CN104535290A - Laser-induced fluorescence three-dimensional fluid detection system and method - Google Patents
Laser-induced fluorescence three-dimensional fluid detection system and method Download PDFInfo
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- CN104535290A CN104535290A CN201410842290.4A CN201410842290A CN104535290A CN 104535290 A CN104535290 A CN 104535290A CN 201410842290 A CN201410842290 A CN 201410842290A CN 104535290 A CN104535290 A CN 104535290A
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Abstract
The embodiment of the invention provides a laser-induced fluorescence three-dimensional fluid detection system and method. The detection system comprises a sheet-laser laser device, a lens group, a scanning device, an image collection device and an image processing device. The sheet-laser laser device outputs sheet lasers, the sheet lasers are collimated and expanded through the lens group so as to acquire sheet detection lasers, the scanning device is used for controlling the sheet detection lasers to scan a fluid sample containing fluorescent dye in a detection region at a preset speed, the scanning direction is perpendicular to the detection region incident direction of the sheet detection lasers, multiple two-dimensional fluorescence images acquired by irradiating the fluid sample with the sheet detection lasers are collected by the image collection device, three-dimensional reconstruction is conducted on the two-dimensional fluorescence images so as to acquire a three-dimensional scalar field in the detection region, and measurement of the three-dimensional scalar field of fluid is achieved.
Description
Technical field
The present invention relates to optical technical field, particularly relate to a kind of laser-induced fluorescence (LIF) three dimensional fluid detection system and detection method.
Background technology
Fluid mechanics is the mechanical motion rule of Study of Fluid (comprising liquids and gases) and the subject of application thereof, and the flow field related generally in fluid mechanics comprises scalar field and vector field.Common scalar field comprises temperature field and concentration field etc., and common vector field has velocity field etc.Flow measurement is again the important means in flow field in Study of Fluid mechanics.Much important flow phenomenon, such as: shock wave, boundary layer, wall are burst and large vortex stucture etc. is all found by flow measurement.For flow measurement, mainly comprise contact type measurement and non-contact measurement.Compared with contact type measurement, non-contact measurement can not produce disturbance to former flow field, is the important means of meticulous flow measurement especially turbulence modulation.
Laser-induced fluorescence (LIF) (Laser-lnduced Fluorescence, LIF) technology is a kind of contactless flow measurement technology conventional at present.Laser is irradiated on the fluid that is detected, when the energy of laser photon equals the energy difference in the molecule of certain component in the fluid be detected between two particular level, this molecule can the energy jump of absorbing laser photon to high-energy state.The molecule transitting to high-energy state is unstable, can return ground state from high-energy state very soon.Molecule returns the process of ground state from high-energy state, can produce spontaneous radiation and to release energy generation fluorescence.The fluorescence of the fluorescent material utilizing image capture device record to flow with the fluid be detected, what can realize complex flowfield is visual.LIF is mainly used in the flow measurement in water body flow field, can certainly be applied to the flow measurement in the flow field such as gas and plasma.
At present, laser-induced fluorescence (LIF) detection is main adopts PLIF technology, utilizes conventional linear laser instrument as light source, TEM
00the laser exported under pattern is Gaussian distribution laser, obtains fanning strip light source, be difficult to realize high-precision three-dimensional flow measurement by semicylindrical lens.
Summary of the invention
The technical matters that the present invention solves is to provide a kind of laser-induced fluorescence (LIF) three dimensional fluid detection system and detection method, the sheet detection light of required width is obtained after sheet laser beam expanding and collimation are exported to light sheets laser instrument, utilize scanning device to control sheet detection light to scan the detection sample in search coverage, solve the problem that cannot realize high-precision three-dimensional flow measurement in prior art.
For this reason, the technical scheme of technical solution problem of the present invention is:
A kind of laser-induced fluorescence (LIF) three dimensional fluid detection system, described system comprises:
Light sheets laser instrument, lens combination, scanning device, image capture device and image processing equipment;
Described light sheets laser instrument comprises multipoint mode semiconductor laser LD bar bar, and coupling mirror and resonator cavity, be provided with frequency-doubling crystal in described resonator cavity;
Described multipoint mode LD bar bar, as the pump light source of described light sheets laser instrument, exports the pump light of sheet; Described coupling mirror is by the coupling pump light of described sheet extremely described resonator cavity; The pump light of described sheet carries out exporting sheet laser after amplification and frequency multiplication through described resonator cavity;
Described lens combination obtains sheet detection light after expanding described sheet laser and collimate, by described sheet detection light output to described scanning device;
Described sheet detection light is reflexed to flowing sample search coverage by described scanning device, and be incident on the direction of search coverage perpendicular to described sheet detection light, controlling described sheet detection light and scanning according to the flowing sample of speed to described search coverage preset;
Described image capture device gathers several two-dimensional fluoroscopic image that the flowing sample gained of described search coverage is penetrated in described sheet detection illumination;
Described image processing equipment carries out to two-dimensional fluoroscopic image described in several three-dimensional detection result that three-dimensional reconstruction obtains the flowing sample of described search coverage.
Optionally, described light sheets laser instrument also comprises:
Shaping device, described shaping device is arranged between described multipoint mode LD bar bar and described coupling mirror;
Described shaping device receives the pump light of the sheet that described multipoint mode LD bar bar exports, and carries out shaping, to the sheet pump light of described coupling mirror output intensity homogenising to the pump light of described sheet.
