WO2004005897A1 - Procede et dispositif permettant de mesurer un flux lumineux retrodiffuse par un milieu disperse, non perturbe par les reflexions aux interfaces - Google Patents
Procede et dispositif permettant de mesurer un flux lumineux retrodiffuse par un milieu disperse, non perturbe par les reflexions aux interfaces Download PDFInfo
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- WO2004005897A1 WO2004005897A1 PCT/FR2003/001959 FR0301959W WO2004005897A1 WO 2004005897 A1 WO2004005897 A1 WO 2004005897A1 FR 0301959 W FR0301959 W FR 0301959W WO 2004005897 A1 WO2004005897 A1 WO 2004005897A1
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- wall
- interface
- light rays
- dispersed medium
- light
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- 230000004907 flux Effects 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000003993 interaction Effects 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 14
- 230000005855 radiation Effects 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims description 4
- 238000000149 argon plasma sintering Methods 0.000 claims 1
- 238000004364 calculation method Methods 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 238000005286 illumination Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000009304 pastoral farming Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/0303—Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
- G01N15/0227—Investigating particle size or size distribution by optical means using imaging; using holography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/51—Scattering, i.e. diffuse reflection within a body or fluid inside a container, e.g. in an ampoule
Definitions
- the present invention relates to a method and a device for measuring a light flux backscattered by a dispersed medium placed on one side of a wall, by interaction with a plurality of light rays emitted on the second side of said wall opposite to the first side on which said dispersed medium is placed and towards the latter, said plurality of light rays being able to pass through said wall and being at least partially backscattered by said dispersed medium towards reception means placed on the second side of the wall; as regards the device, said wall being able to be traversed by said light rays emitted and backscattered, and to be in contact with said dispersed medium.
- the prior art teaches such a method and device.
- the radiation backscattered by the dispersed medium in the form of a light flux passes through the separating wall between the dispersed medium and the receiver of the light flux backscattered by said dispersed medium, before reaching said receiver; and therefore, the applicant has noted that said wall reflects part of the light rays backscattered by the dispersed medium, and returns them therein, these reflected rays can then be backscattered again by the medium towards the wall and reach the light flux receptor placed on the other side of this wall, causing disturbances in the light flux backscattered by the dispersed medium relative to the light flux emitted, and consequently, errors in measuring the light flux backscattered by the dispersed medium.
- the dispersed medium analyzed is generally of an optical index stronger than that of air and weaker than that of the material constituting the wall.
- the light rays re-emitted by the medium can have very inclined exit angles. The calculation models using the measurement of the backscattered light flux do not take into account these light rays re-emitted by the medium.
- Figure 1 illustrates the problem of light rays reflected by the wall and re-emitted by the medium.
- the medium 1 comprises for example particles 2 on which the light rays diffuse; certain backscattered rays 4 through the medium pass through the wall 3 to form the backscattered light flux which must be measured, while other backscattered light rays 5, instead of passing through the wall 3, are reflected by the latter, and returned to the medium 1, which can re-emit them in another place so that they are added to the backscattered light flux, thereby disturbing in particular its distribution.
- Reference 6 illustrates the backscatter spot constituting the backscattered light flux.
- said backscattering spot from the backscattered light rays having passed through said wall and free, at least in a direction extending from the light barycenter of said spot, from light rays coming from said central zone and having undergone a total reflection on the surface forming the interface of said wall with said second side, - measuring at least one spatial sampling of a profile of the light flux in said backscattering spot thus obtained, extending in said at least one direction.
- the method according to the invention allows, thanks to the suppression in the backscattering spot of the light rays coming from said central zone and having undergone a total reflection to provide an undisturbed light flux, and therefore a more precise, more faithful measurement for the or mathematical models that can be used to characterize the dispersed environment.
- the method according to the invention consists in:
- said backscattering spot from the backscattered light rays having passed through said wall and free, between two directions extending from the light barycenter of said spot, from light rays coming from said central zone and having undergone a total reflection on the surface forming the interface of said wall with said second side,
- the method according to the invention also consists in determining the values of the free transport path 1 * and of the absorption length l a by using a determined photon-dispersion interaction model, from said sampling. spatial profile of the luminous flux.
