CN103543495B - Image acquisition and in-situ projection optical device - Google Patents
Image acquisition and in-situ projection optical device Download PDFInfo
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- CN103543495B CN103543495B CN201310338283.6A CN201310338283A CN103543495B CN 103543495 B CN103543495 B CN 103543495B CN 201310338283 A CN201310338283 A CN 201310338283A CN 103543495 B CN103543495 B CN 103543495B
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Abstract
The invention discloses an image acquisition and in-situ projection optical device which comprises a wavelength division multiplexing module, an optical fiber collimator, a focusing lens, an MEMS (micro-electro-mechanical system) scanning mirror, a photoelectric detection module and an imaging and projection control module. The wavelength division multiplexing module is used for multiplexing two light beams with different wavelengths into an optical fiber; the optical fiber collimator is used for collimating light beams outputted from the optical fiber; the focusing lens is used for focusing the collimated light beams; the MEMS scanning mirror is used for reflecting the focused light beams to the surface of an imaging object; the photoelectric detection module is used for receiving near-infrared light reflected by the surface of the imaging object and converting the near-infrared light into electric signals; the wavelength division multiplexing module outputs the two light beams with the different wavelengths under the control of the imaging and projection control module according to the electric signals, and the imaging and projection control module is further used controlling the deflection speed of the MEMS scanning mirror. The image acquisition and in-situ projection optical device has the advantages that light outputted by an imaging light source and light outputted by a projection light source are coupled into the same optical fiber, then are collimated and are outputted, so that light paths of the light outputted by the imaging light source and the light outputted by the projection light source can be assuredly coincided with each other, and drift-free projection images can be acquired from the surface of the object; the image acquisition and in-situ projection optical device is stable in performance, small in size and low in cost.
Description
Technical field
The invention belongs to technical field of image detection, more specifically, relate to the optical devices of a kind of image acquisition and in-situ projection.
Background technology
Visible light wave range is 390-780nm, when body surface each several part can form the reflectivity of differentiation to the light of this wave band, just can produce color or gray scale, form the visible image of human eye.But also there is a lot of object, its surperficial each several part, to visible light reflectance no significant difference, therefore under visible light illumination, can not present the visible surface image of human eye.If other light made into outside with visible light wave range irradiate, just may produce the reflectivity of differentiation, but the image presented can not be observed directly by human eye, can only detect with various photodetector.
The people that such as some colour of skin is comparatively dark or fat deposit is partially thick, the vein profile of its back of the hand is very not high-visible, and when with near infrared light, then can produce the reflectivity of notable difference, form image, but the non-human eye of this image is visible.If can detect this image with the photodetector of near-infrared band, then modulate visible ray with the view data detected, in-situ projection back in one's hands, then can observe the clear profile of vein.
Therefore to the body surface image that human eye can not directly be observed, can by the spectral signature of object analysis, select to carry out irradiating object with a kind of light of wavelength (invisible light), and gather image information with corresponding photodetector, again by the light (visible ray) of another kind of wavelength, by the surface of image in-situ projection to object, its effect is equal to the surface image that human eye observes directly object.
Existing image acquisition and in-situ projection technology mainly contain two kinds, the first is directly to body surface imaging with infrared CCD, with liquid crystal panel, image is projected to body surface by visible ray again, the advantage of this technical scheme is that imaging and projection speed are fast, and shortcoming is cost intensive; The second is formed scanning imaging system with infrared light, scanning mirror, photo-detector, scanning-projection system is formed with visible ray and scanning mirror, the advantage of this technical scheme is that cost is lower, its imaging is slightly low with projection speed, but can meet the demands, because the persistence of vision effect of human eye, as long as projection speed reaches more than 25 frames per second.
