Analysis Methods for LiDAR Glass

Abstract

One aspect of the present invention relates to a method for analyzing a window glass (201) intended for correction by using a laser radar (202) configured to emit a light wave intended to pass through the vehicle window glass (201) according to a given emission angle, comprising the following steps: - for a plurality of points of the window glass (201): ○ obtaining a horizontal local slope and a vertical local slope at said point (2031); ○ calculating the vertical local slope and the horizontal local slope at said point and a vertical angular deviation (δv) and a horizontal angular deviation (δh) of the inclination (θ) of the window glass (201) based on the vertical component (αv) and the horizontal component of the emission angle of the light wave passing through the window glass (201) at said point; - calculating the vertical angular deviation (δv) and the horizontal angular deviation (δh) of the inclination (θ) of the window glass (201) according to the calculated vertical angular deviation (δh); v ) and horizontal angular deviation (δ h )Create an angle correction diagram.

Description

Technical Field

[0001] The technical field of the present invention is the technical field of laser radar (LiDAR), in particular, a laser radar that emits light waves through a vehicle window glass.

[0002] The present invention relates to a method for analyzing window glass, which is used in a method associated with the window glass and is intended to be used by a laser radar for correction, and in particular to a method for analyzing window glass, which is intended to be used by a laser radar for correction configured to emit light through the window glass. Background Art

[0003] In the automotive industry, it is known to use LiDAR (Light Detection and Ranging) as a system for assisting driving, more specifically for detecting obstacles located in the vicinity of the vehicle and evaluating the distance between the vehicle and each obstacle. For this purpose, LiDAR is incorporated inside the vehicle, most often behind the windshield, as described in document WO2018115090.

[0004] To detect an object and estimate its position, a lidar emits a light wave toward the object and measures the round-trip propagation time of the light wave. However, it is known that the presence of window glass in the path of the light wave can lead to errors caused by distortion when the lidar estimates the position of the object.

[0005] Conventionally, these errors are corrected by calibrating a lidar that has been installed behind a window pane using a calibration target. In document DE102017003634, a lidar is calibrated using a fluorescent target, making it possible to record the intersection points between the target and the light waves emitted by the lidar.

[0006] However, such a solution adds a lengthy and expensive step during the quality control of the vehicle and uses dedicated equipment that is cumbersome due to the space required, using special targets with geometrical tolerances that must be verified.

[0007] Therefore, while correcting the above shortcomings, it is necessary to correct the position estimation error caused by the lidar. Summary of the invention

[0008] The present invention provides a solution to the above mentioned problems by making it possible to obtain an angular correction map for the LiDAR, thus overcoming the above mentioned drawbacks.

[0009] A first aspect of the invention relates to a method for analyzing a vehicle window pane for calibration, the method being intended for a laser radar configured to emit light waves, the window pane comprising an inner free surface facing the interior of the vehicle and an outer free surface facing the exterior of the vehicle, each light wave being intended to pass through the window pane and being defined by a given point of impact on the inner free surface, the inner free surface defining a surface plane having a given inclination relative to a horizontal plane having a horizontal axis, the horizontal axis being perpendicular to the vertical axis and to a normal axis included in the surface plane, the method comprising the following steps:

[0010] -For each point in the window glass point set:

[0011] o determine the local thickness of the window glass at said point;

[0012] ○ obtaining the horizontal local slope and the vertical local slope at the point from the local thickness at the point by digital processing;

[0013] o calculating a vertical angular offset based on the vertical component of the emission angle of the light wave intended to pass through the window pane at said point, the vertical local slope at said point, and the inclination of the window pane;

[0014] o calculating a horizontal angular offset based on the horizontal component of the emission angle of the light wave intended to pass through the window pane at said point, the horizontal local slope at said point and the inclination of the window pane;

[0015] - Creating an angle correction map comprising, for each point in the set of points, a vertical angle offset and a horizontal angle offset calculated for said point.

[0016] By means of the invention, for a plurality of points of the window pane, an angle correction map is listed, which is calculated by the angle deviation caused by the non-planarity of the window pane, which is a hypothetical light wave emitted by the lidar passing through the window pane. This angle correction map can then be used by the lidar to correct its estimate of the position of the object, knowing the emission angle and therefore the point of the window pane through which the light wave passed and which was reflected on the object.

[0017] The method according to the invention enables calibration before the LiDAR is installed, since the LiDAR does not need to emit light waves, which makes it possible to obtain the angle correction before the LiDAR is installed. Therefore, the method can be implemented by the supplier of the window glass, which can save the end user of the vehicle from a long and expensive calibration process. In addition, the method does not use tools that will be dedicated to obtaining the angle correction, but only uses other equipment known for the application.

[0018] In addition to the features just mentioned in the preceding paragraph, the method according to the first aspect of the invention may have one or more additional features among the following, which may be considered individually or in all technically possible combinations thereof.

[0019] According to the invention, the method advantageously also comprises a step of completing the angular correction map by calculating the vertical and horizontal angular offsets of a plurality of points of the window pane that do not belong to the set of points, the calculation being carried out from horizontal and vertical local slopes obtained by interpolation of the horizontal and vertical local slopes calculated from the set of points.

[0020] Therefore, even if the impact point of the light wave emitted by the lidar on the internal free surface does not coincide with the set of points, the angle correction map includes an angle correction for each impact point.

[0021] According to the invention, each point in a point set is preferably spaced no more than 1 mm from another point in the point set, or no more than 100 micrometers along a horizontal axis, and / or no more than 100 nanometers, or no more than 10 nanometers along a normal axis. The spacing may be regular or irregular, more or less dense.

[0022] Preferably, the set of points is chosen in such a way that all possible non-planarities of the window pane are covered.

[0023] According to the invention, the set of points is preferably selected so as to cover an area comprised in the glazing having a dimension along the horizontal axis of at least 1 cm and a dimension along the normal axis of at least 1 cm.

[0024] Therefore, the set of points is selected in a way that covers an area suitable for proper operation of the lidar.

[0025] In particular, the width of the area included in the glazing is at least of the order of centimeters and is preferably not greater than 25 cm or better still not greater than 15 cm and better still not greater than 5 cm.

[0026] Thus, the size of the area contained in the glazing may correspond to the size of the hole in the glazing (eg a hole in the inner glass of a laminated glazing as described later), for example at least 80 or 90% of the size of the hole.

[0027] According to one embodiment, the step of determining the local thickness is performed by measuring the thickness directly or by differentiation of a first surface measurement carried out on the inner free surface of the glazing and a second surface measurement carried out on the outer free surface of the glazing.

[0028] According to an alternative to the aforementioned embodiment, the step of determining the local thickness is carried out by contactless optical measurement.

[0029] According to a variant of the preceding embodiment, the step of determining the local thickness is performed by wavefront measurement, deflectometry or confocal profilometry.

[0030] According to a variant, the step of determining the local thickness is carried out by measuring the light transmission distortion.

[0031] The first step of the method is therefore carried out by means of a device commonly used for carrying out optical measurements, which can be used in many fields, such as a wavefront analyser.