- the method according to the invention consists in preventing light rays coming from said central zone and having undergone a total reflection on the surface forming the interface of said wall with the second side, from returning to said dispersed medium .
- This characteristic consists in deflecting the light rays coming from total reflections out of the dispersed medium so that these reflected rays no longer disturb the distribution of the light flux therein, and do not modify the light flux in the backscattering spot.
- the method according to the invention consists in associating a first surface forming the interface of said wall with said first side, with a second surface forming the interface of said wall with said second side, said first and second surfaces being parallel.
- the exploitable half-width of said wall is less than or equal to twice the thickness of said wall minus four times the maximum free transport path l * max of said dispersed medium.
- the method according to the invention consists in associating a first surface forming the interface of said wall with said first side, with a second surface forming the interface of said wall with said second side, said first and second surfaces being non-parallel.
- said first surface forming the interface of said wall with said first side is curved
- said second surface forming the interface of said wall with said second side is planar.
- said first surface forming the interface of said wall with said first side is cylindrical. According to another characteristic, said first surface forming the interface of said wall with said first side is planar, and said second surface forming the interface of said wall with said second side is concave.
- said second surface forming the interface of said wall with said second side is conical or frustoconical.
- the method according to the invention consists in avoiding the total reflection of a light ray coming from said central zone and having undergone a total reflection on the surface forming the interface of said wall with the second side, through which pass the backscattered light rays intended to form said backscattering spot.
- This characteristic consists in preventing the formation of light rays coming from said central zone and capable of undergoing total reflection, so that these do not disturb the distribution of light in the medium, and do not modify the light flow in the backscatter spot.
- the formation of a light ray coming from said central zone and having undergone a total reflection on the surface forming the interface of said wall with the second side is avoided by the adoption of an appropriate shape of said interface surface, so that the backscattered light rays striking said interface surface have an angle of incidence less than the total reflection angle.
- the method according to the invention consists in associating a first flat surface forming the interface of said wall with said first side, with a second convex surface forming the interface of said wall with said second side.
- said second surface takes the form of a spherical cap.
- said second surface adopts a frustoconical shape.
- the invention also relates to a device making it possible to measure a light flux backscattered by a dispersed medium placed on one side of a wall, by interaction with a plurality of light rays emitted from the second side of said wall opposite the first side where said dispersed medium is placed and towards the latter, said plurality of light rays being able to pass through said wall and being at least partially backscattered by said dispersed medium towards reception means placed on the second side of the wall, said wall being able to be crossed by said light rays emitted and backscattered, and to be in contact with said dispersed medium, said device being characterized in that it comprises: - means for emitting, towards said wall, a light radiation able to cross the wall and reach said dispersed medium, so that the latter can in turn emit through said wall, a plurality of light rays backscattered in order to form a backscattering spot in which is defined at least one central zone in the form of a disc whose center corresponds to the
- said receiving means for receiving the light radiation backscattered by said medium dispersed through said wall and intended to form said backscattering spot, said receiving means covering at least one direction extending from the light barycenter of said spot,
- - measuring means a spatial sampling of the profile of the light flux received by at least part of said reception means.
- said reception means extend at least over a surface defined between two said directions concurrent with said light barycenter.
- the device comprises means for calculating the values of the free transport path 1 * and the absorption length l a of said dispersed medium from a measurement of said spatial sampling of the profile of the light flux.
- said means for suppressing the backscattered light rays coming from said central zone and having undergone a total reflection on the surface forming the interface of said wall with said second side comprise means for diverting said dispersed medium out of said dispersed medium light rays having undergone total reflection, said deflection means comprising the association of a first surface forming the interface of said wall with said first side, and of a second surface forming the interface of said wall with said second side .
- said first and second surfaces are plane and parallel, the exploitable half-width of said wall in order to form said backscattering spot being less than or equal to twice the thickness of said wall minus four times the maximum free transport path l * max of said dispersed medium.
- said first surface forming the interface of said wall with said first side is curved, and said second surface forming the interface of said wall with said second side is planar.
