CN208752200U - Laser pick-off circuit and range calibration equipment - Google Patents
Laser pick-off circuit and range calibration equipment Download PDFInfo
- Publication number
- CN208752200U CN208752200U CN201821343527.4U CN201821343527U CN208752200U CN 208752200 U CN208752200 U CN 208752200U CN 201821343527 U CN201821343527 U CN 201821343527U CN 208752200 U CN208752200 U CN 208752200U
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- operational amplifier
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/497—Means for monitoring or calibrating
Abstract
The utility model relates to photoelectric detection technology fields, and in particular to a kind of laser pick-off circuit and range calibration equipment.Range calibration equipment includes main transmitter and reference transmitter, laser pick-off circuit is applied to range calibration equipment, laser pick-off circuit includes photelectric receiver and frequency-selecting amplification lattice network, photelectric receiver is electrically connected with frequency-selecting amplification lattice network, photelectric receiver receives the first modulation laser of main transmitter transmitting and the second modulation laser of reference transmitter transmitting simultaneously to carry out Frequency mixing processing, and the modulation laser that Frequency mixing processing obtains is subjected to photoelectric conversion one current signal of generation and is sent to frequency-selecting amplification lattice network, frequency-selecting, which is amplified, to be obtained an intermediate-freuqncy signal after lattice network carries out frequency-selecting and enhanced processing to current signal and exports, and then the problem of circuit complexity is effectively relieved, and mixing quality and stability can be effectively improved.
Description
Technical field
The utility model relates to photoelectric detection technology fields, in particular to a kind of laser pick-off circuit and apart from school
Quasi- equipment.
Background technique
Signal mixing refers to using non-linear element, and the electric signal of two different frequencies is mixed, and is returned by frequency-selecting
Rood to third frequency signal process, currently, realize laser signal reception with being mixed when, need first to be respectively completed two
Then the photoelectric conversion of road laser signal realizes the mixing of electrical signal by mixing device again.
Inventor it has been investigated that, existing implementation is carried out photoelectric conversion respectively and is mixed due to signal needs
And there is a problem of circuit complexity, but also there is a problem of that mixing quality and stability control are more difficult.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of laser pick-off circuit and range calibration equipment, to have
Effect alleviates the situation of circuit complexity, and can effectively improve mixing quality and stability.
To achieve the above object, the utility model embodiment adopts the following technical scheme that
A kind of laser pick-off circuit, it is described to swash applied to the range calibration equipment including main transmitter and reference transmitter
Optical receiving circuit includes photelectric receiver and frequency-selecting amplification lattice network, and the photelectric receiver and frequency-selecting amplification network are electric
Road electrical connection；
The photelectric receiver receives the first modulation laser and the reference transmitter of the main transmitter transmitting simultaneously
Second modulation laser of transmitting is to carry out Frequency mixing processing, and the modulation laser that Frequency mixing processing is obtained carries out photoelectric conversion and generates one
Current signal is simultaneously sent to the frequency-selecting amplification lattice network, and the frequency-selecting amplification lattice network selects the current signal
An intermediate-freuqncy signal is obtained after frequency and enhanced processing and is exported.
Optionally, in above-mentioned laser pick-off circuit, the frequency-selecting amplification lattice network includes level-one selective frequency amplifier circuit
With second level selective frequency amplifier circuit, the level-one selective frequency amplifier circuit is connected to the photelectric receiver and the second level frequency-selecting is amplified
Between circuit；
The level-one selective frequency amplifier circuit receives the current signal that the photelectric receiver is sent and carries out at frequency-selecting and amplification
The first intermediate-freuqncy signal is obtained after reason and is sent to the second level selective frequency amplifier circuit, and the second level selective frequency amplifier circuit is to described
One intermediate-freuqncy signal obtains the second intermediate-freuqncy signal after carrying out frequency-selecting and enhanced processing and exports.
Optionally, in above-mentioned laser pick-off circuit, the level-one selective frequency amplifier circuit includes first resistor, the second electricity
Resistance, the first operational amplifier, first capacitor, the second capacitor and third capacitor, the first resistor are connected to the photoelectricity and connect
Receive device output end and first operational amplifier out-phase input terminal between, the out-phase input terminal of the first operational amplifier with
Power supply connection, output end are connect with the input terminal of the second level selective frequency amplifier circuit, and one end of the first capacitor is connected to light
Between the output end and first resistor of electric receiver, the other end ground connection, one end of second capacitor be connected to it is described first electricity
It hinders between the out-phase input terminal of first operational amplifier, the other end is grounded, the second resistance and the third capacitor
It is connected to after parallel connection between the output end and out-phase input terminal of first operational amplifier.
