CN209373109U - A kind of phase distancemeter - Google Patents
A kind of phase distancemeter Download PDFInfo
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- CN209373109U CN209373109U CN201821679536.0U CN201821679536U CN209373109U CN 209373109 U CN209373109 U CN 209373109U CN 201821679536 U CN201821679536 U CN 201821679536U CN 209373109 U CN209373109 U CN 209373109U
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Abstract
The utility model discloses a kind of phase distancemeter, comprising: ray machine ontology, light-sensitive device, laser, temperature-compensating accept filter amplifying circuit, receive eyeglass, single-chip microcontroller, frequency mixer and phase-locked loop circuit；Laser emits the first light wave to testee surface, is radiated on the reception eyeglass after testee reflects, received eyeglass is received by light-sensitive device；The first low frequency signal is obtained after the temperature compensated amplifying circuit amendment that accepts filter, the first low frequency signal is input to single-chip microcontroller and obtains first phase；Phase-locked loop circuit generates the first high-frequency signal and the second high-frequency signal, generates the second low frequency signal after frequency mixer mixing, the second low frequency signal is input to the single-chip microcontroller and obtains second phase；It makes the difference the first phase and the second phase to obtain testing distance.Phase distance meter in the utility model is accepted filter amplifying circuit by the way that temperature-compensating is arranged, and can be corrected light-sensitive device because of measurement error caused by temperature difference, be improved measurement accuracy.
Description
Technical field
The utility model relates to ranging fields, more particularly to a kind of phase distancemeter.
Background technique
Phase distancemeter is the waveform modulated by certain frequency on light beam, when light beam is radiated on testee simultaneously quilt
After reflexing to reception device, by calculate transmitting and time of reception light beam phase difference come determine between testee and light source away from
From.Currently, the implementation of phase distancemeter is mainly include the following types: single-emission and double-receiving, double bills receipts, single-shot in the prior art
It is single to receive (motor switching), single-shot list receipts (thermistor compensation), single-shot list receipts (LED scheme).Single-emission and double-receiving and double bills receive tool
Have the advantages that precision is high, temperature drift is small, but its is at high cost, it is higher for the coherence request of two light-sensitive devices therein.It is single
Bill, which receives (motor switching), has many advantages, such as that precision is high, temperature drift is small, but its is at high cost, and it is with structure movement device, can
It is low by property.Single-shot list receives (thermistor compensation) although still its temperature drift is big fastly at low cost, measuring speed, and soft compensation consistency is not
It is good.Single-shot list receives (LED scheme), at low cost, measuring speed is fast, but its temperature drift is big.Therefore, it is necessary to provide a kind of phase survey
Distance meter, to solve the problems such as above-mentioned at high cost, temperature drift is big, reliability is low.
Summary of the invention
The purpose of the utility model is to provide a kind of phase distancemeters, correct light-sensitive device because surveying caused by temperature difference
Error is measured, measurement accuracy is improved.
To achieve the above object, the utility model provides following scheme:
A kind of phase distancemeter, the rangefinder include: ray machine ontology, light-sensitive device, laser, temperature-compensating reception
Filter amplification circuit receives eyeglass, single-chip microcontroller, frequency mixer and phase-locked loop circuit；
The laser emits the first light wave to testee surface, and first light wave irradiates after testee reflects
On the reception eyeglass, received through the reception eyeglass by the light-sensitive device；It accepts filter amplification through the temperature-compensating
The first low frequency signal is obtained after circuit modifications, and first low frequency signal is input to the single-chip microcontroller and obtains first phase；
The phase-locked loop circuit generates the first high-frequency signal and the second high-frequency signal, first high-frequency signal and described the
Two high-frequency signals generate the second low frequency signal after frequency mixer mixing, and second low frequency signal is input to the single-chip microcontroller
Obtain second phase；
It makes the difference the first phase and the second phase to obtain testing distance.
