CN111025518B - Particle field holographic 4F imaging device based on filtering - Google Patents
Particle field holographic 4F imaging device based on filtering Download PDFInfo
- Publication number
- CN111025518B CN111025518B CN201911386157.1A CN201911386157A CN111025518B CN 111025518 B CN111025518 B CN 111025518B CN 201911386157 A CN201911386157 A CN 201911386157A CN 111025518 B CN111025518 B CN 111025518B
- Authority
- CN
- China
- Prior art keywords
- vacuum
- lens group
- filter
- sleeve
- cover plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002245 particle Substances 0.000 title claims abstract description 48
- 238000003384 imaging method Methods 0.000 title claims abstract description 47
- 238000001914 filtration Methods 0.000 title claims abstract description 43
- 239000011521 glass Substances 0.000 claims abstract description 85
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 238000001093 holography Methods 0.000 claims abstract description 8
- 230000005499 meniscus Effects 0.000 claims description 30
- 239000000919 ceramic Substances 0.000 claims description 21
- 239000000758 substrate Substances 0.000 claims description 14
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 description 7
- 238000001454 recorded image Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/006—Filter holders
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/0005—Adaptation of holography to specific applications
- G03H2001/0033—Adaptation of holography to specific applications in hologrammetry for measuring or analysing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Holo Graphy (AREA)
Abstract
The invention relates to a particle field holography 4F imaging device, in particular to a particle field holography 4F imaging device based on filtering, which solves the problems that when the existing 4F imaging device based on filtering is adopted for measurement, high-precision adjustment is difficult, imaging quality is low, and when a front lens group, a rear lens group and the filtering device are integrated, the filtering device cannot be replaced in different application scenes. The device comprises a front lens group and a rear lens group; it is characterized in that: the vacuum assembly is positioned between the front lens group and the rear lens group and is fixedly connected with the front lens group and the rear lens group; the vacuum assembly comprises a vacuum assembly sleeve, a filtering device, a first vacuum valve and a second vacuum valve which are arranged on the vacuum assembly sleeve, and a front vacuum sealing window and a rear vacuum sealing window which are respectively covered on the front end surface and the rear end surface of the vacuum assembly sleeve; the wall of the sleeve of the vacuum component is provided with a through hole; the filter glass is inserted into the inner cavity of the vacuum assembly sleeve from the through hole and then is coaxially arranged with the vacuum assembly sleeve; the filtering device is detachably connected with the vacuum assembly sleeve in a sealing mode.
Description
Technical Field
The invention relates to a particle field holography 4F imaging device, in particular to a particle field holography 4F imaging device based on filtering.
Background
The particle field holographic diagnostic technology can obtain three-dimensional quantitative information of the size, the speed, the spatial distribution and the like of small particles in a particle field, has the characteristics of non-contact, high precision, large test space and the like, and is one of standard methods for particle field measurement. Particle field measurement usually adopts two recording modes of coaxial and off-axis; in practical application, when measuring micron-sized small particles, a 4F imaging device is generally adopted in a recording system; in this way, on the one hand, the security of the recording medium can be ensured, and on the other hand, the recording requirements of far-field distances can be met.
When the density of the measured particle field is high, in order to ensure the signal-to-noise ratio of the recorded image and reduce the resolution requirement on the recording medium, a divergent light recording mode or a filtering technology is generally adopted for realizing. The divergent light recording mode adopts a divergent light source, a 4F imaging device is cancelled, the distance between a particle field and a recording medium is increased, the distance between interference fringes reaching the recording medium is enlarged, and the requirement of reducing the resolution of the recording medium is met; but the intensity of scattered light of particles reaching the recording medium is significantly reduced, resulting in a reduction in the contrast of interference fringes; meanwhile, the increase of the distance between the interference fringes leads to the serious overlap between the interference fringes corresponding to the particle dense area, and the test precision of the area is reduced. The filtering technique increases the intensity of high-frequency light by blocking a straight light-transmitting portion of object light that does not pass through particles by placing a filter between lenses in a 4F imaging device to improve the signal-to-noise ratio of a recorded image. In practical applications, filtering techniques are mostly used.
