CN209640492U - A kind of novel phase type laser ranging system - Google Patents
A kind of novel phase type laser ranging system Download PDFInfo
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- CN209640492U CN209640492U CN201822083994.4U CN201822083994U CN209640492U CN 209640492 U CN209640492 U CN 209640492U CN 201822083994 U CN201822083994 U CN 201822083994U CN 209640492 U CN209640492 U CN 209640492U
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Abstract
The utility model discloses novel phase type laser ranging systems, including control unit, frequency synthesizer, DWDM driver circuits, single pole double throw analog switch, signal receiving unit and optical lens, frequency synthesizer exports main vibration signal and local oscillation signal simultaneously, is connected respectively with single pole double throw analog switch input terminal and signal receiving unit；When the first output end of single pole double throw analog switch is connected to DWDM driver circuits, for accessing main vibration signal modulation and emitting measuring beam, measuring beam photoelectric conversion is reflection signal and is mixed output distance measuring signal with local oscillation signal DWDM driver circuits by signal receiving unit；When the second output terminal of single pole double throw analog switch is connected to signal receiving unit, mixing outputting reference signal is carried out by main vibration signal and local oscillation signal that signal receiving unit accesses；Control unit successively handles the reference signal that signal receiving unit exports and distance measuring signal and carries out phase and relatively obtains phase difference and then calculate distance value.
Description
Technical field
The utility model relates to phase laser distance measurement technical field more particularly to a kind of novel phase laser distance measurement dresses
It sets.
Background technique
Currently, existing phase laser distance measurement is all made of semiconductor laser tube (LD) and avalanche diode (APD) composition
Transmitting and reception system, the phase shift rangefinder technical work principle of early stage is: passing through radio frequency with the transmitting of single semiconductor laser tube
The measuring beam of signal modulation exports interior optical path and outer optical path by the mechanical shutter switching of single-chip microcontroller control solenoid actuated respectively
Signal, interior optical path signal are used as reference signal by avalanche diode reception, and outer optical path signal is irradiated to target face, reflected light
Signal is used as distance measuring signal by avalanche diode reception, calculates the phase difference of reference signal and distance measuring signal to get going out
Distance value, this distance measuring method are known as single-shot list debit's case.Since there are service life and integrity problem, In for mechanical baffle
Extend two kinds of improvement projects on the basis of this, the first scheme is to increase optical path signal in a laser tube emissions, as benchmark
Signal, the outer optical path signal of another laser tube emissions is as distance measuring signal namely double bill debit cases；Another scheme is then to increase
Add an electric signal mixting circuit, substitutes interior optical path signal to obtain reference signal.No matter the phase type of which kind of scheme is used
Laser ranging requires a reference signal and is supplied to phase discriminator for doing phase bit comparison, uses interior optical path signal as benchmark
Signal, it is desirable that two laser tube characteristics of inside and outside optical path must be consistent, and just can guarantee measurement accuracy, but increase an interior optical path
Laser tube, optical system mechanism is also corresponding complicated while also increasing cost.And electrical signal mixer is used to generate reference signal,
It is same because electrical signal mixer and laser tube have a different temperature characterisitics, temperature change inevitably result in phase occur compared with
Large deviation leads to complex circuit designs in this way and increases cost to influence measurement accuracy.
Utility model content
The technical problem to be solved by the present invention is in view of the above drawbacks of the prior art, provide a kind of Novel photo
Position formula laser ranging system and method has nonlinear operation characteristic for avalanche diode, in addition to by receiving unit snowslide two
Pole pipe obtains outside distance measuring signal as optical signal frequency mixer, also creatively uses avalanche diode as RF mixer,
To obtain reference signal, because reference signal and distance measuring signal are generated by the same avalanche diode, preferably solve
Temperature drift problem, meets high precision measurement demand.