[0032] According to the present invention, the vertical angle offset and the horizontal angle offset are preferably calculated by the following formula:

[0033]

[0034] For A vv , A hv , A vh , A hh , the coefficients depend on the vertical and horizontal components of the emission angle of the light wave intended to pass through the window glass at said point and at the inclination of the window glass.

[0035] Therefore, the vertical and horizontal angular offsets are calculated accurately enough to correct the position estimate of the object performed by the lidar.

[0036] These formulae correspond in particular to the refraction equation applied to the inside surface of the window pane and to a first order approximation of the refraction equation applied to the outside surface of the window pane, written as follows:

[0037]

[0038] in:

[0039] - , the vector that is orthogonal to the inner surface of the window glass at this point;

[0040] - , the vector that is orthogonal to the outer surface of the window glass at this point;

[0041] - , the direction of the light wave before passing through the window glass;

[0042] - , the direction of the light wave after passing through the inner surface of the window glass;

[0043] - , the direction of the light wave after passing through the inner surface of the window glass and then through the outer surface of the window glass;

[0044] -n, the refractive index of the window glass.

[0045] In particular, the coefficient A vv , Ahv , A vh , A hh In particular, the calculations can be performed analytically without having to solve the differential equations, for example using matrix computation tools such as NumPy or MATLAB.

[0046] According to the invention, the previously described steps (for calibrating the LiDAR) of determining the local thickness, obtaining the horizontal and vertical local slopes, calculating the vertical angular offset, calculating the horizontal angular offset and establishing an angle correction map and even the optional step of completing the angle correction map are implemented before installing the LiDAR by defining a theoretical reference point of the impact relative to the emission reference angle.

[0047] Once the LiDAR is calibrated, it is mounted and put into service (turned on), and the alignment is verified and recalibrated if necessary.

[0048] According to the invention, the method preferably comprises the step of forming a reference point on the inner free surface of the window pane in the form of a mark (or reference mark) corresponding to a theoretical reference point of the impact.

[0049] Therefore, the subsequent steps of alignment are facilitated.

[0050] According to a first embodiment, after the laser radar is installed, there is an offset between a reference point of a light wave emitted at a reference angle by the laser radar and an actual reference point of impact, and the method includes a step of aligning the actual reference impact point and the reference point.

[0051] Thus, the position of the LiDAR is adjusted so as to correspond to the reference position so as not to introduce an offset in the correction map of the angular error. A possible alignment step does not require additional complex tools or space, or even intervention. It can be done automatically.

[0052] According to one embodiment, the alignment step is performed by means of attaching the Lidar to the vehicle. The attachments are already marked so that once the Lidar is connected, the alignment is immediate.

[0053] According to a variation of the embodiment, if after installing the laser radar, there is an offset between the reference point of the light wave emitted at the reference angle emitted by the laser radar and the actual reference impact point, the method includes a step of recalibrating the angle correction map by applying a translation.

[0054] Therefore, the angle correction map is adapted to the actual position of the lidar so that the position of the lidar does not have to be modified.

[0055] In particular, the translation has a value equal to the difference between the position of a reference point and the position of a reference impact point on the inner free surface of the glazing.

[0056] According to the present invention, for a light wave with a given emission angle, the horizontal axis component x and the normal axis component y' of the window glass position of the light wave passing through a point on the window glass are calculated by the following formulas:

[0057] .

[0058] A second aspect of the invention relates to a vehicle window glass which is capable of allowing light waves emitted by a laser radar, in particular (closest to) infrared light, to pass therethrough, the window glass comprising a storage device configured to store an angle correction map established for the window glass by the method according to the first aspect of the invention.

[0059] According to an alternative embodiment, the storage means is a data matrix or a bar code linked to a database. For example, the storage means is for example in the form of a data matrix. The storage means may also be in the form of a bar code, such as a flash code, a TAG, a QR code linked to a database. Naturally, the storage means may be in another form, such as a hard disk, a storage server or an electronic memory.

[0060] Preferably, the storage device is on the window glass. It can be a deposit or a film (gluing).

[0061] The storage device (eg a layer) can in particular be printed on the window pane 201. Printing is carried out, for example, by etching and / or by inkjet printing.

[0062] This therefore makes it possible to provide the lidar with an appropriate angle correction map.

[0063] In particular, the storage device is transparent or visible under certain conditions and / or the window pane comprises an area covered by an opaque element and the storage device is situated in a mask formed in the area covered by the opaque element (in particular at the periphery, for example by way of an enamel masking strip or other opaque means, in particular black).

[0064] Therefore, the storage device is discrete.

[0065] According to the invention, the glazing is, for example, a laminated glazing comprising an outer glass, a laminating interlayer and an inner glass.

[0066] Therefore, light transmittance and safety are improved.

[0067] In particular, the laminated glazing comprises at least one through hole in the inner glass or even a hole in the lamination interlayer.

[0068] The aperture thus makes it possible to efficiently and selectively transmit and / or collect the set of light waves passing through the window pane.

[0069] A third aspect of the present invention relates to a system comprising a window pane according to the second aspect of the present invention and a laser radar configured to emit light waves passing through the window pane.

[0070] According to an alternative embodiment, the window pane comprises reference points in the form of markings.

[0071] Therefore, it is easier to adjust the position of the LiDAR during its installation or alignment steps.

[0072] A fourth aspect of the invention relates to a vehicle comprising a glazing according to the second aspect of the invention or a system according to the third aspect of the invention.

[0073] According to an alternative embodiment, the window pane is a windscreen.

[0074] The invention and its various applications will be better understood by reading the following description and examining the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] The drawings are provided for informational purposes and in no way limit the present invention.

[0076] - Figure 1 A schematic diagram shows a lidar that transmits light waves through a vehicle's window glass.

[0077] - Figure 2 A schematic diagram of a vehicle window is shown in cross section.

[0078] - Figure 3 A schematic cross-sectional view showing the path of light waves emitted by a lidar through a vehicle window.

[0079] - Figure 4 Given a window glass tilted 30° relative to the horizontal axis, the coefficient A based on the vertical component of the light wave emission angle and the horizontal component of the light wave emission angle is vv , A hv , A vh , A hh The value of .

[0080] - Figure 5 A schematic diagram of a set of points of a vehicle window pane is shown for which angular corrections have been calculated by the method according to the first aspect of the invention.

[0081] - Figure 6 is a block diagram illustrating a sequence of steps of a method according to a first aspect of the present invention.

[0082] - Figure 7 An example of the impact point of a light wave emitted by a lidar on the free surface inside a window glass is shown.

[0083] - Figure 8 A schematic diagram showing the alignment step of the method according to the first aspect of the present invention is shown.

[0084] - Fig. 9 A schematic diagram showing a front view of a window pane.

[0085] Detailed description

[0086] Unless stated otherwise, one and the same element appearing in different drawings has a unique reference label.

[0087] A first aspect of the invention relates to a method of determining an angular correction intended for use by a LiDAR.

[0088] Lidar is understood to be a device that makes it possible to assess the position of an object by emitting light waves towards the object and by measuring the round-trip propagation time of the light waves reflected from the object.