Optionally, the temperature-compensating amplifying circuit that accepts filter specifically includes: the first power supply, second source, third electricity
Source, the 4th power supply, diode D1, thermistor R503, first resistor R585, second resistance R509,3rd resistor R550, the 4th
Resistance R560, the 5th resistance R529, the 6th resistance R552, the 7th resistance R646, first capacitor C537, the second capacitor C510,
Three capacitor C529, the 4th capacitor C590, the 5th capacitor C574, the first operational amplifier U22A and second operational amplifier U22B；
The anode of the diode D1 is connect with the inverting input terminal of the first operational amplifier U22A, first fortune
It calculates the non-inverting input terminal of amplifier U22A and one end of the second capacitor C510 and one end of the 3rd resistor R550 connects
It connects, the other end connect and ground of the ground terminal of the first operational amplifier U22A and the second capacitor C510, described
The power end of one operational amplifier U22A connect with first power supply and connect with one end of the first capacitor C573, described
The other end of first capacitor C573 is grounded；The inverting input terminal of the first operational amplifier U22A also with the first resistor
One end of R585 connects, and the other end of the first resistor R585 is connect with one end of the thermistor R503, the temperature-sensitive
One end of the output end and the 7th resistance R646 of the other end of resistance R503 and the first operational amplifier U22A connects
It connects；
One end of the second resistance R509 is connect with the third power supply, the other end of the second resistance R509 with
One end of the 3rd resistor R550 connects, the other end ground connection of the 3rd resistor R 550；
The other end of the 7th resistance R646 and one end of the third capacitor R592 and the 4th capacitor R590 connect
It connects, the other end of the third capacitor C592 and one end of the 4th resistance R560 and the second operational amplifier U22B's
Output end connection, the other end of the 4th capacitor C590 and the inverting input terminal of the second operational amplifier U22B and institute
State the other end connection of the 4th resistance R560, the non-inverting input terminal of the second operational amplifier U22B and the 5th capacitor
One end of C574 connects, the other end ground connection of the 5th capacitor C574, the power end of the second operational amplifier U22B with
Second source connection, the ground terminal ground connection of the second operational amplifier U22B, one end of the 5th resistance R529 with
4th power supply connection, the other end of the 5th resistance R529 are connect with one end of the 6th resistance R552, and described the
The other end of six resistance R552 is grounded.
Optionally, the rangefinder further include: light emitting diode, the light emitting diode emit the second light wave through the light
It after machine proprioceptive reflex, is radiated on the light-sensitive device and is received by the light-sensitive device, second light wave is through the photosensor
Third low frequency signal is generated after part.
Optionally, the light-sensitive device is avalanche photodide.
Optionally, first light wave is the first high-frequency signal, and second light wave is the first low frequency signal.
Optionally, the third low frequency signal is for adjusting light-sensitive device.
According to specific embodiment provided by the utility model, the utility model discloses following technical effects:
In the utility model, accepted filter amplifying circuit by the way that temperature-compensating is arranged in rangefinder, and in temperature-compensating
Accept filter and introduce thermistor in amplifying circuit, by thermistor can in compensation under different temperatures environment measurement result
Error, temperature drift is reduced to 0.1mm/ DEG C~0.15mm/ DEG C, it is specified at different temperatures to greatly improve rangefinder
Measurement accuracy.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without any creative labor, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the utility model embodiment phase distancemeter structural schematic diagram；
Fig. 2 is that the utility model embodiment temperature-compensating accepts filter amplification circuit structure schematic diagram.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
The purpose of the utility model is to provide a kind of phase distancemeters, correct light-sensitive device because surveying caused by temperature difference
Error is measured, measurement accuracy is improved.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
Fig. 1 is the utility model embodiment phase distancemeter structural schematic diagram, as shown in Figure 1, the phase shift rangefinder
Instrument include: ray machine ontology 1, light-sensitive device 2, laser 3, light emitting diode 4, temperature-compensating accept filter amplifying circuit 5, receive
Eyeglass 6, single-chip microcontroller, frequency mixer；
The rangefinder include: ray machine ontology 1, light-sensitive device 2, laser 3, temperature-compensating accept filter amplifying circuit 5,
Receive eyeglass 6, single-chip microcontroller, frequency mixer (not shown), phase-locked loop circuit (not shown)；
The laser 3 emits the first light wave to testee surface, and first light wave shines after testee reflects
It penetrates on the reception eyeglass 6, is received through the reception eyeglass 6 by the light-sensitive device 2；It accepts filter through the temperature-compensating
Amplifying circuit 5 obtains the first low frequency signal after correcting, and first low frequency signal is input to the single-chip microcontroller and obtains the first phase
Position；
The phase-locked loop circuit generates the first high-frequency signal and the second high-frequency signal, first high-frequency signal and described the
Two high-frequency signals generate the second low frequency signal after frequency mixer mixing, and second low frequency signal is input to the single-chip microcontroller
Obtain second phase；
It makes the difference the first phase and the second phase to obtain testing distance.