The technical scheme adopted by the utility model to solve the technical problem is as follows: providing a kind of novel phase laser distance measurement
Device, including for the control unit of control, frequency synthesizer, DWDM driver circuits, single pole double throw analog switch, signal
Receiving unit and optical lens；Control unit and frequency synthesizer, single pole double throw analog switch, DWDM driver circuits and letter
Number receiving unit is connected；Frequency synthesizer is switched with single pole double throw analog and signal receiving unit is connected；
Frequency synthesizer is used for while generating and exporting main vibration signal fRFWith local oscillation signal fLO, main vibration signal fRFAnd local oscillator
Signal fLOFor the high-frequency signal with fixed frequency difference；Local oscillation signal fLOIt is sent to signal receiving unit；Main vibration signal fRFIt sends
The input terminal switched to single pole double throw analog；
When the first output end of single pole double throw analog switch is connected to DWDM driver circuits, main vibration signal fRFIt is connect
Enter to DWDM driver circuits, control unit control DWDM driver circuits are modulated and emit measuring beam to testee
And then reflex to optical lens；It is reflection that measuring beam after optical lens focuses is carried out photoelectric conversion by signal receiving unit
Signal fRF0, signal receiving unit will reflection signal fRF0With local oscillation signal fLOIt is mixed and exports distance measuring signal fDS；
When the second output terminal of single pole double throw analog switch is connected to signal receiving unit, signal receiving unit will be accessed
Main vibration signal fRFWith local oscillation signal fLOCarry out radiofrequency signal mixing and outputting reference signal fRS；
Control unit successively handles the reference signal f of signal receiving unit transmissionRSWith distance measuring signal fDS, and benchmark is believed
Number fRSWith distance measuring signal fDSIt carries out phase bit comparison and obtains phase difference, and then calculate the distance value of testee.
Preferably, distance measuring signal fDSWith reference signal fRSIt is difference frequency signal；
Distance measuring signal fDS=reflection signal fRFO—Local oscillation signal fLO；
Reference signal fRS=main vibration signal fRF—Local oscillation signal fLO；
Distance measuring signal fDSWith reference signal fRSIt is that frequency is identical, and has dephased low frequency signal.
Preferably, signal receiving unit is avalanche diode, and avalanche diode includes the pole P, the pole N and photosensitive area；
By main vibration signal f when the second output terminal of single pole double throw analog switch is extremely connected with the P of avalanche diodeRFThrough hilted broadsword
The second output terminal of double-throw analog switch is sent to the pole P of avalanche diode；Frequency synthesizer is extremely connected with the N of avalanche diode
By local oscillation signal fLOIt is sent to the pole N of avalanche diode；
Measuring beam reflexes to optical lens through testee, and is irradiated to avalanche diode after optical lens focuses
On photosensitive area, and photoelectric signal transformation is carried out as reflection signal fRFO。
Preferably, further include signal amplification circuit, signal amplification circuit setting signal receiving unit and control unit it
Between, the reference signal f for being exported to signal receiving unitRSWith distance measuring signal fDSAmplify processing；
Signal amplification circuit includes the Trans-impedance preamplifier being sequentially connected and frequency-selective filtering amplifier, preposition to amplify across resistance
Device is used for the reference signal f for exporting signal receiving unitRSWith distance measuring signal fDSBe converted to corresponding voltage signal, frequency-selecting filter
Twt amplifier is used to carry out frequency-selective filtering and signal gain amplifier to the voltage signal of input.
It preferably, further include the temperature-compensating high-tension circuit being connected with avalanche diode；Temperature-compensating high-tension circuit is used for
When the temperature change of avalanche diode, the biasing of the temperature compensation coefficient control compensation avalanche diode according to avalanche diode
Voltage to guarantee the stable gain factor of avalanche diode, and then guarantees the signal stabilization of avalanche diode output.
Preferably, control unit further includes the ADC sample circuit and phase discriminator being sequentially connected, reference signal fRSBelieve with ranging
Number fDSADC sample circuit is input to after signal amplification circuit enhanced processing, ADC sample circuit is input to phase demodulation after being sampled
Device, phase discriminator carry out phase bit comparison and obtain phase difference.
Preferably, frequency synthesizer is phase-locked loop frequency synthesizer, direct digital synthesiser or clock generator.