Optionally, in above-mentioned laser pick-off circuit, the second level selective frequency amplifier circuit includes the 4th capacitor, the 5th electricity
Appearance, the 6th capacitor, second operational amplifier, 3rd resistor, the 4th resistance and the 5th resistance, the first end of the 4th capacitor
It is connect with the output end of first operational amplifier, the first end that second end passes through the 3rd resistor and the 5th capacitor
Connection, the second end of the 5th capacitor are connect with the out-phase input terminal of the second operational amplifier, and second operation is put
The non-inverting input terminal of big device is connect with the power supply, and the 4th resistance is connected to the out-phase input of the second operational amplifier
Between end and output end, the out-phase input terminal of the first end of the 6th capacitor and the second operational amplifier, second end with
The first end of 5th capacitor connects, one end of the 5th resistance be connected to the 3rd resistor and the 5th capacitor it
Between, the other end ground connection.
Optionally, in above-mentioned laser pick-off circuit, the laser pick-off circuit further includes reference voltage circuit, the ginseng
Examine potential circuit be set to the power supply and first operational amplifier non-inverting input terminal and second operational amplifier it is same
Between phase input terminal.
Optionally, in above-mentioned laser pick-off circuit, the reference voltage circuit includes the 6th resistance, the 7th resistance, the
Seven capacitors and the 8th capacitor, one end of the 6th resistance connect with the power supply, the other end respectively with first operation
The non-inverting input terminal of amplifier is connected with the non-inverting input terminal of second operational amplifier, one end of the 7th resistance and described the
One end that six resistance are connect with the non-inverting input terminal of first operational amplifier connects, the other end is grounded, the 7th capacitor
One end connect with the non-inverting input terminal of the 6th resistance and first operational amplifier one end connection, another termination
Ground, one end that one end of the 8th capacitor is connect with the non-inverting input terminal of the 6th resistance and first operational amplifier
Connection, other end ground connection.
Optionally, in above-mentioned laser pick-off circuit, the range calibration equipment further includes processor, the laser pick-off
Circuit further includes overload observation circuit, and the overload observation circuit includes the 8th resistance and the 9th capacitor, the 8th resistance
One end is connect with the output end of first operational amplifier, the other end is connected to ground by the 9th capacitor, and the described 8th
Resistance and one end of the 9th capacitance connection are also connected to the processor.
Optionally, in above-mentioned laser pick-off circuit, the photelectric receiver includes photoelectricity avalanche diode, the photoelectricity
The cathode of avalanche diode is connect with power circuit, anode is connect with the input terminal of frequency-selecting amplification lattice network.
Optionally, in above-mentioned laser pick-off circuit, the photelectric receiver further includes the 9th resistance, the photoelectricity snowslide
The cathode of diode is connect by the 9th resistance with the power circuit, and the power circuit is hvdc circuit.
The utility model also provides a kind of range calibration equipment, comprising: main transmitter, reference transmitter, processor and
Above-mentioned laser pick-off circuit, the laser pick-off circuit include photelectric receiver and frequency-selecting amplification lattice network, the photoelectricity
Receiver is electrically connected with frequency-selecting amplification lattice network, and the frequency-selecting amplification lattice network is electrically connected with the processor；
The main transmitter is used for the first modulation laser of object to be measured transmitting and reflexes to institute by the object to be measured
State photelectric receiver；
The reference transmitter is used for the second modulation of transmitting while the main transmitter emits the first high frequency modulated light
Laser is to the photelectric receiver；
The photelectric receiver is used for while receiving the first modulation laser and the second modulation laser carries out photoelectricity
Conversion generates a current signal and is sent to the frequency-selecting amplification lattice network, and the frequency-selecting amplification lattice network is to the electric current
Signal obtains an intermediate-freuqncy signal after carrying out frequency-selecting and enhanced processing and exports to the processor；
The processor is used to carry out phase analysis according to the intermediate-freuqncy signal to obtain a distance value.
