CN107290753A - A kind of laser measurement system and method - Google Patents
A kind of laser measurement system and method Download PDFInfo
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- CN107290753A CN107290753A CN201710635430.4A CN201710635430A CN107290753A CN 107290753 A CN107290753 A CN 107290753A CN 201710635430 A CN201710635430 A CN 201710635430A CN 107290753 A CN107290753 A CN 107290753A
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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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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The present invention relates to a kind of laser measurement system and method, the equipment includes phase-locked loop circuit, modulation transmitter, optical signal receiving circuit, optical lens and phase discriminator.The phase-locked loop circuit is connected with modulation transmitter, optical signal receiving circuit and phase discriminator respectively.Laser distance measurement method, measuring beam is irradiated to testee surface, the laser signal reflected is converted into electric signal by optical lens by optical signal receiving circuit, the mixer action that the signal and local oscillation signal pass through optical signal receiving circuit, obtain low-frequency difference frequency signal, difference frequency signal is further amplified and is sent to phase discriminator and reference signal does phase bit comparison and obtains phase difference, so as to draw the distance value of testee.The present invention is worked using new single-shot list debit formula, it is not necessary to mechanical movable plate washer, it is not required that increase high frequency mixting circuit in addition, simplify circuit design, it is to avoid circuit devcie causes phase shift problem.
Description
Technical field
The present invention relates to laser technology field, and in particular to a kind of laser measurement system and method.
Background technology
Due to laser high brightness, high directivity, high monochromaticity and the advantage of high coherence so that laser range finder is extensive
Applied to fields such as building, interior decoration, industrial automations.Laser range finder key device in the market is used
Semiconductor laser and avalanche diode composition are launched and reception system, and its general operation principle is：Semiconductor laser transmitter
Launch the measuring beam through ovennodulation to testee, the measurement light that testee is reflected back is received by avalanche diode
Beam, calculates radiating laser beams and receives the phase difference of light beam, you can determine range unit the distance between to testee.By
Worked under various circumstances in rangefinder, semiconductor laser and avalanche diode are all to the more sensitive device of temperature change ratio
Part, wherein semiconductor laser operating current is larger, is more easy to generation phase drift influenced by ambient temperature, causes measurement error inclined
Greatly, tens millimeters can at most be reached.Occasion for requiring high-acruracy survey, this measurement error be it is unacceptable, because
And how to improve measurement accuracy turns into technical barrier and break through direction that laser ranging industry development faces.
The content of the invention
In view of this, in order to overcome present technical problem, the invention provides a kind of laser measurement system and method,
Improve measurement accuracy and improve the stability of a system.
To achieve the above object, technical scheme is as follows：
The present invention provides a kind of laser measurement system, it is characterised in that including：Phase-locked loop circuit, modulation transmitter, optical signal
Receiving circuit, optical lens and phase discriminator, the phase-locked loop circuit respectively with modulation transmitter, optical signal receiving circuit and mirror
Phase device is connected, for producing high-frequency signal, local oscillation signal and reference signal；The modulation transmitter is used to access high-frequency signal
And produce measuring beam；The optical signal receiving circuit is used to access local oscillation signal and receives the laser focused on by optical lens
Reflected signal, difference frequency signal is obtained through mixing；The phase discriminator is used to receive reference signal and difference frequency signal, and by reference signal
Enter line phase with difference frequency signal and relatively obtain phase difference, and then draw the distance value of testee.
Further, the modulation transmitter includes semiconductor laser tube and automatically controls current module, described partly to lead
Volumetric laser pipe is used to access high-frequency signal and modulates generation measuring beam, and the current module that automatically controls is used to control work electricity
The size of stream.
Further, the optical signal receiving circuit includes avalanche diode and photoelectric tube, the avalanche diode access
Local oscillation signal, the photoelectric tube, which has, to be received and mixing double action, is received reflected light signal and is converted into the same of high frequency electrical signal
When, and the high frequency electrical signal and local oscillation signal are mixed, demodulate low-frequency difference frequency signal.
Further, the optical signal receiving circuit also includes difference frequency signal amplifying circuit, is arranged on optical signal and receives electricity
Between road and phase discriminator, for being amplified processing to the difference frequency signal that optical signal receiving circuit is exported.