Optionally, described lens combination comprises:
First sub-lens group of multiple spherical mirror composition and the second sub-lens group of multiple cylindrical mirror composition;
Described first sub-lens group is carried out 5 times to described sheet laser and is expanded;
The meridian direction of described second sub-lens group to described sheet laser realizes 10 times and expands.
Optionally, described scanning device comprises:
Three catoptrons, two motion guide rails, the slide block mated respectively with two motion guide rails and two drive motor;
Described first catoptron and the second catoptron are fixedly mounted on described first slide block, and described first skid is arranged on described first motion guide rail, and described first slide block can slide along described first motion guide rail under the driving of the first drive motor;
Described 3rd catoptron is fixedly mounted on described second slide block, and described second skid is arranged on described second motion guide rail, and described second slide block can slide along described second motion guide rail under the driving of the second drive motor;
Described first catoptron is mutually vertical with the second catoptron, described second catoptron and the mutual level of the 3rd catoptron, described first motion guide rail and described second guide rail parallel;
After sheet detection light is incident to described first catoptron, described sheet detection light is reflexed to described second catoptron by described first catoptron, described sheet detection light is reflexed to described 3rd catoptron by described second catoptron, and described sheet detection light is reflexed to described search coverage by described 3rd catoptron;
Under the driving of the second drive motor and the first drive motor, described second slide block and described first slide block synchronizing moving, and the translational speed of described first slide block is 1/2 of described second slide block, to make described sheet detect light, to reach the light path of search coverage identical, irradiates according to speed and the direction flowing sample to described search coverage preset to control described sheet detection light.
Optionally, described image processing equipment comprises:
Computing machine, video memory, controller and power supply;
Described computing machine is used for carrying out to two-dimensional fluoroscopic image described in several three-dimensional detection result that three-dimensional reconstruction obtains the flowing sample of described search coverage;
Described video memory is for storing two-dimensional fluoroscopic image described in several;
Described controller for control described scanning device and described image capture device and realize detecting and image acquisition synchronous;
Described power supply provides electric energy to the equipment in described system.
Optionally, described image capturing system comprises:
Complementary metal oxide semiconductor (CMOS) CMOS high speed camera or Charged Couple unit CCD high speed camera, described high speed camera is fixed on the 3rd slide block, in detection process, described 3rd slide block and described second slide block are with identical speed and direction synchronizing moving, constant to ensure the gathered two-dimensional fluoroscopic image depth of field.
Optionally, the wavelength of described light sheets laser instrument output sheet laser comprises:
473nm or 532nm.
Optionally,
The width of described sheet detection light is 0.5m.
A kind of laser-induced fluorescence (LIF) three dimensional fluid detection method, described method comprises:
Utilize laser-induced fluorescence (LIF) three dimensional fluid detection system of the present invention to detect the flowing sample of search coverage, specifically perform following steps:
Light sheets laser instrument exports sheet laser, and by described sheet Laser output to lens combination;
Described lens combination obtains sheet detection light after expanding described sheet laser and collimate, export described sheet sound-pipe to scanning device;
Described sheet detection light is reflexed to search coverage by described scanning device, and controls described sheet detection light and irradiate according to speed and the direction flowing sample to described search coverage preset;
Described image capture device gathers several two-dimensional fluoroscopic image that the flowing sample gained of described search coverage is penetrated in described sheet detection illumination;
Described image processing equipment carries out to two-dimensional fluoroscopic image described in several three-dimensional detection result that three-dimensional reconstruction obtains the flowing sample of described search coverage.
Optionally, described flowing sample comprises:
Current water containing fluorescent dye.
Known by technique scheme, the present invention has following beneficial effect:
Embodiments provide a kind of laser-induced fluorescence (LIF) three dimensional fluid detection system and detection method, described detection system comprises: light sheets laser instrument, lens combination, scanning device, image capture device and image processing equipment; Described light sheets laser instrument comprises multipoint mode semiconductor laser LD bar bar, and coupling mirror and resonator cavity, arrange frequency-doubling crystal in described resonator cavity; Described multipoint mode LD bar bar, as the pump light source of described light sheets laser instrument, exports the pump light of sheet; Described coupling mirror is by the coupling pump light of described sheet extremely described resonator cavity; The pump light of described sheet carries out exporting sheet laser after amplification and frequency multiplication through described resonator cavity; Described lens combination obtains sheet detection light after expanding described sheet laser and collimate, by described sheet detection light output to described scanning device; Described sheet detection light is reflexed to flowing sample search coverage by described scanning device, and be incident on the direction of search coverage perpendicular to described sheet detection light, controlling described sheet detection light and scanning according to the flowing sample of speed to described search coverage preset; Described image capture device gathers several two-dimensional fluoroscopic image that the flowing sample gained of described search coverage is penetrated in described sheet detection illumination; Described image processing equipment carries out to two-dimensional fluoroscopic image described in several three-dimensional detection result that three-dimensional reconstruction obtains the flowing sample of described search coverage.Light sheets laser instrument exports sheet laser, utilize lens combination to collimate sheet laser and expand and obtain sheet detection light, utilize scanning device to control described sheet detection light scanning according to the flowing sample of speed to described search coverage preset, image capture device gathers several two-dimensional fluoroscopic image detected, carry out to several two-dimensional fluoroscopic image the Three-dimensional calibration that three-dimensional reconstruction obtains the detection sample fluid in search coverage, the Three-dimensional calibration realizing convection cell is measured.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The laser-induced fluorescence (LIF) three dimensional fluid detection system structural representation that Fig. 1 provides for the embodiment of the present invention;