Specifically, the rangefinder further include: light emitting diode 4, the light emitting diode 4 emit the second light wave through institute
It after stating ray machine proprioceptive reflex, is radiated on the light-sensitive device and is received by the light-sensitive device 2, second light wave is through the light
Third low frequency signal is generated after sensing device 2.
The third low frequency signal is used to adjust the operating point of light-sensitive device, is not involved in direct range calculating.This is practical new
Scheme in type is to belong to one kind (laser and a light-sensitive device) of single-shot list receipts, is received compared to other single-shot lists
Scheme, advantage are: other single-shot list debit cases adjust the operating point of light-sensitive device using temperature sensor.Due to temperature
Degree sensor and light-sensitive device spatially have certain distance and light-sensitive device itself that can generate heat, and lead to temperature sensor
Temperature can't respond very accurately the temperature of light-sensitive device, so that eventually leading to the operating point inaccuracy of light-sensitive device influences ranging
Precision.It is to be radiated on light-sensitive device using the light of a fixing intensity in the utility model, generates third low frequency signal, according to the
The size of three low frequency signals adjusts the operating point of light-sensitive device, and this mode is opposite accurately more.
Specifically, exporting two-way high-frequency signal by single-chip microcontroller control phaselocked loop, f0 and f1, f0 are modulated on laser, f1
It is modulated on light-sensitive device 2.Since light-sensitive device 2 needs work under a higher voltage, and the most suitable work of light-sensitive device 2
Voltage can be changed with variation of ambient temperature.A low frequency signal is modulated on a light emitting diode, and the one of light emitting diode sending is solid
The light beam for determining intensity reaches light-sensitive device 2 after inner body wall reflects, and the signal of light-sensitive device connects by hardware temperatures compensation
Single-chip microcontroller calculating signal magnitude is inputed to after receiving filter amplification circuit 5.In ranging process, first opens light emitting diode and adjust simultaneously
Whole 2 both end voltage of light-sensitive device, until signal and preset value one after hardware temperatures compensation accepts filter amplifying circuit 5
It causes.