In addition, the present invention also provides a kind of laser measurement method, including：
Phase-locked loop circuit output high-frequency signal, local oscillation signal and reference signal；
It is medium to be compared that reference signal is sent to phase discriminator；
Measuring beam is produced after the modulated radiating circuit processing of high-frequency signal；
Measuring beam is irradiated to testee surface, and the laser signal then reflected is received by optical signal receiving circuit, light
Signal receiving circuit accesses local oscillation signal simultaneously, and difference frequency signal is obtained through mixing；
By difference frequency signal amplifying circuit, further amplification is sent in phase discriminator difference frequency signal；
Reference signal does phase bit comparison with difference frequency signal and obtains phase difference in phase discriminator, and then draws the distance value of testee.
From such scheme, the present invention is worked using new single-shot list debit formula, it is not necessary to mechanical movable shelves
Plate, it is not required that increase high frequency mixting circuit in addition, simplify circuit design, it is to avoid circuit devcie causes phase shift problem；Only
Using a laser diode modulation transmitter, unit cost is reduced, production procedure is reduced, also improves production efficiency.
Brief description of the drawings
The laser measurement system structural representation that Fig. 1 provides for one embodiment of the invention.
The laser measurement system structural representation that Fig. 2 provides for another embodiment of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, clear, complete description is carried out to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only
Only it is a part of embodiment of the invention, rather than whole embodiments.Based on embodiments of the invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
With reference to the accompanying drawings, the embodiment to various aspects of the present invention is described in further detail.
The structural representation for the laser measurement system that Fig. 1 provides for one embodiment of the invention.
As shown in figure 1, controlling phase-locked loop circuit to produce high-frequency signal and local oscillation signal by software, its high frequency signal is adjusted
Make and measuring beam is produced in semiconductor laser tube, local oscillation signal is fed on the avalanche diode of optical signal receiving circuit, lock
Phase loop circuit also produces a reference signal simultaneously, is used as the bit comparison of phase discriminator phase.
Base reference signal is directly provided using phase-locked loop circuit is to the benefit of phase discriminator, it is to avoid signal is by multistage
Phase jitter and drift are caused during processing of circuit, facilitates circuit sampling synchronous, than replacing interior light path using electric mixing schemes
Signal is more stable, significantly improves phase drift problem.
When carrying out range measurement, the measuring beam of brewed high-frequency signal is irradiated to testee surface, is reflected back
The laser signal come is focused on by optical lens, is received by optical signal receiving circuit and is converted into electric signal, the electric signal and local oscillator
Signal obtains low-frequency difference frequency signal by mixer action, and by the signal, further amplification is sent to phase discriminator and reference signal
Do phase bit comparison and obtain phase difference, so as to draw the distance value of measured object.
This novel circuit design directly produces base reference signal using phase-locked loop circuit, high using photoelectric tube cut-off frequency
Up to 2GHz high frequency characteristics, by receiving circuit design with receiving and being mixed double action, receive reflected light signal and be converted into height
While frequency electric signal, and the high frequency electrical signal and high-frequency local oscillation signal are mixed, demodulate low-frequency difference frequency signal,
Phase discriminator sampling processing is sent into after amplification.
This programme greatly simplifies circuit design, it is to avoid signal is asked by the possible caused phase shift of multiple circuit links
Topic, while also reducing caused phase drift affected by environment, improves measurement accuracy.The reference that phase-locked loop circuit is directly produced
Reference signal, can be directly accessed phase discriminator sampling and use, by controlling switch can also be respectively connected to phase demodulation with difference frequency signal
Device sampling is used.
The structural representation for the laser measurement system that Fig. 2 provides for another embodiment of the present invention.
For modulation transmitter by phase drift caused by environmental change, by detecting modulation transmitter work electricity
Stream, current module FREQUENCY CONTROL modulation transmitter operating current is automatically controlled by software adjustment.
As shown in Fig. 2 R1 is modulation transmitter operating current sample resistance, it is real to be sent to single-chip microcomputer LD_DET interfaces through R2
When detect modulation transmitter operating current, software output PWM_OUT waveforms Q1 transistor bases, Q1 colelctor electrodes are connected to by R3
Modulation transmitter is connect, RF_MOD high-frequency modulation signals are modulated on modulation transmitter by C2.When modulation transmitter by
Environmental change causes operating current to change with working time heating, and software changes in real time according to detection operating current size
Become output control automatically current module waveform duty cycle, automatically control modulation transmitter operating current so as to realize, make modulation
Radiating circuit working stability, reduces and produces phase drift, improves measurement accuracy.