The light sheets laser instrument inner structure schematic diagram that Fig. 2 provides for the embodiment of the present invention;
The multipoint mode LD bar bar schematic diagram that Fig. 3 provides for the embodiment of the present invention;
The another kind of light sheets laser instrument inner structure schematic diagram that Fig. 4 provides for the embodiment of the present invention;
Fig. 5 is that the sheet pump light of described multipoint mode LD bar bar output is at plate-like optical waveguide shaping schematic diagram;
The light sheets laser structure schematic diagram that Fig. 6 provides for the embodiment of the present invention;
The structural representation of the described lens combination that Fig. 7 provides for the embodiment of the present invention;
The concrete structure schematic diagram of the scanning device that Fig. 8 provides for the embodiment of the present invention;
Fig. 9 be the embodiment of the present invention scanning device when carrying out scanning probe light path supplement principle schematic;
The image capture device structural representation that Figure 10 provides for the embodiment of the present invention;
The image processing equipment structural representation that Figure 11 provides for the embodiment of the present invention;
The another kind of image processing equipment structural representation that Figure 12 provides for the embodiment of the present invention;
Figure 13 is laser-induced fluorescence (LIF) three dimensional fluid detection system mounting finished product structural representation provided by the present invention;
The laser-induced fluorescence (LIF) three dimensional fluid detection method process flow diagram that Figure 14 provides for the embodiment of the present invention.
Embodiment
The embodiment of the present invention provides laser-induced fluorescence (LIF) three dimensional fluid detection system and detection system and method, sheet detection light is obtained after sheet laser beam expanding and collimation are exported to light sheets laser instrument, utilize scanning device to control sheet detection light to scan the detection sample in search coverage, to the three-dimensional detection of the detection sample in search coverage, realize measuring the scalar field of three dimensional fluid.
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described in detail.
The laser-induced fluorescence (LIF) three dimensional fluid detection system structural representation that Fig. 1 provides for the embodiment of the present invention, comprising:
Light sheets laser instrument 101, lens combination 102, scanning device 103, image capture device 104 and image processing equipment 105.
The light sheets laser instrument inner structure schematic diagram that Fig. 2 provides for the embodiment of the present invention, described light sheets laser instrument 101 comprises: multipoint mode semiconductor laser LD bar bar 201, coupling mirror 202 and resonator cavity 203, be provided with frequency-doubling crystal 204 in described resonator cavity.
Described multipoint mode LD bar bar 201, as the pump light source of described light sheets laser instrument 101, exports the pump light of sheet; Described coupling mirror 202 is by the coupling pump light of described sheet extremely described resonator cavity 203; The pump light of described sheet exports sheet laser after described resonator cavity 203 carries out amplification and frequency multiplication.
Described light sheets laser instrument adopts multipoint mode LD bar bar as optical pumping, described multipoint mode LD bar bar is that multiple LD bar bar is evenly arranged in the form of an array, each LD bar bar exports beam of laser, and multipoint mode LD bar bar can export multiple laser as pump light simultaneously.Because the interval between each LD bar bar is smaller, the laser that each LD bar bar exports has certain angle of divergence, as long as the interval arranged between every two LD bar bars meets formula (1), when ensureing to be incident to coupling mirror 202, every Shu Jiguang overlaps each other, and forms sheet pump light.
Δx＜0.5Ltgθ (1)；
Wherein, Δ x is the interval between every two LD bar bars, and L is the distance of multipoint mode LD bar bar 201 apart from described coupling mirror 202, and θ is the angle of divergence of the laser that each LD bar bar exports.
The multipoint mode LD bar bar schematic diagram that Fig. 3 provides for the embodiment of the present invention, the number of LD bar bar in multipoint mode LD bar bar can be set according to actual needs, interval in multipoint mode LD bar bar 101 between each LDbar bar meets formula (1), when the multiple laser that then multipoint mode LD bar bar 101 exports is incident to described coupling mirror 202, as shown in Figure 3, coupling mirror 202 can receive the sheet pump light with one fixed width.When specific implementation, multipoint mode LD Bar bar can arrange 19 LD Bar bars, and can obtain width L is 10mm, and thickness d is the luminous size of 50 μm.
As shown in Figure 4, in a specific embodiment, described light sheets laser instrument 101 also comprises:
Shaping device 401, described shaping device 401 is arranged between described multipoint mode LD bar bar 201 and described coupling mirror 202;
Described shaping device 401 receives the pump light of the sheet that described multipoint mode LD bar bar exports, and carries out shaping, to the sheet pump light of described coupling mirror output intensity homogenising to the pump light of described sheet.
Conventional laser TEM
00the laser of the Gaussian distribution exported under pattern, when expanding the fan-shaped sheet laser of rear acquisition as light source by optical device, owing to there is horizontal Intensity of Gaussian distribution and longitudinal light intensity attenuation, cause measurement range little (10cm magnitude), precision is low, cannot realize on a large scale (50cm magnitude), the flow measurement of high accuracy three-dimensional scalar field.
