps and calibrating installation in the surveying instrument of this laser ranging.Owing to adopting two different wave lengths, in reflecting surface and corresponding two optical filters switch respectively, outer optical path signal, interior light path first signal is received respectively again by two signal receiving devices, outer light path first signal and interior light path secondary signal, outer light path secondary signal, interior light path and outer optical path signal carry out opto-electronic conversion, mixing, amplify and phase demodulation, export the signal of eliminating substrate thus avoid environmental change and introduce uncertain phase noise in circuit, and in being controlled by control circuit, outer light path switches thus the stable object realizing phase error compensation and calibration at a high speed, decrease the impact of environmental factor on range error, improve the measuring accuracy of laser ranging, add the range finding degree of stability of system, reduce the performance requirement of system to components and parts, thus reduce the cost of system, strengthen the application of laser ranging in every profession and trade.
Embodiment six
The present embodiment provides a kind of calibration example of laser ranging:
As shown in Figure 5, emitter 603 launches the first light wave of 650nm wavelength and the second light wave of 780nm wavelength, form outer light path first signal and interior light path first signal through the first reflecting surface 604, obtain outer light path first signal phase Ψ through mixing, amplification, phase demodulation
outer 1, interior light path first signal phase Ψ
interior 1, obtain outer light path secondary signal phase place Ψ by the outer light path secondary signal of the first optical filter 606 through mixing, amplification, phase demodulation
outer 2, obtain outer light path secondary signal phase place Ψ by light path secondary signal in the second optical filter 607 through mixing, amplification, phase demodulation
interior 2, the additional phase shift that the electronic signal that interior light path first signal, outer light path first signal Instrumental internal signal generator part produce produces in circuit transmission and photoelectric conversion process is Δ Ψ
1, interior light path secondary signal, outer light path the and additional phase shift that electronic signal that signal Instrumental internal signal generator part produces produces in circuit transmission and photoelectric conversion process is Δ Ψ
2, the signal phase that emitter produces is Ψ
send out, distance measuring signal first after through interior light path and the delayed phase differential of outer light path stroke be respectively Ψ
inand Ψ
outwardthen:
Ψ
interior 2=Δ Ψ
2+ Ψ
in+ Ψ
send out
Ψ
outer 2=Δ Ψ
2+ Ψ
outward+ Ψ
send out
Ψ
interior 1=Δ Ψ
1+ Ψ
send out
Ψ
outer 1=Δ Ψ
1+ Ψ
send out
Compare with interior light path first signal, outer light path first signal phase through interior light path secondary signal, outer light path secondary signal, eliminate laser tube do not mate and phase place that temperature causes is elegant and signal transmits and a part of additional phase shift of producing in photoelectric conversion process at the circuit of instrument internal:
Ф
in=Ψ
interior 2– Ψ
interior 1=Δ Ψ
2– Δ Ψ
1+ Ψ
in
Ф
outward=Ψ
outer 2– Ψ
outer 1=Δ Ψ
2– Δ Ψ
1+ Ψ
outward
In interior light path secondary signal, outer light path secondary signal export after comparing with interior light path first signal, outer light path first signal phase, optical path signal, outer optical path signal carry out phase compare again, the signal phase of the additional phase shift that the electronic signal that the instrument internal that is eliminated signal generating device produces produces in circuit transmission and photoelectric conversion process, the phase result namely measured is:
Ф=Ф
outward– Ф
in=(Δ Ψ
2– Δ Ψ
1+ Ψ
outward) – (Δ Ψ
2– Δ Ψ
1+ Ψ
in)=Ψ
outward– Ψ
in
Enumerate one group of data below:
Ψ
interior 1=30895 Ψ
interior 2=41411
Ψ
outer 1=14786 Ψ
outer 2=49446
Then: Ф
in=10516
Ф
outward=34660
Obtain: Ф=24144
Above-mentioned data just wherein one group, are on average finally measured phase place through too much group phase data, then by the calculating of algorithm, can obtain measuring distance is 1.672m.
The above is only preferred implementation of the present utility model; be not limited to the utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and modification, these improve and modification also should be considered as protection domain of the present utility model.
Claims (8)
1. a calibrating installation for laser ranging, is characterized in that, comprising:
Emitter, for generating according to high-frequency oscillation signal modulation the first light wave and the second light wave that also emission wavelength is different, wherein, a part for described first light wave is as outer light path first signal, as outer light path secondary signal after another part of described first light wave is turned back by measured target reflection, a part for described second light wave is as interior light path first signal, and another part of described second light wave is as interior light path secondary signal
First photoelectric conversion device, carries out opto-electronic conversion for receiving outer light path first signal and interior light path first signal respectively and exports respectively;
Second photoelectric conversion device, is reflected the outer light path secondary signal of turning back by measured target and interior light path secondary signal is carried out opto-electronic conversion and exports respectively for receiving respectively;
Phase detector, for receiving the signal that described first photoelectric conversion device and described second photoelectric conversion device export respectively, carrying out phase compare and exporting the phase signal eliminating substrate reference.
