CN106019292B - Phase laser distance measurement instrument laser pick-off circuit - Google Patents
Phase laser distance measurement instrument laser pick-off circuit Download PDFInfo
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- CN106019292B CN106019292B CN201610313475.5A CN201610313475A CN106019292B CN 106019292 B CN106019292 B CN 106019292B CN 201610313475 A CN201610313475 A CN 201610313475A CN 106019292 B CN106019292 B CN 106019292B
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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
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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
- 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
Abstract
The present invention provides a kind of phase laser distance measurement instrument laser pick-off circuit, including trans-impedance amplifier and high-frequency amplifier module, frequency mixer and the intermediate frequency amplification module and bandpass filter module being sequentially connected；Trans-impedance amplifier and high-frequency amplifier module include the special APD pipes for making photoelectric sensor, trans-impedance amplifier and high-frequency amplifier that the electric signal that laser signal is converted into is amplified are received to APD pipes；Frequency mixer and intermediate frequency amplification module include the double balanced mixer and IF amplifier circuit for being mixed measuring signal and local oscillation signal；Bandpass filter module final output centre frequency is the distance measuring signal of the sine voltage form of 14.0625KHz.The present invention can effectively overcome in the prior art that not only as sensor but also caused drawback is used as frequency mixer, overall noise is greatly reduced APD pipes than the prior art；Circuit performance is more stable, measurement accuracy higher, and can effectively lift the ranging of phase laser distance measurement instrument.
Description
Technical field
The present invention relates to phase laser distance measurement instrument, and in particular to a kind of laser pick-off electricity of phase laser distance measurement instrument
Road.
Background technology
The operation principle of phase laser distance measurement instrument is the frequency with radio wave band, and laser beam is modulated simultaneously into line amplitude
Measure modulates the round-trip survey line of light once caused phase delay, further according to the wavelength of modulation light, converts this phase delay institute's generation
The distance of table.Laser emission drive circuit and laser pick-off circuit are the important components of laser range finder, its performance it is good
The performance indicators such as the bad measurement distance for directly influencing laser range finder, ranging accuracy, working sensitivity, job stability.
At present, the laser pick-off circuit used in common phase laser distance measurement instrument, it is usually managed using APD（Snowslide two
Pole pipe）At the same time whole laser pick-off is so that as the sensor and the frequency mixer of reception signal for receiving laser signal, its advantage
Circuit structure is fairly simple, but its there are the problem of be：Since APD pipes are typically to be dedicated as the device that photoelectric sensor uses
Part, is not appropriate for using as frequency mixer；Laser pick-off circuit used in existing phase laser distance measurement instrument, it manages APD
Both used as optical signal sensor with frequency mixer is also served as, for the phase laser distance measurement instrument of different modulation frequencies, mixing
Gain difference is obvious；Mixing voltages difference is very big, such as the high-frequency phase formula laser range finder that frequency is 115MHz, mixing electricity
As long as press 3V or so；And but need the electricity of 30V for the low frequency phase formula laser range finder that frequency is 450KHz, mixing voltages
Pressure, when mixing voltages are higher, the interference to circuit is relatively large, improves the overall noise level of system, reduces electricity
The job stability on road；For the ranging of more than 200 meters distances, measurement accuracy is influenced.
The content of the invention
The purpose of the present invention is：There is provided a kind of new phase laser distance measurement instrument laser pick-off circuit, APD in the circuit
The special photoelectric signal sensor for making to receive laser signal is managed, by setting special frequency mixer and intermediate frequency amplification module to be mixed
Frequency operates, and effectively overcomes the pipe of APD in the prior art not only as the sensor for receiving laser signal but also as the mixing of reception signal
Device uses caused drawback.
The technical scheme is that：The phase laser distance measurement instrument laser pick-off circuit of the present invention, its design feature
It is：Including trans-impedance amplifier and high-frequency amplifier module, frequency mixer and intermediate frequency amplification module and bandpass filter module；
Above-mentioned trans-impedance amplifier and high-frequency amplifier module are equipped with the first power end, second source end, HVB high voltage bias letter
Number input terminal, the first signal output part and secondary signal output terminal；Frequency mixer and intermediate frequency amplification module are equipped with power end, the first letter
Number input terminal, secondary signal input terminal, local oscillation signal input terminal, the first signal output part and secondary signal output terminal；Band logical is filtered
Ripple device module is equipped with power end, the first signal input part, secondary signal input terminal and measuring signal output terminal.