Another aspect according to the present utility model also provides a kind of novel phase type laser distance measurement method, by using upper
The novel phase type laser ranging system stated carries out laser ranging, and specific steps include:
S10: frequency synthesizer generates simultaneously and exports main vibration signal fRFWith local oscillation signal fLO, main vibration signal fRFAnd local oscillator
Signal fLOFor the high-frequency signal with fixed frequency difference；Local oscillation signal fLOIt is sent to signal receiving unit, main vibration signal fRFInput
The input terminal switched to single pole double throw analog；
S20: main vibration signal fRFThe second output terminal switched through single pole double throw analog is sent to signal receiving unit, and with this
Shake signal fLOOutputting reference signal f after being mixedRS；
S30: main vibration signal fRFThe first output end switched through single pole double throw analog is sent to DWDM driver circuits, makes
It modulates and emits measuring beam, and measuring beam is irradiated to testee and then reflexes to optical lens；
S40: it is reflection that the measuring beam after optical lens focuses of access is carried out photoelectric conversion by signal receiving unit
Signal fRF0, signal f will be reflectedRF0With local oscillation signal fLODistance measuring signal f is exported after being mixedDS；
S50: signal receiving unit is sequentially output reference signal fRSWith distance measuring signal fDS；
S60: control unit successively handles the reference signal f of signal receiving unit transmissionRSWith distance measuring signal fDS, and by base
Calibration signal fRSWith distance measuring signal fDSIt carries out phase bit comparison and obtains phase difference, and then obtain the distance value of testee.
Preferably, distance measuring signal fDSWith reference signal fRSIt is difference frequency signal；Distance measuring signal fDS=reflection signal fRFO—This
Shake signal fLO；The reference signal fRS=main vibration signal fRF—Local oscillation signal fLO；Distance measuring signal fDSWith reference signal fRSIt is frequency
It is identical, and have dephased low frequency signal.
Preferably, step S50: the successive outputting reference signal f of signal receiving unitRSWith distance measuring signal fDS, it specifically includes:
By reference signal fRSWith distance measuring signal fDSControl unit is sent to after amplifying processing.
Preferably, step S60: control unit will handle the reference signal f of signal receiving unit transmissionRSAnd distance measuring signal
fDS, and by reference signal fRSWith distance measuring signal fDSIt carries out phase bit comparison and obtains phase difference, specifically include:
To amplified reference signal fRSWith distance measuring signal fDSCarry out ADC sampling；
To the reference signal f after samplingRSWith distance measuring signal fDSIt carries out phase bit comparison and obtains phase difference.
The technical solution for implementing the novel phase type laser ranging system of the utility model and method, has the following advantages that or has
Beneficial effect: the utility model utilizes the nonlinear characteristic (i.e. radiofrequency characteristics) of avalanche diode, because it is with lesser PN junction electricity
Hold the cutoff frequency of (about 1pF or so) and up to 3GHz, further expands avalanche diode application scope, avalanche diode is removed
It is used as photoelectric signal transformation and receives outer, can also be used as RF mixer, be equivalent to single-ended diode mixer circuit, and base
Calibration signal fRSWith distance measuring signal fDSIt is all the difference frequency signal being mixed by avalanche diode, and two signals are again all by same
Level-one Trans-impedance preamplifier and frequency-selective filtering amplifier be sent to phase discriminator phase demodulation sampling, therefore be substantially negligible due to
Two paths of signals phase error, greatly improves measurement accuracy and stability caused by component discreteness.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical solution of the utility model embodiment
The attached drawing used is briefly described, it is therefore apparent that and the drawings in the following description are merely some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings, in attached drawing:
Fig. 1 is the structural schematic diagram of the novel phase type laser ranging system embodiment of the utility model；
Fig. 2 is the control unit schematic diagram of the novel phase type laser ranging system embodiment of the utility model；
Fig. 3 is the circuit diagram of the novel phase type laser ranging system embodiment of the utility model；
Fig. 4 is the method flow diagram of the novel phase type laser distance measurement method embodiment of the utility model.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, what be will be described below is various
Embodiment will refer to corresponding attached drawing, these attached drawings constitute a part of embodiment, and which describe realize that this is practical new
The various embodiments that type may use.It should be appreciated that other embodiments also can be used, or embodiment enumerated herein is carried out
Modification structurally and functionally, without departing from the scope of the utility model and essence.In other cases, it omits to many institute's weeks
The detailed description of the system, apparatus, circuit and method known, in case unnecessary details interferes the description of the utility model.
