CN106646502A - Novel laser ranging device and method - Google Patents
Novel laser ranging device and method Download PDFInfo
- Publication number
- CN106646502A CN106646502A CN201610991374.3A CN201610991374A CN106646502A CN 106646502 A CN106646502 A CN 106646502A CN 201610991374 A CN201610991374 A CN 201610991374A CN 106646502 A CN106646502 A CN 106646502A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 29
- 230000010355 oscillation Effects 0.000 claims abstract description 16
- 239000004065 semiconductor Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 6
- 230000010363 phase shift Effects 0.000 abstract description 4
- 230000004888 barrier function Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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
- G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S17/36—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated with phase comparison between the received signal and the contemporaneously transmitted signal
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- Physics & Mathematics (AREA)
- 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 invention relates to a novel laser ranging device and method. The invention is characterized in that the device includes a phase-locked loop circuit, a modulation emitting circuit, an optical signal receiving circuit, an optical lens and a phase discriminator, wherein the phase-locked loop circuit is connected with the modulation emitting circuit, the optical signal receiving circuit and the phase discriminator. According to the laser ranging method, measurement light beams are irradiated to the surface of a to-be-measured object. Laser signals reflected back are converted to electric signals through the optical signal receiving circuit. Through frequency mixing of said signals and the local oscillation signals by the optical signal receiving circuit, lower frequency difference frequency signals are obtained. The difference frequency signals further amplified and sent to the phase discriminator for comparison with the reference signals so as to obtain phase difference, so that the distance value of the to-be-measured object is obtained. According to the invention, by adopting a novel single-transceiving and single-receiving method for working, no mechanical movable barrier board is needed and no external high frequency mixing circuit is needed additionally. Circuit design is simplified and phase shift caused by circuit devices is avoided.
Description
Technical field
The present invention relates to phase laser distance measurement field, and in particular to a kind of new pattern laser distance-measuring equipment and method.
Background technology
Due to the advantage of laser high brightness, high directivity, high monochromaticity and high coherence so that laser range finder is extensive
It is applied to the fields such as building, interior decoration, industrial automation.Laser range finder key device in the market is adopted
Semiconductor laser and avalanche diode composition are launched and reception system, and its general operation principle is：Semiconductor laser transmitter
Transmitting passes through the measuring beam of modulation on testee, and by avalanche diode the measurement light that testee is reflected back is received
Beam, calculates the phase difference of radiating laser beams and receiving light beam, you can determine range unit the distance between to testee.By
Work under various circumstances in rangefinder, semiconductor laser and avalanche diode are all than more sensitive device to temperature change
Part, wherein semiconductor laser operating current is larger, is more easy to generation phase drift influenced by ambient temperature, causes measure error inclined
Greatly, tens millimeters can at most be reached.For the occasion for requiring high-acruracy survey, this measure error be it is unacceptable, because
And how to improve certainty of measurement becomes technical barrier and the 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 new pattern laser distance-measuring equipment and
Method, improves certainty of measurement and improves the stability of a system.
For achieving the above object, technical scheme is as follows：
The present invention provides a kind of new pattern laser distance-measuring equipment, it is characterised in that include：Phase-locked loop circuit, modulate emission electricity
Road, optical signal receiving circuit, optical lens and phase discriminator, the phase-locked loop circuit connects respectively with modulation transmitter, optical signal
Circuit and phase discriminator connection are received, for producing high-frequency signal, local oscillation signal and reference signal；The modulation transmitter is used to connect
Enter high-frequency signal and produce measuring beam；The optical signal receiving circuit is used to access local oscillation signal and receives through optical lens
The laser reflection signal of focusing, Jing mixing obtains difference frequency signal；The phase discriminator is used to receive reference signal and difference frequency signal, and
Reference signal and difference frequency signal are entered into line phase and relatively obtains phase difference, and then draw the distance value of testee.
Further, the modulation transmitter is including 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, described to automatically control current module for controlling work electricity
The size of stream.
Further, the optical signal receiving circuit includes avalanche diode and photoelectric tube, and the avalanche diode is accessed
Local oscillation signal, the photoelectric tube has reception and is mixed double action, receives 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 process to the difference frequency signal that optical signal receiving circuit is exported.
In addition, the present invention also provides a kind of new pattern laser distance-finding 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；
The modulated radiating circuit of high-frequency signal produces measuring beam after processing；
Measuring beam is irradiated to testee surface, and the laser signal for then reflecting is connect by optical signal receiving circuit
Receive, optical signal receiving circuit accesses local oscillation signal simultaneously, Jing mixing obtains difference frequency signal；
By difference frequency signal amplifying circuit, further amplification is sent in phase discriminator difference frequency signal；
Reference signal does phase bit comparison and obtains phase difference with difference frequency signal in phase discriminator, and then draws the distance of testee
Value.
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, reduce production procedure, also improve production efficiency.
Description of the drawings
The structural representation of the new pattern laser distance-measuring equipment that Fig. 1 is provided for one embodiment of the invention.
The structural representation of the new pattern laser distance-measuring equipment that Fig. 2 is provided for another embodiment of the present invention.
Specific embodiment
To make purpose, technical scheme and the 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 the embodiment of whole.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 specific embodiment of various aspects of the present invention is described in further detail.
The structural representation of the new pattern laser distance-measuring equipment that Fig. 1 is provided for one embodiment of the invention.
As shown in figure 1, controlling phase-locked loop circuit by software produces high-frequency signal and local oscillation signal, its high frequency signal is adjusted
Make and produce in semiconductor laser tube measuring beam, local oscillation signal is fed on the avalanche diode of optical signal receiving circuit, lock
Phase loop circuit also produces a reference signal simultaneously, uses as the bit comparison of phase discriminator phase.