Image acquisition and in-situ projection technology, require that projecting light path overlaps completely with imaging optical path, above two kinds of technical schemes, the conllinear design of the two is all realized by space optical path, used many groups prism and light conducting path lens adjustment, light channel structure is complicated, not only regulates trouble, error larger, and take up room, be difficult to accomplish miniaturization.In above first scheme, as shown in Figure 1, near-infrared light source 1 sends near infrared light, after filtration wave plate and follow-up lens combination constraint beam size after and focus on projected objects surface, then near infrared light beam incides line scanning mirror, if positioned by each point by XY coordinate system by body surface, light beam just can scan by minute surface along the X direction that rotate line scanning mirror.Then near infrared light beam incides field scan mirror, and light beam just can scan by the minute surface of rotating scanning mirror along the Y direction, so just each point of body surface can be scanned.Near infrared light beam is converted into electric signal and is input in control module after body surface reflection after photodetector process, controls visible light source 2 and sends visible ray, and allows photoelectric detection module break-off.Visible ray, after above-mentioned light path route, finally projects body surface imaging, shows venous locations.Adopt a line scanning mirror and a field scan mirror, realize two-dimensional scan imaging and projection, two scanning mirrors make light channel structure complicated, and are difficult to realize Miniaturization Design.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides the optical devices of a kind of image acquisition and in-situ projection, its object is to provide a kind of optical devices that can realize the inregister of projecting light path and imaging optical path, solve the complicated and technical matters that error is large of light channel structure in prior art thus.
The invention provides the optical devices of a kind of image acquisition and in-situ projection, comprise Wavelength division multiplexing module, for by multiplexing for the light beam of two kinds of different wave lengths in optical fiber; Optical fiber collimator, is connected with described Wavelength division multiplexing module by described optical fiber, for being collimated by the light beam exported in described optical fiber; Condenser lens, for focusing on the light beam after collimation; MEMS scanning mirror, for surperficial to imaging object by the beam reflection after focusing; Photoelectric Detection module, for receiving near infrared light that described imaging object surface reflection returns and being changed into electric signal; And imaging and projection control module, respectively with described Wavelength division multiplexing module, described MEMS scanning mirror and described Photoelectric Detection model calling, for controlling according to described electric signal the light beam that described Wavelength division multiplexing module exports two kinds of different wave lengths, and control the deflection speed of described MEMS scanning mirror, also control described Photoelectric Detection module to work when near infrared light, the break-off when visible ray.
Further, described Wavelength division multiplexing module comprises the first semiconductor laser, the second semiconductor laser, filter plate and the first optical fiber head; The input control end of described first semiconductor laser is connected, as imaging source, for exporting the light beam of a kind of wavelength (imaging source uses near infrared light) with described imaging and the control module that projects; The input control end of described second semiconductor laser is connected, as projection light source, for exporting the light beam of another kind of wavelength (projection light source is visible ray) with described imaging and the control module that projects; The light beam of two kinds of different wave lengths is multiplexed in same optical fiber respectively by described filter plate and described first optical fiber head.
Further, described optical fiber collimator comprises coaxial the second optical fiber head, collimation lens and the glass tube that arrange; Described glass tube is the structure of annular cylinder and inner hollow, described second optical fiber head and described collimation lens are arranged in described glass tube, described second optical fiber head is used for fixed fiber, and described glass tube is used for fixing described second optical fiber head and described collimation lens.
Further, described collimation lens is the first cylindrical lens, and the input surface of described first cylindrical lens is plane, and the output surface of described first cylindrical lens is convex spherical.
Further, described collimation lens is the second cylindrical lens, and the input surface of described second cylindrical lens is plane, and the output surface of described second cylindrical lens is plane, and the refractive index of described second cylindrical lens is radially successively decreased according to parabola rule gradual change.
Further, diameter 2 ω of the focal beam spot of described condenser lens
f, size 2 ω of collimated light beam
cformula is met with the focal distance f of described condenser lens
λ is the wavelength of near infrared light or the wavelength of visible ray.
Further, the sweep velocity of described MEMS scanning mirror is greater than 25 frames per second.
Present invention also offers a kind of medical vein image instrument, comprise for near infrared light imaging, then by visible ray in-situ projection in the optical devices of object under test, it is characterized in that, the optical devices that described optical devices are above-mentioned.