In order to illustrate the technical solution of the utility model, the following is a description of specific embodiments.
The signal of the novel phase type laser ranging system of the utility model and embodiment of the method offer is provided picture 1-4
Figure, for ease of description, illustrates only part relevant to the utility model embodiment.The novel phase type laser of the utility model
Range unit include the control unit for control, frequency synthesizer, DWDM driver circuits, single pole double throw analog switch,
Signal receiving unit and optical lens；Control unit and frequency synthesizer, single pole double throw analog switch, DWDM driver circuits
And signal receiving unit is connected；Frequency synthesizer is switched with single pole double throw analog and signal receiving unit is connected.Specifically, single
The input terminal of dpdt double-pole double-throw (DPDT) analog switch is connected with frequency synthesizer, the first output end and Laser Modulation of single pole double throw analog switch
Driving circuit is connected, and the second output terminal of single pole double throw analog switch is connected with signal receiving unit.Frequency synthesizer is for same
When generate and export main vibration signal fRFWith local oscillation signal fLO, main vibration signal fRFWith local oscillation signal fLOFor with fixed frequency difference
High-frequency signal, wherein local oscillation signal fLOIt is sent to signal receiving unit；Main vibration signal fRFIt is sent to single pole double throw analog switch
Input terminal.
When the first output end of single pole double throw analog switch is connected to DWDM driver circuits, main vibration signal fRFIt is connect
Enter DWDM driver circuits, control unit control DWDM driver circuits modulate and emit measuring beam to testee into
And reflex to optical lens；It is reflection letter that measuring beam after optical lens focuses is carried out photoelectric conversion by signal receiving unit
Number fRF0, signal receiving unit will reflection signal fRF0With local oscillation signal fLOIt is mixed and exports distance measuring signal fDS, ranging letter
Number fDSFor difference frequency signal；Specifically, measuring beam is irradiated to signal receiving unit avalanche diode after optical lens focuses
On photosensitive area, and photoelectric signal transformation is carried out as reflection signal fRF0, signal receiving unit will reflection signal fRF0With local oscillation signal
fLOIt is mixed and exports distance measuring signal fDS, therefore, the distance measuring signal fDS=reflection signal fRFO—Local oscillation signal fLO, ranging
Signal fDS=fRFO-fLO。
When the second output terminal of single pole double throw analog switch is connected to signal receiving unit, control unit simultaneously closes off sharp
Light modulation driving circuit, signal receiving unit (i.e. avalanche diode) is by the main vibration signal f of accessRFWith local oscillation signal fLOIt carries out
It is mixed and exports difference frequency signal, the reference signal f as measurementRS, reference signal fRSIt is main vibration signal fRFWith local oscillation signal fLOIt penetrates
Frequency signal is mixed the difference frequency signal obtained, the reference signal fRS=main vibration signal fRF—Local oscillation signal fLO, i.e. fRS=fRF-fLO。
More specifically, the distance measuring signal fDSWith reference signal fRSIt is difference frequency signal, distance measuring signal fDSWith reference signal fRSIt is frequency
It is identical, and have dephased low frequency signal.
In the present embodiment, control unit successively handles the reference signal f that signal receiving unit is sent through amplificationRSAnd ranging
Signal fDS, and by reference signal fRSWith distance measuring signal fDSIt carries out phase bit comparison and obtains phase difference, and then calculate testee
Distance value.Specifically, chip of the control unit using STMicw Electronics STM32 series, as STM32F0, STM32F1,
STMF3 etc. is also possible to other company's different series chips, is not specifically limited herein.Specifically, control unit is also used to control
Frequency synthesizer, single pole double throw analog switch, DWDM driver circuits and signal receiving unit processed etc., wherein control unit
Control frequency synthesizer generates simultaneously and exports main vibration signal fRFWith local oscillation signal fLO, control unit control single pole double throw analog
Switch the first output end be connected to DWDM driver circuits, or control single pole double throw analog switch second output terminal and
Signal receiving unit connection.