In summary, the present invention is worked using new single-shot list debit formula, it is not necessary to mechanical movable plate washer, also not
Need to increase high frequency mixting circuit in addition, simplify circuit design, it is to avoid circuit devcie causes phase shift problem；Only with one
Modulation transmitter, reduces unit cost, reduces production procedure, also improves production efficiency.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (5)
1. a kind of laser measurement system, it is characterised in that：Including phase-locked loop circuit, modulation transmitter, optical signal receiving circuit,
Optical lens and phase discriminator, the phase-locked loop circuit are connected with modulation transmitter, optical signal receiving circuit and phase discriminator respectively,
For producing high-frequency signal, local oscillation signal and reference signal；The modulation transmitter is used to access high-frequency signal and produces survey
Measure light beam；The optical signal receiving circuit is used to access local oscillation signal and receives the laser reflection letter focused on by optical lens
Number, obtain difference frequency signal through mixing；The phase discriminator is used to receive reference signal and difference frequency signal, and by reference signal and difference frequency
Signal enters line phase and relatively obtains phase difference, and then draws the distance value of testee.
2. laser measurement system according to claim 1, it is characterised in that：The modulation transmitter swashs including semiconductor
Light pipe is used to access high-frequency signal and modulates generation measuring beam, institute with current module, the semiconductor laser tube is automatically controlled
State and automatically control the size that current module is used to control operating current.
3. laser measurement system according to claim 1, it is characterised in that：The optical signal receiving circuit includes snowslide two
Pole pipe and photoelectric tube, the avalanche diode access local oscillation signal, and the photoelectric tube, which has, to be received and mixing double action, is received
While reflected light signal is converted into high frequency electrical signal, and the high frequency electrical signal and local oscillation signal are mixed, demodulated low
The difference frequency signal of frequency.
4. laser measurement system according to claim 3, it is characterised in that：The optical signal receiving circuit also includes difference frequency
Signal amplification circuit, is arranged between optical signal receiving circuit and phase discriminator, for the difference frequency exported to optical signal receiving circuit
Signal is amplified processing.
5. the laser measurement method described in a kind of use claim 1, it is characterised in that including：Phase-locked loop circuit exports high frequency
Signal, local oscillation signal and reference signal；It is medium to be compared that reference signal is sent to phase discriminator；At the modulated radiating circuit of high-frequency signal
Measuring beam is produced after reason；Measuring beam is irradiated to testee surface, and the laser signal then reflected is connect by optical signal
Receive circuit to receive, optical signal receiving circuit accesses local oscillation signal simultaneously, difference frequency signal is obtained through mixing；Difference frequency signal passes through difference frequency
Further amplification is sent in phase discriminator signal amplification circuit；Reference signal does phase bit comparison with difference frequency signal and obtains phase in phase discriminator
Potential difference, and then draw the distance value of testee.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710635430.4A CN107290753A (en) | 2017-07-31 | 2017-07-31 | A kind of laser measurement system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710635430.4A CN107290753A (en) | 2017-07-31 | 2017-07-31 | A kind of laser measurement system and method |
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| CN107290753A true CN107290753A (en) | 2017-10-24 |
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| CN201710635430.4A Pending CN107290753A (en) | 2017-07-31 | 2017-07-31 | A kind of laser measurement system and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828615A (en) * | 2018-06-11 | 2018-11-16 | 深圳市镭神智能系统有限公司 | Light emitting unit, optical signal detecting module, optical system and laser radar system |
| CN109031254A (en) * | 2018-09-28 | 2018-12-18 | 黄耀勇 | Ranging calibration method, device and measuring system |
| CN109283546A (en) * | 2018-12-12 | 2019-01-29 | 唐之初 | A kind of novel phase type laser ranging system and method |
| CN110716193A (en) * | 2019-12-12 | 2020-01-21 | 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 |
-
2017
- 2017-07-31 CN CN201710635430.4A patent/CN107290753A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828615A (en) * | 2018-06-11 | 2018-11-16 | 深圳市镭神智能系统有限公司 | Light emitting unit, optical signal detecting module, optical system and laser radar system |
| CN109031254A (en) * | 2018-09-28 | 2018-12-18 | 黄耀勇 | Ranging calibration method, device and measuring system |
| CN109283546A (en) * | 2018-12-12 | 2019-01-29 | 唐之初 | A kind of novel phase type laser ranging system and method |
| US11747474B2 (en) | 2019-11-18 | 2023-09-05 | Shenzhen Mileseey Technology Co., Ltd. | Systems and methods for laser distance measurement |
| CN110716193A (en) * | 2019-12-12 | 2020-01-21 | 深圳市迈测科技股份有限公司 | Signal generation 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 |
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Application publication date: 20171024 |
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| WD01 | Invention patent application deemed withdrawn after publication |