Therefore, between described multipoint mode LD bar bar 201 and described coupling mirror 202, arrange a shaping device 401, described shaping device 205 carries out shaping for the sheet pump light exported described multipoint mode LD bar bar 201.As shown in Figure 3, described multipoint mode LD bar bar exports multiple laser, every Shu Jiguang is Gaussian distribution, uneven to edge light distribution by center, the center light intensity of every Shu Jiguang is stronger, the edge divergence part light intensity of every Shu Jiguang is more weak, i.e. light intensity difference is larger everywhere for the sheet pump light of multipoint mode LD bar bar 201 output.Uniform sheet pump light is exported in order to make light sheets laser instrument 101, shaping device 401 is adopted to carry out shaping to the sheet pump light that described multipoint mode LD bar bar 201 exports, every bar light beam in sheet pump light is repeatedly launched entirely in described shaping device 401 inside, the uniform sheet pump light of described shaping device output intensity.During specific implementation, described shaping device 401 is plate-like optical waveguide.Fig. 5 be described multipoint mode LD bar bar 201 export sheet pump light at plate-like optical waveguide shaping schematic diagram, multipoint mode LD bar bar 201 export sheet pump light in plate-like optical waveguide after multiple total reflection shaping, export uniform sheet pump light.
Described coupling mirror 202, for the sheet coupling pump light extremely described resonator cavity 203 exported by multipoint mode LD bar bar.Certainly, if be provided with shaping device 401 between described multipoint mode LD bar bar and described coupling mirror 202, then the uniform sheet coupling pump light extremely described resonator cavity 203 of described coupling mirror 202 for described shaping device 401 is exported.
Frequency-doubling crystal 204 is provided with, for amplifying the pump light of described sheet and exporting sheet laser after frequency multiplication in described resonator cavity 203.Resonator cavity 203 has and a variety ofly possible realizes structure, provide in Fig. 6 a kind of resonator cavity 203 concrete realize structure.Light sheets laser instrument 101 structural representation that Fig. 6 provides for the embodiment of the present invention.In Fig. 6, described light sheets laser instrument comprises multipoint mode LD bar bar 201, shaping device 401, coupling mirror 202 and resonator cavity 203.Described resonator cavity 203 comprises gain media 601, frequency-doubling crystal 602 and catoptron 603.Wherein, the left side of described gain media 601 is as a minute surface of described resonator cavity 203, and described catoptron 603 is as another minute surface of described resonator cavity 203.The uniform sheet pump light that coupling mirror 202 exports amplifies and exports uniform sheet laser after frequency multiplication in described resonator cavity 203.
Light sheets laser instrument 101 provided by the present invention can export the sheet laser of different wave length, only need the wavelength that the multipoint mode LD bar bar arranged as required exports, gain media in resonator cavity and frequency-doubling crystal are set, the sheet laser of required wavelength can be obtained.
Provide two kinds of concrete examples below:
Described light sheets laser instrument 101 output wavelength is the sheet laser of 532nm, may be used for the temperature field of detection of three dimensional current water.Wherein, multipoint mode LD bar bar exports the sheet pump light of 808nm, adopt Nd-doped yttrium vanadate (Nd:YVO4) crystal as gain media in resonator cavity 203, sheet pump light produces population inversion in described Nd:YVO4 crystal, obtains the fundamental frequency light of 1064nm.Described resonator cavity 203 adopts the period polarized magnesium oxide doped lithium niobate crystal (MgO:PPLN) of bar shaped as frequency-doubling crystal, the fundamental frequency light of the 1062nm that described gain media Nd:YVO4 crystal exports, after MgO:PPLN crystal double frequency, obtains the sheet laser of green 532nm.
Described light sheets laser instrument 101 output wavelength is the sheet laser of 473nm, may be used for the concentration field of detection of three dimensional current water.Wherein, multipoint mode LD bar bar exports the sheet pump light of 808nm, adopt neodymium-doped yttrium-aluminum garnet (Nd:YAG) crystal as gain media in resonator cavity 203, sheet pump light produces population inversion in described Nd:YAG crystal, obtains the fundamental frequency light of 946nm.Described resonator cavity 203 adopts the period polarized magnesium oxide doped lithium niobate crystal (MgO:PPLN) of bar shaped as frequency-doubling crystal, the fundamental frequency light of the 946nm that described gain media Nd:YAG crystal exports, after MgO:PPLN crystal double frequency, obtains the sheet laser of blue 473nm.
By optimizing the optical parametric of resonator cavity 203 described in light sheets laser instrument 101, control crystal temperature effect in described resonator cavity, described light sheets laser instrument 101 output power can be greater than 2W, uniform green or blue sheet laser.It is 10mm that the sheet laser exported is of a size of width L, and thickness d is the 0.3mm. angle of divergence is 3mrad.
Described lens combination 102 obtains sheet detection light after expanding described sheet laser and collimate, by described sheet detection light output to described scanning device 103.
Described lens combination 102 comprises the first sub-lens group of multiple spherical mirror composition and the second sub-lens group of multiple cylindrical mirror composition;
Described first sub-lens group is carried out 5 times to described sheet laser and is expanded;
The meridian direction of described second sub-lens group to described sheet laser realizes 10 times and expands.
