CN110456323A - A kind of light emitting unit, light emitting devices and distance-measuring equipment - Google Patents
A kind of light emitting unit, light emitting devices and distance-measuring equipment Download PDFInfo
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- CN110456323A CN110456323A CN201910614032.3A CN201910614032A CN110456323A CN 110456323 A CN110456323 A CN 110456323A CN 201910614032 A CN201910614032 A CN 201910614032A CN 110456323 A CN110456323 A CN 110456323A
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- Prior art keywords
- light
- light emitting
- polarised
- emitting unit
- reflecting mirror
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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
-
- 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
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
- G01S7/4815—Constructional features, e.g. arrangements of optical elements of transmitters alone using multiple transmitters
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
Abstract
The present invention provides a kind of light emitting unit, light emitting devices and distance-measuring equipments, the light emitting unit includes with lower component: light emission component includes optical axis the first light emitting end disposed in parallel for issuing the first polarised light and the second light emitting end for issuing the second polarised light, and the first polarised light is parallel with the second polarised light exit direction but direction of vibration is vertical；Reflecting mirror is set in the propagation optical path of the first polarised light, and opposite with the first light emitting end position；Polarization spectroscope is set in the propagation optical path of the first polarised light and the second polarised light, and opposite with the second light emitting end position；With brewster angle incidence to polarization spectroscope, the second polarised light after polarization spectroscope reflects is combined into a branch of light combination with the first polarised light completely through polarization spectroscope for first polarised light and the second polarised light.The light source luminescent power of light emitting devices can be improved in technical solution of the present invention, and then improves the detection range of distance-measuring equipment.
Description
Technical field
The invention belongs to optical distance measuring equipment fields more particularly to a kind of light emitting unit, light emitting devices and ranging to set
It is standby.
Background technique
Currently, the ranging technology of common optics distance-measuring equipment generally comprises structure light, TOF (Time Of in the market
Flight, flight time telemetry), laser radar etc., principle then will be received by emitting light beam to body to be measured
From the reflected signal of body to be measured after proper treatment, so that it may the relevant information of object under test is obtained, thus realization pair
Detection, tracking and the identification of object under test.
However, in the detection process of distance-measuring equipment, the luminous power of light source will have a direct impact on the detection of distance-measuring equipment away from
From the detection range of that is, existing distance-measuring equipment is limited to the luminous power of light source, and therefore, designing one kind being capable of equivalent raising light
The scheme of source luminous power is the important link for improving existing distance-measuring equipment detection range.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of light emitting unit is provided, is intended to solve
The light source luminescent power of certainly existing light emitting devices is lower, and then the problem that the detection range of distance-measuring equipment is limited.
The present invention proposes a kind of light emitting unit, including light emission component, reflecting mirror and polarization spectroscope；Light emitting group
Part includes optical axis the first light emitting end disposed in parallel and the second light emitting end, and first light emitting end is for issuing first partially
Shake light, and second light emitting end is for issuing the second polarised light, first polarised light and second polarised light outgoing side
It is vertical to parallel but direction of vibration；Reflecting mirror be set to first polarised light propagation optical path on, and with first light emitting
End position is opposite；Polarization spectroscope is set in the propagation optical path of first polarised light and second polarised light, and with it is described
Second light emitting end position is opposite；The polarization spectroscope is for receiving reflecting through the reflecting mirror and being entered with Brewster's angle
The first polarised light penetrated, and reflection are reflected with second polarised light of brewster angle incidence through the polarization spectroscope
Second polarised light afterwards is combined into a branch of light combination with first polarised light completely through the polarization spectroscope.
Optionally, first light emitting end and second light emitting end include the polarised light to issue polarised light
Source or polarization laser；
The light emitting unit further includes the first collimation lens and the second collimation lens, and first collimation lens is set to institute
Going out on light path for the first light emitting end is stated, to carry out convergence collimation to first polarised light；Second collimation lens
Set on going out on light path for second light emitting end, to carry out convergence collimation to second polarised light.
Optionally, first collimation lens and second collimation lens be be made of convex lens and concavees lens it is saturating
Microscope group is closed.