[0089] The wavelength of each light wave emitted by the laser radar preferably falls within the near infrared range, in particular within the range of 800 nm to 1800 nm, in particular 905 ± 5 nm and / or 1550 ± 5 nm and / or even 850 ± 5 nm. Preferably, the transmission coefficient at one or more wavelengths (of the laser radar) is at least 70% or 80%.

[0090] The LiDAR is intended to be installed inside a vehicle in such a way that the light waves emitted by the LiDAR pass through the vehicle's window glass before being reflected by the object whose position needs to be estimated by the LiDAR device. In other words, the LiDAR and the object whose position needs to be estimated by the LiDAR device are located on both sides of the vehicle's window glass.

[0091] By glazing is understood a pane formed from a transparent material such as glass or plastic. The pane forming the glazing may comprise a single sheet of transparent material or multiple sheets of transparent material; this is known as a laminated glazing.

[0092] The glazing is, for example, a laminated vehicle glazing (and preferably curved), in particular for road vehicles (cars, trucks, public transport: buses, cars, etc.) or railways (in particular with a maximum speed of not more than 90 km / h or not more than 70 km / h, in particular subways, trams), in particular a windscreen, or a rear window, and perhaps a side window, of a given thickness E1 (for example, sub-centimeter level, in particular not more than 5 cm), suitable for road vehicle windscreens, in particular cars.

[0093] The window glass comprises:

[0094] a first pane of glass, in particular curved, intended for use as an external glazing, having a first external main face F1 and a second internal main face F2 (facing the passenger compartment). If the vehicle is a car, its thickness is preferably not greater than 4 mm, and even not greater than 3 mm or 2.5 mm, in particular 2.1 mm, 1.9 mm, 1.8 mm, 1.6 mm and 1.4 mm, and preferably at least 0.7 mm, or 1 mm;

[0095] - a laminated interlayer (single or multilayer) of a polymeric material, which is optionally neutral, transparent, extra-transparent or pigmented, in particular grey or green, preferably a thermoplastic material, and more preferably polyvinyl butyral (PVB). If the vehicle is a road vehicle, its thickness E3 is not greater than 1.8 mm, preferably not greater than 1.2 mm and even not greater than 0.9 mm (and preferably at least 0.3 mm and even at least 0.6 mm). The laminated interlayer is optionally acoustic and / or optionally has a cross-section that decreases in shape from the upper corner to the bottom of the laminated glazing (in particular a windshield), in particular for a head-up display (HUD). The laminated interlayer has a main face FA facing F2 and a main face FB opposite FA;

[0096] - A second pane of glass or plastic, preferably curved and in particular tinted, intended for use as an interior glazing, having, next to F2, a third main face F3 and a fourth inner main face F4 (towards the passenger compartment). If the vehicle is a road vehicle, its thickness E2 is preferably less than that of the first pane, even not greater than 3 mm or 2 mm, in particular 1.9 mm, 1.8 mm, 1.6 mm and 1.4 mm, or even not greater than 1.3, and preferably at least 0.7 mm, the thickness of the first and second panes being preferably strictly less than 5 or 4 mm, even less than 3.7 mm.

[0097] For example, the total iron oxide content of the first plate is no greater than 0.05% by weight.

[0098] In particular, the second pane is capable of (significantly) absorbing near infrared light, for example the second pane is glass and has a total iron oxide content of at least 0.4% by weight.

[0099] Furthermore, the second plate has through holes in thickness, in particular a trapezoidal or rectangular or circular cross section for better mechanical strength, in particular a width W1 of at least centimeters, and preferably not more than 25 cm or preferably not more than 15 cm, even more preferably not more than 5 cm.

[0100] Optionally, the laminate interlayer (colorless, etc.) has partial holes or through-holes in thickness, preferably at least such that the holes extend through the second sheet, optionally wider, in particular not more than 10 mm, or narrower, not more than 3 mm or 1 mm, in particular trapezoidal, or rectangular or circular, etc. cross-section (in particular having the same or even similar shape as the part of the hole through the glass).

[0101] The shape and size of the through-holes are configured according to the art so as to transmit and effectively and selectively collect all rays passing through the window glass.

[0102] For example, the hole has the same shape as the lidar.

[0103] The holes (open or closed) can in particular have a convex cross section, particularly preferably a trapezoidal one, or a circular one, or an elliptical one, or an oval one, or even a rectangular one, a square one.

[0104] The hole specifically has a size defined by the field of view of the lidar based on the positioning of the lidar.

[0105] The hole through the second plate can be occupied freely or completely or partially, for example by a filling material transparent to the operating wavelength, and / or by the insertion of a part of the lidar.

[0106] Vias can be:

[0107] - closed (enclosed by the wall of the second panel), thus inside the window pane, in particular at least 3 cm or 5 cm from the closest edge face of the window pane;

[0108] - To open or open, forming a gap (periphery).

[0109] The glazing may comprise a general through hole comprising:

[0110] - a hole into a laminated interlayer (single or multi-layer) of width D1;

[0111] - and the holes enter into a second plate of width W1.

[0112] The axes of symmetry of the first and second holes coincide or nearly coincide and preferably have the same width (before and / or after lamination).

[0113] The through hole is intended to be positioned in the optical path of the LiDAR.

[0114] In areas without holes (especially the central area in the case of windshields), the light transmittance T of the laminated glazing is L Preferably at least 70% or 75%, 80% or 85%, 88%.

[0115] Through holes with constant or variable cross section, in particular trapezoidal or rectangular or disk-shaped or elliptical through holes, for example (diameter) smaller dimensions of at least 2 cm, 3 cm, 5 cm, and preferably larger dimensions of not more than 30 cm or 25 cm.

[0116] The glazing preferably comprises a peripheral opaque shielding layer, in particular an opaque peripheral shielding band, in particular black.

[0117] The opaque shielding layer is in particular in the form of at least one coating on one of the first and second panes and / or on the laminate interlayer.

[0118] This area is, for example, a rectangular strip along one edge of the window pane, in particular along the longitudinal edge of the windshield. This strip is in particular a band below the entire length of the edge and extends into the area (in particular the center) with the through hole.

[0119] The shielding layer can be on either side of the hole (closure), and even around the hole (closure).

[0120] Furthermore, the glazing may comprise a sheet (opaque) glued to face F4, comprising a hole, in particular to the right of said through hole (larger than the width of said through hole or in the extension direction of said through hole) of the inner glazing. If the glazing is perforated, in particular a plastic sheet, optionally reinforced, opaque, it has means capable of supporting or maintaining an infrared observation system of operating wavelength, such as a LiDAR.

[0121] In particular, in particular sub-centimeter thick sheets, in particular 1 to 3 mm, and even 1.5 to 2.5 mm, can be bonded to the surface F4. For example, it is optionally made of reinforced plastic (fibers, etc.), such as polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polyamide (PA66), acrylonitrile butadiene styrene (ABS) and its ABS-PC alloys, polystyrene (PS), acrylonitrile styrene acrylate (ASA) based on oxymethylene polymer (POM), polybrominated biphenyl (PBT), preferably reinforced with glass fibers for higher strength, in particular PA66 GF30 (30% glass fibers).

[0122] The plate can be used to support or help support or stabilize the laser radar. The plate has a hole on the right side of the through hole.