The described lens combination of one 102 structural representation in the cards that Fig. 7 provides for the embodiment of the present invention, described lens combination 102 comprises the first sub-lens group of three spherical mirrors 701,702 and 703 composition and the second sub-lens group of three cylindrical mirror 704,705 and 706 compositions.
Described lens combination 102 expands than there being very big-difference at meridian direction and sagitta of arc direction, and described lens combination 102 expands light path as shown in Figure 7.Described lens combination 102 adopts secondary to expand, and the first sub-lens group of three spherical mirror compositions, as one-level extender lens group, realizes 5 times and expands; Second sub-lens group of three cylindrical mirror compositions, as secondary extender lens group, realizes 10 times and expands.Second sub-lens group only realizes 10 times to described sheet laser and expands on meridian direction.The sheet detection of photons noon direction realizing expanding and collimating rear gained is of a size of 1.1mm, and beam divergence angle is 0.8mrad; Sagitta of arc direction is of a size of 500mm, and emission angle is less than 1mrad.Wherein, described meridian direction refers to the thickness d of sheet detection light, and described sagitta of arc direction refers to the width L of sheet detection light.
In the collimation design of described lens combination 102, the homogeneity of heavy caliber collimated light beam is main design difficulty.In the process optimizing beam uniformity, the residual distortion of camera lens is optimized to barrel distortion, effectively can eliminates the unevenness of lens edge light, ensure that illuminance uniformity is greater than 90%.Fig. 8 adopts lens combination to the homogeneity simulated effect figure after 532nm wavelength sheet laser alignment; Fig. 9 adopts lens combination to the homogeneity simulated effect figure after 473nm wavelength sheet laser alignment.
The design expanding and collimate due to described lens combination 102 adopts two telecentric beam path, so insensitive to measurement target position, in telecentric beam path in image space, the nonparallelism of critical alignment different visual fields chief ray, can reach good design effect.
Described sheet detection light is reflexed to flowing sample search coverage by described scanning device 103, and be incident on the direction of search coverage perpendicular to described sheet detection light, controlling described sheet detection light and scanning according to the flowing sample of speed to described search coverage preset.
Described scanning device 103 is for realizing three-dimensional detection, and described scanning device 103 controls described sheet detection light and scans according to the speed preset in the plane perpendicular to described sheet detection light place.Due to the very thin thickness of sheet detection light, very little compared with width, sheet can be detected light and be similar to the detection light regarding two dimension as.When sheet detection light scans according to the speed preset in the plane perpendicular to sheet detection light place, can realize carrying out three-dimensional detection to the detection sample in search coverage.
Shown scanning device 103 can comprise a drive motor, a motion guide rail, a slide block mated with described motion guide rail, and described slide block arranges a catoptron.The sheet detection light that described lens combination 102 exports incides on the catoptron of described slide block, and described sheet detection light is reflexed to search coverage by described catoptron.Described drive motor controls described slide block and moves according to the speed preset on described motion guide rail, and the direction of described slide block movement and described sheet detect the plane orthogonal at light place.Described catoptron moves according to the speed preset along with slide block, changes catoptron and sheet is detected the position that light reflexes to search coverage, thus realize the 3-D scanning to search coverage.Because light sheets laser instrument and described lens group position are fixed, should not be arranged on the motion guide rail of high-speed motion, therefore, when drive motor drives slide block to make the position of described catoptron change, the light path that described catoptron reflexes to the sheet detection light of search coverage is different from each other, the light path of sheet detection detection light is different, can affect the light intensity of sheet detection light, can affect the accuracy of result of detection.
Due to the impact that the light path difference of sheet detection light is brought to result of detection in the process of scanning probe, embodiments provide another kind of scanning device.The concrete structure schematic diagram of a kind of scanning device that Fig. 8 provides for the embodiment of the present invention, shown scanning device 103 comprises:
Three catoptrons 801,802 and 803, two motion guide rails 804 and 805, the slide block 806 and 807 mated respectively with two motion guide rails and two drive motor 808 and 809.
Described first catoptron 801 and the second catoptron 802 are fixedly mounted on described first slide block 806, described first slide block 806 is slidably mounted on described first motion guide rail 804, and described first slide block 806 can slide along described first motion guide rail 804 under the driving of the first drive motor 808.
When first slide block 806 slides along described first motion guide rail 804, the first catoptron 801 and the second catoptron 802 also move along with the slip of the first slide block 806.
Described 3rd catoptron 803 is fixedly mounted on described second slide block 805, described second slide block 805 is slidably mounted on described second motion guide rail 807, and described second slide block 807 can slide along described second motion guide rail 805 under the driving of the second drive motor 809.
When second slide block 807 slides along described second motion guide rail 805, the 3rd catoptron 803 also moves along with the slip of the second slide block 807.The vertical sheet reflected with described 3rd catoptron in the direction that second slide block 807 slides detects the plane at light place, realizes sheet detection light to the 3-D scanning of search coverage.
Described first catoptron 801 is mutually vertical with the second catoptron 802, described second catoptron 802 and the 3rd catoptron 803 level, described first motion guide rail 804 and described second motion guide rail parallel 805 mutually.
After sheet detection light is incident to described first catoptron 801, described sheet detection light is reflexed to described second catoptron 802 by described first catoptron 801, described sheet detection light is reflexed to described 3rd catoptron 803 by described second catoptron 802, and described sheet detection light is reflexed to described search coverage by described 3rd catoptron 803.