- said first surface forming the interface of said wall with said first side is cylindrical.
- said first surface forming the interface of said wall with said first side is planar, and said second surface forming the interface of said wall with said second side is concave.
- said second surface forming the interface of said wall with said second side adopts a conical or frustoconical shape, the axis of the cone or of the frustoconical part being perpendicular to the first planar surface.
- said means for suppressing backscattered light rays coming from said central zone and having undergone a total reflection on the surface forming the interface of said wall with said second side comprise means for preventing the formation of a said light ray having undergone a total reflection, on this said surface forming the interface of said wall with the second side.
- said means for preventing the formation of a light ray from total reflection, on the surface forming the interface of said wall with the second side comprise an appropriate shape of said interface surface so that the rays backscattered light striking this so-called interface surface have an angle of incidence less than the angle of total reflection.
- said means for preventing the formation of a light ray from total reflection, on the surface forming the interface of said wall with the second side comprise a first planar surface forming the interface of said wall with said first side associated with a second convex surface forming the interface of said wall with said second side.
- said second surface takes the form of a spherical cap.
- said second surface adopts a frustoconical shape.
- FIG. 1A illustrates the prior art and the problem posed by the light rays coming from reflection on the separating wall between the dispersed medium and the means for receiving the light flux.
- FIG. 1B illustrates the prior art, and more particularly a backscattered light flux profile comprising light rays coming from reflection on said separating wall, obtained according to the configuration of FIG. 1A.
- FIG. 2 shows a schematic top view of a first exemplary embodiment of a device according to the invention, making it possible to measure a light flux backscattered by a dispersed medium.
- Figure 3 shows a first detail of the example in Figure 1.
- Figure 4 shows a second detail of the example of Figure 1.
- Figure 5 shows a third detail of the example of Figure 1, in front view.
- FIG. 6 shows the detail according to Figure 5, seen from above.
- FIG. 7 shows a second example of the second detail in FIG. 4.
- Figure 8 shows a detail of the second example of Figure 7, in front view.
- FIG. 10 shows a partial schematic top view of a second exemplary embodiment of a device according to the invention, making it possible to measure a light flux backscattered by a dispersed medium.
- FIG. 11 shows a partial schematic top view of a third exemplary embodiment of a device according to the invention, making it possible to measure a light flux backscattered by a dispersed medium.
- FIG. 12 shows a partial schematic front view of the third example according to FIG. 11.
- FIG. 13 shows a partial schematic top view of a fourth exemplary embodiment of a device according to the invention, making it possible to measure a light flux backscattered by a dispersed medium.
- FIG. 14 shows a partial schematic top view of a fifth exemplary embodiment of a device according to the invention, making it possible to measure a light flux backscattered by a dispersed medium.
- the device represented in FIGS. 2 to 6, making it possible to measure a backscattered light flux 11 by a dispersed medium 12 placed on a first 13 side of a wall 14, by interaction with a plurality of light rays 15 emitted from the second 16 side of this wall 14, opposite the first side where the dispersed medium is placed and in the direction of the latter, the plurality of light rays being able to pass through the wall 14 and being at least partially backscattered by the dispersed medium in the direction of means of reception 17 placed on the second side of the wall, the wall 14 being capable of being traversed by the light rays emitted and backscattered, and of being in contact with the dispersed medium, comprises:
- a backscattering spot 19 in which, as shown in FIG. 3, is defined at least one central zone 20 in the form of a disc, the center 21 of which corresponds to the light barycenter of the backscattering spot and whose radius 36 is equal to four times the maximum free transport path l * ma ⁇ of the dispersed medium, the backscattering spot 19 being able to be imaged at least in part on the reception means 17,
- the means 18 for emitting light radiation advantageously comprise a monochromatic or polychromatic light source 37, for example a laser diode, of relatively small or zero angular divergence, preferably.
- the light beam emitted can be focused so as to obtain an impact point in the dispersed medium as small as possible, at the surface 29 interface between the wall 14 and the dispersed medium.