Optionally, the reflecting mirror is automatic rotary reflecting mirror.
Optionally, the reflecting mirror is oppositely arranged with the polarization spectroscope, and the reflecting mirror and the polarization spectro
Mirror integrated molding is made.
Optionally, the polarization spectroscope includes prism and the polarization beam splitter on the prism hypotenuse/facet surfaces.
Optionally, the polarization beam splitter is multi-layer film structure setting.
Optionally, the light emitting unit further includes the light hole and diffraction being sequentially arranged in the propagation optical path of the light combination
Optical element, the cross-sectional area that the light hole is used to limit the light combination for entering the diffraction optical element is identical, described
Diffraction optical element is used to the incident light combination expanding into multi-beam.
The present invention also proposes a kind of light emitting devices, which includes:
Foregoing light emitting unit, for emitting light beam；
Diffusion unit, set on going out on light path for the light emitting unit, for by the light of the light emitting units emitting
Beam is converted into multiple diffusion light beams with different launch angles；And
Scanning element, it is multiple for issuing the diffusion unit set on going out on light path for the light emitting unit
The diffusion light beam is reflected to form multi-angle light beam.
Optionally, the diffusion unit includes one of diffuser, diffractive-optical element, lens combination unit, and institute
The hot spot for stating diffusion light beam is distributed with uniform strength.
Optionally, the scanning element includes galvanometer or rotating prism.
Optionally, the light emitting devices further includes driver；
The galvanometer includes reflecting mirror, and the reflecting mirror is connect with the driver, and the driver is described to drive
It is rotated on the direction that reflecting mirror is not parallel to each other at two.
The present invention also proposes a kind of distance-measuring equipment, which includes:
Foregoing light emitting devices, for emitting light beam to object under test；
Optical receiver apparatus, for receiving the light beam reflected through the object under test, and to the received light beam at
Reason forms beam information；
Control device is electrically connected with the light emitting devices and the optical receiver apparatus respectively, and the control device is used
Emit light beam to the object under test in controlling the light emitting devices, controls the optical receiver apparatus and receive through the determinand
The light beam of body reflection, and receive the beam information formed after optical receiver apparatus processing.
It is designed based on this structure, in the inventive solutions, since light emitting unit includes that two optical axises are set in parallel
The first light emitting end and the second light emitting end set, and the first polarised light and the second light emitting end hair that the first light emitting end issues
The exit direction of the second polarised light out is parallel but direction of vibration is vertical, in this way, the first polarised light after reflecting mirror reflects with
After brewster angle incidence to polarization spectroscope, will completely through polarization spectroscope, meanwhile, the second polarised light is with Brewster
It, can be all to external reflectance, in this way, the first polarised light can after polarization spectroscope acts on after angle is incident to polarization spectroscope
To be completely coincident with the second polarised light as a branch of light combination.Since this light combination has polymerize the light ray energy of two light emitting ends sending,
Therefore compared to the light emitting devices of common distance-measuring equipment at present for, be obtained with higher light using this light emitting unit
Source luminous power, and then effectively improve the detection range of this distance-measuring equipment.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is a kind of light channel structure schematic diagram of an embodiment of light emitting unit provided by the invention；
Fig. 2 is a kind of light channel structure schematic diagram of another embodiment of light emitting unit provided by the invention；
Fig. 3 is a kind of polarization beam splitter schematic illustration of light emitting unit provided by the invention；
Fig. 4 is the light channel structure schematic diagram of light emitting devices provided in an embodiment of the present invention；
Fig. 5 is the functional module structure schematic diagram of distance-measuring equipment provided in an embodiment of the present invention.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 101 | First light emitting end | 102 | Second light emitting end |
| 105 | Reflecting mirror | 106 | Polarization spectroscope |
| 100 | Light emitting unit | 13 | Light combination |
| 11 | First polarised light | 12 | Second polarised light |
| 103 | First collimation lens | 104 | Second collimation lens |
| 107 | Light hole | 108 | Diffraction optical element |
| 200 | Diffusion unit | 300 | Scanning element |
| 10 | Light emitting devices | 1 | Distance-measuring equipment |
| 2 | Object under test | 20 | Optical receiver apparatus |
| 30 | Control device |
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
It should be noted that it can be directly another when element is referred to as " being fixed on " or " being set to " another element
On one element or indirectly on another element.When an element is known as " being connected to " another element, it can
To be directly to another element or be indirectly connected on another element.