The present invention collimates output again because light that imaging source and projection light source export is coupled in same optical fiber, therefore can ensure that the light path of the two overlaps completely, thus can obtain rift-free projected image at body surface.And the feature that Wavelength division multiplexing module has stable performance and volume is little, cost is low; Adopt two-dimentional MEMS scanning mirror, further simplify light channel structure and reduce the size of system)
Accompanying drawing explanation
Fig. 1 is the structural representation of the optical devices that prior art provides;
Fig. 2 is the modular structure schematic diagram of the optical devices of the image acquisition that provides of the embodiment of the present invention and in-situ projection;
Fig. 3 is the structural representation of Wavelength division multiplexing module in the optical devices of the image acquisition that provides of the embodiment of the present invention and in-situ projection;
Fig. 4 is the structural representation of optical fiber collimator in the optical devices of the image acquisition that provides of the embodiment of the present invention and in-situ projection;
Fig. 5 is the structural representation of MEMS scanning mirror in the optical devices of the image acquisition that provides of the embodiment of the present invention and in-situ projection.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
In view of above-mentioned, for the deficiencies in the prior art, the present invention is by introducing optical fiber and MEMS(Micro-Electro-Mechanical Systems, microelectromechanical systems) technology, propose the optical devices of a kind of novel image acquisition and in-situ projection, the inregister of projecting light path and imaging optical path can be realized, and have the advantages that structure is simple, volume is little and cost is low.
The optical devices of the image acquisition that the present invention proposes and in-situ projection, comprise Wavelength division multiplexing module 1, optical fiber collimator 2, condenser lens 3, MEMS scanning mirror 4, Photoelectric Detection module 5 and imaging and projection control module 6.The light that Wavelength division multiplexing module 1 exports outputs to optical fiber collimator 2 by optical fiber, and then light beam is by light path through condenser lens 3, and wherein the center of optical fiber collimator 2 and the center of condenser lens 3 coexist beam center, and MEMS scanning mirror 4 center is arranged at the center of light beam.Photoelectric Detection module 5 is placed on the beam path after body surface reflection, imaging and projection control module 6 control the deflection speed of cut-offfing of two light sources in Wavelength division multiplexing module 1 and MEMS scanning mirror 4, control Photoelectric Detection module 5 to work when near infrared light, the break-off when visible ray simultaneously.
Wherein, Wavelength division multiplexing module 1 comprises two and launches the semiconductor laser of different wave length, a filter plate and an optical fiber head, two laser instruments are respectively as imaging source and projection light source, and the light beam of the two different wave length sent, is multiplexed in same optical fiber by filter plate.The light beam exported in optical fiber collimates by optical fiber collimator 2.Light beam after collimation carries out focusing on imaging object surface by condenser lens 3.MEMS scanning mirror 4 is surperficial to imaging object by beam reflection.Photoelectric Detection module 5 receives near infrared light that imaging object surface reflection returns and is changed into electric signal, and electric signal is input to imaging and projection control module 6 by circuit.Imaging and projection control module 6 control the deflection speed of cut-offfing of two semiconductor lasers in Wavelength division multiplexing module 1 and MEMS scanning mirror 4 respectively by circuit, control Photoelectric Detection module 5 simultaneously and work when near infrared light, the break-off when visible ray.