In the present embodiment, when the output end of single pole double throw analog switch is connected to DWDM driver circuits, control
Unit controls the main vibration signal f of frequency synthesizerRFDWDM driver circuits are sent to, and control DWDM driver circuits modulation
And emit measuring beam to testee, which reflexes to optical lens；Optical lens is by the measurement light
Beam be focused after be irradiated on the photosensitive area of avalanche diode, signal receiving unit carry out photoelectric signal transformation be reflection letter
Number fRF0, signal receiving unit will reflection signal fRF0With local oscillation signal fLODistance measuring signal f is exported after being mixedDS；When hilted broadsword is double
When throwing the output end of analog switch and being connected to signal receiving unit, signal receiving unit is by the main vibration signal f of accessRFBelieve with local oscillator
Number fLOOutputting reference signal f after being mixedRS；Control unit successively handles the reference signal f of signal receiving unit outputRSWith
Distance measuring signal fDS, and by reference signal fRSWith distance measuring signal fDSIt carries out phase bit comparison and obtains phase difference, and then calculate measured object
The distance value of body.
In the present embodiment, signal receiving unit is preferably avalanche diode APD, avalanche diode include the pole P (anode),
The pole N (cathode) and photosensitive area；Specifically, the second output terminal of single pole double throw analog switch is by control unit control and two pole of snowslide
The P of pipe is extremely connected, main vibration signal fRFThe second output terminal switched through single pole double throw analog is sent to the pole P of avalanche diode；Frequently
Rate synthesizer is extremely connected with the N of avalanche diode for accessing local oscillation signal fLO；Measuring beam reflexes to optics through testee
Lens, and on the photosensitive area for being irradiated to avalanche diode after optical lens focuses, and photoelectric signal transformation is carried out as reflection letter
Number fRF0.Specifically, photosensitive area (Active area) is used to receive the reflected light (measuring beam) after optical lens focuses, more
Body, signal receiving unit can also use photodiode (PIN), not do specific restriction one by one herein.
In the present embodiment, novel phase type laser ranging system further includes signal amplification circuit, and signal amplification circuit is set
It sets between signal receiving unit and control unit, the reference signal f for being exported to signal receiving unitRSAnd distance measuring signal
fDSAmplify processing；Specifically, signal amplification circuit includes the Trans-impedance preamplifier being sequentially connected and frequency-selective filtering amplification
Device, the reference signal f that Trans-impedance preamplifier exports signal receiving unitRSWith distance measuring signal fDS(current signal) is converted to
Corresponding voltage signal, at the same the high-gain of negative-feedback can be provided to the input terminal of frequency-selective filtering amplifier, high impedance is put
Big signal, frequency-selective filtering amplifier carries out frequency-selective filtering again to the voltage signal that Trans-impedance preamplifier inputs and signal amplifies
Gain.
Specifically, further including the temperature-compensating high-tension circuit being connected with avalanche diode, temperature-compensating high-tension circuit is used for
When the temperature change of avalanche diode, the biasing of the temperature compensation coefficient control compensation avalanche diode according to avalanche diode
Voltage to guarantee the stable gain factor of avalanche diode, and then guarantees the stabilization for the signal that avalanche diode exports certain
Range.If for signal with regard to fewer and fewer, temperature reduces signal with regard to increasing or even full after temperature increases without temperature-compensating
With, temperature-compensating is exactly the high pressure for compensating APD, guarantee stability.Because the variation of environment temperature is to the shadow of avalanche diode
Sound is especially big, is caused the voltage change inside it by the variation of temperature after avalanche diode, therefore, it is high that temperature-compensating is added
Volt circuit can compensate corresponding voltage to avalanche diode at different temperatures, so as to improve avalanche diode to reception signal
Stability.