Under the driving of the second drive motor 809 and the first drive motor 808, described second slide block and described first slide block synchronizing moving, and the translational speed of described first slide block is 1/2 of described second slide block, to make described sheet detect light, to reach the light path of search coverage identical, irradiates according to speed and the direction flowing sample to described search coverage preset to control described sheet detection light.
In scanning device 103, the first drive motor 808 drives the first slide block 806 to move L/2 at the first motion guide rail 804, and the first catoptron 801 accordingly on the first motion guide rail 804 and the second catoptron 802 move L/2 relative to original position.Second drive motor 809 drives the second slide block 807 to move L in the same direction at the second motion guide rail 805, and the 3rd catoptron 803 accordingly on the second motion guide rail moves L relative to original position, and namely the length of search coverage is crossed in sheet detection photoscanning is L.The first drive motor 808 is adopted to drive the first slide block 806 to move L/2 in order that when scanning diverse location at the first motion guide rail 804, the light path Different Effects result of detection of sheet detection light.When adopting the scanning device 103 shown in Fig. 8 to carry out scanning probe, light path compensation principle as shown in Figure 9.
Wherein, described first drive motor 808 and described second drive motor 809 are U-shaped linear electric motors.
Described image capture device 104 gathers several two-dimensional fluoroscopic image that the flowing sample gained of described search coverage is penetrated in described sheet detection illumination.
The image capture device structural representation that Figure 10 provides for the embodiment of the present invention, described image capture device 104 comprises: high speed camera 1001, the 3rd motion guide rail 1002, the 3rd slide block the 1003, three drive motor 1004 mated with described 3rd motion guide rail.Described high speed camera 1001 is fixedly mounted on described 3rd slide block 1003, and described 3rd slide block 1003, under the driving of described 3rd drive motor 1004, slides along described 3rd motion guide rail 1002.In detection process, described 3rd slide block and described second slide block are with identical speed and direction synchronizing moving, constant to ensure the gathered two-dimensional fluoroscopic image depth of field.Described high speed camera 1001 can be complementary metal oxide semiconductor (CMOS) CMOS high speed camera or Charged Couple unit CCD high speed camera.Further, the height adjustable of described high speed camera 1001.Wherein, described 3rd drive motor is also U-shaped linear electric motors.Described image capture device 104 penetrates several two-dimensional fluoroscopic image of the flowing sample gained of described search coverage for sheet detection illumination described in high speed acquisition.Image capture device 104 gathers the two-dimensional fluoroscopic image produced when the diverse location of search coverage is penetrated in sheet detection illumination.The two-dimensional fluoroscopic image that diverse location gained is penetrated in several sheets detection illumination is carried out three-dimensionalreconstruction, the result of detection of search coverage three-dimensional flow field can be obtained, realize the detection in concentration field to three-dimensional flow field and temperature field.
Described image processing equipment 105 carries out to two-dimensional fluoroscopic image described in several three-dimensional detection result that three-dimensional reconstruction obtains the flowing sample of described search coverage.
As shown in figure 11, described image processing equipment comprises: computing machine 1101, video memory 1102, controller 1103 and power supply 1104.
Described computing machine 1101 is for carrying out the three-dimensional detection result that three-dimensional reconstruction obtains the flowing sample of described search coverage to two-dimensional fluoroscopic image described in several.
Computing machine mainly realizes carrying out three-dimensional reconstruction to several two-dimensional fluoroscopic image, and the method for 3-dimensional reconstruction has a lot, is not restricted here, and the method for any one 3-dimensional reconstruction can be adopted to realize.
Described video memory 1102 is for storing two-dimensional fluoroscopic image described in several.
Video memory 1102, stores several two-dimensional fluoroscopic image, and when the storage space shared by several two-dimensional fluoroscopic image is less, described video memory 1102 can be the storage space in computing machine; When the storage space shared by several two-dimensional fluoroscopic image is very large, the memory device that described video memory 1102 can adopt hard disk etc. independent.
Described controller 1103 for control described scanning device and described image capture device and realize detecting and image acquisition synchronous.
Described controller 1103 is for giving the first drive motor 808 and the second drive motor 809 in described scanning device 103, and the 3rd drive motor 1004 in described image capture device 104 transmits control signal, the sheet detection photodetection in gated sweep equipment 103 and image capture device 104 and image acquisition synchronous.Controller 1103 transmits control signal to the first drive motor 808, control the first slide block 806 to slide on the first motion guide rail 804, controller 1103 transmits control signal to the second drive motor 809, control the second slide block 807 to slide on the second motion guide rail 805, thus the side that control sheet detection light is penetrating search coverage perpendicular to described sheet detection illumination moves up, simultaneously, controller 1103 transmits control signal to the 3rd drive motor 1004, control the 3rd slide block 1003 to slide on the second motion guide rail 1002, control high speed camera 1001 to move, when ensureing that high speed camera 1001 gathers the two-dimensional fluoroscopic image on search coverage diverse location, relative distance between the position that high speed camera 1001 and sheet detect light-struck search coverage is constant.
Described power supply 1104 provides electric energy to the equipment in described system.