The principle of work of these optical devices is, first the imaging source lighted in Wavelength division multiplexing module 1 by imaging and projection control module 6 sends near infrared light, near infrared light signal incides optical fiber collimator 2 and nearly infrared signal is converted to collimation near infrared light beam, collimated infrared beam focuses on MEMS scanning mirror 4 after inciding condenser lens 3, and provides Control of Voltage its deflection speed by imaging and projection control module 6.MEMS scanning mirror 4 incident beam is reflected and focus on imaging object surface certain point after, near infrared light beam reflects again, and the near infrared light signal of reflection is incided photoelectric detection module 5, the reflected light of photoelectric detection module 5 detection imaging body surface, light signal strength received by the difference of imaging object surface is different thus record the reflectivity of different reflection spot, the gradation of image of reflection spot is obtained with this, then feed back to imaging and projection control module 6 one electric signal by photoelectric detection module 5 to make imaging and projection control module 6 control Wavelength division multiplexing module 1 to turn off near-infrared light source, open projected visible-light source and send visible light signal, meanwhile imaging and projection module 6 control Photoelectric Detection module 5 and work when near infrared light, the break-off when visible ray.Then visible light signal incides optical fiber collimator 2 and visible light signal is converted to collimated visible light beam, collimated visible light beam focuses on its focus place MEMS scanning mirror 4 after inciding condenser lens 3, incident beam projects and focuses on first reflection position, imaging object surface by MEMS scanning mirror 4.By the cooperation control of imaging with projection control module 6, MEMS scanning mirror 4 is allowed to carry out two-dimensional scan with the speed being greater than 25 frames per second, and the response of Photoelectric Detection module 5 and Wavelength division multiplexing module 1 and switch speed are higher than sweep velocity, just stable two-dimensional projection image can be obtained at body surface.
In embodiments of the present invention, optical fiber collimator is made up of an optical fiber head and a collimation lens.Collimation lens in described optical fiber collimator can adopt C-Lens or GRIN Lens, the spot size of collimated light beam, depends on the parameter of adopted lens.Optical fiber head in described optical fiber collimator and Wavelength division multiplexing module is by a kapillary fixed fiber, to carry out in the application assembling and locating.Kapillary in described optical fiber head, its internal diameter is a bit larger tham fibre external diameters, and its external diameter then designs according to the needs of location and assembling, and capillary material can adopt glass or pottery.Filter plate in Wavelength division multiplexing module, to imaging light wavelength transmission, and to projected light wavelength reflection; Or to imaging light wavelength reflection, and to projected light wavelength transmission.Two laser instruments in Wavelength division multiplexing module are semiconductor laser, and reliability is high, low in energy consumption and be beneficial to small-sized encapsulated.
As one embodiment of the present of invention, for the optical fiber of coupling output in Wavelength division multiplexing module, can be single-mode fiber, also can be multimode optical fiber.Condenser lens is made up of multi-disc simple lens, can carry out anaberration design, obtain less focal beam spot at body surface, ensures the image resolution ratio of imaging and projection.MEMS scanning mirror, can carry out two-dimensional scan along X-axis and Y-axis, and scan area depends on the drift angle amplitude of scanning mirror and the distance of scanned object and scanning mirror.
The embodiment of the present invention collimates output again because light that imaging source and projection light source export is coupled in same optical fiber, therefore can ensure that the light path of the two overlaps completely, thus can obtain rift-free projected image at body surface.And the feature that Wavelength division multiplexing module has stable performance and volume is little, cost is low.Adopt two-dimentional MEMS scanning mirror, further simplify light channel structure and reduce the size of system.
Main thought of the present invention is coupled in same optical fiber by wavelength-division multiplex technique imaging source and projection light source, then exported by optical fiber collimator, ensure that imaging optical path and projecting light path overlap completely from principle; With the line scanning mirror in the MEMS scanning mirror of two-dimensional deflection replacement traditional structure and field scan mirror two scanning mirrors, realize the Miniaturization Design of whole system.