Fig. 2 is that the utility model embodiment temperature-compensating accepts filter amplification circuit structure schematic diagram, as shown in Fig. 2, institute
It states the temperature-compensating amplifying circuit that accepts filter to specifically include: the first power supply, second source, third power supply, the 4th power supply, diode
D1, thermistor R503, first resistor R585, second resistance R509,3rd resistor R550, the 4th resistance R560, the 5th resistance
R529, the 6th resistance R552, the 7th resistance R646, first capacitor C537, the second capacitor C510, third capacitor C529, the 4th electricity
Hold C590, the 5th capacitor C574, the first operational amplifier U22A, second operational amplifier U22B；
The anode of the diode D1 is connect with the inverting input terminal of the first operational amplifier U22A, first fortune
It calculates the non-inverting input terminal of amplifier U22A and one end of the second capacitor C510 and one end of the 3rd resistor R550 connects
It connects, the other end connect and ground of the ground terminal of the first operational amplifier U22A and the second capacitor C510, described
The power end of one operational amplifier U22A is connected in first power supply and is connect with one end of the first capacitor C573, described
The other end of first capacitor C573 is grounded；The inverting input terminal of the first operational amplifier U22A also with the first resistor
One end of R585 connects, and the other end of the first resistor R585 is connect with one end of the thermistor R503, the temperature-sensitive
One end of the output end and the 7th resistance R646 of the other end of resistance R503 and the first operational amplifier U22A connects
It connects；
One end of the second resistance R509 is connect with the third power supply, the other end of the second resistance R509 with
One end of the 3rd resistor R550 connects, the other end ground connection of the 3rd resistor R 550；
The other end of the 7th resistance R646 and one end of the third capacitor R592 and the 4th capacitor R590 connect
It connects, the other end of the third capacitor C592 and one end of the 4th resistance R560 and the second operational amplifier U22B's
Output end connection, the other end of the 4th capacitor C590 and the inverting input terminal of the second operational amplifier U22B and institute
State the other end connection of the 4th resistance R560, the non-inverting input terminal of the second operational amplifier U22B and the 5th capacitor
One end of C574 connects, the other end ground connection of the 5th capacitor C574, the power end of the second operational amplifier U22B with
Second source connection, the ground terminal ground connection of the second operational amplifier U22B, one end of the 5th resistance R529 with
4th power supply connection, another section of the 5th resistance R529 are connect with one end of the 6th resistance R552, and described the
The other end of six resistance R552 is grounded.
Due to during ranging, if distance measurement result can show well under metastable temperature environment.But
Under different temperatures environment, precision has apparent fluctuation.In the case where not using software correction, measurement result has 0.5mm/
DEG C temperature drift.After software correction, still rear 0.3mm/ DEG C of temperature drift.There are two the main reason for temperature drift:
Light-sensitive device varies with temperature signal code and noise current accordingly changes, and hardware temperatures compensation accepts filter in amplifying circuit
The input bias current of operational amplifier varies with temperature.In order to solve temperature drift problems, therefore, connect in hardware temperatures compensation
It receives in filter amplification circuit and introduces a thermistor, the error of measurement result under thermistor compensation different temperatures environment can incite somebody to action
Temperature drift is reduced to 0.1mm/ DEG C~0.15mm/ DEG C, greatly promotes distance-measuring equipment and shows at different temperatures.
Specifically, the light-sensitive device is avalanche photodide.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Specific case used herein is expounded the principles of the present invention and embodiment, above embodiments
Explanation be merely used to help understand the method and its core concept of the utility model；Meanwhile for the general technology of this field
Personnel, based on the idea of the present invention, there will be changes in the specific implementation manner and application range.In conclusion
The content of the present specification should not be construed as a limitation of the present invention.
Claims (6)
1. a kind of phase distancemeter, which is characterized in that the rangefinder includes: ray machine ontology, light-sensitive device, laser, temperature
Degree compensates the amplifying circuit that accepts filter, receives eyeglass, single-chip microcontroller, frequency mixer and phase-locked loop circuit；
The laser emits the first light wave to testee surface, and first light wave is radiated at institute after testee reflects
It states and receives on eyeglass, received through the reception eyeglass by the light-sensitive device；It accepts filter amplifying circuit through the temperature-compensating
The first low frequency signal is obtained after amendment, and first low frequency signal is input to the single-chip microcontroller and obtains first phase；
The phase-locked loop circuit generates the first high-frequency signal and the second high-frequency signal, first high-frequency signal and described second high
Frequency signal generates the second low frequency signal after frequency mixer mixing, and second low frequency signal is input to the single-chip microcontroller and obtains
Second phase；
It makes the difference the first phase and the second phase to obtain testing distance.