Laser pick-off circuit provided by the utility model and range calibration equipment, laser pick-off circuit include photelectric receiver
Amplify lattice network with frequency-selecting, photelectric receiver is electrically connected with frequency-selecting amplification lattice network, and photelectric receiver receives main hair simultaneously
First modulation laser of emitter transmitting and the second of reference transmitter transmitting modulate laser to carry out Frequency mixing processing, and will be at mixing
It manages obtained modulation laser to carry out photoelectric conversion one current signal of generation and be sent to frequency-selecting amplification lattice network, net is amplified in frequency-selecting
Network circuit obtains an intermediate-freuqncy signal after carrying out frequency-selecting and enhanced processing to current signal and exports, and then circuit complexity is effectively relieved
The problem of, and mixing quality and stability can be effectively improved.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only the section Example of the utility model, therefore should not be by
Regard the restriction to scope of protection of the utility model as, for those of ordinary skill in the art, does not pay creative labor
Under the premise of dynamic, it can also be obtained according to these attached drawings other relevant attached drawings.
Fig. 1 is a kind of structural schematic diagram of range calibration equipment provided by the embodiment of the utility model.
Fig. 2 is a kind of connection block diagram of laser pick-off circuit provided by the embodiment of the utility model.
Fig. 3 is a kind of circuit diagram of laser pick-off circuit provided by the embodiment of the utility model.
Fig. 4 is a kind of another circuit diagram of laser pick-off circuit provided by the embodiment of the utility model.
Icon: 10- range calibration equipment；30- object to be measured；100- laser pick-off circuit；110- photelectric receiver；130-
Lattice network is amplified in frequency-selecting；131- level-one selective frequency amplifier circuit；133- second level selective frequency amplifier circuit；150- reference voltage circuit；
170- overloads observation circuit；D1- photoelectricity avalanche diode；The first operational amplifier of A1-；A2- second operational amplifier；R1-
One resistance；R2- second resistance；R3- 3rd resistor；The 4th resistance of R4-；The 5th resistance of R5-；The 6th resistance of R6-；The 7th electricity of R7-
Resistance；The 8th resistance of R8-；The 9th resistance of R9-；C1- first capacitor；The second capacitor of C2-；C3- third capacitor；The 4th capacitor of C4-；
The 5th capacitor of C5-；The 6th capacitor of C6-；The 7th capacitor of C7-；The 8th capacitor of C8-；The 9th capacitor of C9-；The main transmitter of 200-；300-
Reference transmitter；400- processor.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment is applied the technical solution in example to the utility model and is clearly and completely described, it is clear that is described
Embodiment be the utility model a part of the embodiment, instead of all the embodiments.Usually describes and show in attached drawing here
The component of the utility model embodiment out can be arranged and be designed with a variety of different configurations.
Therefore, requirement is not intended to limit to the detailed description of the embodiments of the present invention provided in the accompanying drawings below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the range of the utility model protection.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is set
Set ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in utility model.
As shown in Figure 1, a kind of range calibration equipment 10 provided by the embodiment of the utility model, including laser pick-off circuit
100, main transmitter 200, reference transmitter 300 and processor 400, the laser pick-off circuit 100 and the processor 400
Electrical connection.
Using above-mentioned range calibration equipment 10 measure main transmitter 200 between object to be measured 30 at a distance from when: institute
It is described sharp for reflexing to first modulation laser of the transmitting of object to be measured 30 and by the object to be measured 30 to state main transmitter 200
Optical receiving circuit 100.The reference transmitter 300 is used to send out while main first modulation of the transmitting of transmitter 200 laser
The second modulation laser is penetrated to the laser pick-off circuit 100.The laser pick-off circuit 100 is used for while receiving first tune
Laser processed and described second modulates laser and obtains an intermediate-freuqncy signal after being handled and export to the processor 400.It is described
Processor 400 is used to carry out phase analysis according to the intermediate-freuqncy signal to obtain a distance value.
Wherein, controlling the main transmitter 200 and reference transmitter 300 mode luminous simultaneously can be in the processing
One switch of connection between device 400 and the reference transmitter 300, makes the main transmitter in switch conduction to realize simultaneously
200 and reference transmitter 300 shine；Be also possible to the main transmitter 200 and reference transmitter 300 respectively with the processor
400 electrical connections, so that the processor 400 controls the main transmitter 200 and reference transmitter 300 while shining, according to reality
Border demand is configured, and is not specifically limited herein.
Incorporated by reference to Fig. 2, the utility model provides a kind of laser pick-off circuit that can be applied to above-mentioned range calibration equipment 10
100, the laser pick-off circuit 100 includes that lattice network 130, the photelectric receiver are amplified in photelectric receiver 110 and frequency-selecting
110 are electrically connected with frequency-selecting amplification lattice network 130.