There are two configurations of filter-based 4F imaging devices currently described in the literature for particle field measurements: a front and back two groups of lens groups forming a 4F imaging device are mutually separated, the optical axes of the two groups of lens groups form an angle of 90 degrees, a plane reflector with a through hole at the center of a mirror surface is placed on the focal plane of the lens group, the part of the straight light transmission part is focused to the through hole and is emitted out of an imaging light path through the through hole, and therefore the purpose of eliminating the straight light transmission without particle scattering is achieved; the structure has the defects that the requirement on the matching adjustment between the focal points of the front lens group and the rear lens group in the 4F imaging device and the focal points of the front lens group and the rear lens group, the plane of the reflector and the through hole is high, the light path is difficult to adjust, and the quality of object light can be interfered by halation generated by air breakdown at the high-energy short pulse laser focal point. The other is that the front and the back lens groups share the same optical axis, a filter is additionally arranged at the 4F focal plane, and the filter generally adopts a glass substrate with a non-light-transmitting film plated at the center to block the direct light transmission without particle scattering at the focal point; the structure reduces the adjusting difficulty to a certain extent; however, the following disadvantages still exist:
(1) when the lens is measured in different scenes, the problem of difficult high-precision adjustment exists due to the matching of the front and rear groups of lens groups and the filter;
(2) the glass substrate in the added filter is not integrally designed as a part of the 4F imaging device, so that certain aberration is caused, and the imaging quality of the 4F imaging device is reduced;
(3) if the front lens group, the rear lens group and the filter are integrated into a whole imaging device at high precision, the problem that the filter cannot be replaced in different application scenes is faced.
Disclosure of Invention
The invention aims to provide a particle field holographic 4F imaging device based on filtering, which aims to solve the technical problems that when the existing filtering-based 4F imaging device is used for measurement, high-precision adjustment is difficult, the imaging quality is low, and when a front lens group, a rear lens group and the filtering device are integrated, the filtering device cannot be replaced in different application scenes.
The technical scheme adopted by the invention is that the particle field holographic 4F imaging device based on filtering comprises a front lens group and a rear lens group; it is characterized in that:
also includes a vacuum assembly;
the vacuum assembly comprises a vacuum assembly sleeve, a filtering device, a first vacuum valve, a second vacuum valve, a front vacuum sealing window and a rear vacuum sealing window;
the wall of the vacuum component sleeve barrel is provided with a through hole;
the filter device comprises filter glass; the filter glass is inserted into the inner cavity of the vacuum assembly sleeve from the through hole, is coaxially arranged with the vacuum assembly sleeve, and is divided into a front cavity and a rear cavity by the filter glass; the filter plane of the filter glass is positioned on one side of the front cavity; the filtering device is detachably connected with the vacuum assembly sleeve in a sealing manner;
the first vacuum valve and the second vacuum valve are both arranged on the vacuum assembly sleeve, and one end of the first vacuum valve and one end of the second vacuum valve are both communicated with the front cavity and the rear cavity simultaneously; the other end of the first vacuum valve is used for connecting a vacuum pump; the other end of the second vacuum valve is used for connecting a vacuum gauge pipe;
the front vacuum sealing window and the rear vacuum sealing window are respectively covered on the front end surface and the rear end surface of the vacuum assembly sleeve and are respectively connected with the vacuum assembly sleeve in a sealing way;
the front lens group, the vacuum assembly and the rear lens group are sequentially arranged from front to back;
the radial sizes of the front end head of the vacuum component sleeve and the front vacuum sealing window are matched with the size of the clear aperture of the rear end head of the front lens group; the radial sizes of the rear end head of the vacuum component sleeve and the rear vacuum sealing window are matched with the size of the clear aperture of the front end head of the rear lens group; the vacuum assembly is fixedly connected with the front lens group and the rear lens group;
the back focal plane of the front lens group, the filter plane and the front focal plane of the back lens group coincide.