Specifically, control unit further includes the ADC sample circuit and phase discriminator being sequentially connected, reference signal fRSBelieve with ranging
Number fDSADC sample circuit is input to after being amplified by signal amplification circuit, ADC sample circuit is sent to phase discriminator after being sampled,
Phase discriminator carries out phase bit comparison and obtains phase difference.
Specifically, frequency synthesizer is phase-locked loop frequency synthesizer, direct digital synthesiser or clock generator, pass through control
The control of unit processed can produce two-way high-frequency signal, i.e., main vibration signal fRFWith local oscillation signal fLO。
Specifically, DWDM driver circuits include semiconductor laser tube and DWDM driver circuits, corresponding, optics
Lens include lens group and narrow band filter, improve the detectivity to low light signals by increasing optics receiving area.
In the present embodiment, the circuit diagram of the novel phase type laser ranging system can refer to Fig. 3, and the U1 in circuit diagram is
Frequency synthesizer, the SCL pin and SDA pin of frequency synthesizer U1 are used to the control signal that reception control unit is sent, frequency
The Y1 pin of synthesizer U1 exports main vibration signal fRFIt is sent to U2 single pole double throw analog switch input A pin, frequency synthesizer U1
Y2 pin export local oscillation signal fLOThe pole N of D1 avalanche diode APD is sent to through resistance R1 and capacitor C1；U2 in circuit diagram
As single pole double throw analog switchs, and the SEL pin of single pole double throw analog switch U2 is used to the MCU_ that reception control unit is sent
SWITCH controls signal, respectively by main vibration signal fRFLD Laser Modulation is sent to through resistance R10 and capacitor C6 by B1 pin to drive
Dynamic circuit or the pole P for being sent to D1 avalanche diode APD through resistance R2 and capacitor R2 by B0 pin；The LD laser two of circuit diagram
Pole pipe D2, triode Q1/Q2, capacitor C5, resistance R8/R9 constitute DWDM driver circuits, and control unit passes through MCU_LD_ON
The transmission that opens or closes brewed measuring beam of the pin through resistance R9 control laser tube LD；APD in circuit diagram is corresponded to
Signal receiving unit, APD_HV pin are that temperature-compensating high-tension circuit accesses pin, and the pole N of APD, APD are input to through resistance R3
The pole P outputting reference signal fRSWith distance measuring signal fDSBy the signal amplification electricity being made of U3, resistance R5/R6/R7 and capacitor C4
Road amplifies, and control unit processing is sent to after being exported by SIG_OUT pin to the amplification of rear class amplifying circuit.
The utility model also provides a kind of novel phase type laser distance measurement method embodiment, using above-mentioned novel phase type
Laser ranging system, specific steps include:
S10: frequency synthesizer generates simultaneously and exports main vibration signal fRFWith local oscillation signal fLO, the main vibration signal fRFWith
Local oscillation signal fLOFor the high-frequency signal with fixed frequency difference；Local oscillation signal fLOIt is sent to signal receiving unit (i.e. two pole of snowslide
The pole N of pipe), main vibration signal fRFIt is sent to the input terminal of single pole double throw analog switch；
S20: main vibration signal fRFThe second output terminal (being controlled by control unit) switched through single pole double throw analog is sent to letter
Number receiving unit (i.e. the pole P of avalanche diode), and with local oscillation signal fLOOutputting reference signal f after being mixedRS；
S30: main vibration signal fRFThe first output end (being controlled by control unit) switched through single pole double throw analog is sent to sharp
Light modulation driving circuit modulates it and emits measuring beam, and measuring beam is irradiated to testee and then reflexes to optical lens
Mirror；Optical lens emits after being focused the measuring beam of reflection to signal receiving unit；
S40: it is reflection that the measuring beam after optical lens focuses of access is carried out photoelectric conversion by signal receiving unit
Signal fRF0, signal f will be reflectedRF0With local oscillation signal fLODistance measuring signal f is exported after being mixedDS；
S50: signal receiving unit is sequentially output reference signal fRSWith distance measuring signal fDS；
S60: control unit successively handles the reference signal f of signal receiving unit transmissionRSWith distance measuring signal fDS, and by base
Calibration signal fRSWith distance measuring signal fDSIt carries out phase bit comparison and obtains phase difference, and then obtain the distance value of testee.
