CN208999565U - A kind of scanning means and laser radar - Google Patents
A kind of scanning means and laser radar Download PDFInfo
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- CN208999565U CN208999565U CN201821661680.1U CN201821661680U CN208999565U CN 208999565 U CN208999565 U CN 208999565U CN 201821661680 U CN201821661680 U CN 201821661680U CN 208999565 U CN208999565 U CN 208999565U
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Abstract
It includes light source, polarizer, liquid crystal structure and electricity structure that the utility model embodiment, which provides a kind of scanning means and laser radar, scanning means,.Light source emits laser beam to liquid crystal structure；Liquid crystal structure receives laser beam, and pass through the reflective surface laser beam of liquid crystal structure, laser beam after reflection forms hot spot on tested object plane, liquid crystal structure is located in electric field, therefore, when using having the laser radar of the scanning means to be scanned measurement to object plane to be measured, electricity structure presets the voltage formation electric field of rule by applying to liquid crystal structure, since liquid crystal structure has certain mobility, when applying voltage to liquid crystal structure, corresponding deflection can occur for liquid crystal structure interior molecules, change the refractive index of liquid crystal structure reflecting surface, to change exit direction of the laser beam after reflecting surface, and then change position of the hot spot on tested object plane, realize the scanning to tested object plane.The device precision is higher, has measurement reproducibility, control flexibility and stability.
Description
Technical field
The utility model relates to optical technical fields, and in particular to a kind of scanning means and laser radar.
Background technique
Laser radar is the radar system to emit the characteristic quantities such as the position of detecting laser beam target, speed, extensive
It is applied to various fields.Laser radar can be divided into scan-type and non-scanning type two major classes, for scanning type laser radar,
Scanning type laser radar changes the direction of propagation of laser by Scan Architecture, to allow laser in the different positions of tested object plane
It sets and sequentially forms hot spot, to complete the scanning to object plane to be measured, during the scanning process, be tested the reflected light on object plane by laser
The detector of radar receives and then completes the scanning survey to tested object plane.
Scan Architecture used in traditional laser radar is mainly mechanical rotation scan structure, i.e., is rotated by motor
Drive optical texture (such as lens, prism etc.) or transmitting light source itself rotate, and the rotation of optical texture can change through
The direction of propagation of the laser of the reflective surface of optical texture is crossed, to realize the scanning to object plane to be measured.
But mechanical rotation scan structure carries out mechanical rotation with continuous for a long time, makes due to there is mechanical rotation
It obtains mechanical rotation scan structure constantly to wear, so as to shorten the service life of mechanical rotation scan structure, and with the production of abrasion
It is raw, it can also reduce the precision and stability of mechanical rotation scan structure.
Utility model content
In view of this, the utility model embodiment provides a kind of scanning means and laser radar, without mechanical rotation, do not deposit
In mechanical wear, so that precision is higher, there is measurement reproducibility, control flexibility and stability.
To achieve the above object, the utility model embodiment provides the following technical solutions:
In a first aspect, the utility model embodiment provides a kind of scanning means, described device is applied to laser radar, described
Device includes light source, liquid crystal structure and electricity structure:
The light source, for emitting laser beam to the liquid crystal structure；
The liquid crystal structure, for receiving laser beam, and laser beam described in the reflective surface for passing through the liquid crystal structure,
Laser beam after reflection forms hot spot on tested object plane, and the liquid crystal structure is located in the electric field of electricity structure formation,
The electricity structure forms the electric field by the voltage for applying default rule to the liquid crystal structure, is applied in described device
When laser radar is scanned measurement to object plane to be measured, the refractive index of the liquid crystal structure changes under the action of the electric field
Become, to change position of the hot spot on the tested object plane, the collection of position of the hot spot on the tested object plane
Cooperation is scanning area of the laser radar on the tested object plane.
In one implementation, the default rule is embodied by voltage and the corresponding relationship at moment, is surveyed for scanning
Any time during amount, the laser beam after applying the reflection that voltage obtains to the liquid crystal structure is relative to no applied voltage
The first deflection angle of laser beam deflection after obtained reflection, described device further include amplification optical texture:
The amplification optical texture expands first deflection angle for receiving the laser beam after the reflection.