Furthermore, the filtering device also comprises a connecting cover plate, a filtering glass mounting plate, a first annular adjusting gasket, a second annular adjusting gasket and an annular locking cover plate;
the filter glass mounting plate is perpendicular to the surface of the connecting cover plate, is positioned in the center of the connecting cover plate and is fixedly connected with the connecting cover plate; a counter bore is vertically arranged on the filtering glass mounting plate;
the first annular adjusting gasket, the filter glass, the second annular adjusting gasket and the annular locking cover plate are sequentially arranged at the large end of the counter bore along the direction of the small end of the counter bore pointing to the large end, and the plane of the filter is positioned on one side of the first annular adjusting gasket; the annular locking cover plate is connected with the filter glass mounting plate through threads; the first annular adjusting gasket, the filter glass and the second annular adjusting gasket are tightly pressed on the step surface of the counter bore through the annular locking cover plate;
the outer dimension of the connecting cover plate is larger than the radial dimension of the through hole; a plurality of mounting holes are vertically formed along the periphery of the surface of the connecting cover plate;
the outer surface of the vacuum component sleeve at the position of the through hole is planar, and the plane is defined as a first plane; the first plane is provided with a plurality of threaded holes matched with the mounting holes, and the connecting cover plate is connected with the vacuum assembly sleeve in a sealing mode through screws. Like this, on the one hand filter glass thickness is good to be adjusted and simple to operate, and on the other hand, filter equipment can dismantle sealing connection convenience with the vacuum assembly sleeve.
Further, the filter glass is a high-pass filter glass;
the high-pass filter glass comprises a glass substrate and a black ceramic body structure;
a first blind hole is vertically formed in the center of the filter plane of the glass substrate;
the shape of the black ceramic body structure is cylindrical, and the size of the cylindrical shape is matched with that of the first blind hole; a second blind hole is vertically formed in the center of the end face at one end of the black ceramic body structure;
the black ceramic body structure is embedded in the first blind hole, and the hole opening of the second blind hole is arranged outwards. Thus, the black ceramic body structure is used for replacing the non-light-transmitting film, the reflection of light beams is reduced, and the noise of recorded images is further reduced; meanwhile, the problems that when high-energy short pulse laser is adopted, the energy at the focus is large, the non-light-transmitting film in the center of the glass substrate is easily damaged, the object light quality is damaged, the imaging background noise is increased, and even the experimental image is invalid and the test cost is increased can be effectively solved.
Further, for better imaging quality, the diameter and the depth of the second blind hole are both 0.5mm +/-0.05 mm.
Further, in order to reduce the cost of the 4F imaging device when the 4F imaging device is used for measuring the conventional particle field, the filter glass is equal-size plane glass.
Furthermore, in order to facilitate lifting of the filtering device when the filtering device is replaced in different application scenes, the filtering device further comprises a handle;
the handle is installed at the center of the plate surface of the connecting cover plate, and is respectively positioned at the two sides of the connecting cover plate together with the filter glass mounting plate.
Further, the front lens group comprises a front sleeve and a front lens group;
the front lens group is arranged in the front sleeve;
the front lens group comprises a front glass window, a first meniscus negative lens with a concave surface facing an object space, a first meniscus positive lens with a concave surface facing the object space, a first plano-convex lens with a convex surface facing an image space, a second meniscus positive lens with a concave surface facing the image space, a third meniscus positive lens with a concave surface facing the image space, a first plano-concave lens with a concave surface facing the image space and a second meniscus negative lens with a concave surface facing the image space, which are sequentially arranged along a light path.
Further, the rear lens group comprises a rear sleeve and a rear lens group;
the rear lens group is arranged in the rear sleeve;
the rear lens group comprises a second plano-concave lens, a third plano-concave lens, a second plano-convex lens, a fourth positive meniscus lens, a third negative meniscus lens and a rear glass window, wherein the second plano-concave lens is arranged along a light path in sequence, the concave surface of the second plano-concave lens faces the object space, the convex surface of the second plano-convex lens faces the image space, the concave surface of the fourth positive meniscus lens faces the object space, the convex surface of the third plano-convex lens faces the object space, and the concave surface of the third negative meniscus lens faces the image space.
Furthermore, the fixing device also comprises a fixing base for the convenience of fixing the 4F imaging device;
the fixed base is fixedly connected with the vacuum assembly sleeve.