The optical devices that the embodiment of the present invention provides compared with prior art, the key distinction is that prior art uses multiple lens combination to carry out light beam change to reach the light path coincidence of two light beams, but light beam has the angle of divergence when propagating, using poly-lens to be also the body surface that is finally projected in caused due to the angle of divergence in communication process in order to avoid two light beams is here the different and generation of this situation of projection distortion that causes of spot size.Meanwhile, the scan mode of this scheme separately scans X-direction and Y-direction with two scanning mirrors, so degree of integration is not high, occupies very large space.And the present invention uses optical fiber by two light beam coupling together, even if light beam has the angle of divergence in communication process, but be strapped in an optical fiber, so can well ensure that the light path of two light beams overlaps always.Use the MEMS scanning mirror that volume is small simultaneously, can scan X-direction and Y-direction simultaneously thus reach two-dimensional scan, and we make light beam arrival MEMS scanning mirror hot spot very little through the design of some structural parameters, can be reflected completely by MEMS.In addition, prior art is propagated in space light path, uses lens combination to carry out repeatedly light chopper, not only take up room, and light path coincidence poor effect, thus cause error.Two-beam is all coupling in an optical fiber by the present invention, thus accomplishes that light path overlaps.And in scanning and projection, original scheme scans X-direction and Y-direction respectively with two mirrors (being line scanning mirror and field scan mirror respectively) and project, thus reach two-dimensional scan.This programme is then use MEMS scanning mirror, and its structure is small, and uses electrostatic attraction or magnetic field graviational interaction in the X-axis of MEMS scanning mirror and Y-axis, MEMS scanning mirror can be rotated in the x-direction and the z-direction, thus carry out two-dimensional scan.
In order to the optical devices that the further description embodiment of the present invention provides, now by reference to the accompanying drawings the present invention is described further:
Accompanying drawings 2, in the specific embodiment of this image acquisition and in situ imaging optical devices, comprise Wavelength division multiplexing module 1, optical fiber collimator 2, condenser lens 3, MEMS scanning mirror 4, Photoelectric Detection module 5 and imaging and projection control module 6, wherein imaging and projection control module 6 can carry out cooperation control to Wavelength division multiplexing module 1, MEMS scanning mirror 4 and Photoelectric Detection module 6 three, thus the normal work of the system of guarantee.
Accompanying drawings 3, Wavelength division multiplexing module 1 comprises the first semiconductor laser 11, second semiconductor laser 13, filter plate 12 and the first optical fiber head 14, two laser instruments are respectively as imaging source and projection light source, the two light beam of different wave length sent, multiplexing and be coupled in same optical fiber by filter plate 12.Wherein the first semiconductor laser is as imaging source, exports near infrared light; Second semiconductor laser, as projection light source, exports visible ray; The light beam of two kinds of different wave lengths is multiplexed in same optical fiber respectively by filter plate and the first optical fiber head.
The principle of work of these optical devices is, first the imaging source lighted in Wavelength division multiplexing module 1 by imaging and projection control module 6 sends near infrared light, near infrared light signal incides optical fiber collimator 2 and nearly infrared signal is converted to collimation near infrared light beam, collimated infrared beam focuses on MEMS scanning mirror 4 after inciding condenser lens 3, and provides Control of Voltage its deflection speed by imaging and projection control module 6.MEMS scanning mirror 4 incident beam is reflected and focus on imaging object surface certain point after, near infrared light beam reflects again, and the near infrared light signal of reflection is incided photoelectric detection module 5, the reflected light of photoelectric detection module 5 detection imaging body surface, light signal strength received by the difference of imaging object surface is different thus record the reflectivity of different reflection spot, the gradation of image of reflection spot is obtained with this, then feed back to imaging and projection control module 6 one electric signal by photoelectric detection module 5 to make imaging and projection control module 6 control Wavelength division multiplexing module 1 to turn off near-infrared light source, open projected visible-light source and send visible light signal, meanwhile imaging and projection module 6 control Photoelectric Detection module 5 and work when near infrared light, the break-off when visible ray.Then visible light signal incides optical fiber collimator 2 and visible light signal is converted to collimated visible light beam, collimated visible light beam focuses on its focus place MEMS scanning mirror 4 after inciding condenser lens 3, incident beam projects and focuses on first reflection position, imaging object surface by MEMS scanning mirror 4.By the cooperation control of imaging with projection control module 6, MEMS scanning mirror 4 is allowed to carry out two-dimensional scan with the speed being greater than 25 frames per second, and the response of Photoelectric Detection module 5 and Wavelength division multiplexing module 1 and switch speed are higher than sweep velocity, just stable two-dimensional projection image can be obtained at body surface.