In one embodiment, described system also comprises a rack, and as shown in figure 12, described rack is for placing the equipment such as computing machine, video memory, controller and power supply.
Figure 13 is laser-induced fluorescence (LIF) three dimensional fluid detection system mounting finished product structural representation provided by the present invention, Figure 13 just provides all devices wherein a kind of assembling mode in described laser-induced fluorescence (LIF) three dimensional fluid detection system, other assembling mode can also be adopted, save space as far as possible.
The laser-induced fluorescence (LIF) three dimensional fluid detection method process flow diagram that Figure 14 provides for the embodiment of the present invention, described method comprises:
The flowing sample of the laser-induced fluorescence (LIF) three dimensional fluid detection system detection search coverage utilizing the embodiment of the present invention to provide, specifically performs following steps:
Step 1401: light sheets laser instrument exports sheet laser, and by described sheet Laser output to lens combination.
Step 1402: described lens combination obtains sheet detection light after expanding described sheet laser and collimate, export described sheet sound-pipe to scanning device.
Step 1403: described sheet detection light is reflexed to search coverage by described scanning device, and control described sheet detection light and irradiate according to speed and the direction flowing sample to described search coverage preset.
Step 1404: described image capture device and scanning device synchronizing moving, and several two-dimensional fluoroscopic image gathering that sheet detection illumination jet moves sample gained.
Step 1405: described image processing equipment carries out to two-dimensional fluoroscopic image described in several three-dimensional detection result that three-dimensional reconstruction obtains the flowing sample of described search coverage.
Laser-induced fluorescence (LIF) three dimensional fluid detection system provided by the present invention is mainly used in the concentration field and the temperature field that detect current water.Method described in Figure 14 is and the detection method corresponding to the laser-induced fluorescence (LIF) three dimensional fluid detection system described in the embodiment of the present invention, concrete methods of realizing, with reference to the description to laser-induced fluorescence (LIF) three dimensional fluid detection system in the embodiment of the present invention, repeats no more here.
Laser-induced fluorescence (LIF) three dimensional fluid detection system provided by the present invention and method, have following significance to the detection of current water:
Strategic: to meet national energy exploitation, water resource utilizes and the Major Strategic Demand of water prevention and cure of pollution.National Program for Medium-to Long-term Scientific and Technological Development (2006-2020; hereinafter referred to as outline) by " energy, water and mineral resources, environment " as following national science and technology three major fields, using " water resource optimal allocation and comprehensive development and utilization ", " comprehensive anti-pollution and recycling waste ", " marine ecology and environmental protection " as three pioneer fields.Wherein, " water resource optimal allocation and comprehensive development and utilization " pioneer field, primary study develops shifting to new management mechanisms and distributing technology rationally of atmospheric water, surface water, the holard and underground water, sewage, rain-flood resource system utilize technology, increase rain artificially technology, the great rivers comprehensive regulation such as the Changjiang river, the Yellow River and the south water to north etc. are across the gordian technique etc. of the great hydraulic engineering harness and development in basin." water pollution Control and treatment " lists one of country's 16 major scientific and technological projects in.Fundamental research towards great strategy demand towards the country has been listed in " key scientific problems in energy sustainable development " and " the great mechanics problem of Aero-Space ".These fields are above all this project equipment " ample scopes for abilities ".
Practicality: at energy field, as in three gorges project construction, high-velocity flow, dissipation and scouring are the key technical problems of Dam Designs in Last.In all thermoelectricitys and nuclear power station design, the discharge of chilled water is related to power station addressing, is also related to the impact on environment.In the design of these Important Project, usually need to carry out physical experiments determination designing parameters, FLOW VISUALIZATION is measured and temperature field takes traditional point to measure or contact type measurement usually, and contactless 3DLIF technology has wide practical use.Tackled key problems by interdiscipline, improve sheet laser system, overcome the bottleneck of conventional P LIF technology main application space small scale scope scientific research demand, make a breakthrough in the production practical problems solving large scale scope.In water prevention and cure of pollution field, the analogue measurement of disposal of pollutants is key and the difficult point of formulating disposal of pollutants technical standard.3DLIF commercial measurement three-dimensional concentration field, can contaminated solution discharge in laboratory simulation and measure this technical barrier.
Urgency: meet the very important decision that development has the high end fluid measuring equipment of independent intellectual property right.China, in the development of fluid measuring apparatus, is in relatively backward status always.Except some miniature fluid measuring equipments, the fluid measuring apparatus of middle and high end is mainly all monopolized by external major company.A lot of scientific research institution, in concrete research and production, also carry out the equipment research and development that some meet research and production demand, but be often in the development stage of principle prototype and local improvement, be not converted into that there is independent intellectual property right, complete fluid measuring apparatus productive capacity.Much important fundamental research (as turbulent flow and combustion process) and Important Project (as hydroelectric project and Aerospace Engineering), all need carry out a large amount of laboratory simulation experiments and measure, optimizing process designs.Therefore, there is the high-end imaging measurement equipment of complete independent intellectual property right in the urgent need to research and development, improve China's capability of independent innovation.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a laser-induced fluorescence (LIF) three dimensional fluid detection system, is characterized in that, described system comprises:
Light sheets laser instrument, lens combination, scanning device, image capture device and image processing equipment;
Described light sheets laser instrument comprises multipoint mode semiconductor laser LD bar bar, and coupling mirror and resonator cavity, be provided with frequency-doubling crystal in described resonator cavity;
Described multipoint mode LD bar bar, as the pump light source of described light sheets laser instrument, exports the pump light of sheet; Described coupling mirror is by the coupling pump light of described sheet extremely described resonator cavity; The pump light of described sheet carries out exporting sheet laser after amplification and frequency multiplication through described resonator cavity;
Described lens combination obtains sheet detection light after expanding described sheet laser and collimate, by described sheet detection light output to described scanning device;
Described sheet detection light is reflexed to flowing sample search coverage by described scanning device, and be incident on the direction of search coverage perpendicular to described sheet detection light, controlling described sheet detection light and scanning according to the flowing sample of speed to described search coverage preset;
Described image capture device gathers several two-dimensional fluoroscopic image that the flowing sample gained of described search coverage is penetrated in described sheet detection illumination;
Described image processing equipment carries out to two-dimensional fluoroscopic image described in several three-dimensional detection result that three-dimensional reconstruction obtains the flowing sample of described search coverage.