Specifically, the photelectric receiver 110 receives the first modulation laser and institute that the main transmitter 200 emits simultaneously
The second modulation laser of the transmitting of reference transmitter 300 is stated to carry out Frequency mixing processing, and the modulation laser that Frequency mixing processing is obtained into
Row photoelectric conversion generates a current signal and is sent to the frequency-selecting amplification lattice network 130, and lattice network is amplified in the frequency-selecting
130 pairs of current signals obtain an intermediate-freuqncy signal after carrying out frequency-selecting and enhanced processing and export.
By above-mentioned setting, need first to divide in the prior art when carrying out mixing and photoelectric conversion, effectively to avoid using
Not Wan Cheng two-way laser signal photoelectric conversion, circuit caused by the mixing of electrical signal is then realized by mixing device again
Complicated problem, in addition, mixing quality and stability can also be effectively improved by above-mentioned setting.
Specifically, by the way that laser pick-off circuit 100 is applied to above-mentioned range calibration equipment 10, and measuring master
When the distance between transmitter 200 and object to be measured 30, makes the main transmitter 200 and reference transmitter 300 while transmitting swashs
Light, and the laser that main transmitter 200 and reference transmitter 300 issue is received using the photelectric receiver 110 simultaneously, so that because
Phase drift caused by the environmental factors such as temperature, humidity is cancelled out each other.Further, due to the first modulation laser and the second modulation
Laser shares a photelectric receiver 110, therefore the phase of laser pick-off circuit 100 is floated for measurement loop and reference loop
Shifting is also cancelled out each other, and special main transmitter 200 is worked at the same time with reference transmitter 300, therefore environmental factor bring is sensitive
The compensation of device phase drift is more accurate, in addition, carrying out frequency-selecting and amplification by using frequency-selecting amplification lattice network 130 with into one
Step improves measurement efficiency and measurement stability is higher, and measurement performance is more excellent, and then makes to survey by the range calibration equipment 10
The distance value obtained is more accurate.
Wherein, the photelectric receiver 110 can be PIN type photodiode, photoelectricity avalanche diode or photomultiplier transit
Pipe etc. carries out photoelectric conversion to the first modulation laser and the second modulation laser while being mixed i.e. as long as can be realized
Can, it is not specifically limited herein.
Incorporated by reference to Fig. 3, optionally, in the present embodiment, the photelectric receiver 110 includes photoelectricity avalanche diode D1,
The cathode of the photoelectricity avalanche diode D1 is connect with power circuit, anode amplifies the input of lattice network 130 with the frequency-selecting
End connection.
By using the photoelectricity avalanche diode D1, with when carrying out carrying out ranging using range calibration equipment 10, institute
It states plus after reverse biased in the P-N junction of photoelectricity avalanche diode D1, the light of injection will form photoelectric current after being absorbed by P-N junction,
The sensitivity of detection can be significantly improved by amplifying photosignal using the avalanche multiplication effect of carrier.Specifically using
In, the P-N junction of photoelectricity avalanche diode D1 applies suitable high reverse biased, makes in depletion layer photo-generated carrier by strong electrical field
Acceleration obtain sufficiently high kinetic energy, and new electron hole pair is generated when ionizing with lattice collisions, these carriers
Constantly cause new ionization by collision again, causes the avalanche multiplication of carrier, obtain current gain, and the backward voltage applied is got over
Height, gain is bigger, to effectively improve mixing quality and stability, and then ensures the accuracy of the current signal obtained.
To make the sensitivity of the photoelectricity avalanche diode D1 more preferably, optionally, in the present embodiment, the power supply electricity
Road is hvdc circuit.Wherein, the output voltage of the hvdc circuit may be, but not limited to, 120V, 125V,
126V, 128V or 130V are not specifically limited herein, and are configured according to actual needs.
Wherein, the hvdc circuit may include resistance, capacitor, diode and field-effect tube etc., about described
The specific connection relationship of each electrical component is not specifically limited herein in hvdc circuit, is configured according to actual needs i.e.
It can.
To avoid the hvdc circuit when providing electric energy for the photoelectricity avalanche diode D1, made because electric current is excessive
At the impaired situation of the photoelectricity avalanche diode D1.Optionally, in the present embodiment, the photelectric receiver 110 also wraps
The 9th resistance R9 is included, the cathode of the photoelectricity avalanche diode D1 is connected by the 9th resistance R9 and the hvdc circuit
It connects.Wherein, the resistance value size of the 9th resistance R9 is not specifically limited herein, if can play metering function to avoid because
The excessive damage photoelectricity avalanche diode D1 of electric current.