2. phase distancemeter according to claim 1, which is characterized in that the temperature-compensating accepts filter amplifying circuit
It specifically includes: the first power supply, second source, third power supply, the 4th power supply, diode D1, thermistor R503, first resistor
R585, second resistance R509,3rd resistor R550, the 4th resistance R560, the 5th resistance R529, the 6th resistance R552, the 7th electricity
Hinder R646, first capacitor C537, the second capacitor C510, third capacitor C529, the 4th capacitor C590, the 5th capacitor C574, first
Operational amplifier U22A and second operational amplifier U22B；
The anode of the diode D1 is connect with the inverting input terminal of the first operational amplifier U22A, and first operation is put
The non-inverting input terminal of big device U22A is connect with one end of one end of the second capacitor C510 and the 3rd resistor R550, institute
State the ground terminal of the first operational amplifier U22A and the other end connect and ground of the second capacitor C510, first operation
The power end of amplifier U22A connect with first power supply and connect with one end of the first capacitor C573, first electricity
Hold the other end ground connection of C573；The inverting input terminal of the first operational amplifier U22A also with the first resistor R585 one
End connection, the other end of the first resistor R585 are connect with one end of the thermistor R503, the thermistor R503
The other end connect with one end of the output end of the first operational amplifier U22A and the 7th resistance R646；
One end of the second resistance R509 is connect with the third power supply, the other end of the second resistance R509 and described the
One end of three resistance R550 connects, the other end ground connection of the 3rd resistor R550；
The other end of the 7th resistance R646 is connect with one end of the third capacitor R592 and the 4th capacitor R590, institute
State the other end and one end of the 4th resistance R560 and the output of the second operational amplifier U22B of third capacitor C592
End connection, the other end of the 4th capacitor C590 and the inverting input terminal of the second operational amplifier U22B and described the
The other end of four resistance R560 connects, and the non-inverting input terminal of the second operational amplifier U22B is with the 5th capacitor C574's
One end connection, the other end ground connection of the 5th capacitor C574, the power end of the second operational amplifier U22B and described the
The connection of two power supplys, the ground terminal ground connection of the second operational amplifier U22B, one end of the 5th resistance R529 and described the
The connection of four power supplys, the other end of the 5th resistance R529 are connect with one end of the 6th resistance R552, the 6th resistance
The other end of R552 is grounded.
3. phase distancemeter according to claim 1, which is characterized in that the rangefinder further include: light emitting diode,
The light emitting diode emits the second light wave after the ray machine proprioceptive reflex, is radiated on the light-sensitive device by described photosensitive
Device receives, and second light wave generates third low frequency signal after the light-sensitive device.
4. phase distancemeter according to claim 1, which is characterized in that the light-sensitive device is two pole of avalanche optoelectronic
Pipe.
5. phase distancemeter according to claim 3, which is characterized in that first light wave is the first high-frequency signal,
Second light wave is the first low frequency signal.
6. phase distancemeter according to claim 3, which is characterized in that the third low frequency signal is photosensitive for adjusting
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821679536.0U CN209373109U (en) | 2018-10-17 | 2018-10-17 | A kind of phase distancemeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821679536.0U CN209373109U (en) | 2018-10-17 | 2018-10-17 | A kind of phase distancemeter |
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| CN209373109U true CN209373109U (en) | 2019-09-10 |
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| CN201821679536.0U Active CN209373109U (en) | 2018-10-17 | 2018-10-17 | A kind of phase distancemeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164455A (en) * | 2018-10-17 | 2019-01-08 | 杭州隆硕科技有限公司 | A kind of phase distancemeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164455A (en) * | 2018-10-17 | 2019-01-08 | 杭州隆硕科技有限公司 | A kind of phase distancemeter |
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Address after: 311500 building 3, No. 788, Jintang Road, Jiangnan Town, Tonglu County, Hangzhou City, Zhejiang Province Patentee after: Hangzhou long Shuo Technology Co., Ltd. Address before: 310000 2, 3 floor, 3 Yufeng Road, 7 Yuhang, Hangzhou, Zhejiang. Patentee before: Hangzhou long Shuo Technology Co., Ltd. |