2. system according to claim 1, is characterized in that, described light sheets laser instrument also comprises:
Shaping device, described shaping device is arranged between described multipoint mode LD bar bar and described coupling mirror;
Described shaping device receives the pump light of the sheet that described multipoint mode LD bar bar exports, and carries out shaping, to the sheet pump light of described coupling mirror output intensity homogenising to the pump light of described sheet.
3. system according to claim 1, is characterized in that, described lens combination comprises:
First sub-lens group of multiple spherical mirror composition and the second sub-lens group of multiple cylindrical mirror composition;
Described first sub-lens group is carried out 5 times to described sheet laser and is expanded;
The meridian direction of described second sub-lens group to described sheet laser realizes 10 times and expands.
4. system according to claim 1, is characterized in that, described scanning device comprises:
Three catoptrons, two motion guide rails, the slide block mated respectively with two motion guide rails and two drive motor;
Described first catoptron and the second catoptron are fixedly mounted on described first slide block, and described first skid is arranged on described first motion guide rail, and described first slide block can slide along described first motion guide rail under the driving of the first drive motor;
Described 3rd catoptron is fixedly mounted on described second slide block, and described second skid is arranged on described second motion guide rail, and described second slide block can slide along described second motion guide rail under the driving of the second drive motor;
Described first catoptron is mutually vertical with the second catoptron, described second catoptron and the mutual level of the 3rd catoptron, described first motion guide rail and described second guide rail parallel;
After sheet detection light is incident to described first catoptron, described sheet detection light is reflexed to described second catoptron by described first catoptron, described sheet detection light is reflexed to described 3rd catoptron by described second catoptron, and described sheet detection light is reflexed to described search coverage by described 3rd catoptron;
Under the driving of the second drive motor and the first drive motor, described second slide block and described first slide block synchronizing moving, and the translational speed of described first slide block is 1/2 of described second slide block, to make described sheet detect light, to reach the light path of search coverage identical, irradiates according to speed and the direction flowing sample to described search coverage preset to control described sheet detection light.
5. system according to claim 1, is characterized in that, described image processing equipment comprises:
Computing machine, video memory, controller and power supply;
Described computing machine is used for carrying out to two-dimensional fluoroscopic image described in several three-dimensional detection result that three-dimensional reconstruction obtains the flowing sample of described search coverage;
Described video memory is for storing two-dimensional fluoroscopic image described in several;
Described controller for control described scanning device and described image capture device and realize detecting and image acquisition synchronous;
Described power supply provides electric energy to the equipment in described system.
6. the system according to claim 1-5 any one, is characterized in that, described image capturing system comprises:
Complementary metal oxide semiconductor (CMOS) CMOS high speed camera or Charged Couple unit CCD high speed camera, described high speed camera is fixed on the 3rd slide block, in detection process, described 3rd slide block and described second slide block are with identical speed and direction synchronizing moving, and the two-dimensional fluoroscopic image depth of field that maintenance gathers is constant to get a distinct image.
7. the system according to claim 1-5 any one, is characterized in that, the wavelength that described light sheets laser instrument exports sheet laser comprises:
473nm or 532nm.
8. the system according to claim 1-5 any one, is characterized in that,
The width of described sheet detection light is 0.5m.
9. a laser-induced fluorescence (LIF) three dimensional fluid detection method, is characterized in that, described method comprises:
Utilize the flowing sample of the laser-induced fluorescence (LIF) three dimensional fluid detection system detection search coverage described in claim 1-8 any one, specifically perform following steps:
Light sheets laser instrument exports sheet laser, and by described sheet Laser output to lens combination;
Described lens combination obtains sheet detection light after expanding described sheet laser and collimate, export described sheet sound-pipe to scanning device;
Described sheet detection light is reflexed to search coverage by described scanning device, and controls described sheet detection light and irradiate according to speed and the direction flowing sample to described search coverage preset;
Described image capture device gathers several two-dimensional fluoroscopic image that the flowing sample gained of described search coverage is penetrated in described sheet detection illumination;
Described image processing equipment carries out to two-dimensional fluoroscopic image described in several three-dimensional detection result that three-dimensional reconstruction obtains the flowing sample of described search coverage.
10. method according to claim 9, is characterized in that, described flowing sample comprises:
Current water containing fluorescent dye.
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