[0123] The sheet (perforated or non-perforated) can also be used in non-perforated (laminated) glazing.

[0124] Like the through hole, this plate is preferably peripheral, in particular at the upper border of the window pane. For example, it is located in the central area, ie the (conventional) area of ​​the rearview mirror (presence or absence).

[0125] If the hole is closed, the edge of the hole closest to the edge surface of the window pane (preferably the upper longitudinal edge, and especially in the central area) is spaced from the edge surface of the (second pane) window pane by at least 2 cm or 3 cm, and preferably 5 cm.

[0126] The through hole can be in the central area of ​​the upper longitudinal edge of the windshield, the usual area of ​​the interior rearview mirror (the area adjacent to the hole or rearview mirror is eliminated depending on the vehicle), the thickness of the shielding layer area on faces F2 and / or FA is generally greater than the thickness on the side areas along the upper edge (passenger, driver).

[0127] Preferably, the through-hole has a cross section which is in particular trapezoidal or circular or oval:

[0128] - at least a smaller dimension of 2, 3, 5, 8 cm (e.g., dimensions suitable for infrared vision systems), and preferably a larger dimension (especially a larger side or diameter) of not more than 40 cm, 30 cm, 20 cm (for mechanical purposes);

[0129] - And preferably, the anti-reflective coating occupies the surface surrounding the hole and has a length of no more than 30 cm.

[0130] In particular, the cross section of the through hole is quadrilateral, in particular rectangular or trapezoidal, wherein

[0131] - a first (large) side or longitudinal edge, called the upper edge (the portion closest to the upper longitudinal edge of the window pane), preferably parallel to the upper longitudinal edge of the window pane, preferably having a length not greater than 30 cm, 20 cm or 15 cm or 12 cm and in particular having a spacing of at least 5 cm or 6 cm from the edge face;

[0132] - a second (large) side or longitudinal edge, called the lower part (the part furthest from the part of the upper longitudinal edge of the window pane, closest to the central area), preferably parallel to the part of the upper longitudinal edge of the window pane and having a length preferably not greater than 35 cm or 30 cm or 25 cm or 20 cm, and preferably greater than the length of the first large side;

[0133] - The height (between the large sides) is preferably at least 5 cm and preferably not more than 15 cm.

[0134] If the hole is small, no larger than 10, 8, 5, 2 cm, it is preferred to make the hole circular.

[0135] The through holes are along the longitudinal edges, or alternatively, the through holes are along the transverse edges.

[0136] In the case of a rear window, the through-holes may be peripheral, along the longitudinal edges (particularly the upper part) or along the transverse edges.

[0137] The through hole has a given shape, in particular a shape with a right convex cross section, such as a trapezoid or a rectangle or a circle or an ellipse. The anti-reflection coating may have a similar shape.

[0138] Of course, the interlayer may comprise a plurality of laminates of thermoplastic materials of different properties, for example with different hardnesses to provide an acoustic function, as described for example in publication US 6,132,882, in particular a set of PVB laminates with different hardnesses. Similarly, one of the glass laminates may be thin compared to conventionally used thicknesses.

[0139] According to the invention, the interlayer may have a wedge shape, in particular with regard to HUD (Head Up Display) applications. One of the layers of the interlayer may also be colored in the body.

[0140] As common lamination interlayers, in addition to PVB, flexible polyurethane PU, thermoplastics without plasticizers, such as ethylene-vinyl acetate copolymer (EVA), ionomer resins can also be mentioned. The thickness of these plastics is, for example, between 0.2 mm and 1.1 mm, especially between 0.3 mm and 0.7 mm.

[0141] The lamination interlayer may contain another functional plastic film (transparent, clear or colored), for example a polyethylene terephthalate PET film support for a layer of non-thermal, conductive, etc., such as PVB / functional film / PVB between faces F2 and F3.

[0142] At least one of the first and second panes (preferably the external pane) may be tinted, and the laminated glazing may also comprise a layer reflecting or absorbing solar radiation, preferably on face F4 or on faces F2 or F3, in particular a transparent conductive oxide layer, called “TCO layer” (on face F4), or even a thin-layer stack comprising at least one TCO layer, or a thin-layer stack comprising at least one silver layer (on F2 or F3), the or each silver layer being situated between dielectric layers.

[0143] The layers (silver) on faces F2 and / or F3 and the TCO layer on face F4 may be combined.

[0144] The TCO layer (of a transparent conductive oxide) is preferably a fluorine-doped tin oxide (SnO 2 :F) layer or a mixed indium tin oxide (ITO) layer.

[0145] Preferably, no solar radiation-reflecting or solar radiation-absorbing layers are present in the region for the lidar and, therefore, in the case of a window pane with a hole, no solar radiation-reflecting or solar radiation-absorbing layers are present facing the through hole.

[0146] The glass article can therefore include a functional coating on the surface F2, which is a non-thermal functional layer, in particular electrically conductive, optionally heated, in particular a silver stack, which, if desired, is not present in the area of ​​the lidar, in particular at the edges of the through-hole, at least in the central area and between the faces F2 and FA.

[0147] The interlayer (or any other polymer film) may comprise metal wires, in particular heated on a surface, in particular heated (surface FB, surface FA, etc.), in particular fixed on a surface and present or, if necessary, not present in the area for the lidar, in particular facing said through-holes of the second glass sheet (if any).

[0148] The heating wire has in particular a thickness less than or equal to 0.1 mm and is preferably copper, tungsten, gold, silver or aluminum or an alloy of at least two of these metals.

[0149] In one embodiment, the heating zone of the glazing (optionally locally, facing said through-holes of the second glass sheet) comprises a plurality of individual metal wires, called "heating wires", which connect the busbars to one another. A heating current flows through these individual metal wires. The wires are advantageously very thin so as not to impair or only slightly impair the transparency of the glazing. Preferably, the thickness of the metal wire is less than or equal to 0.1 mm, in particular between 0.02 and 0.04 mm and ideally between 0.024 mm and 0.029 mm. The metal wire preferably comprises copper, tungsten, gold, silver or aluminum or an alloy of at least two of these metals. The alloy may also comprise molybdenum, rhenium, osmium, iridium, palladium or platinum. The metal wire is preferably electrically insulating.

[0150] For the glass of the first glass pane and / or the second glass pane, preferably soda-lime-silica type glass is used.

[0151] The first glass pane (outer glass), in particular silica-based, soda-lime-based, soda-lime-silicon-based (preferred) or aluminosilicate-based or borosilicate-based, has a total content by weight of iron oxide (expressed in the form of Fe2O3) of not more than 0.05% (500 ppm), preferably not more than 0.03% (300 ppm) and not more than 0.015% (150 ppm), in particular greater than or equal to 0.005%.

[0152] The second glass pane (inner glass, in particular perforated), in particular silica-based, soda-lime-based, preferably soda-lime-silicon-based (like the first glass pane), or even aluminosilicate- or borosilicate-based, has a total weight content of iron oxide (expressed in the form of Fe2O3) of at least 0.4%, and preferably not more than 1.5%.