In one implementation, described device further includes collimator and extender structure:
The collimator and extender structure, in the laser beam that the light source emits by before the liquid crystal structure, to institute
It states laser beam to be expanded, so that the size of tested object plane glazing spot meets preset condition.
In one implementation, the light source includes at least one laser.
In one implementation, if the light source includes multiple lasers, the multiple laser is according to predetermined order
Successively issue laser beam.
In one implementation, the liquid crystal structure is LCD space light modulator.
In one implementation, if the light source includes multiple lasers, the multiple laser is simultaneously emitted by laser
Beam, the LCD space light modulator are also used to couple the laser beam that the multiple laser is simultaneously emitted by.
In one implementation, described device further includes polarizer:
The laser beam of the light source transmitting obtains light beam by the polarizer, then the liquid crystal structure receives
Laser beam is light beam.
Second aspect, the utility model embodiment provide a kind of laser radar, and the laser radar includes in first aspect
Described in any item scanning means, further includes: transmitting optical texture receives optical texture and detector；
The transmitting optical texture, for receiving the laser beam of scanning means outgoing, and by the laser beam transmission
Onto tested object plane；
The reception optical texture, for receiving the laser beam of the tested object plane reflection, and by the laser beam
It is transmitted on the detector, is imaged on the detector.
In one implementation, if the hot spot that the scanning means is formed on the tested object plane meets default item
Part, then the detector is planar array detector.
In one implementation, the planar array detector is surface array charge-coupled element.
Based on the above-mentioned technical proposal, it can be seen that the utility model embodiment has the advantage that
Scanning means provided by the embodiment of the utility model can be applied to laser radar, and described device includes light source, liquid
Crystal structure and electricity structure.Wherein, the light source emits laser beam to the liquid crystal structure；The liquid crystal structure receives described sharp
Light beam, and laser beam described in the reflective surface for passing through the liquid crystal structure, the laser beam after reflection are formed on tested object plane
Hot spot, the liquid crystal structure are located in electric field, and the electricity structure presets the voltage of rule by applying to the liquid crystal structure
The electric field is formed, in this way, when using having the laser radar of the scanning means to be scanned measurement to object plane to be measured, due to
Liquid crystal structure has certain mobility, and when applying voltage to liquid crystal structure, liquid crystal structure interior molecules can occur corresponding inclined
Turn, changes the refractive index of liquid crystal structure reflecting surface, to change exit direction of the laser beam after the reflecting surface, Jin Ergai
Become position of the hot spot on the tested object plane, realizes the scanning to tested object plane.Compared with conventional scanner, this is swept
Mechanical wear is not present without mechanical rotation in imaging apparatus, so that precision is higher, have measurement reproducibility, control flexibility and
Stability.
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
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is that the variations in refractive index that liquid crystal structure birefringence effect provided by the embodiment of the utility model causes and light beam are inclined
The schematic diagram turned；
Fig. 2 is the variation schematic diagram of liquid crystal structure provided by the embodiment of the utility model off the field；
Fig. 3 is the schematic diagram that liquid crystal structure provided by the embodiment of the utility model changes laser beam exits direction；
Fig. 4 is the schematic diagram that Wave-front phase provided by the embodiment of the utility model variation changes laser beam exits direction；
Fig. 5 a is a kind of structure chart of scanning means provided by the embodiment of the utility model；
Fig. 5 b is a kind of structure chart of scanning means provided by the embodiment of the utility model；
Fig. 6 is a kind of structure chart of scanning means provided by the embodiment of the utility model；
Fig. 7 is a kind of structure chart of scanning means provided by the embodiment of the utility model；
Fig. 8 a is that a kind of scanning means provided by the embodiment of the utility model forms showing for scanning area on tested object plane
It is intended to；
Fig. 8 b is that a kind of scanning means provided by the embodiment of the utility model forms showing for scanning area on tested object plane
It is intended to；
Fig. 8 c is that a kind of scanning means provided by the embodiment of the utility model forms showing for scanning area on tested object plane
It is intended to；
Fig. 9 is the schematic diagram that situation is scanned in scanning area provided by the embodiment of the utility model；
Figure 10 is a kind of structure chart of laser radar provided by the embodiment of the utility model.
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.