The invention has the beneficial effects that:
(1) according to the particle field holographic 4F imaging device based on filtering, the filtering device, the front lens group and the rear lens group are integrally designed, and the position of the filtering device does not need to be adjusted in imaging, so that the imaging quality is improved, and the problem of difficult high-precision adjustment is avoided; meanwhile, the filtering device is detachably, hermetically and fixedly connected with the vacuum assembly, so that the filtering device is convenient to replace for different application scenes; therefore, the invention solves the technical problems that the high-precision adjustment is difficult, the imaging quality is low and the filter device cannot be replaced in different application scenes when the front lens group, the rear lens group and the filter device are integrated when the existing filtering-based 4F imaging device is used for measurement.
(2) The invention can replace different filtering devices according to different application scene test requirements, thereby widening the application range.
(3) The invention preferably inlays the black ceramic body structure in the center of the glass substrate, thus reducing the reflection of light beams and further reducing the noise of recorded images; meanwhile, the problems that when high-energy short pulse laser is adopted, the energy at the focus is large, the non-light-transmitting film in the center of the glass substrate is easily damaged, the object light quality is damaged, the imaging background noise is increased, and even the experimental image is invalid and the test cost is increased can be effectively solved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a vacuum assembly in an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a filter device according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the structure of a front lens group in an embodiment of the present invention;
FIG. 5 is a schematic view of a rear lens group in an embodiment of the present invention;
FIG. 6 is a schematic structural view of a filter glass in an embodiment of the present invention;
FIG. 7 is a graph showing the relationship between the structural diameter of the black ceramic body and the diameter of the measured particle in the example of the present invention.
The reference numerals in the drawings are explained as follows:
1-front lens group, 11-front sleeve, 12-front lens group, 121-front glass window, 122-first negative meniscus lens, 123-first positive meniscus lens, 124-first plano-convex lens, 125-second positive meniscus lens, 126-third positive meniscus lens, 127-first plano-concave lens, 128-second negative meniscus lens, 2-rear lens group, 21-rear sleeve, 22-rear lens group, 221-second plano-concave lens, 222-third plano-concave lens, 223-second plano-convex lens, 224-fourth positive meniscus lens, 225-third plano-convex lens, 226-third negative meniscus lens, 227-rear glass window, 3-vacuum module, 31-vacuum module sleeve, 32-filter device, 321-filter glass, 3211-glass substrate, 3212-black ceramic body structure, 322-connection cover plate, 323-filter glass mounting plate, 324-first annular adjusting gasket, 325-second annular adjusting gasket, 326-annular locking cover plate, 327-handle, 33-first vacuum valve, 34-second vacuum valve, 35-front vacuum sealing window, 36-rear vacuum sealing window, 4-fixed base.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the invention relates to a particle field holography 4F imaging device based on filtering, which comprises a front lens group 1, a vacuum component 3 and a rear lens group 2.
Referring to fig. 2, the vacuum assembly 3 includes a vacuum assembly sleeve 31, a filter device 32, a first vacuum valve 33, a second vacuum valve 34, a front vacuum sealing window 35, and a rear vacuum sealing window 36.