Accompanying drawings 4, optical fiber collimator 2 is made up of the second optical fiber head 21, collimation lens 22 and glass tube 23, and the second optical fiber head 21, collimation lens 22 and glass tube 23 are coaxially arranged; Glass tube 23 is the structure of annular cylinder and inner hollow, and the second optical fiber head 21 and described collimation lens 22 are arranged in glass tube 23, and the second optical fiber head 21 is for fixed fiber head and collimation lens 22.Wherein, glass tube is annular cylinder, inner hollow, and its internal diameter encloses optical fiber head and collimation lens, optical fiber head, in order to fixed fiber head and collimation lens.Optical fiber head is glass capillary, and optical fiber inserts pipe in optical fiber head, and optical fiber head is in order to play support and fixation to optical fiber, fibre external diameters is slightly less than optical fiber head internal diameter.The axis of collimation lens and optical fiber are on the same line.Comprehensive, glass tube, collimation lens, optical fiber lens, optical fiber are coaxial, and that is their axis is on same straight line.Second optical fiber head 21 pairs optical fiber plays support and positioning action, and its internal diameter is a bit larger tham fibre external diameters, and its external diameter then needs design according to assembling, and the second optical fiber head 21 is general with glass or ceramic material.Collimation lens 22 can adopt C-Lens or GRIN Lens, as accompanying drawing 4(a) shown in, C-Lens is a kind of cylindrical lens, and input and output surface is respectively plane and convex spherical, spot size 2 ω of collimated light beam
cdepend on mode field diameter 2 ω in light wavelength lambda, optical fiber
0, and C-Lens parameter: Refractive Index of Material n and sphere curvature radius R, such as formula (1).
As accompanying drawing 4(b) shown in, GRIN Lens is a kind of cylindrical lens of graded index, and two surfaces are plane, the refractive index of axis of lens line position is the highest, refractive index is radially successively decreased according to parabola rule gradual change, such as formula (2), and spot size 2 ω of collimated light beam
cdepend on mode field diameter 2 ω in light wavelength lambda, optical fiber
0, and Selfoc lens parameter: axial location refractive index n
0, gradually changed refractive index constant
with length of lens Z, such as formula (3).
The external diameter precision-fit of glass tube 23 internal diameter and the second optical fiber head 21 and collimation lens 22, ensures the second optical fiber head 21 and collimation lens 22 coaxial packaging, and thus collimated light beam exports along the axis direction of optical fiber collimator 2.
The type of selected collimation lens 22 appropriate design parameters, just can obtain the collimated light spot size of needs.Condenser lens 3 is made up of multi-disc simple lens and carries out anaberration design, diameter 2 ω of final focal beam spot
fdepend on size 2 ω of collimated light beam
cwith the focal distance f of condenser lens 3, such as formula (4).
Wherein, λ is the wavelength of near infrared light or the wavelength of visible ray.For near infrared light and visible ray, respectively there are two wavelength, ω now
cdifferent due to wavelength difference, therefore ω
falso can be different due to the difference of wavelength.Focal distance f should be a fixed value after calculating, the ω that the difference due to wavelength causes
fdifferent because the resolving ability of human eye be generally distinguish out.
Accompanying drawings 5, the minute surface of MEMS scanning mirror 4 is supported by two frameworks (X-axis framework and Y-axis framework) and two pairs of yawing axis (X yawing axis and y deflection axle), under the driving of electrostatic attraction or electromagnetic attraction, can along X-axis and Y-axis two axis tilts, thus the inclination reached minute surface, thus regulate the incident angle of incident light, make emergent light exit direction different thus imaging object surface scanned and projects, thus carrying out beam flying deflection.Light beam depends on the drift angle amplitude ± θ of scanning mirror in the sweep limit of body surface
x, ± θ
ywith the distance L of object and scanning mirror, such as formula (5).