[0153] In one configuration, the first plate is of mineral glass, and the second plate is of plastic, such as a thinner (film) or the like, such as PC, PMMA, PET.

[0154] The second glass or plastic plate is in particular green, blue or grey. The second glass plate can be made of Fe2O3 for green, or of CoO and Se for blue, or of Se and CoO for grey.

[0155] Particular mention may be made of the applicant's glasses known as TSA nx (iron content of 0.5 to 0.6%) TSA2+, TSA3+ (iron content of 0.8 to 0.9%), TSA4+ (iron content of 1%), TSA5+, e.g. green.

[0156] For example, TSA3+ (2.1mm) has a total transmission of approximately 40% at 905mm and a total transmission of approximately 50% at 1550mm.

[0157] The second glass sheet, in particular the perforated one, may have a redox degree defined as the ratio between the weight content of FeO (ferrous iron) and the total weight of iron oxide (expressed as Fe2O3) of between 0.22 and 0.35 or 0.30.

[0158] The second glass sheet, in particular the one with holes, may have a chemical composition consisting of the following composition, the contents of which vary within the weight limits defined below:

[0159]

[0160] - Fe2O3 (total iron) is at least 0.4%, even 0.4 to 1.5%,

[0161] - Optional redox degree 0.22-0.3%

[0162] - and in particular less than 0.1% impurities.

[0163] The inner glass and / or the outer glass may have undergone a chemical or thermal treatment of the hardening or annealing type or tempering (in particular to obtain better mechanical strength) or be semi-tempered.

[0164] The glass of the first glass sheet and / or the second glass sheet is preferably of the float glass type, that is to say obtainable by pouring molten glass onto a bath of molten tin (known as a "float" bath). The terms "atmosphere" and "tin" faces are understood to mean those faces in contact with the atmosphere in the float bath and with the molten tin, respectively. The tin face contains a small amount of surface tin which diffuses into the structure of the glass.

[0165] The surface F2 can be a "tin" surface or an "atmosphere" surface.

[0166] The first glass plate can be, for example, soda-lime-silica glass, such as Saint-Gobain Glass's Diamant® or Pilkington's Optiwhite®, or Schott's B270®, or AGC's Sunmax® or other compositions disclosed in document WO04 / 025334. Planiclear® glass from Saint-Gobain Glass can also be selected.

[0167] For common natural raw materials, the total weight content of iron oxide is about 0.1% (1000ppm).

[0168] The Fe2O3 content (total iron) of the first glass sheet is preferably less than 0.015%, even less than or equal to 0.012%, especially 0.010%, to increase the near infrared transmittance of the glass. The Fe2O3 content is preferably greater than or equal to 0.005%, especially 0.008%, so that the cost is favorable.

[0169] To further increase the infrared transmittance of the first glass sheet, the ferrous content can be reduced in favor of ferric iron, thereby oxidizing the iron present in the glass. Therefore, it is desirable to have a glass with a redox degree as low as possible, ideally zero or close to 0. This number can vary between 0, corresponding to a completely oxidized glass, and a zero redox degree of 0.9.

[0170] Glasses containing small amounts of iron oxide, particularly less than 200 ppm, or even less than 150 ppm, have a natural tendency to have a high degree of redox greater than 0.4, or even 0.5. This tendency may be due to a shift in the redox equilibrium of iron based on the iron oxide content.

[0171] The redox degree of the first glass sheet is preferably greater than or equal to 0.15 and in particular between 0.2 and 0.30, in particular between 0.25 and 0.30. In practice, a too low redox degree can reduce the service life of the furnace.

[0172] In the first and even in the second plate, the silicon dioxide SiO2 is usually maintained within a narrow range for the following reasons. Above 75%, the viscosity of the glass and its devitrification capacity increase greatly, which makes melting and pouring the glass onto a molten tin bath more difficult. Below 60%, especially 64%, the hydrolysis resistance of the glass decreases rapidly. Preferred contents are 65 to 75%, especially 71 to 73%.

[0173] The first glass sheet may have a chemical composition comprising the following components, the contents of which vary within the weight limits defined below:

[0174]

[0175] -Redox degree 0.1-0.3.

[0176] Throughout the text, percentages are by weight.

[0177] The glass sheet is preferably formed by floating on a tin bath. Other types of forming methods may be used, such as a stretching method, a down-stretching method, a laminating method, a Fourcault method.

[0178] Apart from the unavoidable impurities contained in particular in the raw materials, the glass composition of the first glass sheet may contain small proportions (maximum 1%) of other components, such as reagents that help melt or refine the glass (Cl ...), or elements that are dissolved in the refractory materials used in the construction of the furnace (such as ZrO2). For the reasons already mentioned, the composition according to the invention preferably does not contain oxides such as Sb2O3, As2O3 or CeO2.

[0179] The composition of the first glass sheet preferably does not contain any infrared absorbers (in particular for wavelengths between 800 and 1,800 nm). In particular, the composition according to the invention preferably does not contain any of the following agents: oxides of transition elements, such as CoO, CuO, Cr2O3, NiO, MnO2, V2O5, rare earth oxides such as CeO2, La2O3, Nd2O3, Er2O3, or colorants in the elemental state, such as selenium, silver, copper. Among other agents, the oxides of the following elements are also preferably excluded: Sc, Y, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb, Lu. These agents generally have a very strong, undesirable coloring effect and are present in very small amounts, sometimes in the order of a few ppm or less (1 ppm = 0.0001%). As a result, their presence greatly reduces the transmittance of the glass.

[0180] Preferably, the first glass sheet has a chemical composition comprising the following components, the amounts of which vary within the weight limits defined below:

[0181]

[0182]

[0183] -Redox degree 0.12-0.30.

[0184] The first glass sheet may have a chemical composition comprising the following components, the contents of which vary within the weight ranges defined below:

[0185]

[0186] -Redox degree 0.15-0.3.

[0187] In the present invention, in order to increase the near-infrared transmittance of the glass, the Fe2O3 content (total iron) is preferably less than 0.015%, even less than or equal to 0.012%, especially 0.010%. The Fe2O3 content is preferably greater than or equal to 0.005%, especially 0.008%, so that the cost of the glass is favorable.

[0188] The redox degree is preferably greater than or equal to 0.15, and in particular between 0.2 and 0.30, in particular between 0.25 and 0.30. In fact, too low a redox degree can reduce the service life of the furnace.

[0189] In the first and second sheets, the silicon dioxide SiO2 is usually maintained within a narrow range for the following reasons. Above 75%, the viscosity of the glass and its devitrification ability are greatly increased, which makes melting and pouring the glass into a molten tin bath more difficult. Below 60%, especially 64%, the hydrolysis resistance of the glass decreases rapidly. The preferred content is 65 to 75%, especially 71 to 73%.

[0190] [ Figure 2 ] Figure 2 A schematic diagram of a cross-sectional view of a window pane 201 is shown.

[0191] The window glass 201 includes an inner free surface 2011 and an outer free surface 2012, the thickness of the separation between the inner free surface 2011 and the outer free surface 2012 can be locally varied, the inner free surface 2011 is positioned toward the inside of the vehicle, and the outer free surface 2012 is positioned toward the outside of the vehicle. Therefore, the light wave emitted by the laser radar first passes through the inner free surface 2011 of the window glass 201, and then passes through the outer free surface 2012 of the window glass 201. For a given light wave, the point of the inner free surface 2011 through which the light wave passes is called the impact point.