Specifically, step S50: signal receiving unit is sequentially output reference signal fRSWith distance measuring signal fDS, it specifically includes:
By reference signal fRSWith distance measuring signal fDSControl unit is sent to after amplifying processing.
Specifically, step S60: control unit will successively handle the reference signal f of signal receiving unit transmissionRSBelieve with ranging
Number fDS, and by reference signal fRSWith distance measuring signal fDSIt carries out phase bit comparison and obtains phase difference, specifically include:
To amplified reference signal fRSWith distance measuring signal fDSCarry out ADC sampling；
To the reference signal f after samplingRSWith distance measuring signal fDSIt carries out phase bit comparison and obtains phase difference.
Specifically, wherein step S20 and step S30, S40 can also carry out replacement sequence, distance measuring signal can be first measured
fDSMeasuring basis signal f againRS。
The novel phase type laser distance measurement method embodiment of the utility model content identical with device is detailed in Installation practice,
It is not further detailed in this section.
The novel phase type laser ranging system of the utility model and method (are penetrated using the nonlinear characteristic of avalanche diode
Frequency characteristic), because of its cutoff frequency with lesser capacitance of PN junction (about 1pF or so) and up to 3GHz, further expand snowslide
Diode applications scope can also be used by avalanche diode other than being used as opto-electronic receiver signal as RF mixer, equivalent
In single-ended diode mixer circuit, and reference signal fRSWith distance measuring signal fDSIt is all the difference frequency being mixed by avalanche diode
Signal, and two signals are all adopted by being sent to phase discriminator phase demodulation with level-one Trans-impedance preamplifier and frequency-selective filtering amplifier again
Therefore sample is substantially negligible the two paths of signals phase error as caused by component discreteness, greatly improves measurement
Precision, stability are high.Due to not needing to increase a laser tube or dedicated electric signal mixting circuit, the novel phase type laser
The circuit structure of range unit is simple, and cost is relatively low, and simplifies optical texture design.
The above is only the preferred embodiments of the present utility model only, and those skilled in the art know, practical not departing from
In the case where novel spirit and scope, various changes or equivalent replacement can be carried out to these features and embodiment.In addition, In
Under the introduction of the utility model, can modify to these features and embodiment with adapt to particular situation and material without
It is detached from the spirit and scope of the utility model.Therefore, the utility model is not limited to the particular embodiment disclosed, institute
The embodiment fallen within the scope of claims hereof belongs to the protection scope of the utility model.
Claims (6)
1. a kind of novel phase type laser ranging system, including being driven for the control unit of control, frequency synthesizer, Laser Modulation
Dynamic circuit, signal receiving unit and optical lens；Described control unit and the frequency synthesizer, Laser Modulation driving electricity
Road is connected；
The frequency synthesizer is used for while generating and exporting main vibration signal fRFWith local oscillation signal fLO, the main vibration signal fRFWith
The local oscillation signal fLOFor the high-frequency signal with fixed frequency difference；
Described control unit successively handles the reference signal f that the signal receiving unit is sentRSWith distance measuring signal fDS, and will be described
Reference signal fRSWith the distance measuring signal fDSIt carries out phase bit comparison and obtains phase difference, and then calculate the distance value of testee；
Described control unit further includes the ADC sample circuit and phase discriminator being sequentially connected, the reference signal fRSWith the ranging
Signal fDSThe ADC sample circuit is input to after the signal amplification circuit enhanced processing, the ADC sample circuit is adopted
The phase discriminator is input to after sample, the phase discriminator carries out phase bit comparison and obtains phase difference；
It is characterized in that, further including single pole double throw analog switch, the signal receiving unit is avalanche diode；
Described control unit is switched with the single pole double throw analog, the signal receiving unit is connected；The frequency synthesizer with
The single pole double throw analog switch and the signal receiving unit are connected；
The local oscillation signal fLOIt is sent to the signal receiving unit；The main vibration signal fRFIt is sent to the single pole double throw analog
The input terminal of switch；
When the first output end of single pole double throw analog switch is connected to the DWDM driver circuits, the main vibration letter
Number fRFThe DWDM driver circuits are accessed to, it is concurrent that described control unit controls the DWDM driver circuits modulation
Measuring beam is penetrated to the testee and then reflexes to the optical lens；The signal receiving unit will be through the optical lens
Measuring beam after mirror focuses carries out photoelectric conversion as reflection signal fRF0, the signal receiving unit is by the reflection signal fRF0
With the local oscillation signal fLOIt is mixed and exports the distance measuring signal fDS；
When the second output terminal of single pole double throw analog switch is connected to the signal receiving unit, the signal receives single
Member is by the main vibration signal f of accessRFWith the local oscillation signal fLOIt carries out radiofrequency signal mixing and exports the reference signal
fRS。
2. novel phase type laser ranging system according to claim 1, which is characterized in that the distance measuring signal fDSAnd institute
State reference signal fRSIt is difference frequency signal；
The distance measuring signal fDS=reflection signal the fRFO—The local oscillation signal fLO；
The reference signal fRS=main vibration signal the fRF—The local oscillation signal fLO；
The distance measuring signal fDSWith the reference signal fRSIt is that frequency is identical, and has dephased low frequency signal.