The wall of the vacuum component sleeve 31 is provided with a through hole. Referring to fig. 3, the filter device 32 includes a filter glass 321; the filter glass 321 is inserted into the inner cavity of the vacuum assembly sleeve 31 through the through hole, and is coaxially arranged with the vacuum assembly sleeve 31, and the inner cavity of the vacuum assembly sleeve 31 is divided into a front cavity and a rear cavity by the filter glass 321; the filter plane of the filter glass 321 is located at the front chamber side; the filter device 32 is detachably and hermetically connected with the vacuum assembly sleeve 31. In the present embodiment, the thickness of the filter glass 321 is adjusted and the installation is convenient; meanwhile, in order to facilitate the detachable sealing connection of the filter device 32 and the vacuum assembly sleeve 31, the filter device 32 preferably further comprises a connection cover plate 322, a filter glass mounting plate 323, a first annular adjustment gasket 324, a second annular adjustment gasket 325 and an annular locking cover plate 326. The filter glass mounting plate 323 is perpendicular to the connecting cover plate 322, and the filter glass mounting plate 323 is located at the center of the connecting cover plate 322 and is fixedly connected with the connecting cover plate 322. A counter bore is vertically arranged on the filter glass mounting plate 323; a first annular adjusting shim 324, the filter glass 321, a second annular adjusting shim 325 and an annular locking cover plate 326 are sequentially arranged at the large end of the counterbore along the direction that the small end of the counterbore points to the large end, and the filter plane is positioned at one side of the first annular adjusting shim 324; the annular locking cover plate 326 is in threaded connection with the filter glass mounting plate 323; the first annular adjuster shim 324, the filter glass 321 and the second annular adjuster shim 325 are pressed against the step surface of the counterbore by an annular locking cover plate 326. The connecting cover plate 322 has an outer dimension larger than the radial dimension of the via hole; a plurality of mounting holes are vertically formed along the periphery of the surface of the connecting cover plate 322; the outer surface of the vacuum component sleeve 31 is planar at the position of the through hole, and the plane is defined as a first plane; a plurality of threaded holes matched with the mounting holes are formed in the first plane, and the connecting cover plate 322 is connected with the vacuum assembly sleeve 31 in a sealing mode through screws. In this embodiment, in order to facilitate lifting of the filtering device 32 when the filtering device 32 is replaced in different application scenarios, the filtering device 32 preferably further includes a handle 327; the handle 327 is installed at the center of the plate surface of the connection cover plate 322, and is located at both sides of the connection cover plate 322 with the filter glass mounting plate 323. The first vacuum valve 33 and the second vacuum valve 34 are both installed on the vacuum assembly sleeve 31, and one end of the first vacuum valve 33 and one end of the second vacuum valve 34 are both communicated with the front chamber and the rear chamber; the other end of the first vacuum valve 33 is used for connecting a vacuum pump; the other end of the second vacuum valve 34 is used for connecting a vacuum gauge pipe; the front vacuum sealing window 35 and the rear vacuum sealing window 36 are respectively covered on the front end surface and the rear end surface of the vacuum assembly sleeve 31, and are respectively connected with the vacuum assembly sleeve 31 in a sealing manner. The vacuum module 3 can be vacuumized down to 0.1Pa, has good sealing performance, and can effectively prevent the surface of the filter glass 321 from being punctured by air.
The front lens group 1, the vacuum component 3 and the rear lens group 2 are arranged from front to back in sequence; the radial sizes of the front end head of the vacuum component sleeve 31 and the front vacuum sealing window 35 are matched with the size of the light-transmitting aperture of the rear end head of the front lens group 1; the radial sizes of the rear end head of the vacuum component sleeve 31 and the rear vacuum sealing window 36 are matched with the size of the clear aperture of the front end head of the rear lens group 2; the vacuum component 3 is fixedly connected with the front lens group 1 and the rear lens group 2. The back focal plane of the front lens group 1, the filter plane and the front focal plane of the back lens group 2 coincide.
Referring to fig. 1 and 4, in the present embodiment, the front lens group 1 preferably includes a front sleeve 11 and a front lens group 12. The front lens group 12 is arranged in the front sleeve 11; the front lens group 12 includes a front glass window 121, a first negative meniscus lens 122 with a concave surface facing the object, a first positive meniscus lens 123 with a concave surface facing the object, a first plano-convex lens 124 with a convex surface facing the image, a second positive meniscus lens 125 with a concave surface facing the image, a third positive meniscus lens 126 with a concave surface facing the image, a first plano-concave lens 127 with a concave surface facing the image, and a second negative meniscus lens 128 with a concave surface facing the image, which are sequentially disposed along the optical path. Referring to fig. 1 and 5, the rear lens group 2 preferably includes a rear sleeve 21 and a rear lens group 22. The rear lens group 22 is disposed in the rear sleeve 21; the rear lens group 22 includes a second plano-concave lens 221 having a concave surface facing the object, a third plano-concave lens 222 having a concave surface facing the object, a second plano-convex lens 223 having a convex surface facing the image, a fourth positive meniscus lens 224 having a concave surface facing the object, a third plano-convex lens 225 having a convex surface facing the object, a third negative meniscus lens 226 having a concave surface facing the image, and a rear glass window 227, which are sequentially disposed along the optical path.