[0192] [ Fig. 9 ] Fig. 9 A schematic diagram showing a front view of an example of a window glass 201. Fig. 9 In FIG. 2 , the window glass 201 is a windshield of a road vehicle.

[0193] Reference Fig. 9 , the windshield 201 comprises a glass sheet 11 and an opaque element 12. The opaque element 12 makes it possible in particular to hide vehicle elements arranged inside the vehicle from the outside of the vehicle. For example, part of a laser radar device. The opaque element 12 covers at least one of the main surfaces of the glass sheet 11 in a bordered manner with the entire windshield 10. The opaque element 12 can be arranged on only one of the two main surfaces of the glass sheet 11 or it can include several parts, each of which is arranged on either side of the main surface of the glass sheet 11. In the case where the multi-layer glazing comprises several glass sheets, such as the laminated glazing described above, the opaque element 12 can also be formed by several parts, each of which is arranged on the surface of two or more glass sheets according to the number of parts. In addition, the glass sheet 11 can be inclined, for example, at an angle of 30°. In addition, the glass sheet 11 can be bent along one or two axes, with a radius of curvature, for example, between 6m and 30m.

[0194] Preferably, the opaque element 12 is an enamel layer deposited on the surface of the plate 11. Naturally, the enamel layer may be replaced by any other opaque element arranged inside a road vehicle capable of hiding certain elements from the outside.

[0195] In addition, if Figure 1 As shown, the opaque element 12 defines a given area 13 of the glass sheet 11, which is located at the upper boundary of the windshield 10, such as the peripheral central area. The given area 13 (called the LiDAR area 13) is intended to be placed on the wave path of the LiDAR device. Preferably, the surface area of ​​the given area 13 is less than 0.5 m 2 .

[0196] Because the window glass 201 has non-planarity, the path of the light waves emitted by the LiDAR is deviated through the LiDAR region 13 of the window glass 201. The angle correction determined by the method according to the first aspect of the invention is intended to be used by the LiDAR to take into account the deviation caused by the window glass 201 to the light waves emitted by the LiDAR in order to correctly assess the position of the object.

[0197] [ Figure 1 ] Figure 1 A schematic diagram of a lidar 202 emitting light waves through a vehicle window glass 201 is shown.

[0198] The window glass 201 is inclined at an angle θ relative to a horizontal plane P including the horizontal axis X and perpendicular to the vertical axis Y. The angle θ is, for example, between 0° and 90°, and preferably between 21° and 36°, and when the window glass 201 is a windshield, it is 30° on average.

[0199] The window pane 201 , in particular the inner free surface 2011 , defines a surface plane including a horizontal axis X and a normal axis Y′ perpendicular to the horizontal axis X. The vertical axis Y is not included in the surface plane.

[0200] exist Figure 1 , the laser radar 202 transmits light waves at an emission angle α to the window glass 201. The diamonds shown on the window glass 201 correspond to the points of the window glass 201 through which the light waves emitted by the laser radar 202 at a zero emission angle α pass.

[0201] The emission angle α includes a horizontal component α along the horizontal axis X h and the vertical component α along the vertical axis Y v .

[0202] [ Figure 6 ] Figure 6 is a block diagram illustrating a sequence of steps of a method 100 according to the first aspect of the present invention.

[0203] For each point of the set of points of the glazing 201 , the first step 101 of the method 100 consists in determining the local thickness of the glazing 201 at said point.

[0204] The “local thickness of the window pane at a point” is understood to be the thickness between the inner free surface 2011 and the outer free surface 2012 at said point.

[0205] [ Figure 5 ] Figure 5 A schematic diagram of a window pane 201 is shown, on which a point 2031 of a set of points 2031 is shown.

[0206] exist Figure 5 In FIG. 2 , each point 2031 of the point set 2031 is represented by a black circle.

[0207] For example, point set 2031 is selected to cover a specific area 2030 of window glass 201 .

[0208] The region 2030 is, for example, rectangular, with a dimension along the horizontal axis X of at least 1 centimeter and a dimension along the normal axis Y′ of at least 1 centimeter.

[0209] For example, the point sets 2031 are selected in such a way that two points 2031 of adjacent point sets 2031 are spaced at least 100 μm apart along the horizontal axis X and / or at least 10 nm apart along the normal axis Y′.

[0210] The set of points 2031 may also be selected based on the types of defects commonly encountered in the window glass 201 .

[0211] The first step 101 is implemented by measuring the thickness directly at said point 2031 , or by differentiating a first surface measurement made on the inner free surface 2011 of the window pane 201 at said point 2031 and a second surface measurement made on the outer free surface 2012 of the window pane 201 at said point 2031 .

[0212] The first step 101 is implemented, for example, by wavefront measurement. For this purpose, a light wave transmitter is used which includes a wavefront analyzer, also called an aberrometer, which allows the shape of the wavefront of the light wave emitted by the transmitter to be measured and the deformations experienced by the wavefront as it passes through the window pane 201 to be determined. It will be remembered that a wavefront is a three-dimensional wave surface, defined in such a way that each light wave coming from the same source is orthogonal to the wavefront.

[0213] Therefore, the transmitted wavefront, i.e., the phase difference between the wavefront of the light wave that has passed through the window glass 201 and the wavefront of the emitted light wave, is calculated to determine the wavefront error, which is converted into a deviation of the transmitted wavefront and the local thickness can be obtained at the position where the light wave passes through the window glass 201.

[0214] The first step 101 can be implemented by other non-contact optical measurement methods, such as deflectometry or confocal profilometry. The first step 101 can also be implemented by light transmission distortion measurement.

[0215] Figure 2 As shown, the second step 102 of the method 100 is to calculate the horizontal local slope εh at the point 2031, which corresponds to the component of the difference ε between the local thickness and the thickness e that the window glass 201 should have along the horizontal axis X, and the vertical local slope εv at the point 2031, which corresponds to the component of the difference between the local thickness and the thickness e that the window glass 201 should have along the normal axis Y'.

[0216] The second step 102 is implemented by digital processing.

[0217] The third step 103 of the method 100 consists in determining the vertical component α of the emission angle α of the light wave intended to pass through the window pane 201 at the point 2031. v , based on the vertical local slope ε at the point 2031 v and the vertical angle deviation δ is calculated based on the inclination θ of the window glass 201 v .

[0218] The fourth step 104 of the method 100 consists in determining the horizontal component α of the emission angle α of the light wave intended to pass through the window pane 201 at the point 2031. h , based on the horizontal local slope ε at the point 2031 h and calculating the horizontal angle deviation δ based on the inclination θ of the window glass 201 h .

[0219] [ Figure 3 ] Figure 3 A schematic diagram is shown of the path of a light wave emitted by a laser radar 202 through a window glass 201 in a plane perpendicular to the surface plane. Since the surface plane contains the horizontal axis X, Figure 3 Only the vertical component can be seen in the image.

