CN207611145U - A kind of laser ranging system - Google Patents
A kind of laser ranging system Download PDFInfo
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- CN207611145U CN207611145U CN201721689951.XU CN201721689951U CN207611145U CN 207611145 U CN207611145 U CN 207611145U CN 201721689951 U CN201721689951 U CN 201721689951U CN 207611145 U CN207611145 U CN 207611145U
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Abstract
The utility model provides a kind of laser ranging system, including：Clock chip, output local oscillation signal, first lead shake signal and sampling trigger signal；Laser emitter is connect with clock chip, is received described first and is led the signal that shakes, and first laser beam is sent out under the modulation that first leads the signal that shakes to object, the object reflection carrys out second laser beam；Laser pickoff is set on second laser beam path, is received second laser beam and is generated second and leads the signal that shakes；Mixer device is connect with the clock chip and laser pickoff, is received and is mixed local oscillation signal and second and lead the signal that shakes, generates intermediate-freuqncy signal；Microprocessor is connected with the clock chip and mixer device, and receiving intermediate frequency signal and sampling trigger signal simultaneously calculate phase difference, according to phase difference, calculate the distance between laser emitter and object.Existing laser ranging scheme is simplified using the control of clock chip using above-mentioned technical proposal, manufacturing cost is saved, carries high-yield stability.
Description
Technical field
The utility model relates to laser ranging field more particularly to a kind of laser ranging system.
Background technology
Laser range finder is widely used and is built in remote control, accurate measurement, engineering as contactless measuring instrument
If, fields, the feature that phase laser distance measurement instrument is high with its precision, power little He is convenient such as safety monitoring and intelligent control fit
For civilian scope, there are larger market and application prospect.Ranging phase method passes through institute after measurement modulated light wave air-borne transmission
The phase shift of generation, to acquire the distance that light wave is passed by.
Traditional phase laser distance meter generally uses single-emission and double-receiving or double bills to receive pattern, wherein single-emission and double-receiving pattern
In, laser emitter generates photoelectricity mixing on the mixer device of interior light path and outer light path by electrical modulation signal, is produced in interior light path
Raw mixed frequency signal, which can be used as, refers to signal S1, is reflected to after the laser beam arrival measurement target of laser transmitter projects outer
On the mixer device of light path, photoelectricity mixing is generated, signal S2, reference signal S1 and photoelectricity mixed frequency signal S2 frequency phases are mixed out
Together, phase is different, the time representated by phase difference, that is, the flight time, calculates measurement distance accordingly.
In double bill receipts patterns, two laser emitters, respectively first laser transmitter and second laser transmitting are needed
Device, first laser transmitter and mixer device form interior light path, and the laser beam that first laser transmitter is sent out is on mixer device
Photoelectricity mixing is generated by electrical modulation signal, S1 is generated and forms outer light as phase reference, second laser transmitter and mixer device
Road, laser beam that second laser transmitter is sent out reaches measure target after be reflected on mixer device and be mixed with modulated signal,
Generate signal S2；Signal S1 is identical with the frequency of signal S2, and phase is different, this two-way analog signal of processor sampling S1, S2, meter
Phase difference is calculated to obtain the flight time, calculating measurement distance accordingly.
Both the above method is required for inside and outside two light paths, so there are structure, circuit are complicated, it is of high cost the problems such as.For this purpose,
The utility model provides a kind of laser ranging system, and so more structure, circuit are realized more by the control of clock chip
Add simple and reliable distance measuring method, while simplifying manufacturing process and reducing cost, ensures when sampling the continuous multicycle, each
The starting point in period is all same phase point.
Utility model content
In order to overcome above-mentioned technological deficiency, the purpose of this utility model is to provide a kind of laser ranging system, when passing through
The control of clock chip realizes in this way that more structure, circuit be simpler and reliable distance measuring method, while simplifying manufacturing process
And cost is reduced, ensure when sampling the continuous multicycle, the starting point in each period is same phase point.
The utility model discloses a kind of laser ranging system, including microprocessor, clock chip, mixer device, laser
Transmitter and laser pickoff:The clock chip output local oscillation signal, first lead shake signal and sampling trigger signal；It is described to swash
Optical transmitting set is connected with clock chip, and first, which leads the signal that shakes, is transferred to laser emitter, and laser emitter sends out first laser beam,
Under the modulation that first laser beam leads the signal that shakes first, it is sent to object, reflection carrys out second laser beam；The laser pick-off
Device is set on second laser beam path, receives second laser beam, is generated second and is led the signal that shakes；The mixer device, with clock
Chip is connected with the laser pickoff, receives and is mixed local oscillation signal and second and lead the signal that shakes, generates intermediate-freuqncy signal；
Preferably, the microprocessor, is connected with clock chip and mixer device, receiving intermediate frequency signal and sampling triggering letter
Number and calculate phase difference the distance between laser emitter and object calculated according to phase difference.