The frequency-selecting amplification lattice network 130 is used to obtain the frequency signal of certain signal amplitude, so as to complete two-way
The optical frequency mixing of laser and reception are handled, therefore, to realize that making to obtain signal is suitable at subsequent conditioning circuit and AD sampling analysis
Reason, in the present embodiment, the frequency-selecting amplification lattice network 130 may include multistage selective frequency amplifier circuit, which puts
The specific series of big circuit may be, but not limited to, two-stage, three-level or level Four, be chosen according to actual needs.
Optionally, in the present embodiment, the frequency-selecting amplification lattice network 130 includes 131 He of level-one selective frequency amplifier circuit
Second level selective frequency amplifier circuit 133, the level-one selective frequency amplifier circuit 131 are connected to the photelectric receiver 110 and the second level
Between selective frequency amplifier circuit 133.The level-one selective frequency amplifier circuit 131 receives the electric current letter that the photelectric receiver 110 is sent
The first intermediate-freuqncy signal is obtained after number carrying out frequency-selecting and enhanced processing and is sent to the second level selective frequency amplifier circuit 133, described two
Grade selective frequency amplifier circuit 133 obtain after frequency-selecting and enhanced processing the second intermediate-freuqncy signal and defeated to first intermediate-freuqncy signal
Out.
Wherein, the electric elements that the level-one selective frequency amplifier circuit 131 includes may be, but not limited to, resistance, capacitor with
And operational amplifier etc., it is not specifically limited herein, as long as being able to carry out frequency-selecting and amplification to export the first intermediate-freuqncy signal.
The electric elements that the second level selective frequency amplifier circuit 133 includes, which may be, but not limited to, is not specifically limited herein resistance, capacitor
And operational amplifier etc., it is not specifically limited herein, as long as the amplification of frequency-selecting again can be carried out to the first intermediate-freuqncy signal with defeated
Second intermediate-freuqncy signal and output out.
Optionally, in the present embodiment, the level-one selective frequency amplifier circuit 131 include first resistor R1, second resistance R2,
First operational amplifier A1, first capacitor C1, the second capacitor C2 and third capacitor C3.
The first resistor R1 is connected to the output end of the photelectric receiver 110 with the first operational amplifier A1's
Between out-phase input terminal, the out-phase input terminal of the first operational amplifier A1 is connected to power supply, output end is put with the second level frequency-selecting
The input terminal connection of big circuit 133, one end of the first capacitor C1 are connected to the output end and the first electricity of photelectric receiver 110
It hinders between R1, other end ground connection, one end of the second capacitor C2 is connected to the first resistor R1 and puts with first operation
Between the out-phase input terminal of big device A1, other end ground connection, the second resistance R2 and the third capacitor C3 it is in parallel after be connected to
Between the output end and out-phase input terminal of the first operational amplifier A1.
Wherein, by the way that the first resistor R1, first capacitor C1 and the second capacitor C2 is arranged to realize to being input to
The current signal for stating the first operational amplifier A1 is filtered, and the resistance value size of the first resistor R1, first capacitor C1
The capacitance size of capacitance size and the second capacitor C2 value is not specifically limited herein, and is configured according to actual needs i.e.
It can.The negative feedback network of the first operational amplifier A1 is made up of setting second resistance R2 and third capacitor C3, wherein
The resistance value of second resistance R2 can be 1M Ω, to form profound and negative feedbck and meet conversion and the plus and blowup of signal, second
The capacitance of capacitor C2 can be 20pF, may be used as the compensating electric capacity of the level-one selective frequency amplifier circuit 131 on the one hand to eliminate
Self-oscillation phenomenon caused by profound and negative feedbck, on the other hand the bandwidth of also adjustable amplifying circuit, plays frequency-selecting amplification.
Optionally, in the present embodiment, the second level selective frequency amplifier circuit 133 include the 4th capacitor C4, the 5th capacitor C5,
6th capacitor C6, second operational amplifier A2,3rd resistor R3, the 4th resistance R4 and the 5th resistance R5, the 4th capacitor
The first end of C4 connect with the output end of the first operational amplifier A1, second end passes through the 3rd resistor R3 and described the
The first end of five capacitor C5 connects, the second end of the 5th capacitor C5 and the out-phase input terminal of the second operational amplifier A2
Connection, the non-inverting input terminal of the second operational amplifier A2 are connect with the power supply, and the 4th resistance R4 is connected to described
Between the out-phase input terminal and output end of second operational amplifier A2, the first end and second operation of the 6th capacitor C6
The out-phase input terminal of amplifier A2, second end are connect with the first end of the 5th capacitor C5, one end of the 5th resistance R5
It is connected between the 3rd resistor R3 and the 5th capacitor C5, other end ground connection.