Trans-impedance amplifier and the first power end of high-frequency amplifier module, frequency mixer and intermediate frequency amplification module power end with
And bandpass filter module power end use when external phase laser distance measurement instrument DC+5V power vds D；Trans-impedance amplifier
And high-frequency amplifier module second source end use when external phase laser distance measurement instrument DC-5V power supplys VCC；Amplify across resistance
The DC+160V voltages of external phase laser distance measurement instrument when device and the HVB high voltage bias signal input part of high-frequency amplifier module use
Signal HV；The local oscillation signal input terminal of the frequency mixer and intermediate frequency amplification module sheet that external phase laser distance measurement instrument provides when using
Shake signal Fosc input；The first signal input part and secondary signal input terminal of frequency mixer and intermediate frequency amplification module across resistance with putting
Big device and the corresponding electrical connection respectively of the first signal output part and secondary signal output terminal of high-frequency amplifier module；Bandpass filter
First signal output part of the first signal input part and secondary signal input terminal of module and frequency mixer and intermediate frequency amplification module and
Secondary signal output terminal is corresponding respectively to be electrically connected；The measuring signal output terminal output center frequency of bandpass filter module is
The distance measuring signal Uout of the sine voltage form of 14.0625KHz.
Further scheme is：Above-mentioned trans-impedance amplifier and high-frequency amplifier module include resistance R1 to R6 totally 6 electricity
Resistance, capacitance C1 to C15 totally 15 capacitances, APD pipes D1, integrated chip U1 and integrated chip U2；Integrated chip U1 is MAX3658 types
Number trans-impedance amplifier, it has 1 to No. 8 pin；Integrated chip U2 be UA733M models high-frequency amplifier, its have 1 to
No. 10 pins；
One end of resistance R1 is above-mentioned trans-impedance amplifier and the HVB high voltage bias signal input part of high-frequency amplifier module；
One end of the other end of resistance R1, one end of resistance R2 and capacitance C1 is conllinear；The other end of resistance R2, one end of capacitance C2 with
And the anode of APD pipes D1 is conllinear；The cathode of APD pipes D1 is electrically connected with No. 2 pins of integrated chip U1；No. 3 of integrated chip U1
Pin is electrically connected with one end of capacitance C6；No. 1 pin, one end of resistance R3, one end of capacitance C4 and the electricity of integrated chip U1
The one end for holding C5 is conllinear；No. 4 pins of integrated chip U1 are vacant；No. 5 pins and No. 8 pins of integrated chip U1, capacitance C1
The other end, the other end of capacitance C2, the other end of capacitance C4, the other end of the other end of capacitance C5 and capacitance C6 are grounded；
No. 7 pins of integrated chip U1 are electrically connected with one end of capacitance C7；The other end of capacitance C7, one end of resistance R4 and integrated core
No. 1 pin of piece U2 is conllinear；No. 6 pins of integrated chip U1 are electrically connected with one end of capacitance C8；The other end, the resistance of capacitance C8
One end of R5 and No. 10 pins of integrated chip U2 are conllinear；No. 7 pins, one end of resistance R6, the capacitance C10 of integrated chip U2
One end and capacitance C11 one end it is conllinear；No. 4 pins of integrated chip U2, one end of resistance R7, capacitance C12 one end with
And one end of capacitance C13 is conllinear；One end of the other end of resistance R7, one end of capacitance C14 and capacitance C15 is formed because conllinear
One common junction, the common junction are the second source end of above-mentioned trans-impedance amplifier and high-frequency amplifier module；It is integrated
No. 5 pins of chip U2 are above-mentioned trans-impedance amplifier and the first signal output part of high-frequency amplifier module；Integrated chip
No. 6 pins of U2 are above-mentioned trans-impedance amplifier and the secondary signal output terminal of high-frequency amplifier module；Resistance R3's is another
End, one end of capacitance C3, the other end of one end of capacitance C9 and resistance R6 form a common junction because conllinear, this is public
Contact is above-mentioned trans-impedance amplifier and the first power end of high-frequency amplifier module；No. 2, No. 3, No. 8 of integrated chip U2
It is vacant with No. 9 pins；The other end of resistance R4, the other end of resistance R5, the other end of capacitance C3 and capacitance C9 to C15 totally 7
The other end of capacitance is grounded.