It should also be noted that, the positional terms such as left and right, upper and lower in the embodiment of the present invention, are only relatively general each other
It reads or be to refer to the normal operating condition of product, and should not be regarded as restrictive.
It should also be noted that, being defined in the embodiment of the present invention according to the XY rectangular coordinate system established in Fig. 1: being located at X
The side of axis positive direction is defined as front, and the side positioned at X-axis negative direction is defined as rear；It is fixed positioned at the side of Y-axis positive direction
Justice is left, and the side positioned at Y-axis negative direction is defined as right.
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " length ", " width ", "upper", "lower", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom" "inner" and "outside" is based on attached drawing institute
The orientation or positional relationship shown, is merely for convenience of description of the present invention and simplification of the description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to limit of the invention
System.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
The embodiment of the present invention provides a kind of light emitting unit.
Referring to Fig. 1, in one embodiment, which includes light emission component, reflecting mirror 105 and partially
Shake spectroscope 106；Wherein, light emission component includes optical axis the first light emitting end 101 disposed in parallel and the second light emitting end
102, the first light emitting end 101 is used to issue the second polarised light 12 for issuing the first polarised light 11, the second light emitting end 102,
First polarised light 11 is parallel with 12 exit direction of the second polarised light but direction of vibration is vertical；Reflecting mirror 105 is set to the first polarised light
In 11 propagation optical path, and it is opposite with 101 position of the first light emitting end；Polarization spectroscope 106 is set to the first polarised light 11 and the
In the propagation optical path of two polarised lights 12, and it is opposite with 102 position of the second light emitting end；Polarization spectroscope 106 is for receiving through anti-
The first polarised light 11 reflection of mirror 105 and with brewster angle incidence is penetrated, and reflection is with the second of brewster angle incidence
Polarised light 12, the second polarised light 12 after the reflection of polarization spectroscope 106 are polarized with first completely through polarization spectroscope 106
Light 11 is combined into a branch of light combination 13.
It is designed based on this structure, in the inventive solutions, since light emitting unit 100 includes that two optical axises are parallel
The first light emitting end 101 and the second light emitting end 102 being arranged, and 11 He of the first polarised light that the first light emitting end 101 issues
The exit direction for the second polarised light 12 that second light emitting end 102 issues is parallel but direction of vibration is vertical, in this way, the first polarised light
11 by reflecting mirror 105 reflection after with brewster angle incidence to polarization spectroscope 106 after, will be completely through polarization spectroscope
106, meanwhile, after the second polarised light 12 is with brewster angle incidence to polarization spectroscope 106, understand all to external reflectance, in this way, through
After crossing the effect of polarization spectroscope 106, the first polarised light 11 can be completely coincident as a branch of light combination 13 with the second polarised light 12.By
It has polymerize the light ray energy of two light emitting ends sending in this light combination 13, therefore compared to the light of distance-measuring equipment 1 common at present hair
For injection device 10, it is obtained with higher light source luminescent power using this light emitting unit 100, and then effectively improve this survey
Detection range away from equipment 1.