Directly to provide base reference signal using phase-locked loop circuit be to the benefit of phase discriminator, it is to avoid signal is through multistage
Phase jitter and drift are caused during processing of circuit, facilitates circuit sampling synchronization, than replacing interior light path using electric mixing schemes
Signal is more stable, significantly improves phase drift problem.
When range measurement is carried out, the measuring beam of brewed high-frequency signal is irradiated to into testee surface, is reflected back
The laser signal for coming 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, the signal is further amplified and 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 the high frequency characteristics of 2GHz, receiving circuit design is had and receives and be mixed double action, received 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, are demodulated 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 phase shift caused by multiple circuit links are possible is asked
Topic, while also reducing caused phase drift affected by environment, improves certainty of measurement.The reference that phase-locked loop circuit is directly produced
Reference signal, can be directly accessed phase discriminator sampling and use, it is also possible to be respectively connected to phase demodulation by controlling switch with difference frequency signal
Device sampling is used.
The structural representation of the new pattern laser distance-measuring equipment that Fig. 2 is provided for another embodiment of the present invention.
For the phase drift that modulation transmitter is caused by environmental change, by detecting modulation transmitter work electricity
Stream, by software adjustment current module FREQUENCY CONTROL modulation transmitter operating current is automatically controlled.
As shown in Fig. 2 R1 is modulation transmitter operating current sample resistance, Jing R2 are sent to single-chip microcomputer LD_DET interface realities
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 is received
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, so as to realize automatically controlling modulation transmitter operating current, make modulation
Radiating circuit working stability, reduces and produces phase drift, improves certainty of measurement.
In sum, 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 its description is more concrete and detailed, but and
Therefore the restriction 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, some deformations and improvement can also be made, these belong to the guarantor of the present invention
Shield scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (5)
1. a kind of new pattern laser distance-measuring equipment, it is characterised in that：Receive including phase-locked loop circuit, modulation transmitter, optical signal
Circuit, optical lens and phase discriminator, the phase-locked loop circuit respectively with modulation transmitter, optical signal receiving circuit and phase discriminator
Connection, 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 the laser reflection signal that local oscillation signal and reception are focused on through optical lens, Jing
Mixing obtains difference frequency signal；
The phase discriminator compares for receiving reference signal and difference frequency signal, and reference signal and difference frequency signal being entered into line phase
To phase difference, and then draw the distance value of testee.
2. new pattern laser distance-measuring equipment according to claim 1, it is characterised in that：The modulation transmitter includes partly leading
Volumetric laser pipe is used to access high-frequency signal and modulate generation to measure light with current module, the semiconductor laser tube is automatically controlled
Beam, it is described to automatically control current module for controlling the size of operating current.
3. new pattern laser distance-measuring equipment according to claim 1, it is characterised in that：The optical signal receiving circuit includes snow
Diode and photoelectric tube are collapsed, the avalanche diode accesses local oscillation signal, and the photoelectric tube has reception and is mixed double action,
While reception reflected light signal is converted into high frequency electrical signal, and the high frequency electrical signal and local oscillation signal are mixed, are demodulated
Go out low-frequency difference frequency signal.
4. new pattern laser distance-measuring equipment according to claim 3, it is characterised in that：The optical signal receiving circuit also includes
Difference frequency signal amplifying circuit, is arranged between optical signal receiving circuit and phase discriminator, for what is exported to optical signal receiving circuit
Difference frequency signal is amplified process.
5. the method that the type Laser Distance Measuring Equipment described in a kind of employing claim 1 carries out laser ranging, it is characterised in that bag
Include：
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；
The modulated radiating circuit of high-frequency signal produces measuring beam after processing；
Measuring beam is irradiated to testee surface, and the laser signal for then reflecting is received by optical signal receiving circuit, light
Signal receiving circuit accesses local oscillation signal simultaneously, and Jing mixing obtains difference frequency signal；
By difference frequency signal amplifying circuit, further amplification is sent in phase discriminator difference frequency signal；
Reference signal does phase bit comparison and obtains phase difference with difference frequency signal in phase discriminator, and then draws the distance value of testee.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610991374.3A CN106646502B (en) | 2016-11-10 | 2016-11-10 | Laser ranging equipment and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610991374.3A CN106646502B (en) | 2016-11-10 | 2016-11-10 | Laser ranging equipment and method |
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| Publication Number | Publication Date |
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| CN106646502A true CN106646502A (en) | 2017-05-10 |
| CN106646502B CN106646502B (en) | 2023-12-08 |
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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 |
| CN108931782A (en) * | 2018-08-01 | 2018-12-04 | 河南江华工量具有限公司 | A kind of laser ranging system and its distance measuring 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 |
| CN115236685A (en) * | 2022-09-21 | 2022-10-25 | 成都量芯集成科技有限公司 | Phase method laser range unit |
| US11747474B2 (en) | 2019-11-18 | 2023-09-05 | Shenzhen Mileseey Technology Co., Ltd. | Systems and methods for laser distance measurement |
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Cited By (8)
| 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 |
| CN108828615B (en) * | 2018-06-11 | 2024-07-26 | 深圳市镭神智能系统有限公司 | Light emitting unit, optical system, and laser radar system |
| CN108931782A (en) * | 2018-08-01 | 2018-12-04 | 河南江华工量具有限公司 | A kind of laser ranging system and its distance measuring 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 |
| CN115236685A (en) * | 2022-09-21 | 2022-10-25 | 成都量芯集成科技有限公司 | Phase method laser range unit |
| CN115236685B (en) * | 2022-09-21 | 2022-12-23 | 成都量芯集成科技有限公司 | Phase method laser range unit |
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