[0220] exist Figure 3 In the example, the refractive index of the window glass 201 is , which corresponds to the direction of the light wave before it passes through the window glass 201, that is, according to the emission angle Along the direction of the light wave after passing through the inner free surface 2011 of the window glass 201, and The direction of the light wave after passing through the outer free surface 2012 of the window glass 201 after passing through the inner free surface 2011 of the window glass 201.

[0221] After it passes through the window glass 201, the light wave has deviated from the vertical axis Y by an angle δ v ,like Figure 3 As shown, and deviates from the horizontal axis X by an angle δ h (Not shown in the figure).

[0222] The third step 103 and the fourth step 104 are implemented by applying the refraction equation to the inner free surface 2011 of the window pane 201, on the one hand, and to the outer free surface 2012 of the window pane 201, on the other hand. The following is obtained:

[0223]

[0224] and:

[0225] - , a vector which is orthogonal to the inner free surface 2011 of the window glass 201 at said point 2031;

[0226] - , a vector which is orthogonal to the external free surface 2012 of the window glass 201 at said point 2031 .

[0227] By making a first order approximation by the refraction equation applied to the inner free surface 2011 of the window glass 201 studied at (1) and the refraction equation applied to the outer free surface 2012 of the glass 201 at (1), we obtain:

[0228]

[0229] For A vv , A hv , A vh , A hh , the coefficient depends on the vertical component α of the emission angle α of the light wave intended to pass through the window glass 201 at said point 2031 and at the inclination θ of the window glass 201 v and the horizontal component α h .

[0230] Coefficient A vv , A hv , A vh , A hh is computed analytically using matrix computation tools such as NumPy or MATLAB without solving differential equations.

[0231] For example, in the case of a non-tilted window pane 201 with a tilt angle of 0°, for a zero emission angle α, we obtain:

[0232]

[0233] For example, in the case of a tilted glazing 201 with a tilt angle θ, for a zero emission angle α, we obtain:

[0234] .

[0235] [ Figure 4 ] Figure 4 Given that, for a window glass 201 tilted 30° relative to the horizontal axis X, the vertical component α based on the emission angle α v and the horizontal component α based on the launch angle α h The coefficient A vv , A hv , A vh , A hh The value of .

[0236] The fifth step 105 of the method 100 is to create an angle correction map. For each point 2031 in the point set 2031, the angle correction map includes the vertical angle offset δv and the horizontal angle offset δh calculated for the point 2031 in the third step 103 and the fourth step 104 of the method 100.

[0237] The method 100 may also comprise an additional step 1051, which consists in calculating the vertical angular offset δ of several points of the window glass 201 that do not belong to the point set 2031. v and horizontal angle deviation δ h to complement the angle correction map. For example, by calculating the horizontal local slope ε for each of these points h and the vertical local slope εv, which is the horizontal local slope ε calculated by the point set 2031 h and the vertical local slope ε v Interpolation is performed and then the vertical angle offset δ of the point completed in the third step 103 and the fourth step 104 of the method 100 is obtained. v and horizontal angle deviation δ h Perform calculations.

[0238] This step 1051 is particularly relevant when the point set 2031 does not coincide with the set of impact points of the lidar 202 , so as to be able to correct the estimate of the lidar 202 at each impact point 2032 .

[0239] [ Figure 7 ] Figure 7 An exemplary set of impact points 2032 for the laser radar 202 is shown. Figure 5 The point set 2031 shown establishes an angle correction diagram, and the impact point 2032 is inconsistent with the point set 2031.

[0240] The relationship between the position of a point on the window glass 201, and in particular the coordinates (x; y') along the horizontal axis X and the normal axis Y', respectively, and the emission angle α can be expressed as:

[0241] .

[0242] The first step 101, the second step 102, the third step 103, the fourth step 104 and the fifth step 105 and the finishing step 1051 may be performed before installing the laser radar 202. In this case, a theoretical reference impact point is defined. The theoretical reference impact point and the reference emission angle α ref Related. Reference emission angle α ref Preferably equal to 0.

[0243] The method 100 comprises, for example, a step 1060 of forming a reference point on the inner free surface 2011 in the form of a marking corresponding to a theoretical reference point of a defined impact.

[0244] [ Figure 8 ] Figure 8 A schematic diagram of a window glass 201 is shown, on which a reference point O is marked with a black cross. ref .

[0245] After installing the laser radar 202, if the reference point O ref With the actual reference impact point O LiDAR There is an offset between the reference emission angle α and the reference emission angle α. ref The impact point 2032 of the emitted light wave on the internal free surface 2011, the method 100 includes setting the actual reference impact point O LiDAR and reference point O ref A step 1061 of aligning, or a step 1062 of recalibrating the angle correction map by applying a translation v to each point of the angle correction map.

[0246] like Figure 8 As shown, for example, the translation v has a value equal to the reference point O on the inner free surface 2011 of the window glass 201. ref The position and reference impact point O LiDAR The value of the difference between the positions is represented by a white cross.

[0247] The alignment step 1061 is implemented, for example, via a device for attaching the lidar 202 to the vehicle.

[0248] Step 1060 of forming reference points may be performed at any time before step 1061 or step 1062 of aligning.

[0249] A second aspect of the present invention relates to a vehicle window glass 201 which is capable of allowing light waves emitted by a laser radar 202 to pass through.

[0250] The window glass 201 includes Figure 1 The storage device 2014 is shown. The storage device 2014 is configured to store the angle correction map established during the fifth step 105 via the method 100 according to the first aspect of the present invention, which angle correction map is optionally completed in the completion step 1051.

[0251] The storage device 2014 may also store other information about the window glass 201 , such as its composition, manufacturing date or tilt angle θ, or information related to the vehicle, such as the vehicle model.

[0252] The storage device 2014 is, for example, in the form of a data matrix. The storage device 2014 may also be in the form of a barcode, such as a flash code, TAG, QR code linked to a database. Naturally, the storage device 2014 may be in another form, such as a hard disk, a storage server or an electronic memory.

[0253] Any known suitable encryption algorithm may be used to encrypt the data stored in the storage device 2014. A specific reader may then be used to unlock the storage device 2014 and access at least a portion of the data it contains.

[0254] The storage device 2014 can be on the window pane 201 and in particular printed on the window pane 201. The printing is performed, for example, by etching and / or by inkjet printing.

[0255] For the sake of caution, the storage device 2014 is transparent or visible under certain conditions, such as transparent or visible at a certain angle, and Figure 1 Shown on clear glass.

[0256] The storage device 2014 is located, for example, in a covering made in the region of the window pane 201 covered by the opaque element 12, such as Fig. 9 shown.

[0257] A third aspect of the invention relates to a system associating a window pane 201 according to the second aspect of the invention and a laser radar 202 configured to emit light waves passing through the window pane 201 .

[0258] The window pane 201 may then include reference points Oref in the form of markings, for example on its inner free surface 2011. The markings may be permanent (deposited, printed, enameled, screen-printed dots, etc.) or temporary, such as stickers, which may be removed after the alignment step 1061.

[0259] A fourth aspect of the invention relates to a vehicle comprising a glazing 201 according to the second aspect of the invention or a system according to the third aspect of the invention.