D
x×D
y＝4Lθ
x×4Lθ
x（5）
What continue due to MEMS scanning mirror 4 carries out two-dimensional scan, in order to form stable projected image at body surface, requires that its sweep velocity is greater than 25 frames per second.Stay in the extremely of short duration period of certain deflection angle at scanning mirror, will by imaging and projection control module 6, complete and light imaging source, Photoelectric Detection, turn off imaging source, light a series of actions such as projection light source, therefore imaging and projection control module 6, Wavelength division multiplexing module 1, the response of Photoelectric Detection module 5 and switch speed is required, higher than the sweep velocity of MEMS scanning mirror 4.
The light exported due to imaging source and projection light source is coupled in same optical fiber and collimates output again, therefore can ensure that the light path of the two overlaps completely, rift-free projected image can be obtained at body surface, and the feature that Wavelength division multiplexing module 1 has stable performance and volume is little, cost is low.Adopt two-dimentional MEMS scanning mirror 4, have the advantages that size is little and scanning angle is large, be conducive to the Miniaturization Design of system, can be applied in some hand-held instrument.
A typical apply of this image acquisition and in-situ projection optical devices is exactly medical vein image instrument, the people that such as some colour of skin is comparatively dark or fat deposit is partially thick, the vein profile of its back of the hand is very not high-visible, optical devices of the present invention can be adopted, with near infrared light imaging, pass through visible ray in-situ projection again in the back of the hand, just can observe the clear profile of vein.
The present invention mainly contains 2 improvement (1) relative to prior art and uses optical fiber to accomplish that the light path of two light beams overlaps completely, original technology uses poly-lens group to carry out light chopper to accomplish that two light paths overlap to light beam, adjustment is complicated and degree of accuracy is low, and the present invention uses one with optical fiber, two-beam is all coupled in this root optical fiber, thus well reach the object of light path coincidence, do not need very complicated adjustment, and two light beam reach in same optical fiber light path overlap, degree of accuracy is also guaranteed.(2) MEMS scanning mirror is used to scan, scheme originally scans orthogonal both direction respectively with line scanning mirror and field scan mirror, thus reach two-dimensional scan, and in the present invention, use MEMS scanning mirror, principle is by making X-axis and Y-axis that MEMS scanning mirror is carried out omnibearing adjustment also namely light beam can be scanned along body surface by a MEMS scanning mirror to mirror two orthogonal axes and X-axis and Y-axis applying electrostatic attraction or electromagnetic attraction simultaneously, accomplish two-dimensional scan, this body structure of MEMS scanning mirror is small simultaneously, can accomplish that microminiaturization designs.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. optical devices for image acquisition and in-situ projection, is characterized in that, comprising:
Wavelength division multiplexing module (1), for by multiplexing for the light beam of two kinds of different wave lengths in optical fiber; The light beam of described two kinds of different wave lengths is respectively near infrared light and visible ray;
Optical fiber collimator (2), is connected with described Wavelength division multiplexing module (1) by described optical fiber, for being collimated by the light beam exported in described optical fiber;
Condenser lens (3), for focusing on the light beam after collimation;
MEMS scanning mirror (4), for surperficial to imaging object by the beam reflection after focusing;
Photoelectric Detection module (5), for receiving near infrared light that described imaging object surface reflection returns and being changed into electric signal; And
Imaging and projection control module (6), be connected with described Wavelength division multiplexing module (1), described MEMS scanning mirror (4) and described Photoelectric Detection module (5) respectively, the light beam of two kinds of different wave lengths is exported for controlling described Wavelength division multiplexing module (1) according to described electric signal, and control the deflection speed of described MEMS scanning mirror (4), also control described Photoelectric Detection module (5) to work when near infrared light, quit work when visible ray;
Described Wavelength division multiplexing module (1) comprises the first semiconductor laser (11), the second semiconductor laser (13), filter plate (12) and the first optical fiber head (14);
The input control end of described first semiconductor laser (11) is connected, as imaging source, for exporting a kind of light beam of wavelength with described imaging and the control module (6) that projects;
The input control end of described second semiconductor laser (13) is connected, as projection light source, for exporting the light beam of another kind of wavelength with described imaging and the control module (6) that projects;
The light beam of two kinds of different wave lengths is multiplexed in same optical fiber respectively by described filter plate (12) and described first optical fiber head (14).