Referring to Fig. 1, in the present embodiment, the first light emitting end 101 and the second light emitting end 102 include to issue
The polarized light source or polarization laser of polarised light；Certainly, in other embodiments, the first light emitting end 101 and the second light emitting
End 102 can also form the light emitting end of optimization comprising optical components such as lens, light cones, herein with no restrictions.In addition, light is sent out
Penetrating unit 100 further includes the first collimation lens 103 and the second collimation lens 104, and the first collimation lens 103 is set to the first light emitting
End 101 goes out on light path, to carry out convergence collimation to the first polarised light 11；Second collimation lens 104 is sent out set on the second light
It penetrates on the light path out at end 102, to carry out convergence collimation to the second polarised light 12.It specifically, is the first polarization with X-Y plane
Plane where the propagation optical path of light 11 and the second polarised light 12, the P that there is the first polarised light 11 direction of vibration to be parallel to X-Y plane
Polarization direction, i.e. P light, the second polarised light 12 have direction of vibration perpendicular to the s-polarization direction of X-Y plane, i.e. S light.In this way, the
The first polarised light 11 that one light emitting end 101 issues forms the transmitting light beam 11 ' of collimation and sends out after the first collimation lens 103
It is incident upon reflecting mirror 105, transmitting light beam 11 ' forms the reflected beams 11 " after the reflection of reflecting mirror 105, then emits again to polarization point
The plane of incidence of light microscopic 106, according to polarization spectro principle, when the reflected beams 11 " are with brewster angle incidence to polarization spectroscope
106, P light all penetrate, and in other words, the incident angle by adjusting the reflected beams 11 " can just make it all through polarization point
Light microscopic 106, and form a part of outgoing light combination 13.Meanwhile second light emitting end 102 issue the second polarised light 12 through second
After collimation lens 104, the transmitting light beam 12 ' for forming collimation is concurrently incident upon the reflecting surface of polarization spectroscope 106, according to polarization spectro
Principle, when emitting light beam 12 ' with brewster angle incidence to polarization spectroscope 106, S light all reflects, and in other words, passes through tune
The incident angle of section transmitting light beam 12 ', will can make it all reflect to form outgoing light combination in the reflecting surface of polarization spectroscope 106
13 a part.It by the reflecting surface that S light reflects is P light in polarization spectroscope 106 it should be noted that in the present embodiment
Exit facet.
Right the design is without being limited thereto, in another embodiment as shown in fig. 2, the design principle and Fig. 1 of light channel structure
It is identical, and same performance can be reached, only change the placement orientation of corresponding device, wherein the first light emitting end 101 with partially
The position of vibration spectroscope 106 is opposite, and the second light emitting end 102 is opposite with the position of reflecting mirror 105, the first light emitting end 101 hair
The first polarised light 11 out is directly all by polarization spectroscope 106, and the second polarised light 12 of the second light emitting end 102 sending
It is then fully reflective by polarization spectroscope 106 again after the reflection of reflecting mirror 105, and then the first polarised light 11 and the second polarised light 12
It will be completely coincident to form a branch of light combination 13.
Further, in the present embodiment, the first collimation lens 103 and the second collimation lens 104 for by convex lens and
The lens combination of concavees lens composition.These ordinary optical lens are respectively arranged at the first light emitting end 101 and the second light emitting end
102 go out on light path, is mainly used for converging light beam and being collimated, to improve the energy density of hot spot, so that all partially
The luminous energy that shakes enters in next optical component, is further reduced unnecessary optical energy attenuation.
Further, in the present embodiment, reflecting mirror 105 is automatic rotary reflecting mirror 105.Specifically, automatic rotation
Formula reflecting mirror 105 can be controlled by the realization (not shown) of the control device 30 inside distance-measuring equipment 1, and by adjusting reflecting mirror 105
With horizontal direction, that is, X-direction angle, so that the first polarised light 11 and the second polarised light 12 finally can be returned strictly, and then make
The hot spot for the light combination 13 that must be emitted is minimum, energy is maximum.
Further, in the present embodiment, reflecting mirror 105 is oppositely arranged with polarization spectroscope 106, and reflecting mirror 105 with
The integrated molding of polarization spectroscope 106 is made, and then improves the stability of entire light path system, and realizes the controllability of angle.
Further, in the present embodiment, polarization spectroscope 106 includes prism and the polarization beam splitter on prism hypotenuse/facet surfaces, and inclined
Vibration spectro-film is preferably multi-layer film structure setting, and the light beam with different polarization direction is reflected and/or transmitted to realize.
Structure, material of polarization beam splitter etc. need according to actual needs, such as wavelength, the transmission requirement of light are rationally designed, this
Place is with no restrictions.