- the light beam emitted will advantageously be substantially perpendicular to the first 29 and second 30 surfaces constituting the interfaces of the wall 14 with the first 13 and second 16 sides, respectively, or substantially perpendicular to surfaces tangent to the interface surfaces, when the latter are curved.
- an incident emission angle of up to about 25 ° may be suitable.
- the backscattered light flow 11 forms a backscattering spot 19 as described above, capable of being imaged at least in part, by virtue of the reception means 17.
- the pictured part 39 of the backscattering spot 19 is given by a light 41, comprising for example a plurality of elementary sensor parts 38, for example a matrix sensor, a CCD camera, or a CMOS camera, the arrangement of which and the extent of the surface which captures the light represent the part of the backscattering spot which will be imaged, for example on a monitor or in a data file (not shown).
- a light 41 comprising for example a plurality of elementary sensor parts 38, for example a matrix sensor, a CCD camera, or a CMOS camera, the arrangement of which and the extent of the surface which captures the light represent the part of the backscattering spot which will be imaged, for example on a monitor or in a data file (not shown).
- a light 41 comprising for example a plurality of elementary sensor parts 38
- the pictorial part of the backscattering spot 19 is given by a plurality of elementary parts 38 of sensors, or pixels 38, aligned in a direction 22 as defined above.
- the pictorial part of the refraction spot therefore consists of a linear strip of width equal to that of a pixel and of appropriate length, covering for example the entire spot in this direction 22 from the center 21, as shown in Figure 4 and as will be explained in more detail later.
- the reception means 17 comprise optical means 34 placed between the separating wall and the sensor 41, with a view to transporting the image of the retransmission task on the sensor 41.
- the device according to the invention will be provided for measuring backscattered light fluxes from determined dispersed media, the refrodiffusion spot being a function of the dispersed medium which one seeks advantageously to measure determined parameters, and representative thereof.
- the maximum value of the free transport path 1 * of the dispersed medium which can be measured, if necessary, is determined for the construction of the device, ie l * ma ⁇ , in order to determine the maximum extent of the spot.
- the suppression means 23 from the light rays backscattered by the dispersed medium 12, the light rays 33 coming from the central zone 20 and having undergone a total reflection on the surface 30 forming the interface of the wall 14 with the second side 16 include means of diversion 28 out of the dispersed medium 12, light rays from total reflections, the means of diversion from the dispersed medium light rays from total reflections comprising the association of the first 29 surface forming the interface the wall 14 with the first 13 side, and the second surface forming the interface of the wall 14 with the second 16 side.
- the first 29 and second 30 surfaces are planar and parallel, the exploitable half-width 31 of the wall 14 in order to form the reflow spot 19 being less than or equal to twice the thickness 32 of wall 14 minus four times the free maximum transport path l * max of the dispersed medium 12.
- Figure 2 there are shown two examples of light rays 33 backscattered by the medium 12 from the point of contact of the emitted radiation, then reflected on the surface 30 at a total angle of reflection, and which are deflected out of the dispersed medium 12.
- the means 24 for measuring a spatial sampling of the profile of the light flux received by at least part of the reception means 17, comprise a computer 42 capable of calculating the profile of the light flux received by at least part of the sensor 41, determined as required, or all of the light flux received by the sensor 41.
- the measurement means 24 also comprise control means 43 making it possible to select the part of the sensor 41 for which it is desired to calculate the light flux backscattered by the dispersed medium 12, if applicable.
- the measurement means 24 also advantageously comprise means 27 for calculating the values of the free transport path 1 * and the absorption length l a of the dispersed medium 12 from a measurement of the spatial sampling of the flow profile luminous.
- the device will advantageously use a calculation model which will be incorporated in the calculation means 27, comprising two distinct laws depending on the area of the measured backscattered flux:
- the sensor 641 comprises a plurality of elementary parts 638 of the sensor, by example a matrix sensor, a CCD camera, or a CMOS camera, extending over a defined surface 625 in two directions 622, 635 concurrent with the light barycenter 621, as shown in FIG. 7.
- the sensor 641 adopts a substantially square shape, in order to ensure reception of a quarter of the backscattering spot.
- the sensor can adopt a circular sector shape (not shown) in order to "stick" as close as possible to the external perimeter of the spot 619.