Further scheme is：Above-mentioned frequency mixer and intermediate frequency amplification module include resistance R8 to R14 totally 7 resistance, electricity
Hold C16 to C26 totally 11 capacitances, electrolytic capacitor C27, electrolytic capacitor C28, integrated chip U3 and integrated chip U4；Integrated chip
U3 is the double balanced mixer of SA602AD models, it has 1 to No. 7 pin；Integrated chip U4 is that the computing of AD8616 models is put
Big device, it has 1 to No. 4 pin；
One end of capacitance C16 is the first signal input part of above-mentioned frequency mixer and intermediate frequency amplification module；Capacitance C17's
One end is the secondary signal input terminal of above-mentioned frequency mixer and intermediate frequency amplification module；The other end of capacitance C16 and capacitance C17 with
No. 1 of integrated chip U3 and the corresponding electrical connection respectively of No. 2 pins；No. 5 pins of integrated chip U3, one end of capacitance C18 and
One end of resistance R8 is conllinear；No. 6 pins of integrated chip U3 are electrically connected with one end of capacitance C19；The other end, the electricity of capacitance C19
One end of resistance R9 and one end of resistance R10 are conllinear；The other end of resistance R9 is above-mentioned frequency mixer and intermediate frequency amplification module
Local oscillation signal input terminal；No. 3 pins, the other end of capacitance C18 and the other end of resistance R10 of integrated chip U3 connects
Ground；One end of No. 4 pins of integrated chip U3, one end of capacitance C20 and capacitance C21 is conllinear；No. 5 of integrated chip U3 are drawn
One end of foot, the other end of capacitance C20 and capacitance C22 is conllinear；No. 7 pins of integrated chip U3 are vacant；Capacitance C21's is another
End is electrically connected with one end of resistance R11；The other end of resistance R11, one end of resistance R12, one end of capacitance C24 and integrated core
No. 2 pins of piece U4 are conllinear；No. 1 pin of the other end of resistance R12, the other end of capacitance C24 and integrated chip U4 is because altogether
Line and form a common junction, which is the first signal output of above-mentioned frequency mixer and intermediate frequency amplification module
End；The other end of capacitance C22 is electrically connected with one end of resistance R13；The other end of resistance R13, one end of resistance R14, capacitance C26
One end and integrated chip U4 No. 3 pins it is conllinear；The other end of resistance R14, the other end of capacitance C26, the one of capacitance C25
The cathode of end and electrolytic capacitor C27 form a common junction because conllinear, the common junction be above-mentioned frequency mixer and
The secondary signal output terminal of intermediate frequency amplification module；The other end of resistance R8, one end of capacitance C23 and electrolytic capacitor C28 are just
Pole forms a common junction because conllinear, which is the power end of above-mentioned frequency mixer and intermediate frequency amplification module；
The other end of capacitance C23, the anode of electrolytic capacitor C28, the other end of capacitance C25, the anode of electrolytic capacitor C27 and integrated core
No. 4 pins of piece U4 are grounded.
Further scheme is：Above-mentioned bandpass filter module includes resistance R15 to R21 totally 7 resistance, capacitance C29
To C32 totally 4 capacitances, electrolytic capacitor C33, electrolytic capacitor C34, inductance L1 and integrated chip U5；Integrated chip U5 is AD8616
The operational amplifier of model, it has 1 to No. 8 pin；
One end of resistance R15 is the first signal input part of above-mentioned bandpass filter module；Resistance R15's is another
End, one end of resistance R16, one end of one end of capacitance C29 and capacitance C30 are conllinear；The other end of capacitance C29, resistance R18
No. 6 pins of one end and integrated chip U5 are conllinear；The other end of capacitance C30, the other end of resistance R18 and integrated chip U5
No. 7, No. 3 pins it is conllinear；The other end of resistance R16 is electrically connected with one end of resistance R17；The other end, the resistance of resistance R17
No. 5 pins of one end of R19, one end of resistance R20 and integrated chip U5 form a common junction because conllinear, this is public
Contact is the secondary signal input terminal of above-mentioned bandpass filter module；No. 8 pins of integrated chip U5, resistance R19 it is another
One end, one end of capacitance C31, the cathode of electrolytic capacitor C33, one end of the cathode of electrolytic capacitor C34 and inductance L1 are conllinear；Electricity
The other end of sense L1 is the power end of above-mentioned bandpass filter module；No. 1 of integrated chip U5, No. 2 pins and resistance
One end of R21 is conllinear；The other end of resistance R21 and one end of capacitance C32 form a common junction because conllinear, this is public to connect
Point is the measuring signal output terminal of above-mentioned bandpass filter module；No. 4 pins of integrated chip U5, electrolytic capacitor C33
Anode, the anode of electrolytic capacitor C34, the other end of capacitance C31, the other end of the other end of capacitance C32 and resistance R20 connect
Ground.
The present invention has positive effect：（1）The phase laser distance measurement instrument laser pick-off circuit of the present invention, its APD
Manage it is special make photoelectric signal sensor, by setting special frequency mixer and intermediate frequency amplification module, utilize the double of SA602AD models
APD pipes measurement electric signal and the local oscillation signal that laser range finder provides are carried out mixing operation by balanced mixer, so that not
Conversion gain with the phase laser distance measurement instrument of modulation frequency is almost equal, and mixing local oscillator voltage is smaller（About 200mVpp is left
It is right）；Influence of the mixing voltages to whole circuit can almost be ignored；Manage while make so as to effectively overcome APD in the prior art
Such as the phase type of different modulation frequencies is swashed caused by the frequency mixer of signal to receive the sensor of laser signal and receiving
Optar conversion gain difference is obvious, mixing voltages difference is very big, when mixing voltages are higher to whole circuit
Disturb relatively large, the horizontal height of overall noise, the reduction of circuit job stability；Especially for the ranging of more than 200 meters distances
For, influence a variety of drawbacks such as measurement accuracy.（2）The phase laser distance measurement instrument laser pick-off circuit of the present invention, its entirety
Noise is greatly reduced than the prior art；Circuit performance is more stable；Measurement accuracy higher, can be substantially improved phase type laser
The ranging of rangefinder, under normal environment conditions, the actual measurement distance of no cooperative target is up to 700 meters or so；Single prism
（Cooperative target）Measurement distance be more than 3000 meters, three prisms（Cooperative target）Measurement distance be 6000 meters or so.