Fig. 3 is to specifically show polarization point according to a kind of polarization beam splitter schematic illustration provided in an embodiment of the present invention
Relationship between the light transmission rate and wave band of light film.Transmittance curve as shown in Figure 3 can be seen that, in certain wave-length coverage
It is interior, when incident light with brewster angle incidence to polarization spectroscope 106 when, P light all penetrates, and S light all reflects；Specifically,
The polarization spectro membrane structure designed in the present embodiment can make the light in 700nm to 1000nm wave band realize P light all transmission, S
The effect that light all reflects.
Referring to Fig. 1, in the present embodiment, light emitting unit 100 further includes being sequentially arranged in the propagation optical path of light combination 13
Light hole 107 and diffraction optical element 108, light hole 107 be used for limit enter diffraction optical element 108 light combination 13 cross
Sectional area is identical, and diffraction optical element 108 is used to incident light combination 13 expanding into multi-beam, and then, these light beams are encoded
The pattern to form structuring can be projected to object space afterwards.Certainly, in other embodiments, diffraction optical element 108 can also
To use other any optical elements that can form spot, for example, MLA (Microlens Array Optics Films, it is micro-
Lens array), grating or one or more combinations of a variety of optical elements etc., herein with no restrictions.
The present invention also proposes a kind of light emitting devices 10, referring to Fig. 4, the light emitting devices 10 includes for emitting light beam
Aforementioned light emitting unit 100, diffusion unit 200 and scanning element 300.Wherein, the specific structure ginseng of the light emitting unit 100
It is same to have since this light emitting devices 10 uses whole technical solutions of above-mentioned all embodiments according to above-described embodiment
There are all beneficial effects brought by the technical solution of above-described embodiment, this is no longer going to repeat them,.In addition, diffusion unit 200
Set on going out on light path for light emitting unit 100, the light beam i.e. light combination 13 for emitting light emitting unit 100, which is converted into, to be had
Multiple diffusion light beams, such as light beam 14, light beam 15 and light beam 16 of different launch angles etc.；Scanning element 300 is set to light emitting
Unit 100 goes out on light path, and multiple diffusion light beams for issuing diffusion unit 200 are reflected to form multi-angle light
Beam, such as light beam 14 ', light beam 15 ' and light beam 16 ' etc., in this way, can effectively expand the detection range of this light emitting devices 10.This
It outside, further include light drive circuit (not shown) in light emitting devices 10, light drive circuit electrically connects with light emitting unit 100
It connects, to drive light emitting unit 100 to work.Here, this light emitting devices 10 in addition to include aforementioned light emitting unit 100 other than,
It can also include other kinds of light emitting devices 10, herein with no restrictions.
Further, diffusion unit 200 includes one of diffuser, diffractive-optical element, lens combination unit, and is expanded
The hot spot of spreading beam is distributed with uniform strength.In the present embodiment, diffusion unit 200 is preferably diffuser, common shape
Shape has round, rectangular, rectangle, ellipse, hexagon etc., and in addition to this, diffuser is also designed to almost any shape of
Image, therefore light diffuser is also referred to as light arbitrary graphic generator, and the intensity distribution customization etc. to light pattern may be implemented.Example
Such as, as shown in figure 4, the light beam that the light beam 13 that light emitting devices 10 issues generates after diffusion unit 200, the angle of departure is along longitudinal direction
Difference, so as to expand longitudinal field range of light emitting devices 10；Alternatively, what light beam 13 generated after diffusion unit 200
Light beam, the angle of departure is transversely different, so as to expand the transverse field range of light emitting devices 10；Or light beam 13
The light beam generated after diffusion unit 200, the angle of departure transversely with longitudinal difference, so as to expand light emitting devices simultaneously
10 transverse field range and longitudinal field range.Here, for convenience of description, the difference that will be generated after diffusion unit 200
Angle light beam is denoted as the first light beam 14, the second light beam 15 and third light beam 16 respectively, obtains difference after the reflection of scanning element 300
The light beam of angle is denoted as the first the reflected beams 14 ', the second the reflected beams 15 ' and third the reflected beams 16 '；It should be noted that
Light beam after the diffusion of diffusion unit 200 includes multi-angle light beam, the first light beam 14, second in embodiment as shown in Figure 4
Light beam 15 and third light beam 16 are only a part of light beam therein.