Scan Architecture used in traditional laser radar is mainly mechanical rotation scan structure, this Scan Architecture by
In there is mechanical rotation, mechanical rotation is carried out with continuous for a long time, so that mechanical rotation scan structure is constantly worn, from
And shorten the service life of mechanical rotation scan structure, and with the generation of abrasion, it can also reduce the essence of mechanical rotation scan structure
Degree and stability.
For this purpose, the utility model embodiment provides a kind of scanning means, which has using liquid crystal structure itself
Mobility, i.e., when applying voltage to liquid crystal structure, liquid crystal structure interior molecules can be occurred corresponding inclined by the effect of voltage
Turn, and then changes the refractive index of liquid crystal structure reflecting surface.And after variations in refractive index, by liquid crystal structure reflective surface swash
The direction of propagation of light beam will change, and the facula position formed on tested object plane can also change, these hot spot positions
Set the scanning area for constituting tested object plane.In this way, can be realized by controlling the voltage being applied on liquid crystal structure
It is scanned to tested object plane.
The variations in refractive index of liquid crystal structure birefringence effect initiation is shown referring to Fig. 1, Fig. 1 and light beam deflects, wherein with
For a liquid crystal molecule in liquid crystal structure, when the figure on the left of Fig. 1 can indicate no applied voltage, polarization direction is parallel to paper
For the laser beam in face at the surface of liquid crystal molecule, laser beam passes through the refraction situation of liquid crystal molecule；Figure on the right side of Fig. 1 indicates to apply
When voltage, the pointing vector of liquid crystal molecule deflects, and pointing vector, that is, elliptical long axis direction becomes its refractive index
Change, in this way, polarization direction is parallel to the laser beam of paper at the surface of liquid crystal molecule, it can be because of the change of crystal molecule refractive index
Change, so that corresponding change occurs for the direction of incident light and phase.Fig. 1 is only an example, and the utility model embodiment is not
The polarization direction of laser beam is limited.
Referring to fig. 2, the variation schematic diagram Fig. 2 shows liquid crystal structure off the field, wherein liquid crystal structure 201 is located at electric field
In, the electric field is formed by upper bottom crown 202, power supply 203 and switch 204 formation of liquid crystal structure when switch 204 is closed
Electric field generates regular row in the liquid crystal molecule such as Fig. 2 inside liquid crystal structure 201 so that liquid crystal structure 201 is located in electric field
Cloth, as shown in the figure on right side in Fig. 2, the voltage for changing power supply 203 can change the voltage for being applied to bottom crown 202, in turn
Change electric field level, the change meeting of electric field level is so that the arrangement of liquid crystal molecule happens variation, to change liquid crystal structure
201 refractive index；When what the figure on the left of Fig. 1 indicated is switch 204 not closed (no applied voltage), 201 inside liquid of liquid crystal structure
The arrangement situation of brilliant molecule.
The principle for changing laser beam exits direction to liquid crystal structure below in conjunction with reflected light path figure is introduced, referring to figure
3, Fig. 3 show the schematic diagram that liquid crystal structure changes laser beam exits direction.Wherein, laser beam A is incident on the anti-of liquid crystal structure
It penetrates on face, it will reflect, when switching not closed, the laser beam that laser beam A is obtained after reflective surface is A '；When
When closing the switch, the refractive index of liquid crystal structure changes, and according to principle of reflection and diffraction effect, laser beam A passes through reflecting surface
The laser beam obtained after reflection is A ".
The principle for changing laser beam exits direction to liquid crystal structure from Wave-front phase angle changing is introduced below, is joined
See that Fig. 4, Fig. 4 show the schematic diagram that Wave-front phase variation changes laser beam exits direction.Wherein, when not applying electric field, swash
The wavefront of the former direction of propagation in light beam edge is as shown in 401, and after applying electric field, the wavefront for the laser beam for causing it to reflect obtains difference
Phase compensation term.From principle of diffraction optics it is found that introducing wedge-shaped phase (within 2 π periods) such as to the wavefront of collimated laser beam
Shown in 402, then laser beam can be made to obtain the deflection of wedge shape corresponding direction, introduce after the wedge shape phase 402 wavefront of laser beam with
It the direction of propagation can be as shown by 403.
The principle of the above-mentioned direction of propagation that can change laser beam under the action of electric field to liquid crystal structure is introduced, and connects
Get off, will be introduced in conjunction with scanning means of the attached drawing to application principle design.