Wherein, by the way that the 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 4th capacitor C4, the 5th capacitor is arranged
C5, the 6th capacitor C6 simultaneously cooperate second operational amplifier A2, to realize second order band-pass filtering function jointly, play frequency-selecting amplification and make
With.Therefore, spurious frequency is further suppressed and to specific frequency can play when carrying out range calibration by above-mentioned setting
It amplifies, to reach better frequency-selecting effect.
Incorporated by reference to Fig. 4, one is provided properly to the first operational amplifier A1 and second operational amplifier A2 to realize
Dc point, and realize the non-ideal characteristic of the first operational amplifier A1 and second operational amplifier A2 is mended
It repays, reduces error caused by positive negative-phase sequence curent imbalance, optionally, in the present embodiment, the laser pick-off circuit 100 also wraps
Include reference voltage circuit 150, the reference voltage circuit 150 is set to the same of the power supply and the first operational amplifier A1
Between phase input terminal and the non-inverting input terminal of second operational amplifier A2.
The reference voltage circuit 150 may include the electronic devices such as resistance and capacitor, if be capable of providing one stablize and
Glitch-free voltage.Optionally, in the present embodiment, the reference voltage circuit 150 includes the 6th resistance R6, the 7th electricity
Hinder R7, the 7th capacitor C7 and the 8th capacitor C8, one end of the 6th resistance R6 connect with the power supply, the other end respectively with
The non-inverting input terminal of the first operational amplifier A1 is connected with the non-inverting input terminal of second operational amplifier A2, the 7th electricity
One end that the one end and the 6th resistance R6 for hindering R7 are connect with the non-inverting input terminal of the first operational amplifier A1 connects, is another
One end ground connection, one end of the 7th capacitor C7 and the homophase input of the 6th resistance R6 and the first operational amplifier A1
One end connection of end connection, other end ground connection, one end and the 6th resistance R6 and first fortune of the 8th capacitor C8
Calculate one end connection, the other end ground connection of the non-inverting input terminal connection of amplifier A1.
Wherein, the 6th resistance R6 and the 7th resistance R7 constitutes bleeder circuit to the first operational amplifier A1's
Non-inverting input terminal and the non-inverting input terminal of second operational amplifier A2 provide voltage, the resistance value size of the 6th resistance R6 respectively
It is not specifically limited herein with the resistance value size of the 7th resistance R7.The 7th capacitor C7 and the 8th capacitor C8 can be to amplification
The non-ideal characteristic of device compensates, and the capacitance size of the 7th capacitor C7 and the capacitance size of the 8th capacitor C8 exist
This is not especially limited, and is configured according to actual needs.
Detect whether the photelectric receiver 110 overloads to realize, in the present embodiment, the range calibration equipment 10 is also
Including processor 400, the laser pick-off circuit 100 further includes overload observation circuit 170, and the overload observation circuit 170 wraps
Include the 8th resistance R8 and the 9th capacitor C9.The output end of one end of the 8th resistance R8 and the first operational amplifier A1 connect
It connects, the other end is connected to ground by the 9th capacitor C9, one end that the 8th resistance R8 is connect with the 9th capacitor C9
It is also connect with the processor 400, so that the processor 400 can obtain the 8th resistance R8 and the 9th capacitor C9
Between voltage signal to judge whether the photelectric receiver 110 overloads.
To sum up, laser pick-off circuit 100 provided by the utility model and range calibration equipment 10, laser pick-off circuit 100
Amplify lattice network 130 including photelectric receiver 110 and frequency-selecting, photelectric receiver 110 is electrically connected with frequency-selecting amplification lattice network 130
It connects, photelectric receiver 110 receives the first modulation laser that main transmitter 200 emits simultaneously and reference transmitter 300 emits the
Two modulation laser are to carry out Frequency mixing processing, and the modulation laser that Frequency mixing processing is obtained carries out photoelectric conversion and generates a current signal
And it is sent to frequency-selecting amplification lattice network 130, after frequency-selecting amplifies lattice network 130 to current signal progress frequency-selecting and enhanced processing
It obtains an intermediate-freuqncy signal and exports, and then the problem of circuit complexity is effectively relieved, and mixing quality and stability can be effectively improved.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, term " includes " or any other variant are intended to nonexcludability
Include so that include a series of elements process, method, article or equipment not only include those elements, but also
Including other elements that are not explicitly listed, or further include for this process, method, article or equipment intrinsic want
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including described want
There is also other identical elements in the process, method, article or equipment of element.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation
Or replacement, it should be covered within the scope of the utility model.Therefore, the protection scope of the utility model is answered described with power
Subject to the protection scope that benefit requires.