Referring to fig. 1, for the convenience of fixing the 4F imaging device, the filtering-based particle field holography 4F imaging device of the present embodiment preferably further comprises a fixing base 4; the stationary base 4 is fixedly connected to the vacuum assembly sleeve 31.
The particle field holography 4F imaging device based on filtering can replace different filtering devices 32 according to different application scene test requirements. The method comprises the following specific steps:
(1) when the light pulse is incident at low energy and the particle field is normal, the filter glass 321 in the filter device 32 is equal-size plane glass, and the vacuum assembly 3 is not vacuumized.
(2) When the light pulse is incident with high energy and the particle field is normal, the filter glass 321 in the filter device 32 is equal-sized planar glass, and the vacuum module 3 may or may not be evacuated.
(3) When the high-energy incident light pulse is a high-density particle field, referring to fig. 6, the filter glass 321 in the filter device 32 is a high-pass filter glass; the high-pass filter glass comprises a glass substrate 3211 and a black ceramic structure 3212; a first blind hole is vertically formed in the center of the filter plane of the glass substrate 3211; the black ceramic body structure 3212 is cylindrical, and the size of the cylindrical shape is matched with that of the first blind hole; a second blind hole is vertically formed in the center of the end face of one end of the black ceramic body structure 3212; the black ceramic body structure 3212 is embedded in the first blind hole, and the second blind hole is disposed outward. The diameter of the first blind hole, that is, the diameter of the black ceramic structure 3212, is determined by the diameter of the measured particle, specifically referring to fig. 7, in fig. 7, an abscissa d represents the diameter of the measured particle, and an ordinate b represents the diameter of the black ceramic structure 3212. When the uniformity is taken as a particle identification criterion, selecting an area below the curve e; when the edge is taken as the criterion of particle identification, the area above the curve f is selected. In this embodiment, the diameter and the depth of the second blind hole are preferably 0.5mm ± 0.05 mm. The high-pass filter glass with the black ceramic body structure 3212 embedded in the center of the glass substrate 3211 blocks parallel light that is not scattered by particles with the black ceramic body structure 3212, and scattered light that is scattered by the particles can pass through the region of the glass substrate 3211 outside the black ceramic body structure 3212. The vacuum module 3 may or may not be evacuated at high energy incident light pulses, higher density particle fields.
(4) When the light pulse is incident at higher energy and the particle field is at higher density, the filter glass 321 in the filter device 32 is also high-pass filter glass; in this case, the vacuum module 3 needs to be evacuated.
(5) Other optical information processing, different filter glasses 321 may be specifically selected according to different application scenarios.
The particle field holographic 4F imaging device based on filtering can replace different filtering devices according to different application scene test requirements, and the application range is widened.
Claims (8)
1. A particle field holography 4F imaging device based on filtering comprises a front lens group (1) and a rear lens group (2); the method is characterized in that:
further comprising a vacuum assembly (3);
the vacuum assembly (3) comprises a vacuum assembly sleeve (31), a filter device (32), a first vacuum valve (33), a second vacuum valve (34), a front vacuum sealing window (35) and a rear vacuum sealing window (36);
the wall of the vacuum component sleeve (31) is provided with a through hole;
the filter device (32) comprises a filter glass (321); the filter glass (321) is inserted into the inner cavity of the vacuum assembly sleeve (31) from the through hole, is coaxially arranged with the vacuum assembly sleeve (31), and divides the inner cavity of the vacuum assembly sleeve (31) into a front cavity and a rear cavity through the filter glass (321); the filter plane of the filter glass (321) is positioned on one side of the front chamber; the filtering device (32) is detachably connected with the vacuum assembly sleeve (31) in a sealing way;
the first vacuum valve (33) and the second vacuum valve (34) are both arranged on the vacuum assembly sleeve (31), and one end of the first vacuum valve (33) and one end of the second vacuum valve (34) are both communicated with the front cavity and the rear cavity simultaneously; the other end of the first vacuum valve (33) is used for connecting a vacuum pump; the other end of the second vacuum valve (34) is used for connecting a vacuum gauge pipe;
the front vacuum sealing window (35) and the rear vacuum sealing window (36) are respectively covered on the front end surface and the rear end surface of the vacuum assembly sleeve (31) and are respectively connected with the vacuum assembly sleeve (31) in a sealing way;