2. optical devices as claimed in claim 1, is characterized in that, described optical fiber collimator (2) comprises coaxial the second optical fiber head (21), collimation lens (22) and the glass tube (23) that arrange; Described glass tube (23) is for annular cylinder and the structure of inner hollow, described second optical fiber head (21) and described collimation lens (22) are arranged in described glass tube (23), described second optical fiber head (21) is for fixed fiber, and described glass tube is used for fixing described second optical fiber head and described collimation lens.
3. optical devices as claimed in claim 2, it is characterized in that, described collimation lens (22) is the first cylindrical lens, and the input surface of described first cylindrical lens is plane, and the output surface of described first cylindrical lens is convex spherical.
4. optical devices as claimed in claim 2, it is characterized in that, described collimation lens (22) is the second cylindrical lens, the input surface of described second cylindrical lens is plane, the output surface of described second cylindrical lens is plane, and the refractive index of described second cylindrical lens is radially successively decreased according to parabola rule gradual change.
5. the optical devices as described in any one of claim 1-4, is characterized in that, diameter 2 ω of the focal beam spot of described condenser lens (3)
f, size 2 ω of collimated light beam
cformula is met with the focal distance f of described condenser lens (3)
λ is the wavelength of near infrared light or the wavelength of visible ray.
6. the optical devices as described in any one of claim 1-4, is characterized in that, the sweep velocity of described MEMS scanning mirror is greater than 25 frames per second.
7. a medical vein image instrument, comprises for near infrared light imaging, then by visible ray in-situ projection in the optical devices of object under test, it is characterized in that, described optical devices are the optical devices described in any one of claim 1-4.
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| EP3114512A4 (en) * | 2014-03-07 | 2017-10-25 | Gestion Valeo Societe En Commandite (Valeo Managem L.P.) | Mirror based microelectromechanical systems and methods |
| CN104027072B (en) * | 2014-06-04 | 2016-02-10 | 陕西科技大学 | A kind of scan-type vein blood vessel synchronous imaging and indicating device and method |
| CN104434033A (en) * | 2014-11-28 | 2015-03-25 | 深圳元华医疗设备技术有限公司 | Near-infrared angiography instrument |
| CN104880433B (en) * | 2015-06-09 | 2018-07-10 | 河南理工大学 | High-resolution MEMS micromirror infrared spectrometer based on off-axis parabolic mirror |
| CN106510629B (en) * | 2016-11-24 | 2023-07-14 | 中国科学院苏州生物医学工程技术研究所 | Blood vessel imaging instrument based on confocal |
| CN110095187A (en) * | 2019-05-17 | 2019-08-06 | 中北大学 | A kind of micro spectral imaging device based on the micro- galvanometer of MEMS and grating |
| CN112535450B (en) * | 2019-09-22 | 2022-11-08 | 深圳硅基智控科技有限公司 | Capsule endoscope with binocular ranging system |
| CN110854667A (en) * | 2019-12-04 | 2020-02-28 | 南京先进激光技术研究院 | Laser MEMS scanning projection module semiconductor laser debugging device |
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| CN1579323A (en) * | 2004-05-21 | 2005-02-16 | 天津大学 | Double-probe differential wavelength spectrometer for detecting tissue content and detection method |
| CN101539995A (en) * | 2009-04-24 | 2009-09-23 | 清华大学深圳研究生院 | Imaging device based on vein pattern and backside pattern of finger and multimode identity authentication method |
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| CN202511766U (en) * | 2011-12-06 | 2012-10-31 | 王刚 | Reflection-type multi-spectral common-path optical axis detecting device |
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