2. the calibrating installation of laser ranging according to claim 1, is characterized in that, also comprises:
Frequency mixer, for light path first signal, outer light path first signal in described first photoelectric conversion device output are carried out with same mixed frequency signal exporting described phase detector to after mixing is also amplified respectively, also for light path secondary signal, outer light path secondary signal in described second photoelectric conversion device output are carried out with same mixed frequency signal exporting described phase detector to after mixing is also amplified respectively.
3. the calibrating installation of laser ranging according to claim 2, it is characterized in that, described first photoelectric conversion device, the second photoelectric conversion device and described frequency mixer are contained in a receiving trap, and described receiving trap comprises photodiode, phototriode, avalanche diode or photomultiplier.
4. the calibrating installation of laser ranging according to claim 1, is characterized in that, also comprises:
Oscillator, for generation of and export described high-frequency oscillation signal and mixed frequency signal;
And/or
Multiplying arrangement, for receiving the output signal of described first photoelectric conversion device and the second photoelectric conversion device and carrying out amplifying, exporting.
5. the calibrating installation of laser ranging according to claim 1, is characterized in that, also comprises the first reflecting surface, the second reflecting surface, the first optical filter and the second optical filter, wherein:
First reflecting surface, for reflecting outer light path first signal and interior light path first signal to the first photoelectric conversion device;
First optical filter, for filtering outer light path secondary signal to measured target, and for reflecting interior light path secondary signal to the second photoelectric conversion device;
Second optical filter, is arranged between the first optical filter and the second photoelectric conversion device, and for filtering described interior light path secondary signal;
Second reflecting surface, be arranged on the second optical filter and and the second photoelectric conversion device between, and for reflecting described interior light path secondary signal to the second photoelectric conversion device.
6. the calibrating installation of laser ranging according to claim 5, it is characterized in that, described first reflecting surface and the second reflecting surface are optical reflection parts or optics light guide member, described optical reflection parts are reflecting prism, total reflective mirror or other possess the optical reflection parts of function of optical reflection, described optics light guide member is optical fiber, photoconductive tube or other possess the optics light guide member of optics light-guiding function, described first optical filter and the second optical filter are optical element, described optical element is optical glass coating, optical plastic plated film or other optical element possessing conducting and end optical path signal.
7. the calibrating installation of laser ranging according to claim 1, is characterized in that, described emitter is laser diode or the light emitting diode of launching one or more wavelength.
8. a surveying instrument for laser ranging, is characterized in that: the surveying instrument of described laser ranging comprises the calibrating installation of the laser ranging as described in any one of claim 1 to 7.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104122542A (en) * | 2014-07-30 | 2014-10-29 | 杜学璋 | Correcting method, correcting device and measuring apparatus for laser ranging |
| CN106903687A (en) * | 2017-01-18 | 2017-06-30 | 上海交通大学 | Industrial robot calibration system and method based on laser ranging |
| CN107124222A (en) * | 2017-04-20 | 2017-09-01 | 上海第二工业大学 | A kind of measurements of arrival time system and method for including two-way visible light communication link |
| CN108226907A (en) * | 2017-12-11 | 2018-06-29 | 武汉万集信息技术有限公司 | For the ranging calibration method and device of Laser Distance Measuring Equipment |
| CN108332780A (en) * | 2017-01-10 | 2018-07-27 | 派克汉尼芬公司 | The sensor calibration data memory module of optics power supply |
| CN109283547A (en) * | 2018-11-14 | 2019-01-29 | 成都昊图新创科技有限公司 | Laser Distance Measuring Equipment |
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2014
- 2014-07-30 CN CN201420426743.0U patent/CN204044355U/en not_active Ceased
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122542A (en) * | 2014-07-30 | 2014-10-29 | 杜学璋 | Correcting method, correcting device and measuring apparatus for laser ranging |
| CN108332780A (en) * | 2017-01-10 | 2018-07-27 | 派克汉尼芬公司 | The sensor calibration data memory module of optics power supply |
| CN106903687A (en) * | 2017-01-18 | 2017-06-30 | 上海交通大学 | Industrial robot calibration system and method based on laser ranging |
| CN107124222A (en) * | 2017-04-20 | 2017-09-01 | 上海第二工业大学 | A kind of measurements of arrival time system and method for including two-way visible light communication link |
| CN107124222B (en) * | 2017-04-20 | 2019-08-30 | 上海第二工业大学 | A kind of measurements of arrival time system and method comprising two-way visible light communication link |
| CN108226907A (en) * | 2017-12-11 | 2018-06-29 | 武汉万集信息技术有限公司 | For the ranging calibration method and device of Laser Distance Measuring Equipment |
| CN108226907B (en) * | 2017-12-11 | 2020-05-19 | 武汉万集信息技术有限公司 | Ranging calibration method and device for laser ranging equipment |
| CN109283547A (en) * | 2018-11-14 | 2019-01-29 | 成都昊图新创科技有限公司 | Laser Distance Measuring Equipment |
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