Claims (10)
1. a kind of laser pick-off circuit, applied to the range calibration equipment including main transmitter and reference transmitter, feature exists
In the laser pick-off circuit includes that lattice network, the photelectric receiver and the frequency-selecting are amplified in photelectric receiver and frequency-selecting
Amplify lattice network electrical connection；
The photelectric receiver receives the first modulation laser and the reference transmitter transmitting of the main transmitter transmitting simultaneously
The second modulation laser to carry out Frequency mixing processing, and the modulation laser that Frequency mixing processing is obtained carries out photoelectric conversion and generates an electric current
Signal is simultaneously sent to frequency-selecting amplification lattice network, the frequency-selecting amplification lattice network to the current signal carry out frequency-selecting and
An intermediate-freuqncy signal is obtained after enhanced processing and is exported.
2. laser pick-off circuit according to claim 1, which is characterized in that the frequency-selecting amplification lattice network includes level-one
Selective frequency amplifier circuit and second level selective frequency amplifier circuit, the level-one selective frequency amplifier circuit be connected to the photelectric receiver with it is described
Between second level selective frequency amplifier circuit；
After the level-one selective frequency amplifier circuit receives the current signal progress frequency-selecting and enhanced processing that the photelectric receiver is sent
It obtains the first intermediate-freuqncy signal and is sent to the second level selective frequency amplifier circuit, the second level selective frequency amplifier circuit is in described first
Frequency signal obtains the second intermediate-freuqncy signal after carrying out frequency-selecting and enhanced processing and exports.
3. laser pick-off circuit according to claim 2, which is characterized in that the level-one selective frequency amplifier circuit includes first
Resistance, second resistance, the first operational amplifier, first capacitor, the second capacitor and third capacitor, the first resistor are connected to
Between the output end of the photelectric receiver and the out-phase input terminal of first operational amplifier, the first operational amplifier it is different
Phase input terminal connects to power supply, output end is connect with the input terminal of the second level selective frequency amplifier circuit, and the one of the first capacitor
End is connected between the output end of photelectric receiver and first resistor, the other end is grounded, and one end of second capacitor is connected to
Between the first resistor and the out-phase input terminal of first operational amplifier, other end ground connection, the second resistance and institute
It is connected between the output end and out-phase input terminal of first operational amplifier after stating third capacitor parallel connection.
4. laser pick-off circuit according to claim 3, which is characterized in that the second level selective frequency amplifier circuit includes the 4th
Capacitor, the 5th capacitor, the 6th capacitor, second operational amplifier, 3rd resistor, the 4th resistance and the 5th resistance, the described 4th
The first end of capacitor is connect with the output end of first operational amplifier, second end passes through the 3rd resistor and the described 5th
The first end of capacitor connects, and the second end of the 5th capacitor is connect with the out-phase input terminal of the second operational amplifier, institute
The non-inverting input terminal for stating second operational amplifier is connect with the power supply, and the 4th resistance is connected to second operation amplifier
Between the out-phase input terminal and output end of device, the first end of the 6th capacitor and the out-phase of the second operational amplifier are inputted
End, second end are connect with the first end of the 5th capacitor, and one end of the 5th resistance is connected to the 3rd resistor and institute
It states between the 5th capacitor, other end ground connection.
5. laser pick-off circuit according to claim 4, which is characterized in that the laser pick-off circuit further includes with reference to electricity
Volt circuit, the reference voltage circuit are set to the non-inverting input terminal and the second fortune of the power supply and first operational amplifier
Between the non-inverting input terminal for calculating amplifier.
6. laser pick-off circuit according to claim 5, which is characterized in that the reference voltage circuit includes the 6th electricity
Resistance, the 7th resistance, the 7th capacitor and the 8th capacitor, one end of the 6th resistance is connect with the power supply, the other end is distinguished
It is connect with the non-inverting input terminal of the non-inverting input terminal of first operational amplifier and second operational amplifier, the 7th resistance
One end connect with the non-inverting input terminal of the 6th resistance and first operational amplifier one end connection, another termination
Ground, one end that one end of the 7th capacitor is connect with the non-inverting input terminal of the 6th resistance and first operational amplifier
Connection, other end ground connection, one end of the 8th capacitor and the 6th resistance are same mutually defeated with first operational amplifier
Enter one end connection, the other end ground connection of end connection.