Preferably, the local oscillation signal of clock chip output, the first master shake the initial phase of signal and sampling trigger signal
Position is identical.
Preferably, second master signal that shakes is to shake to increase phase delay on the basis of signal with the first master.
Preferably, the frequency of the sampling trigger signal is the integral multiple of the frequency of intermediate-freuqncy signal.
Preferably, the angle of the initial phase is all 0 °.
Preferably, the start-phase of the sampling trigger signal is the initial phase of intermediate-freuqncy signal, and wherein initial phase is identical
Refer to local oscillation signal, the first master shakes, and signal and the sampling trigger signal phase when just being exported are identical, and start-phase refers to intermediate frequency
Signal has a phase-shifted, but intermediate-freuqncy signal it is initial phase it is identical as sampling trigger signal.
After using above-mentioned technical proposal, compared with prior art, have the advantages that：
1. range measurement principle is fairly simple, circuit structure is simple and reliable；
2. simplifying manufacturing process, manufacturing cost is reduced；
3. ensureing when sampling the continuous multicycle, the starting point in each period is same phase point.
Description of the drawings
Fig. 1 is the structural schematic diagram for meeting laser ranging system in one preferred embodiment of the utility model.
Reference numeral：
1- clock chips；2- first leads the signal that shakes；3- local oscillation signals；4- sampling trigger signals；5- laser emitters；6-
One laser beam；7- second laser beams；8- laser pickoffs；9- second leads the signal that shakes；10- mixer devices；11- intermediate-freuqncy signals；12-
Microprocessor.
Specific implementation mode
The advantages of the utility model is expanded on further below in conjunction with attached drawing and specific embodiment.
Refering to fig. 1, in the utility model, laser ranging system comprises the following modules：
Clock chip
As the nucleus module of laser ranging system, for controlling entire laser ranging system, the first master is exported respectively and is shaken
Signal, local oscillation signal and sampling trigger signal.First master shakes signal for generating photoelectricity mixed frequency signal, and local oscillation signal is for generating
Intermediate-freuqncy signal, sampling trigger signal are used to go out phase difference with intermediate-freuqncy signal contrast conting, calculate the length of tested distance accordingly.
It is preferred that or optionally, the initial phase that sampling trigger signal, local oscillation signal and first lead the signal three that shakes is identical,
It is 0 °.Since the principle of ranging is to calculate the length of tested distance according to the light velocity and laser time of flight, wherein the light velocity is
Know constant, therefore calculates the flight time.To calculate the flight time, the phase for calculating sampling trigger signal and intermediate-freuqncy signal is needed
Potential difference can only carry out the calculating of phase difference, work as initial phase over one period because the period of intermediate-freuqncy signal is unable to measure
When position is 0 °, measurable distance can be promoted.Clock chip can receive the enabled instruction exported by physical switch or by outside
The enabled instruction of program output.
Laser emitter
It is connected with clock chip, receives first exported from clock chip and lead the signal that shakes, the signal that shakes is led described first
Under modulation, laser emitter sends out first laser beam to measured target object, and a second laser beam is reflected back by measured target object.
It is preferred that or optionally, laser diode can be used in laser emitter.Laser diode have it is efficient, small,
It is simple in structure and the advantages of can directly modulate, using simplified circuit structure, reduction system body in the present invention, can be played
Long-pending use, the objective for simplifying circuit structure with the utility model are consistent.
Laser pickoff
Laser pickoff is set on the path for the second laser beam being reflected back by measured target object, is received second and is swashed
Light beam generates the second master by second laser beam and shakes signal, and the second master signal that shakes is to shake to increase on the basis of signal with the first master
With relevant phase delay at a distance from measured target object, phase delay carries the information of laser beam flight time, can be used for calculating
The length of tested distance.
It is preferred that or optionally, avalanche photodide can be used in photodiode.Avalanche photodide application photoelectricity carries
It flows the sub impact ionization in diode depletion layer and obtains current avalanche multiplication.It, can be with using in the present invention
Strengthen the second intensity for leading the signal that shakes so that final measurement result is more accurate.In addition avalanche photodide also has body
Small, the sensitive and quick advantage of product can play simplified circuit using in the present invention, reduce the use of volume, with this
The objective of the simplification circuit structure of utility model is consistent.
Mixer device
Mixer device is connected with the clock chip and laser pickoff, receives and is shaken by the second master that laser pickoff generates
Signal and the local oscillation signal exported by clock chip, mixing generate intermediate-freuqncy signal.
It is preferred that or optionally, wherein clock chip output sampling trigger signal be intermediate-freuqncy signal frequency integral multiple,
The start-phase of sampling trigger signal and the initial phase angle of intermediate-freuqncy signal are ensured that in this way.Wherein, the multiple of frequency can root
It is adjusted according to actual conditions.
It is preferred that or optionally, common frequency mixer can be used in mixer device.The best effort frequency range of system is in local concussion
Attachment, i.e., near the frequency of local oscillation signal, frequency mixer can be transferred to the second information for shaking entrained by signal of master desired
In frequency range.Using in the present invention can be with the accuracy of lifting system measurement result.
Microprocessor
Microprocessor is connected with clock chip and mixer device, receives the sampling trigger signal generated by clock chip and mixes
The intermediate-freuqncy signal that frequency device generates, calculates phase difference between the two, and the reality of laser beam flight is calculated according to phasometer
Time, to obtain the distance between laser emitter and measured target object, i.e., the required distance length measured.
Specific implementation mode is that the clock chip receives enabled instruction, exports first respectively and leads shake signal, local oscillation signal
And sampling trigger signal, wherein the first master shakes, signal is transferred to the laser emitter being connected with clock chip；Local oscillation signal transmits
To mixer device；Sampling trigger signal is transferred to microprocessor.Laser emitter receives first and leads the signal that shakes, and the letter that shakes is led first
Number modulation under, laser emitter sends out first laser beam to measured target object, and a second laser is reflected back by measured target object
Beam, second laser beam are arranged on the reception of the laser pickoff on its path, and laser pickoff produces after receiving second laser beam
Raw electric signal signal that is, the second master shakes, and lead the signal that shakes by second and be transferred in the mixer device being connected with laser pickoff.It is mixed
Frequency device receives the local oscillation signal from clock chip and second from laser pickoff leads the signal that shakes, and mixing generates a reference
Signal, i.e. intermediate-freuqncy signal.Microprocessor is connected with clock chip and mixer device respectively, and intermediate-freuqncy signal and sampling trigger signal pass
It is handed to microprocessor, microprocessor calculates the phase difference of intermediate-freuqncy signal and sampling trigger signal, calculates laser beam accordingly and flies
The row time obtains the length of tested distance.
Based on embodiment above-mentioned and embodiment, the utility model provides a kind of single-shot list controlled with clock chip
The laser ranging system of receipts calculates target range length using the phasometer of signal.
It should be noted that the embodiments of the present invention have preferable implementation, and not the utility model is appointed
The limitation of what form, any one skilled in the art change or are modified to possibly also with the technology contents of the disclosure above
Same effective embodiment, as long as without departing from the content of technical solutions of the utility model, according to the technical essence of the utility model pair
Any modification or equivalent variations and modification, are still within the scope of the technical solutions of the present invention made by above example.
Claims (6)
1. a kind of laser ranging system, which is characterized in that including microprocessor, clock chip, mixer device, laser emitter and
Laser pickoff；
The clock chip output local oscillation signal, first lead shake signal and sampling trigger signal；
The laser emitter is connected with the clock chip, and described first, which leads the signal that shakes, is transferred to the laser emitter, institute
State laser emitter and send out a first laser beam, the first laser beam first master shake signal modulation under, be sent to
Object is reflected back a second laser beam；
The laser pickoff is set on second laser beam path, receives the second laser beam, generates one second master
Shake signal；
The mixer device is connected with the clock chip and the laser pickoff, receive and be mixed the local oscillation signal and
Described second leads the signal that shakes, to generate an intermediate-freuqncy signal；
The microprocessor is connected with the clock chip and the mixer device, receives the intermediate-freuqncy signal and the sampling
Trigger signal simultaneously calculates phase difference, according to the phase difference, calculates between the laser emitter and the object
Distance.
2. laser ranging system according to claim 1, which is characterized in that the local oscillator letter of the clock chip output
Number, the first master signal that shakes it is identical with the initial phase of the sampling trigger signal.
3. laser ranging system according to claim 1, which is characterized in that the second master signal that shakes is with described first
Phase delay is increased on the basis of the main signal that shakes.
4. laser ranging system according to claim 1, which is characterized in that the frequency of the sampling trigger signal is described
The integral multiple of the frequency of intermediate-freuqncy signal.
5. laser ranging system according to claim 2, which is characterized in that the angle of the initial phase is all 0 °.
6. laser ranging system according to claim 4, which is characterized in that the start-phase of the sampling trigger signal is
The initial phase of the intermediate-freuqncy signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721689951.XU CN207611145U (en) | 2017-12-07 | 2017-12-07 | A kind of laser ranging system |
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| CN201721689951.XU CN207611145U (en) | 2017-12-07 | 2017-12-07 | A kind of laser ranging system |
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| CN207611145U true CN207611145U (en) | 2018-07-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196262A (en) * | 2017-12-07 | 2018-06-22 | 常州华达科捷光电仪器有限公司 | A kind of laser ranging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196262A (en) * | 2017-12-07 | 2018-06-22 | 常州华达科捷光电仪器有限公司 | A kind of laser ranging system |
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