the front lens group (1), the vacuum component (3) and the rear lens group (2) are sequentially arranged from front to back;
the radial sizes of the front end head of the vacuum component sleeve (31) and the front vacuum sealing window (35) are matched with the size of the clear aperture of the rear end head of the front lens group (1); the radial sizes of the rear end head of the vacuum component sleeve (31) and the rear vacuum sealing window (36) are matched with the size of the clear aperture of the front end head of the rear lens group (2); the vacuum component (3) is fixedly connected with the front lens group (1) and the rear lens group (2);
the back focal plane of the front lens group (1), the filter plane and the front focal plane of the back lens group (2) are superposed;
the filter device (32) further comprises a connecting cover plate (322), a filter glass mounting plate (323), a first annular adjusting gasket (324), a second annular adjusting gasket (325) and an annular locking cover plate (326);
the filter glass mounting plate (323) is perpendicular to the surface of the connecting cover plate (322), and the filter glass mounting plate (323) is positioned at the center of the connecting cover plate (322) and fixedly connected with the connecting cover plate; a counter bore is vertically arranged on the filter glass mounting plate (323);
the first annular adjusting gasket (324), the filter glass (321), the second annular adjusting gasket (325) and the annular locking cover plate (326) are sequentially arranged at the large end of the counter bore along the direction that the small end of the counter bore points to the large end, and the filter plane is positioned on one side of the first annular adjusting gasket (324); the annular locking cover plate (326) is connected with the filter glass mounting plate (323) through threads; pressing a first annular adjusting gasket (324), filter glass (321) and a second annular adjusting gasket (325) on the step surface of the counter bore through the annular locking cover plate (326);
the outer dimension of the connecting cover plate (322) is larger than the radial dimension of the through hole; a plurality of mounting holes are vertically formed along the periphery of the plate surface of the connecting cover plate (322);
the outer surface of the vacuum component sleeve (31) at the position of the through hole is planar, and the plane is defined as a first plane; a plurality of threaded holes matched with the mounting holes are formed in the first plane, and the connecting cover plate (322) is connected with the vacuum assembly sleeve (31) in a sealing mode through screws.
2. The filter-based particle field holographic 4F imaging device of claim 1, wherein:
the filter glass (321) is high-pass filter glass;
the high-pass filter glass comprises a glass substrate (3211) and a black ceramic structure (3212);
a first blind hole is vertically formed in the center of the filter plane of the glass substrate (3211);
the black ceramic body structure (3212) is cylindrical, and the size of the cylindrical shape is matched with that of the first blind hole; a second blind hole is vertically formed in the center of the end face of one end of the black ceramic body structure (3212);
the black ceramic body structure (3212) is embedded in the first blind hole, and the second blind hole is arranged outwards.
3. The filter-based particle field holographic 4F imaging device of claim 2, wherein: the diameter and the depth of the second blind hole are both 0.5mm +/-0.05 mm.
4. The filter-based particle field holographic 4F imaging device of claim 3, wherein: the filter glass (321) is equal-size plane glass.
5. The filter-based particle field holographic 4F imaging device of any of claims 1 to 4, wherein:
the filter device (32) further comprises a handle (327);
the handle (327) is arranged in the center of the plate surface of the connecting cover plate (322), and is respectively positioned on two sides of the connecting cover plate (322) together with the filter glass mounting plate (323).
6. The filter-based particle field holographic 4F imaging device of claim 5, wherein:
the front lens group (1) comprises a front sleeve (11) and a front lens group (12);
the front lens group (12) is arranged in the front sleeve (11);
the front lens group (12) comprises a front glass window (121), a first negative meniscus lens (122) with a concave surface facing an object space, a first positive meniscus lens (123) with a concave surface facing the object space, a first plano-convex lens (124) with a convex surface facing an image space, a second positive meniscus lens (125) with a concave surface facing the image space, a third positive meniscus lens (126) with a concave surface facing the image space, a first plano-concave lens (127) with a concave surface facing the image space and a second negative meniscus lens (128) with a concave surface facing the image space, which are sequentially arranged along a light path.