Referring to Fig. 5 a, Fig. 5 a shows a kind of scanning means, and described device is applied to laser radar, and described device includes light
Source 501, liquid crystal structure 502 and electricity structure 503:
The light source 501, for emitting laser beam to the liquid crystal structure 502；
The liquid crystal structure 502 for receiving the laser beam, and passes through the reflective surface of the liquid crystal structure 502
The laser beam, the laser beam after reflection form hot spot on tested object plane, and the liquid crystal structure 502 is located in the electric field,
The electricity structure 503 forms the electric field by the voltage for applying default rule to the liquid crystal structure 502, in described device
When being scanned measurement to object plane to be measured applied to laser radar, the work of the refractive index of the liquid crystal structure 502 in the electric field
It changes under, to change position of the hot spot on the tested object plane, the hot spot is on the tested object plane
Position scanning area of the set as the laser radar on the tested object plane.Wherein, hot spot can have different
Size, when the size of hot spot is less than certain threshold value, it is believed that hot spot is actually a luminous point.
It can be seen from Fig. 5a that in no applied voltage, laser beam A after the reflective surface of liquid crystal structure 502,
Laser beam A1 is obtained, laser beam A1 is located at position B1 in the hot spot that tested object plane is formed；When applying a certain size voltage, liquid
Refractive index under the action of electric field of crystal structure 502 changes, and laser beam A is obtained after the reflective surface of liquid crystal structure 502
It is located at position B2 in the hot spot that tested object plane is formed to laser beam A2, laser beam A2；When changing the size of the voltage applied, instead
The polarization optical propagation direction penetrated can also change, for example, laser beam A3 is obtained, the hot spot that laser beam A3 is formed in tested object plane
Positioned at position B3, the region on tested object plane between B2-B3 may be considered scanning area.
In one implementation, the laser beam for being incident on the liquid crystal structure 502 can be with a certain polarization direction
Light beam, therefore, referring to Fig. 5 b, the apparatus may include polarizers 504:
The laser beam that the light source 501 emits obtains light beam by the polarizer 504, then the liquid crystal structure
502 laser beams received are light beam.
It should be noted that voltage needs constantly to change size, different moments could be made through the reflection of liquid crystal structure 502
The direction of propagation of laser beam after the reflection of face is different, is just able to achieve the scanning to tested object plane different location, therefore, described default
Rule is embodied by voltage and the corresponding relationship at moment.
Wherein, for any time during scanning survey, after applying the reflection that voltage obtains to the liquid crystal structure
The reflection that is obtained relative to no applied voltage of laser beam after the first deflection angle of laser beam deflection, for example, laser beam A2 in Fig. 5
Certain angle is deflected relative to laser beam A1, which can be used as the first deflection angle, and the first deflection angle is bigger, in measured object
The scanning area formed on face is bigger, i.e., the range that can be measured on tested object plane is bigger, therefore, in order to obtain bigger sweep
Range is retouched, described device further includes amplification optical texture 505:
The amplification optical texture 505 expands first deflection angle for receiving the laser beam after the reflection.Its
In, the amplification optical texture 505 can be lens.It is shown in Figure 6, originally reflect after laser beam be laser beam A1 and
A2, region of the corresponding scanning area between B1-B2, the laser beam warp due to amplifying the presence of optical texture 505, after reflection
It is reflected after crossing the amplification optical texture 505, so that the laser beam A1 of script becomes laser beam A3, the laser beam A2 of script
Become laser beam A4, corresponding scanning area becomes the region between B3-B4, as can be seen from the figure the region between B3-B4
Greater than the region between B1-B2, therefore, scanning area can be expanded by amplifying optical texture 505, so that laser radar can be with
Realize the scanning survey of wide-angle.
In some implementations, it in order to accelerate scanning speed, realizes and entire tested object plane is measured faster, also
It can guarantee that the hot spot formed on tested object plane meets preset condition, the preset condition may be greater than certain threshold value, example
Such as, it may be greater than first threshold, to realize that planar scans.
For this purpose, described device further includes collimator and extender structure 506, the collimator and extender structure 506, in the light source
The laser beam of 501 transmittings is by expanding the laser beam before the polarizer 502, so that tested object plane glazing spot
Size meet preset condition, the scanning means including collimator and extender structure 506 may refer to shown in Fig. 7, wherein tested object plane
The hot spot of upper formation is as shown in the region between B1-B2.