Brief description of the drawings
Fig. 1 is the circuit structure schematic block diagram of the present invention；
Fig. 2 is a kind of electrical schematic diagram of the trans-impedance amplifier and high-frequency amplifier module in Fig. 1；
Fig. 3 is a kind of electrical schematic diagram of the frequency mixer and intermediate frequency amplification module in Fig. 1；
Fig. 4 is a kind of electrical schematic diagram of the bandpass filter module in Fig. 1.
Embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
（Embodiment 1）
See Fig. 1, the phase laser distance measurement instrument laser pick-off circuit of the present embodiment, it is mainly by trans-impedance amplifier and height
Audio amplifier module, frequency mixer and intermediate frequency amplification module and bandpass filter module composition.
Trans-impedance amplifier and high-frequency amplifier module are equipped with the first power end, second source end, the input of HVB high voltage bias signal
End, the first signal output part and secondary signal output terminal；Frequency mixer and intermediate frequency amplification module are equipped with power end, the first signal inputs
End, secondary signal input terminal, local oscillation signal input terminal, the first signal output part and secondary signal output terminal；Bandpass filter mould
Block is equipped with power end, the first signal input part, secondary signal input terminal and measuring signal output terminal.
The DC+ of external phase laser distance measurement instrument when trans-impedance amplifier and the first power end of high-frequency amplifier module use
5V power vds D；External phase laser distance measurement instrument when the second source end of trans-impedance amplifier and high-frequency amplifier module uses
DC-5V power supplys VCC；External phase type swashs during the HVB high voltage bias signal input part use of trans-impedance amplifier and high-frequency amplifier module
The DC+160V voltage signals HV of optar；External phase type laser when the power end of frequency mixer and intermediate frequency amplification module uses
The DC+5V power vds D of rangefinder；External phase type laser when the local oscillation signal input terminal of frequency mixer and intermediate frequency amplification module uses
The local oscillation signal Fosc input that rangefinder provides；The first signal input part and secondary signal of frequency mixer and intermediate frequency amplification module
Input terminal and the first signal output part and secondary signal output terminal of trans-impedance amplifier and high-frequency amplifier module are corresponding electric respectively
Connection；The DC+5V power vds D of external phase laser distance measurement instrument when the power end of bandpass filter module uses；Bandpass filtering
The first signal input part and secondary signal input terminal of device module and frequency mixer and the first signal output part of intermediate frequency amplification module
With the corresponding electrical connection respectively of secondary signal output terminal；Swash during the measuring signal output terminal use of bandpass filter module to phase type
Optar provides the distance measuring signal Uout for the sine voltage form that centre frequency is 14.0625KHz, by phase type Laser Measuring
The signal processing unit of distance meter rear end carries out calculating processing and calculates measurement distance.
See Fig. 2, trans-impedance amplifier and high-frequency amplifier module are mainly by resistance R1 to R6 totally 6 resistance, capacitance C1 to C15
Totally 15 capacitances, APD pipes D1, integrated chip U1 and integrated chip U2 compositions.Preferably used in integrated chip U1 the present embodiment
The trans-impedance amplifier of MAX3658 models（Also referred to as mutual resistance preamplifier）, it has 1 to No. 8 pin；This reality of integrated chip U2
The high-frequency amplifier that UA733M models are preferably used in example is applied, it has 1 to No. 10 pin.
One end of resistance R1 is foregoing trans-impedance amplifier and the HVB high voltage bias signal input part of high-frequency amplifier module；
One end of the other end of resistance R1, one end of resistance R2 and capacitance C1 is conllinear；The other end of resistance R2, one end of capacitance C2 with
And the anode of APD pipes D1 is conllinear；The cathode of APD pipes D1 is electrically connected with No. 2 pins of integrated chip U1；No. 3 of integrated chip U1
Pin is electrically connected with one end of capacitance C6；No. 1 pin, one end of resistance R3, one end of capacitance C4 and the electricity of integrated chip U1
The one end for holding C5 is conllinear；No. 4 pins of integrated chip U1 are vacant；No. 5 pins and No. 8 pins of integrated chip U1, capacitance C1
The other end, the other end of capacitance C2, the other end of capacitance C4, the other end of the other end of capacitance C5 and capacitance C6 are grounded；
No. 7 pins of integrated chip U1 are electrically connected with one end of capacitance C7；The other end of capacitance C7, one end of resistance R4 and integrated core
No. 1 pin of piece U2 is conllinear；No. 6 pins of integrated chip U1 are electrically connected with one end of capacitance C8；The other end, the resistance of capacitance C8
One end of R5 and No. 10 pins of integrated chip U2 are conllinear；No. 7 pins, one end of resistance R6, the capacitance C10 of integrated chip U2
One end and capacitance C11 one end it is conllinear；No. 4 pins of integrated chip U2, one end of resistance R7, capacitance C12 one end with
And one end of capacitance C13 is conllinear；One end of the other end of resistance R7, one end of capacitance C14 and capacitance C15 is formed because conllinear
One common junction, the common junction are the second source end of foregoing trans-impedance amplifier and high-frequency amplifier module（VCC=-
5V）；No. 5 pins of integrated chip U2 are foregoing trans-impedance amplifier and the first signal output part of high-frequency amplifier module；
No. 6 pins of integrated chip U2 are foregoing trans-impedance amplifier and the secondary signal output terminal of high-frequency amplifier module；Resistance
The other end of R3, one end of capacitance C3, the other end of one end of capacitance C9 and resistance R6 form one because conllinear and public connect
Point, the common junction are foregoing trans-impedance amplifier and the first power end of high-frequency amplifier module（VDD=+5V）；Integrated core
No. 2, No. 3, No. 8 and No. 9 pins of piece U2 are vacant；The other end of resistance R4, the other end of resistance R5, capacitance C3 the other end with
And the other end of capacitance C9 to C15 totally 7 capacitances is grounded.