7. laser pick-off circuit according to claim 4, which is characterized in that the range calibration equipment further includes processing
Device, the laser pick-off circuit further include overload observation circuit, and the overload observation circuit includes the 8th resistance and the 9th capacitor,
One end of 8th resistance is connect with the output end of first operational amplifier, the other end passes through the 9th capacitor and ground
Connection, the 8th resistance and one end of the 9th capacitance connection are also connected to the processor.
8. laser pick-off circuit according to claim 1, which is characterized in that the photelectric receiver includes photoelectricity snowslide two
Pole pipe, the cathode of the photoelectricity avalanche diode is connect with power circuit, anode amplifies the input of lattice network with the frequency-selecting
End connection.
9. laser pick-off circuit according to claim 8, which is characterized in that the photelectric receiver further includes the 9th electricity
The cathode of resistance, the photoelectricity avalanche diode is connect by the 9th resistance with the power circuit, and the power circuit is
Hvdc circuit.
10. a kind of range calibration equipment characterized by comprising main transmitter, reference transmitter, processor and right are wanted
Laser pick-off circuit described in 1-9 any one is sought, the laser pick-off circuit includes photelectric receiver and frequency-selecting amplification network
Circuit, the photelectric receiver are electrically connected with frequency-selecting amplification lattice network, the frequency-selecting amplification lattice network and the place
Manage device electrical connection；
The main transmitter is used for the first modulation laser of object to be measured transmitting and reflexes to the light by the object to be measured
Electric receiver；
The reference transmitter is used for the second modulation of transmitting laser while the main transmitter emits the first high frequency modulated light
To the photelectric receiver；
The photelectric receiver is used for while receiving the first modulation laser and the second modulation laser carries out photoelectric conversion
It generates a current signal and is sent to the frequency-selecting amplification lattice network, the frequency-selecting amplification lattice network is to the current signal
An intermediate-freuqncy signal is obtained after carrying out frequency-selecting and enhanced processing and is exported to the processor；
The processor is used to carry out phase analysis according to the intermediate-freuqncy signal to obtain a distance value.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810627766 | 2018-06-19 | ||
| CN201820940420 | 2018-06-19 | ||
| CN2018106277660 | 2018-06-19 | ||
| CN2018209404201 | 2018-06-19 |
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| Publication Number | Publication Date |
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| CN208752200U true CN208752200U (en) | 2019-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821343527.4U Active CN208752200U (en) | 2018-06-19 | 2018-08-20 | Laser pick-off circuit and range calibration equipment |
| CN201810949867.XA Pending CN109061666A (en) | 2018-06-19 | 2018-08-20 | Distance measuring equipment and method |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810949867.XA Pending CN109061666A (en) | 2018-06-19 | 2018-08-20 | Distance measuring equipment and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709571B (en) * | 2019-02-01 | 2021-06-15 | 武汉市聚芯微电子有限责任公司 | TOF ranging method and device |
| CN110716193B (en) * | 2019-12-12 | 2020-05-08 | 深圳市迈测科技股份有限公司 | Signal generation method and device |
| US11747474B2 (en) | 2019-11-18 | 2023-09-05 | Shenzhen Mileseey Technology Co., Ltd. | Systems and methods for laser distance measurement |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7586586B2 (en) * | 2007-01-19 | 2009-09-08 | Associates Universities, Inc. | Fiber optically coupled, multiplexed, and chopped laser rangefinder |
| CN101581783B (en) * | 2008-05-16 | 2013-04-17 | 深圳市迈测科技有限公司 | Calibration method for phase measurement, device and distance measuring apparatus |
| CN104515997B (en) * | 2013-09-26 | 2017-08-25 | 江苏徕兹测控科技有限公司 | Calibration method and its range unit based on single liquid crystal light valve phase measurement |
| CN106257237B (en) * | 2015-06-18 | 2023-09-01 | 上海诺司纬光电仪器有限公司 | Phase type laser range finder of single phase-locked loop |
| CN106461764B (en) * | 2015-12-10 | 2018-08-21 | 何刚 | Calibration method and its device based on Single wavelength bidifly light pipe phase measurement |
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2018
- 2018-08-20 CN CN201821343527.4U patent/CN208752200U/en active Active
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