Further, scanning element 300 includes galvanometer or rotating prism, and specifically, scanning element 300 is shaken including MEMS
Mirror, mechanical galvanometer or other rotating prisms etc..In the present embodiment, light emitting devices 10 further includes driver；Galvanometer includes
Reflecting mirror 105, reflecting mirror 105 are electrically connected with driver with reflecting mirror 105, and driver is to drive reflecting mirror 105 in two phases
It is rotated on the direction being not parallel to each other.In this way, when the rotation angle of galvanometer changes, the first light beam 14, the second light beam 15 and the
The angle of the opposite galvanometer of three light beam 16 is also changing, so that different degrees of deflection occurs for corresponding the reflected beams,
And then the scanning field of view of light emitting devices 10 is significantly greatly increased.Specifically, if two that reflecting mirror 105 is rotated are not parallel
Direction is denoted as first direction and second direction respectively, for example, can be denoted as respectively when first direction and second direction are mutually perpendicular to
Corresponding lateral X-direction and corresponding longitudinal Y-direction, and the plane where it is 300 institute of light emitting unit 100 and scanning element
Plane, at this point, driver drives the reflecting mirror 105 to rotate in the x-direction and the z-direction, so that it may allow light beam in the side X
To with the enterprising horizontal deflection of Y-direction, to realize the large field of view scan of light beam in the x-direction and the z-direction.
The present invention also proposes a kind of distance-measuring equipment 1.Referring to Fig. 5, the distance-measuring equipment 1 includes foregoing for emitting
Light beam is to the light emitting devices 10 of object under test 2, optical receiver apparatus 20 and control device 30.Wherein, optical receiver apparatus 20 are used
In the light beam that reception is reflected through object under test 2, and processing is carried out to received light beam and forms beam information；Control device 30 is distinguished
It is electrically connected with light emitting devices 10 and optical receiver apparatus 20, control device 30 emits light beam extremely for controlling light emitting devices 10
Object under test 2, control optical receiver apparatus 20 receive the light beam reflected through object 2, and receive after the processing of optical receiver apparatus 20
The beam information of formation.
It should be noted that, distance-measuring equipment 1 can be structure light depth camera, TOF depth camera, laser radar etc. herein.
In one embodiment, distance-measuring equipment 1 be structure light depth camera, light emitting devices 10 be projective module group, for
Encoded structured pattern light beam, such as random spot pattern etc. are projected in object space；Optical receiver apparatus 20 is imaging mould
Group is formed by structured light patterns for acquiring to be radiated on target object, includes, but not limited to, e.g. the images such as CCD or CMOS
Sensor, optical filter and imaging len etc.；Control device 30 is processor, for calculating collected structured light patterns
To depth image, wherein processor can be, but not limited to be FPGA, ASIC, DSP, CPU etc., alternatively, when depth camera is embedded into
When into other terminal devices, processor can be the processor in terminal device, such as mobile phone application processor or calculating
Machine CPU etc..
In another embodiment, distance-measuring equipment 1 is TOF depth camera, and light emitting devices 10 is projective module group, is used for mesh
Mark the modulated light beam of spatial emission；Optical receiver apparatus 20 is imaging modules, for receiving modulation light beam；Control device 30 is place
Device is managed, calculates target depth for calculating beam emissions to the received time difference, and based on the time difference.