It should be noted that in the present embodiment, the light source includes at least one laser, that is to say, that light source can
To include a laser, two lasers, even more lasers, relative to using a laser as light source and
Speech, uses multiple lasers that can expand scanning area as light source.
By taking light source 501 includes two lasers as an example, referring to Fig. 8 a, the scanning means in Fig. 8 a illustrates only light source 501
With liquid crystal structure 502, in order to distinguish, wherein a laser transmitting laser beam can be used as laser beam A, another laser
The laser beam of device transmitting can be used as laser beam B, and the corresponding scanning area of laser beam A is A sweep region, and laser beam B is corresponding
Scanning area is B-scan region, then the scanning area for being tested object plane is the sum of A sweep region and B-scan region, it is seen that uses two
A laser, which is greater than the scanning area that tested object plane is scanned, sweeps tested object plane using only a laser
The scanning area retouched.
Certainly, when light source 501 includes two lasers, the position of light source 501 is not limited only to Fig. 8 a, referring also to Fig. 8 b
Deng other installation sites, the present embodiment is not limited this.The laser beam B in laser beam C and Fig. 8 a in Fig. 8 b is symmetrical, Fig. 8 b
In laser beam D and Fig. 8 a in laser beam A it is symmetrical.
According to Fig. 8 a and Fig. 8 b, in multiple lasers that light source 501 may include, multiple lasers can be symmetrical two-by-two,
That is laser beam C and laser beam B are symmetrical, and laser beam D and laser beam A are symmetrical, so that the total scanning formed on tested object plane
Region is the sum of corresponding scanning area of four lasers, referring to shown in Fig. 8 c, wherein laser beam C and laser beam D are not
It shows.
If the hot spot that laser beam is formed on tested object plane is the narrow line of bar shaped, at this point, each laser beam is in tested object plane
The scanning situation of scanning area is shown in Figure 9, i.e., the narrow line of strip that each laser beam is formed on tested object plane is corresponding
Scanning area is constantly moved towards a direction and (is moved from right to left in Fig. 9, as scanning direction), to complete to measured object
The scanning of face respective scan area.
When light source includes multiple lasers, scanning mode may include two kinds, wherein a kind of scanning mode can be, institute
It states multiple lasers and successively issues laser beam according to predetermined order, i.e., scan flow is taken turns in multiple laser subregions, by taking Fig. 8 a as an example,
That is it after laser beam A is completed to the scanning in the A sweep region on tested object plane, then is continued to complete on tested object plane by laser beam B
B-scan region scanning.
However, in some cases, since luminous energy is limited due to various limiting factors for single laser, and it is each sharp
The completion of light device requires the regular hour to the scanning of corresponding scanning area, so, in order to enhance laser beam in scanning process
Energy, improve scan efficiency, it is therefore possible to use the scanning side that multiple lasers are simultaneously emitted by laser beam while being scanned
Formula.In order to realize the laser beam of the multiple lasers sendings of coupling while be scanned, the liquid crystal structure 502 can be liquid crystal sky
Between optical modulator (Liquid Crystal-Spatial Light Modulator, abbreviation LC-SLM), using described in LC-SLM
The laser beam that multiple lasers are simultaneously emitted by is coupled.
By taking Fig. 8 c as an example, laser beam A, laser beam B, laser beam C and laser beam D are simultaneously emitted by laser beam, while to respective
Corresponding scanning area is scanned, and improves scan frequency.
Scanning means provided by the embodiment of the utility model can be applied to laser radar, and described device includes light source, liquid
Crystal structure and electricity structure.Wherein, the light source emits laser beam to the liquid crystal structure；The liquid crystal structure receives described sharp
Light beam, and laser beam described in the reflective surface for passing through the liquid crystal structure, the laser beam after reflection are formed on tested object plane
Hot spot, the liquid crystal structure are located in electric field, and the electricity structure presets the voltage of rule by applying to the liquid crystal structure
The electric field is formed, in this way, when using having the laser radar of the scanning means to be scanned measurement to object plane to be measured, due to
Liquid crystal structure has certain mobility, and when applying voltage to liquid crystal structure, liquid crystal structure interior molecules can occur corresponding inclined
Turn, changes the refractive index of liquid crystal structure reflecting surface, to change exit direction of the laser beam after the reflecting surface, Jin Ergai
Become position of the hot spot on the tested object plane, realizes the scanning to tested object plane.It is mechanical compared with conventional scanner
The Installation And Calibration required precision of rotational structure is high, and the follow-up maintenance school in order to guarantee its measurement accuracy and repeatability needs
Quasi- cost is also high, and the device then can have measurement reproducibility to avoid such case；The scanning means turns without mechanical
It is dynamic, mechanical wear and dislocation is not present, so that precision and stability is higher；In addition, the device, which need to only change, is applied to liquid crystal knot
Voltage on structure, so that it may realize to any size and shape for changing, capable of also changing hot spot of outgoing light direction, have very high
Controllability.