3. novel phase type laser ranging system according to claim 1, which is characterized in that the avalanche diode includes
The pole P, the pole N and photosensitive area；
By the main vibration signal when second output terminal of the single pole double throw analog switch is extremely connected with the P of the avalanche diode
fRFThe second output terminal switched through the single pole double throw analog is sent to the pole P of the avalanche diode；The frequency synthesizer
Extremely it is connected with the N of the avalanche diode by the local oscillation signal fLOIt is sent to the pole N of the avalanche diode；
The measuring beam reflexes to the optical lens through the testee, and is irradiated to after optical lens focusing
On the photosensitive area of the avalanche diode, and carrying out photoelectric signal transformation is the reflection signal fRFO。
4. novel phase type laser ranging system according to claim 3, which is characterized in that further include signal amplification electricity
Road, the signal amplification circuit is arranged between the signal receiving unit and described control unit, for connecing to the signal
Receive the reference signal f of unit outputRSWith the distance measuring signal fDSAmplify processing；
The signal amplification circuit includes the Trans-impedance preamplifier being sequentially connected and frequency-selective filtering amplifier, described preposition across resistance
Amplifier is used for the reference signal f for exporting the signal receiving unitRSWith the distance measuring signal fDSIt is converted to corresponding
Voltage signal, the frequency-selective filtering amplifier is used to carry out frequency-selective filtering to the voltage signal of input and signal amplification increases
Benefit.
5. novel phase type laser ranging system according to claim 4, which is characterized in that further include and the snowslide two
The connected temperature-compensating high-tension circuit of pole pipe；
The temperature-compensating high-tension circuit is used for when the temperature change of the avalanche diode, according to the avalanche diode
Temperature compensation coefficient control compensates the bias voltage of the avalanche diode, to guarantee the avalanche diode stable gain times
Number, and then guarantee the signal stabilization of the avalanche diode output.
6. novel phase type laser ranging system according to claim 1, which is characterized in that the frequency synthesizer is lock
Phase ring frequency synthesizer, direct digital synthesiser or clock generator.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702986A (en) * | 2021-08-23 | 2021-11-26 | 欧姆龙(上海)有限公司 | Photoelectric detection device and method |
| CN116990826A (en) * | 2023-09-26 | 2023-11-03 | 北京航空航天大学 | High dynamic precision laser phase range finder |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702986A (en) * | 2021-08-23 | 2021-11-26 | 欧姆龙(上海)有限公司 | Photoelectric detection device and method |
| CN113702986B (en) * | 2021-08-23 | 2024-04-26 | 欧姆龙(上海)有限公司 | Photoelectric detection device and method |
| CN116990826A (en) * | 2023-09-26 | 2023-11-03 | 北京航空航天大学 | High dynamic precision laser phase range finder |
| CN116990826B (en) * | 2023-09-26 | 2023-12-12 | 北京航空航天大学 | High dynamic precision laser phase range finder |
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