In another embodiment, distance-measuring equipment 1 is laser radar system, and light emitting devices 10 is laser beam emitting device 10,
For emitting modulated pulsed light to body to be measured；Optical receiver apparatus 20 includes photodetector, image processor etc., for pair
The reflected beams received are received and processed；Control device 30 includes register, processor, control circuit etc., for pair
Light emitting devices 10 and optical receiver apparatus 20 are accordingly controlled and are handled.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modification, equivalent replacement or improvement etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (13)
1. a kind of light emitting unit characterized by comprising
Light emission component, including optical axis the first light emitting end disposed in parallel and the second light emitting end, first light emitting end
For issuing the first polarised light, second light emitting end is for issuing the second polarised light, first polarised light and described the
Two polarised light exit directions are parallel but direction of vibration is vertical；
Reflecting mirror, in the propagation optical path of first polarised light, and it is opposite with first light emitting end position；And
Polarization spectroscope, in the propagation optical path of first polarised light and second polarised light, and with second light
It is opposite to emit end position；
The polarization spectroscope is used to receive the first polarised light reflecting through the reflecting mirror and with brewster angle incidence, with
And second polarised light of the reflection with second polarised light of brewster angle incidence, after polarization spectroscope reflection
A branch of light combination is combined into first polarised light completely through the polarization spectroscope.
2. light emitting unit as described in claim 1, which is characterized in that first light emitting end and second light emitting
End includes the polarized light source or polarization laser to issue polarised light；
The light emitting unit further includes the first collimation lens and the second collimation lens, and first collimation lens is set to described the
One light emitting end goes out on light path, to carry out convergence collimation to first polarised light；Second collimation lens is set to
Second light emitting end goes out on light path, to carry out convergence collimation to second polarised light.
3. light emitting unit as claimed in claim 2, which is characterized in that first collimation lens and second collimation are saturating
Mirror is the lens combination being made of convex lens and concavees lens.
4. light emitting unit as described in claim 1, which is characterized in that the reflecting mirror is automatic rotary reflecting mirror.
5. light emitting unit as claimed in claim 4, which is characterized in that the reflecting mirror is opposite with the polarization spectroscope to be set
It sets, and the reflecting mirror is made with polarization spectroscope integrated molding.
6. light emitting unit as described in claim 1, which is characterized in that the polarization spectroscope includes prism and is set to described
Polarization beam splitter on prism hypotenuse/facet surfaces.
7. light emitting unit as claimed in claim 6, which is characterized in that the polarization beam splitter is multi-layer film structure setting.
8. light emitting unit as described in any one of claim 1 to 7, which is characterized in that the light emitting unit further include according to
Secondary light hole and diffraction optical element in the propagation optical path of the light combination, the light hole spread out described in entrance for limiting
The cross-sectional area for penetrating the light combination of optical element is identical, and the diffraction optical element is used to expand into the incident light combination
Multi-beam.
9. a kind of light emitting devices characterized by comprising
Light emitting unit as described in claim 1 to 8 any one, for emitting light beam；
Diffusion unit, set on going out on light path for the light emitting unit, for turning the light beam of the light emitting units emitting
Turn to multiple diffusion light beams with different launch angles；And
Scanning element, it is multiple described for issuing the diffusion unit set on going out on light path for the light emitting unit
Diffusion light beam is reflected to form multi-angle light beam.
10. light emitting devices as claimed in claim 9, which is characterized in that the diffusion unit includes diffuser, optical diffraction
One of element, lens combination unit, and the hot spot of the diffusion light beam is distributed with uniform strength.
11. light emitting devices as claimed in claim 9, which is characterized in that the scanning element includes galvanometer or rotation rib
Mirror.
12. light emitting devices as claimed in claim 9, which is characterized in that the light emitting devices further includes driver；
The galvanometer includes reflecting mirror, and the reflecting mirror is connect with the driver, and the driver is to drive the reflection
It is rotated on the direction that mirror is not parallel to each other at two.
13. a kind of distance-measuring equipment characterized by comprising
Light emitting devices as described in claim 9 to 12 any one, for emitting light beam to object under test；
Optical receiver apparatus carries out processing shape for receiving the light beam reflected through the object under test, and to the received light beam
At beam information；
Control device is electrically connected with the light emitting devices and the optical receiver apparatus respectively, and the control device is for controlling
It makes the light emitting devices and emits light beam to the object under test, it is anti-through the object under test to control the optical receiver apparatus reception
The light beam penetrated, and receive the beam information formed after optical receiver apparatus processing.
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