Based on the scanning means that previous embodiment provides, the utility model embodiment additionally provides a kind of laser radar, joins
See that Figure 10, the laser radar include the scanning means 1001 realized based on aforementioned any embodiment, further includes: transmitting optics knot
Structure 1002 receives optical texture 1003 and detector 1004；
In Figure 10, the scanning means 1001 is a kind of implementation provided in above-described embodiment, is only scanning dress
A kind of example for setting 1001, is not intended as the restriction to 1001 structure of scanning means.
The transmitting optical texture 1002, for receiving the laser beam of scanning means outgoing, and by the laser beam
It is transmitted on tested object plane；
The reception optical texture 1003 for receiving the laser beam of the tested object plane reflection, and swashs described
Light beam is transmitted on the detector 1004, is imaged on the detector 1004.
It, can be with it should be noted that realize and measured faster to the entire object plane that is tested to accelerate scanning speed
The hot spot for guaranteeing that the scanning means is formed on tested object plane meets preset condition, and the preset condition may be greater than centainly
Threshold value, for example, it may be being greater than first threshold, to realize that planar scans, correspondingly, for receiving swashing for tested object plane reflection
Light beam and the detector being imaged should be planar array detector.
It should be noted that when being scanned measurement to tested object plane using laser radar, if the hot spot on tested object plane
For the narrow line of strip, then in a scanning direction the resolving power of scanning survey by the width and scanning angle precision of the narrow line of strip and face battle array
Detector determines, and the scanning survey resolving power on the direction vertical with scanning direction needs to determine by planar array detector.
In order to guarantee the series of advantages such as the small in size, light-weight of laser radar, small power consumption, service life length, reliability height, institute
Stating planar array detector can be surface array charge-coupled element (Charge-coupled Device, abbreviation CCD).
It can be seen from the above technical proposal that applying the laser thunder for the scanning means that Fig. 1 is provided to Fig. 9 any embodiment
It reaches, since its scanning means includes light source, liquid crystal structure and electricity structure, the liquid crystal structure is located in electric field, the electricity
Structure forms the electric field by the voltage for applying default rule to the liquid crystal structure, in this way, having scanning dress when utilizing
When the laser radar set is scanned measurement to object plane to be measured, since liquid crystal structure has certain mobility, to liquid crystal knot
When structure applies voltage, corresponding deflection can occur for liquid crystal structure interior molecules, change the refractive index of liquid crystal structure reflecting surface, to change
Become exit direction of the laser beam after the reflecting surface, and then changes position of the hot spot on the tested object plane, it is real
Now to the scanning of tested object plane.Compared with conventional laser radar, mechanical structure is not present in the laser radar, pacifies without high-precision
Dress and calibration have measurement reproducibility, and mechanical movement are not present, and belong to solid-state laser radar, and thus, there is no machinery to grind
Damage and dislocation, precision and stability are higher；In addition, the laser radar need to only change the voltage being applied on liquid crystal structure, so that it may
To realize to any size and shape for changing, capable of also changing hot spot of outgoing light direction, there is very high controllability.
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.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be real in other embodiments in the case where not departing from the core concept or range of the utility model
It is existing.Therefore, the present invention will not be limited to the embodiments shown herein, and be to fit to it is disclosed herein
Principle and the consistent widest scope of features of novelty.
Claims (11)
1. a kind of scanning means, which is characterized in that described device is applied to laser radar, and described device includes light source, liquid crystal knot
Structure and electricity structure:
The light source, for emitting laser beam to the liquid crystal structure；
The liquid crystal structure, for receiving laser beam, and laser beam described in the reflective surface for passing through the liquid crystal structure, reflection
Laser beam afterwards forms hot spot on tested object plane, and the liquid crystal structure is located in the electric field of electricity structure formation, described
Electricity structure forms the electric field by the voltage for applying default rule to the liquid crystal structure, is applied to laser in described device
When radar is scanned measurement to object plane to be measured, the refractive index of the liquid crystal structure changes under the action of the electric field,
To change position of the hot spot on the tested object plane, the collection cooperation of position of the hot spot on the tested object plane
For scanning area of the laser radar on the tested object plane.
2. the apparatus according to claim 1, which is characterized in that the default rule is corresponding with the moment by the voltage
Relationship embodies, for any time during scanning survey, swashing after applying the reflection that voltage obtains to the liquid crystal structure
The first deflection angle of laser beam deflection after the reflection that light beam is obtained relative to no applied voltage, described device further include amplification optics
Structure:
The amplification optical texture expands first deflection angle for receiving the laser beam after the reflection.
3. the apparatus according to claim 1, which is characterized in that described device further includes collimator and extender structure:
The collimator and extender structure, for being swashed before the laser beam that the light source emits is by the liquid crystal structure to described
Light beam is expanded, so that the size of tested object plane glazing spot meets preset condition.
4. the apparatus according to claim 1, which is characterized in that the light source includes at least one laser.
5. device according to claim 4, which is characterized in that the multiple to swash if the light source includes multiple lasers
Light device successively issues laser beam according to predetermined order.
6. the apparatus according to claim 1, which is characterized in that the liquid crystal structure is LCD space light modulator.
7. device according to claim 6, which is characterized in that the multiple to swash if the light source includes multiple lasers
Light device is simultaneously emitted by laser beam, and the LCD space light modulator is also used to the laser beam being simultaneously emitted by the multiple laser
It is coupled.
8. device according to claim 1-7, which is characterized in that described device further includes polarizer:
The laser beam of the light source transmitting obtains light beam by the polarizer, then the laser that the liquid crystal structure receives
Beam is light beam.
9. a kind of laser radar, which is characterized in that the laser radar includes the described in any item scanning dresses of claim 1-8
It sets, further includes: transmitting optical texture receives optical texture and detector；
The transmitting optical texture, for receiving the laser beam of scanning means outgoing, and by the laser beam transmission to quilt
It surveys on object plane；
The reception optical texture, for receiving the laser beam of the tested object plane reflection, and by the laser beam transmission
Onto the detector, it is imaged on the detector.
10. laser radar according to claim 9, which is characterized in that if the scanning means is on the tested object plane
The hot spot of formation meets preset condition, then the detector is planar array detector.
11. laser radar according to claim 10, which is characterized in that the planar array detector is surface array charge-coupled member
Part.
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| CN (1) | CN208999565U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164464A (en) * | 2018-10-12 | 2019-01-08 | 北醒（北京）光子科技有限公司 | A kind of scanning means and laser radar |
| CN112711135A (en) * | 2019-10-24 | 2021-04-27 | 华为技术有限公司 | Scanning dot matrix projection system and electronic equipment |
| WO2021237557A1 (en) * | 2020-05-28 | 2021-12-02 | 华为技术有限公司 | Radar system, photodetector, automobile, and photodetection method |
| CN117890885A (en) * | 2024-03-15 | 2024-04-16 | 之江实验室 | Laser radar scanning mechanism and scanning method thereof |
-
2018
- 2018-10-12 CN CN201821661680.1U patent/CN208999565U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164464A (en) * | 2018-10-12 | 2019-01-08 | 北醒（北京）光子科技有限公司 | A kind of scanning means and laser radar |
| CN112711135A (en) * | 2019-10-24 | 2021-04-27 | 华为技术有限公司 | Scanning dot matrix projection system and electronic equipment |
| WO2021237557A1 (en) * | 2020-05-28 | 2021-12-02 | 华为技术有限公司 | Radar system, photodetector, automobile, and photodetection method |
| CN117890885A (en) * | 2024-03-15 | 2024-04-16 | 之江实验室 | Laser radar scanning mechanism and scanning method thereof |
| CN117890885B (en) * | 2024-03-15 | 2024-06-04 | 之江实验室 | Laser radar scanning mechanism and scanning method thereof |
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