- FIG. 10 illustrates a second example of a separating wall 114 violates the dispersed medium 112 and the light flux receptor.
- the elements similar to those of the example illustrated in FIGS. 2 to 6 bear the same references added to the number 100.
- FIG. 10 illustrates a second example of a separating wall 114 violates the dispersed medium 112 and the light flux receptor.
- the means 123 for removing the backscattered light rays from the central zone and having undergone a total reflection on the surface 130 forming the interface of the wall 114 with the second side 116 comprise means of diversion 128 out of the dispersed medium 112, light rays coming from total reflections, the means of diversion out of the dispersed medium, light rays from total reflections comprising the association of a first 129 surface forming the interface of the wall 114 with the first 113 side, and a second 130 surface forming the interface of the wall 114 with the second 116 side, the first surface 129 forming the interface of the wall 114 with the first 113 side being curved, and the second 130 surface forming the interface of the wall with the second 116 side being planar.
- FIGS. 11 and 12 illustrate a third example of a separating wall 214 between the dispersed medium 212 and the receptor for the light flux.
- the elements similar to those of the example illustrated in FIGS. 2 to 6 bear the same references added with the number 200.
- FIGS. 11 and 12 illustrate a third example of a separating wall 214 between the dispersed medium 212 and the receptor for the light flux.
- the means 223 for removing the light rays backscattered from the central area and having undergone a total reflection on the surface 230 forming the interface of the wall 214 with the second side 216 comprise means of diversion 228 out of the dispersed medium 212, light rays coming from total reflections, the means of diversion out of the dispersed medium, light rays from total reflections comprising the association of a first 229 surface forming the interface of the wall 214 with the first 213 side, and a second 230 surface forming the wall interface 214 with the second 216 side, the first 229 surface forming the interface of the wall 214 with the first 213 side being planar, and the second 230 surface forming the interface of the wall with the second 216 side being concave.
- the second surface 230 forming the interface of the wall 214 with the second side 216 adopts a conical (not shown) or frustoconical shape as shown in FIG. 11, the axis 250 of the cone ( not shown) or of the frustoconical part being perpendicular to the first flat surface.
- the frustoconical part will be determined so that the rays reflected by the medium having too great an incidence and which therefore should be totally reflected meet the conical part and will thus be rejected towards the edges, out of the medium 212, as shown in FIG. 11.
- the rays having an even stronger incidence meet a flat surface 249 close to, and surrounding the fronconic part, which will suffice to reject them outside the dispersed medium 212.
- the angle ⁇ c of the frustoconical part, as shown in FIG. 11, will be substantially equal to:
- the circular planar zone 251 constituting the apex of the frustoconical part will have a radius r s determined by the following formula:
- the means 423 for suppressing the backscattered light rays coming from total reflection on the surface forming the interface of the wall 414 with the second side 416 include means 460 for preventing the formation of a light ray coming from the central area and having undergone a total reflection on this
- the targeted reflected rays are no longer deflected out of the dispersed medium concerned, but their generation is prevented.
- 15 416 side include a suitable form of the interface surface 430 so that the backscattered light rays striking this interface surface 430 have an angle of incidence less than the angle of total reflection.
- 20 414 with the second 416 side comprise a first 429 flat surface forming the interface of the wall 414 with the first 413 side associated with a second 430 convex surface, in the example according to FIG. 13 a second surface adopting the shape of a spherical cap, forming the interface of the wall 414 with the second side 416.
- n p optical index of the material of the wall 414
- n s optical index of the dispersed medium 413
- the thickness ep of the wall at the center along the axis 415 is 6.52 mm.
- the thickness at the center along the axis 415 of the lens to be bonded is 1.93 mm, and the blade with flat faces has a thickness of 4.59 mm.
- the elements similar to those of the example illustrated in FIGS. 2 to 6 bear the same references added to the number 500.
- the example according to FIG. 14 is similar to the example according to FIG. 13, with the exception of the second 530 surface adopting a fronconic shape, which is however calculated according to considerations similar to those of the example according to FIG. 13.
- the means 523 for removing the backscattered light rays from total reflection on the surface forming the interface of the wall 514 with the second side 516 include means 560 for preventing the formation of a light ray from the central area and having undergone a total reflection on this surface 530 forming the interface of the wall 514 with the second side 516.
- the means 560 for preventing the formation of a light ray coming from the central area and having undergone a total reflection on the surface 530 forming the interface of the wall 514 with the second side 516 comprise an appropriate shape of the interface surface 530 for that back-scattered light rays coming from said cenfral zone, for example the extreme light rays 572, 573, striking this interface surface 530 have an angle of incidence Oj less than the total reflection angle.
- the second 530 surface adopts a frustoconical shape.
- the limit backscattered light ray 573 is shown offset from the axis 515 by a distance 574 corresponding to 4 l * max .
- l * max free maximum transport path of the dispersed medium studied in the device.
- a backscattered light ray limit 572 still emerging through the small base 551 of the frustoconical part must have an incidence and; equal to the Brewster angle c ⁇ : this gives:
- Tan (a) (ep - e ext ) / (r 2 - x ⁇ ) (equation 6),
- the separating walls 14, 14, 214, 414, 514 can each be included in a tank intended to contain the dispersed medium for which it is sought to measure the backscattered flux, or to constitute the wall of a probe, separator encloses the receptor of the re-diffused light flow and the dispersed medium, the wall of the probe then being carried in contact with the dispersed medium. It should also be noted that other models than the one which has been described here can be used to operate the devices according to the invention, in particular those described above.
- the method makes it possible to measure a backscattered light flux 11, 111, 211, by a dispersed medium 12, 112, 212, for example an emulsion, a suspension, a multiphase medium, or the like, placed on a first 13, 113, 213, next to a wall 14, 114, 214, by interaction with a plurality of light rays 15, 115, 215, emitted from the second 16, 116, 216 , side of the wall 14, 114, 214, opposite to the first side where the dispersed medium is placed, and in the direction of the latter, the plurality of light rays being able to strike the wall and being at least partially diffused by the dispersed medium towards receiving means 17 placed on the second side of the wall, the method comprising at least the following steps:
- the dispersed medium is able in turn to emit, through the wall, a plurality of back-scattered light rays 11, 111, 211 with a view to forming a re-scattering spot 19 in which at least one disc-shaped cenfral zone 20 is defined, the center 21 of which corresponds to the light barycenter of the back-scattering spot 20 and whose radius 36 is equal to four times the maximum free transport path l * max of the dispersed medium, the refrodiffusion spot 19 being able to be imaged at least in part on the reception means 17,
- stream profile luminous replaced by the following:
- FIG. 13 or 14 Another example of a method according to the invention is described below with the aid of FIG. 13 or 14. It consists in avoiding the total reflection of a light ray coming from the central zone and having undergone a total reflection on the surface forming the interface of said wall 414, 514 with the second side 416, 516, through which pass the backscattered light rays intended to form the backscattering spot, by adopting an appropriate form of the interface surface 430, 530, so that the backscattered light rays striking this interface surface have an angle of incidence less than the total reflection angle.
- the method advantageously consists in associating a first 429, 529 flat surface forming the interface of the wall 414, 514 with the first 413, 513 side, to a second 430, 530 convex surface forming the interface of the wall with the second 416 , 516 side.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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AU2003260625A AU2003260625A1 (en) | 2002-07-02 | 2003-06-25 | Method and device for measuring a light flux backscattered by a dispersed medium, unperturbed by interface reflections |
EP03762707A EP1540312A1 (fr) | 2002-07-02 | 2003-06-25 | Procede et dispositif permettant de mesurer un flux lumineux retrodiffuse par un milieu disperse, non perturbe par les reflexions aux interfaces |
US10/519,460 US7312868B2 (en) | 2002-07-02 | 2003-06-25 | Method and device for measuring a light flux backscattered by a dispersed medium, unperturbed by interface reflections |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR0208235A FR2841983B1 (fr) | 2002-07-02 | 2002-07-02 | Procede et dispositif permettant de mesurer un flux lumineux retrodiffuse par un milieu disperse, non perturbe par les reflexions aux interfaces |
FR02/08235 | 2002-07-02 |
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WO2004005897A1 true WO2004005897A1 (fr) | 2004-01-15 |
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PCT/FR2003/001959 WO2004005897A1 (fr) | 2002-07-02 | 2003-06-25 | Procede et dispositif permettant de mesurer un flux lumineux retrodiffuse par un milieu disperse, non perturbe par les reflexions aux interfaces |
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US (1) | US7312868B2 (fr) |
EP (1) | EP1540312A1 (fr) |
AU (1) | AU2003260625A1 (fr) |
FR (1) | FR2841983B1 (fr) |
WO (1) | WO2004005897A1 (fr) |
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---|---|---|---|---|
FR2938917B1 (fr) * | 2008-11-26 | 2018-05-18 | Formulaction | Dispositif d'analyse d'un melange polyphasique via un faisceau de lumiere retrodiffusee par celui-ci |
FR2945629B1 (fr) | 2009-05-15 | 2011-06-10 | Formulaction | Procede de caracterisation rheologique d'un milieu complexe |
JP5709368B2 (ja) * | 2009-11-04 | 2015-04-30 | キヤノン株式会社 | 生体情報取得装置 |
CN109682754B (zh) * | 2017-10-19 | 2021-10-01 | 中国石油化工股份有限公司 | 多通道稳定性分析仪 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3843268A (en) * | 1973-07-05 | 1974-10-22 | Beckman Instruments Inc | Sample container for laser light scattering photometers |
EP0404258A2 (fr) * | 1989-06-20 | 1990-12-27 | Claudio Bonini | Tube à essai avec surface extérieure lenticulaire, notament pour les analyses cliniques automatisées |
EP0447991A1 (fr) * | 1990-03-19 | 1991-09-25 | Horiba, Ltd. | Dispositif de mesure de la distribution des dimensions de particules diffractantes/dispersantes |
US6100541A (en) * | 1998-02-24 | 2000-08-08 | Caliper Technologies Corporation | Microfluidic devices and systems incorporating integrated optical elements |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2191280A (en) * | 1986-04-28 | 1987-12-09 | London Polytech | Flocculation monitor |
US5899552A (en) * | 1993-11-11 | 1999-05-04 | Enplas Corporation | Surface light source device |
JP3920364B2 (ja) * | 1994-12-28 | 2007-05-30 | 株式会社エンプラス | 二光束生成方法及び二光束生成型面光源装置 |
-
2002
- 2002-07-02 FR FR0208235A patent/FR2841983B1/fr not_active Expired - Fee Related
-
2003
- 2003-06-25 AU AU2003260625A patent/AU2003260625A1/en not_active Abandoned
- 2003-06-25 EP EP03762707A patent/EP1540312A1/fr not_active Withdrawn
- 2003-06-25 WO PCT/FR2003/001959 patent/WO2004005897A1/fr not_active Application Discontinuation
- 2003-06-25 US US10/519,460 patent/US7312868B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3843268A (en) * | 1973-07-05 | 1974-10-22 | Beckman Instruments Inc | Sample container for laser light scattering photometers |
EP0404258A2 (fr) * | 1989-06-20 | 1990-12-27 | Claudio Bonini | Tube à essai avec surface extérieure lenticulaire, notament pour les analyses cliniques automatisées |
EP0447991A1 (fr) * | 1990-03-19 | 1991-09-25 | Horiba, Ltd. | Dispositif de mesure de la distribution des dimensions de particules diffractantes/dispersantes |
US6100541A (en) * | 1998-02-24 | 2000-08-08 | Caliper Technologies Corporation | Microfluidic devices and systems incorporating integrated optical elements |
Also Published As
Publication number | Publication date |
---|---|
AU2003260625A1 (en) | 2004-01-23 |
US7312868B2 (en) | 2007-12-25 |
FR2841983A1 (fr) | 2004-01-09 |
FR2841983B1 (fr) | 2004-10-08 |
US20060061766A1 (en) | 2006-03-23 |
EP1540312A1 (fr) | 2005-06-15 |
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