See Fig. 3, frequency mixer and intermediate frequency amplification module are mainly by resistance R8 to R14 totally 7 resistance, capacitance C16 to C26 totally 11
Capacitance, electrolytic capacitor C27, electrolytic capacitor C28, integrated chip U3 and integrated chip U4 compositions.Integrated chip U3 the present embodiment
In preferably use SA602AD models double balanced mixer, it has 1 to No. 8 pin（Do not drawn entirely in attached drawing 3, pin is not complete
With）；The operational amplifier of AD8616 models is preferably used in integrated chip U4 the present embodiment, it has 1 to No. 4 pin
（AD8616 has 8 pins, is not drawn entirely in attached drawing 3, pin is not used entirely）.
One end of capacitance C16 is the first signal input part of foregoing frequency mixer and intermediate frequency amplification module；Capacitance C17's
One end is the secondary signal input terminal of foregoing frequency mixer and intermediate frequency amplification module；The other end of capacitance C16 and capacitance C17 with
No. 1 of integrated chip U3 and the corresponding electrical connection respectively of No. 2 pins；No. 5 pins of integrated chip U3, one end of capacitance C18 and
One end of resistance R8 is conllinear；No. 6 pins of integrated chip U3 are electrically connected with one end of capacitance C19；The other end, the electricity of capacitance C19
One end of resistance R9 and one end of resistance R10 are conllinear；The other end of resistance R9 is foregoing frequency mixer and intermediate frequency amplification module
Local oscillation signal input terminal（Meet local oscillation signal Fosc input）；No. 3 pins of integrated chip U3, the other end of capacitance C18 with
And the other end of resistance R10 is grounded；No. 4 pins, one end of capacitance C20 and one end of capacitance C21 of integrated chip U3 is total to
Line；One end of No. 5 pins of integrated chip U3, the other end of capacitance C20 and capacitance C22 is conllinear；No. 7 of integrated chip U3 are drawn
Foot is vacant；The other end of capacitance C21 is electrically connected with one end of resistance R11；The other end of resistance R11, one end of resistance R12, electricity
One end of appearance C24 and No. 2 pins of integrated chip U4 are conllinear；The other end of resistance R12, the other end and collection of capacitance C24
No. 1 pin into chip U4 forms a common junction because conllinear, which is that foregoing frequency mixer and intermediate frequency are put
First signal output part of big module；The other end of capacitance C22 is electrically connected with one end of resistance R13；The other end of resistance R13,
No. 3 pins of one end of resistance R14, one end of capacitance C26 and integrated chip U4 are conllinear；The other end, the capacitance of resistance R14
The cathode of the other end of C26, one end of capacitance C25 and electrolytic capacitor C27 forms a common junction because conllinear, this is public
Contact is the secondary signal output terminal of foregoing frequency mixer and intermediate frequency amplification module；The other end of resistance R8, the one of capacitance C23
The cathode of end and electrolytic capacitor C28 form a common junction because conllinear, the common junction be foregoing frequency mixer and
The power end of intermediate frequency amplification module（VDD=+5V）；The other end of capacitance C23, the anode of electrolytic capacitor C28, capacitance C25 it is another
No. 4 pins at end, the anode of electrolytic capacitor C27 and integrated chip U4 are grounded.
See Fig. 4, bandpass filter module is mainly by resistance R15 to R21 totally 7 resistance, capacitance C29 to C32 totally 4 electricity
Appearance, electrolytic capacitor C33, electrolytic capacitor C34, inductance L1 and integrated chip U5 compositions.Preferably adopted in integrated chip U5 the present embodiment
With the operational amplifier of AD8616 models, it has 1 to No. 8 pin.
One end of resistance R15 is the first signal input part of foregoing bandpass filter module；Resistance R15's is another
End, one end of resistance R16, one end of one end of capacitance C29 and capacitance C30 are conllinear；The other end of capacitance C29, resistance R18
No. 6 pins of one end and integrated chip U5 are conllinear；The other end of capacitance C30, the other end of resistance R18 and integrated chip U5
No. 7, No. 3 pins it is conllinear；The other end of resistance R16 is electrically connected with one end of resistance R17；The other end, the resistance of resistance R17
No. 5 pins of one end of R19, one end of resistance R20 and integrated chip U5 form a common junction because conllinear, this is public
Contact is the secondary signal input terminal of foregoing bandpass filter module；No. 8 pins of integrated chip U5, resistance R19 it is another
One end, one end of capacitance C31, the cathode of electrolytic capacitor C33, one end of the cathode of electrolytic capacitor C34 and inductance L1 are conllinear；Electricity
The other end of sense L1 is the power end of foregoing bandpass filter module（VDD）；No. 1 of integrated chip U5, No. 2 pins and
One end of resistance R21 is conllinear；The other end of resistance R21 forms a common junction with one end of capacitance C32 because conllinear, the public affairs
Contact is the measuring signal output terminal of foregoing bandpass filter module altogether（Uout）；No. 4 pins of integrated chip U5, electrolysis
The anode of capacitance C33, the anode of electrolytic capacitor C34, the other end of capacitance C31, the other end of capacitance C32 and resistance R20
The other end is grounded.
The phase laser distance measurement instrument laser pick-off circuit of the present embodiment, its operation principle are summarized as follows：
In trans-impedance amplifier and high-frequency amplifier module, APD pipes D1 is exclusively used in receiving range laser as photoelectric sensor
Laser signal is simultaneously converted into electric signal, trans-impedance amplifier of the electric signal through MAX3658 models of APD pipes D1 by signal（Integrated core
Piece U1）Tentatively amplified, then the high-frequency amplifier by UA733M models（Integrated chip U2）Amplified again, then it is amplified
Electric signal is sent to frequency mixer and intermediate frequency amplification module；The double flat weighing apparatus of SA602AD models in frequency mixer and intermediate frequency amplification module
Frequency mixer（Integrated chip U3）By high-frequency amplifier（Integrated chip U2）The local oscillator that the electric signal of transmission is provided with laser range finder
Signal Fosc input are mixed, operational amplifier of the signal after mixing through AD8616 models（Integrated chip U4）Based on
IF amplifier circuit carries out signal amplification, is then forwarded to bandpass filter module, the gain selected as 1 of bandpass filter module,
Band logical output capacitance C32 is used to further filter out the useless high-frequency noise beyond centre frequency；Bandpass filter module is finally defeated
Go out the distance measuring signal Uout for the sine voltage form that centre frequency is 14.0625KHz, by phase laser distance measurement instrument rear end
Signal processing unit carries out calculating processing and calculates measurement distance.
To sum up, the phase laser distance measurement instrument laser pick-off circuit of the present embodiment, its APD pipe D1 is special to make photosignal
Sensor, by setting special frequency mixer and intermediate frequency amplification module, using the double balanced mixer of SA602AD models by APD
Pipe measures electric signal and carries out mixing operation with the local oscillation signal that laser range finder provides, so that the phase of different modulation frequencies
The conversion gain of formula laser range finder is almost equal, and mixing local oscillator voltage is smaller（About 200mVpp or so）；Mixing voltages are to whole
The influence of circuit can almost be ignored；Managed while as the biography for receiving laser signal so as to effectively overcome APD in the prior art
It is such as poor to the phase laser distance measurement instrument conversion gain of different modulation frequencies caused by the frequency mixer of sensor and reception signal
Not obvious, mixing voltages difference is very big, the interference when mixing voltages are higher to whole circuit is relatively large, integrally makes an uproar
Sound is horizontal high, and circuit job stability reduces；For the ranging of more than 200 meters distances, measurement accuracy etc. is influenced
A variety of drawbacks；Moreover, the phase laser distance measurement instrument laser pick-off circuit of the present embodiment, its overall noise is than the prior art
It is greatly reduced；Circuit performance is more stable；Measurement accuracy higher；The ranging of phase laser distance measurement instrument can be substantially improved,
Under normal environment conditions, the actual measurement distance of no cooperative target is up to 700 meters or so；Single prism（Cooperative target）Measurement
Distance is more than 3000 meters, three prisms（Cooperative target）Measurement distance be 6000 meters or so.
Above example is the explanation to the embodiment of the present invention, rather than limitation of the present invention, related technology
The technical staff in field without departing from the spirit and scope of the present invention, can also make various conversion and change and obtain
To corresponding equivalent technical solution, therefore all equivalent technical solutions should be included into the patent protection model of the present invention
Enclose.
Claims (4)
- A kind of 1. phase laser distance measurement instrument laser pick-off circuit, it is characterised in that：Including trans-impedance amplifier and High frequency amplification Device module, frequency mixer and intermediate frequency amplification module and bandpass filter module；The trans-impedance amplifier and high-frequency amplifier module are defeated equipped with the first power end, second source end, HVB high voltage bias signal Enter end, the first signal output part and secondary signal output terminal；It is defeated that frequency mixer and intermediate frequency amplification module are equipped with power end, the first signal Enter end, secondary signal input terminal, local oscillation signal input terminal, the first signal output part and secondary signal output terminal；Bandpass filter Module is equipped with power end, the first signal input part, secondary signal input terminal and measuring signal output terminal；The power end and band of trans-impedance amplifier and the first power end of high-frequency amplifier module, frequency mixer and intermediate frequency amplification module The DC+5V power vds D of external phase laser distance measurement instrument when the power end of allpass filter block uses；Trans-impedance amplifier and height The DC-5V power supplys VCC of external phase laser distance measurement instrument when the second source end of audio amplifier module uses；Trans-impedance amplifier and The DC+160V voltage signals of external phase laser distance measurement instrument when the HVB high voltage bias signal input part of high-frequency amplifier module uses HV；The local oscillation signal input terminal of the frequency mixer and intermediate frequency amplification module local oscillator that external phase laser distance measurement instrument provides when using is believed Number Fosc input；The first signal input part and secondary signal input terminal and trans-impedance amplifier of frequency mixer and intermediate frequency amplification module And the first signal output part and secondary signal output terminal of high-frequency amplifier module corresponding electrical connection respectively；Bandpass filter module The first signal input part and secondary signal input terminal and frequency mixer and the first signal output part of intermediate frequency amplification module and second Signal output part is corresponding respectively to be electrically connected；The measuring signal output terminal output center frequency of bandpass filter module is The distance measuring signal Uout of the sine voltage form of 14.0625KHz.
- 2. phase laser distance measurement instrument laser pick-off circuit according to claim 1, it is characterised in that：It is described across resistance Amplifier and high-frequency amplifier module include resistance R1 to R6 totally 6 resistance, capacitance C1 to C15 totally 15 capacitances, APD pipes D1, Integrated chip U1 and integrated chip U2；Integrated chip U1 is the trans-impedance amplifier of MAX3658 models, it has 1 to No. 8 pin； Integrated chip U2 is the high-frequency amplifier of UA733M models, it has 1 to No. 10 pin；The HVB high voltage bias signal input part of the as described trans-impedance amplifier in one end of resistance R1 and high-frequency amplifier module；Resistance One end of the other end of R1, one end of resistance R2 and capacitance C1 is conllinear；The other end of resistance R2, one end of capacitance C2 and The anode of APD pipes D1 is conllinear；The cathode of APD pipes D1 is electrically connected with No. 2 pins of integrated chip U1；No. 3 of integrated chip U1 are drawn Foot is electrically connected with one end of capacitance C6；No. 1 pin, one end of resistance R3, one end of capacitance C4 and the capacitance of integrated chip U1 One end of C5 is conllinear；No. 4 pins of integrated chip U1 are vacant；No. 5 pins and No. 8 pins of integrated chip U1, capacitance C1 it is another One end, the other end of capacitance C2, the other end of capacitance C4, the other end of the other end of capacitance C5 and capacitance C6 are grounded；Collection No. 7 pins into chip U1 are electrically connected with one end of capacitance C7；The other end of capacitance C7, one end of resistance R4 and integrated chip No. 1 pin of U2 is conllinear；No. 6 pins of integrated chip U1 are electrically connected with one end of capacitance C8；The other end, the resistance R5 of capacitance C8 One end and integrated chip U2 No. 10 pins it is conllinear；No. 7 pins of integrated chip U2, one end of resistance R6, capacitance C10 One end and one end of capacitance C11 are conllinear；No. 4 pins of integrated chip U2, one end of resistance R7, capacitance C12 one end and One end of capacitance C13 is conllinear；One end of the other end of resistance R7, one end of capacitance C14 and capacitance C15 forms one because conllinear The second source end of a points of common connection, the as described trans-impedance amplifier of the points of common connection and high-frequency amplifier module；Collection Into the as described trans-impedance amplifier of No. 5 pins of chip U2 and the first signal output part of high-frequency amplifier module；Integrated core The secondary signal output terminal of the as described trans-impedance amplifier of No. 6 pins of piece U2 and high-frequency amplifier module；Resistance R3's is another One end, one end of capacitance C3, the other end of one end of capacitance C9 and resistance R6 form one points of common connection because conllinear, this First power end of the as described trans-impedance amplifier of points of common connection and high-frequency amplifier module；No. 2 of integrated chip U2,3 Number, No. 8 and No. 9 pins it is vacant；The other end of resistance R4, the other end of resistance R5, the other end of capacitance C3 and capacitance C9 are extremely The other end of C15 totally 7 capacitances is grounded.
- 3. phase laser distance measurement instrument laser pick-off circuit according to claim 1, it is characterised in that：The mixing Device and intermediate frequency amplification module include resistance R8 to R14 totally 7 resistance, capacitance C16 to C26 totally 11 capacitances, electrolytic capacitor C27, Electrolytic capacitor C28, integrated chip U3 and integrated chip U4；Integrated chip U3 is the double balanced mixer of SA602AD models, it has There is 1 to No. 7 pin；Integrated chip U4 is the operational amplifier of AD8616 models, it has 1 to No. 4 pin；First signal input part of the as described frequency mixer in one end of capacitance C16 and intermediate frequency amplification module；One end of capacitance C17 The as described frequency mixer and the secondary signal input terminal of intermediate frequency amplification module；The other end of capacitance C16 and capacitance C17 are with integrating No. 1 of chip U3 and the corresponding electrical connection respectively of No. 2 pins；No. 5 pins of integrated chip U3, one end of capacitance C18 and resistance One end of R8 is conllinear；No. 6 pins of integrated chip U3 are electrically connected with one end of capacitance C19；The other end, the resistance R9 of capacitance C19 One end and resistance R10 one end it is conllinear；The sheet of the as described frequency mixer of the other end of resistance R9 and intermediate frequency amplification module Shake signal input part；No. 3 pins, the other end of capacitance C18 and the other end of resistance R10 of integrated chip U3 is grounded；Collection One end of No. 4 pins, capacitance C20 into chip U3 and one end of capacitance C21 are conllinear；No. 5 pins, the capacitances of integrated chip U3 The other end of C20 and one end of capacitance C22 are conllinear；No. 7 pins of integrated chip U3 are vacant；The other end of capacitance C21 and electricity The one end for hindering R11 is electrically connected；The other end of resistance R11, one end of resistance R12, one end of capacitance C24 and integrated chip U4 No. 2 pins are conllinear；No. 1 pin of the other end of resistance R12, the other end of capacitance C24 and integrated chip U4 shape because conllinear Into a points of common connection, the first signal output part of the as described frequency mixer of the points of common connection and intermediate frequency amplification module； The other end of capacitance C22 is electrically connected with one end of resistance R13；The other end of resistance R13, one end of resistance R14, capacitance C26 No. 3 pins of one end and integrated chip U4 are conllinear；The other end of resistance R14, the other end of capacitance C26, one end of capacitance C25 And the cathode of electrolytic capacitor C27 forms a points of common connection because conllinear, which is the frequency mixer And the secondary signal output terminal of intermediate frequency amplification module；The other end of resistance R8, one end of capacitance C23 and electrolytic capacitor C28 Cathode forms a points of common connection because conllinear, the electricity of the as described frequency mixer of the points of common connection and intermediate frequency amplification module Source；The other end of capacitance C23, the anode of electrolytic capacitor C28, the other end of capacitance C25, electrolytic capacitor C27 anode and No. 4 pins of integrated chip U4 are grounded.
- 4. phase laser distance measurement instrument laser pick-off circuit according to claim 1, it is characterised in that：The band logical Filter module includes resistance R15 to R21, and totally 4 capacitances, electrolytic capacitor C33, electrolysis are electric by totally 7 resistance, capacitance C29 to C32 Hold C34, inductance L1 and integrated chip U5；Integrated chip U5 is the operational amplifier of AD8616 models, it has 1 to No. 8 pin；One end of resistance R15 is the first signal input part of the bandpass filter module；The other end, the electricity of resistance R15 The one end for hindering one end of R16, one end of capacitance C29 and capacitance C30 is conllinear；The other end of capacitance C29, one end of resistance R18 And No. 6 pins of integrated chip U5 are conllinear；The 7 of the other end of capacitance C30, the other end of resistance R18 and integrated chip U5 Number, No. 3 pins it is conllinear；The other end of resistance R16 is electrically connected with one end of resistance R17；The other end of resistance R17, resistance R19 No. 5 pins of one end, one end of resistance R20 and integrated chip U5 form a points of common connection because conllinear, the public company Contact is the secondary signal input terminal of the bandpass filter module；No. 8 pins of integrated chip U5, resistance R19 it is another One end, one end of capacitance C31, the cathode of electrolytic capacitor C33, one end of the cathode of electrolytic capacitor C34 and inductance L1 are conllinear；Electricity The other end for feeling L1 is the power end of the bandpass filter module；No. 1 of integrated chip U5, No. 2 pins and resistance One end of R21 is conllinear；The other end of resistance R21 forms a points of common connection with one end of capacitance C32 because conllinear, this is public Tie point is the measuring signal output terminal of the bandpass filter module；No. 4 pins, the electrolytic capacitors of integrated chip U5 The anode of C33, the anode of electrolytic capacitor C34, the other end of capacitance C31, the other end of capacitance C32 and resistance R20 it is another End is grounded.
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| CN112152722A (en) * | 2019-06-26 | 2020-12-29 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN113740878B (en) * | 2021-09-09 | 2023-09-22 | 南京牧镭激光科技股份有限公司 | Balance detector circuit for wind-finding radar |
| CN116990826B (en) * | 2023-09-26 | 2023-12-12 | 北京航空航天大学 | High dynamic precision laser phase range finder |
| CN117538888A (en) * | 2023-12-20 | 2024-02-09 | 中测国检(北京)科技有限责任公司 | Long range and high performance total powerstation ranging system |
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