Claims

1. A method (100) for analyzing a window glass of a vehicle for correction, the method being intended for a laser radar (202) configured to emit light waves, the window glass (201) comprising an inner free surface (2011) facing the interior of the vehicle, and an outer free surface (2012) facing the exterior of the vehicle, each light wave being intended to pass through the window glass (201) and being defined by a given impact point (2032) on the inner free surface, the inner free surface defining a surface plane having a given inclination (θ) relative to a horizontal plane (P) having a horizontal axis (X), the horizontal axis (X) being perpendicular to a vertical axis (Y) and to a normal axis (Y') included in the surface plane, the method comprising the following steps: - For each point (2031) of the set of points (2031) of the window glass (201): o determining the local thickness of the window glass (201) at said point (2031); ○ The horizontal local slope (ε) at the point (2031) is obtained from the local thickness at the point (2031) by digital processing. h ) and the local slope of the vertical part (ε v ); o Based on the vertical component (α) of the emission angle (α) of the light wave intended to pass through the window glass (201) at said point (2031) v ), the vertical local slope (ε v ) and the inclination (θ) of the window glass (201) to calculate the vertical angle deviation (δ v ); o Based on the horizontal component (α) of the emission angle (α) of the light wave intended to pass through the window glass (201) at said point (2031) h ), the horizontal local slope (ε h ) and the inclination (θ) of the window glass (201) to calculate the horizontal angle deviation (δ h ); - establishing an angle correction map, which, for each point (2031) in the point set (2031), comprises a vertical angle offset (δ v ) and horizontal angular deviation (δ h ).

2. The method (100) according to claim 1, characterized in that: It also includes calculating the vertical angular displacement (δ) of a plurality of points in the window glass (201) that do not belong to the point set (2031) v ) and horizontal angular deviation (δ h ) to complete the step (1051) of the angle correction diagram, according to the horizontal local slope (ε h ) and the vertical local slope (ε v ) is calculated by calculating the horizontal local slope (ε) calculated from the set of points (2031) h ) and the vertical local slope (ε v ) is obtained by interpolation.

3. The method (100) according to any one of the preceding claims 1-2, characterized in that The spacing between each point (2031) in the point set (2031) and another point (2031) in the point set (2031) is no greater than 1 mm, or no greater than 100 microns along the horizontal axis (X), and / or no greater than 100 nanometers, or no greater than 10 nanometers along the normal axis (Y').

4. The method (100) according to any one of the preceding claims 1-2, characterized in that The set of points (2031) is selected to cover an area (2030) comprised in the window pane (201) having a dimension of at least 1 centimeter along the horizontal axis (X) and a dimension of at least 1 centimeter along the normal axis (Y').

5. The method (100) according to any one of the preceding claims 1-2, characterized in that The step of determining the local thickness is performed by measuring the thickness directly or by differentiating a first surface measurement performed on the inner free surface (2011) of the window glass (201) and a second surface measurement performed on the outer free surface (2012) of the window glass (201).

6. The method (100) according to claim 5, characterized in that: The step of determining the local thickness (101) is performed by non-contact optical measurement.

7. The method (100) according to claim 6, characterized in that: The step (101) of determining the local thickness is performed by wavefront measurement, deflection or confocal profilometry.

8. The method (100) according to claim 5, characterized in that: The step (101) of determining the local thickness is performed by light transmission distortion measurement.

9. The method (100) according to any one of the preceding claims 1-2, characterized in that The vertical angle offset δ is calculated by the following formula: v and the horizontal angle offset δ h : For A vv ,A hv ,A vh ,A hh , the coefficient depends on the vertical component α of the angle of emission α of the light wave intended to pass through the window glass (201) at said point (2031) and at the inclination θ of the window glass (201) v and the horizontal component α h .

10. The method (100) according to claim 9, characterized in that: The coefficient A vv ,A hv ,A vh ,A hh Calculated by analytical methods.

11. The method (100) according to any one of the preceding claims 1-2, characterized in that The steps of determining local thickness, obtaining horizontal and vertical local slopes, calculating vertical angular offset, calculating horizontal angular offset and establishing an angle correction map and even the optional step (1051) of completing the angle correction map are performed before installing the laser radar (202) by defining a reference angle (α) with respect to the emission. ref ) is implemented based on the theoretical reference point of the shocks associated with it.

12. The method according to claim 11, characterized in that The method comprises a step (1060) of forming a reference point (01060) on the inner free surface (2011) of the window pane (201) in the form of a mask corresponding to a theoretical reference point of the impact. ref ).

13. The method (100) according to claim 12, characterized in that: If after the laser radar (202) is installed, at the reference point (O ref ) and the actual reference point of the impact (O LiDAR ), the method (100) includes the step of: LiDAR ) and reference point (O ref ) alignment step (1061).

14. The method (100) according to claim 13, characterized in that: The alignment step (1061) is performed by attaching the laser radar (202) to a device on the vehicle.

15. The method (100) according to claim 12, characterized in that: If after the laser radar (202) is installed, at the reference point (O ref ) and the actual reference point of the impact (O LiDAR ), the method (100) includes a step (1062) of recalibrating the angle correction map by applying a translation (v).

16. The method (100) according to claim 15, characterized in that The translation (v) has a value equal to the reference point (O ref ) and the actual reference point of the impact (O LiDAR )’s position.

17. A vehicle window glass (201) capable of allowing light waves emitted by a laser radar (202) to pass therethrough, the window glass (201) comprising a storage device (2014) configured to store an angle correction map established by the method (100) according to any one of the preceding claims 1-16.

18. The window glass (201) according to claim 17, characterized in that The storage device (2014) is a data matrix or barcode linked to a database.

19. The window glass (201) according to any one of claims 17 or 18, characterized in that The storage device (2014) is on the window glass (201).

20. The window glass (201) according to claim 19, characterized in that The storage device (2014) is transparent or visible under certain conditions, and / or the window glass (201) includes an area covered by an opaque element (12), and the storage device (2014) is located in a concealment created in the covered area of ​​the opaque element.

21. The window glass (201) according to any one of claims 17 or 18, characterized in that The glazing (201) is a laminated glazing comprising an outer glass, a laminating interlayer and an inner glass.

22. The window glass (201) according to claim 21, characterized in that The glazing comprises at least one through hole in the inner glass.

23. The window pane (201) according to claim 17, wherein the light waves are infrared light.

24. The window glass (201) according to claim 20, characterized in that In clear view, the storage device (2014) is transparent or visible.

25. The window glass (201) according to claim 22, characterized in that The glazing comprises at least one tinted through-hole in the inner glass.

26. The window glass (201) according to claim 22, characterized in that It includes holes in the laminate interlayer.

27. A system comprising a window pane according to any one of claims 17 to 26 and a laser radar configured to emit light waves passing through the window pane (201).

28. The system according to claim 27, characterized in that The window pane (201) comprises a reference point (O ref ).

29. Vehicle comprising a glazing (201) according to any one of claims 17 to 26 or a system according to any one of claims 27 or 28.

30. The vehicle of claim 29, comprising a window glass (201) for a windshield.

Images