7. The filter-based particle field holographic 4F imaging device of claim 6, wherein:
the rear lens group (2) comprises a rear sleeve (21) and a rear lens group (22);
the rear lens group (22) is arranged in the rear sleeve (21);
the rear lens group (22) comprises a second plano-concave lens (221) with a concave surface facing an object space, a third plano-concave lens (222) with a concave surface facing the object space, a second plano-convex lens (223) with a convex surface facing an image space, a fourth positive meniscus lens (224) with a concave surface facing the object space, a third plano-convex lens (225) with a convex surface facing the object space, a third negative meniscus lens (226) with a concave surface facing the image space and a rear glass window (227) which are sequentially arranged along an optical path.
8. The filter-based particle field holographic 4F imaging device of claim 7, wherein:
also comprises a fixed base (4);
the fixed base (4) is fixedly connected with the vacuum assembly sleeve (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911386157.1A CN111025518B (en) | 2019-12-29 | 2019-12-29 | Particle field holographic 4F imaging device based on filtering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911386157.1A CN111025518B (en) | 2019-12-29 | 2019-12-29 | Particle field holographic 4F imaging device based on filtering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111025518A CN111025518A (en) | 2020-04-17 |
| CN111025518B true CN111025518B (en) | 2021-10-08 |
Family
ID=70194916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911386157.1A Active CN111025518B (en) | 2019-12-29 | 2019-12-29 | Particle field holographic 4F imaging device based on filtering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111025518B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060143853A1 (en) * | 2004-12-30 | 2006-07-06 | Agerlid Charles G | Liquid separator for vacuum filter |
| US9625671B2 (en) * | 2013-10-23 | 2017-04-18 | Lasermax, Inc. | Laser module and system |
| US11294105B2 (en) * | 2018-01-25 | 2022-04-05 | Tdk Taiwan Corp. | Optical system |
| CN108550268B (en) * | 2018-07-10 | 2023-09-12 | 安徽师范大学 | Speed-measuring camera device for road automobile |
-
2019
- 2019-12-29 CN CN201911386157.1A patent/CN111025518B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111025518A (en) | 2020-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102141439B (en) | Method for assembling convex grating imaging spectrometer | |
| CN102147234B (en) | Laser triangulation sensor | |
| CN105675633A (en) | Calibration device of X-ray framing camera | |
| CN111025518B (en) | Particle field holographic 4F imaging device based on filtering | |
| CN111025517B (en) | Particle field holographic 4F imaging system and method based on filtering | |
| US10007101B2 (en) | Illumination device for a microscope or an optical 3D surface measuring apparatus | |
| CN115576082B (en) | Remote large-breadth imaging system for extreme illumination environment | |
| CN114144705A (en) | Light shielding plate, camera unit, electronic apparatus, and method for manufacturing light shielding plate | |
| CN210863591U (en) | X-ray synchronous imaging detection device | |
| CN109708759B (en) | Imaging spectrometer based on laminated glass mapping | |
| CN113008162B (en) | Detection device and detection method for surface morphology of off-axis elliptic cylindrical mirror | |
| CN209230530U (en) | A kind of displacement measurement sensor | |
| CN211086146U (en) | Soft X-ray microscopic imaging detector | |
| CN210721010U (en) | High-time-resolution framing photographic system | |
| CN208337777U (en) | Active focusing mechanism | |
| KR101478572B1 (en) | Auto Focus System Using Zoom Objective Lens | |
| US20060164859A1 (en) | Integration rod and method for inhibiting stray light | |
| CN220357243U (en) | Optical microstructure and laser radar | |
| CN218766574U (en) | Image detection device | |
| CN110940282A (en) | Dual-wavelength laser receiving optical system and laser ranging receiving device | |
| CN213516901U (en) | Image detection device | |
| CN109489565A (en) | A kind of displacement measurement sensor and method | |
| CN113008133B (en) | Cylindrical lens for detection | |
| CN210864151U (en) | Lens assembly and electronic device | |
| CN220525698U (en) | Sample positioning device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |