Vehicle system comprising a module for receiving a light beam

Abstract

The invention relates to a system (1) for a vehicle (2), which system comprises: - a module (11) for receiving a light beam (Fx'), said receiving module (11) comprising a photodetector (111), characterised in that: - (a) said receiving module (11) comprises two optical elements (110) configured to: - receive said light beam (Fx'), which is derived from an initial light beam (Fx) generated by an emitting module (10), - split said light beam (Fx') over a first wavelength range and over a second wavelength range, and - transmit, to said photodetector (111), said light beam (Fx') over a wavelength range (LP) comprised between 435 and 455 nanometres, and in that: - (b) said photodetector (111) is arranged so as to have maximum sensitivity in the blue wavelengths and is configured to convert said received light beam (Fx') into an electrical signal (7).

Description

Vehicle system comprising a module for receiving a light beam

[0001] The present invention relates to a vehicle system comprising a module for receiving a light beam. It finds a particular but non-limiting application in the detection of a target object located in front of a motor vehicle, or in the transmission of data from one motor vehicle to another or from a motor vehicle to a road infrastructure.

[0002] In the field of motor vehicles, a vehicle system, known to those skilled in the art, comprises a module for receiving a light beam which comprises at least one photodetector, the latter being configured to transform the light beam into a corresponding electrical signal. In the context of the detection of a target object, a computing unit is configured to detect the presence or absence of a target object from this electrical signal transmitted by said at least one photodetector. In the context of the transmission of data, a computing unit is configured to detect the transmitted data from this electrical signal transmitted by said at least one photodetector.

[0003] A disadvantage of this state of the art is that under certain conditions, the photodetector may experience a significant degradation in its signal-to-noise ratio. This is particularly the case under conditions of significant sunlight or ambient light. Indeed, under such conditions, the illumination of the sun or ambient light may cause saturation of the photodetector. The electrical signal (containing the information necessary for detecting a target object or for communicating with another vehicle or road infrastructure) transmitted by the photodetector will be drowned out by the noise generated by sunlight or ambient light.

[0004] In this context, the present invention aims to provide a configured vehicle system that solves the mentioned drawback.

[0005] To this end, the invention proposes a vehicle system comprising:- a module for receiving a light beam, said receiving module comprising at least one photodetector,Characterized in that:- (a) said receiving module further comprises at least two optical elements configured to:- receive said light beam from an initial light beam generated by a transmitting module,- cut said light beam over a first wavelength range and over a second wavelength range, and- transmit to said at least one photodetector said light beam over a wavelength range between 435 and 455 nanometers,and in that:- (b) said at least one photodetector is arranged so as to have maximum sensitivity in the blue wavelengths and is configured to receive said light beam over said wavelength range (LP) and to convert it into a corresponding electrical signal.

[0006] Thus, as we will see in detail later, the combination of filtering by the two optical elements and the use of a photodetector insensitive to infrared will make it possible to increase the signal-to-noise ratio of the light beam, the noise being sunlight.

[0007] According to non-limiting embodiments, said vehicle system may further comprise one or more additional characteristics taken alone or in all technically possible combinations, among the following.

[0008] According to a non-limiting embodiment, said at least one detector comprises a PN junction with a forbidden band between 3 electronvolts and 2.5 electronvolts.

[0009] According to a non-limiting embodiment,- one of the optical elements comprises a first lens and an associated low-pass filter configured to cut the light beam over the first wavelength range, and- the other of the optical elements comprises a second lens and an associated high-pass filter configured to cut the light beam over the second wavelength range.

[0010] According to a non-limiting embodiment,- one of the optical elements is a first lens with high-pass spectral absorption property configured to cut the light beam over the first wavelength range, and- the other of the optical elements is a second lens with low-pass spectral absorption property configured to filter the light beam over the second wavelength range.

[0011] According to a non-limiting embodiment, the first wavelength range is between 455 nanometers and 650 nanometers.

[0012] According to a non-limiting embodiment, the second wavelength range is between 380 nanometers and 435 nanometers.

[0013] According to a non-limiting embodiment, said system further comprises an emission module (10) comprising a light module configured to emit said initial light beam partly in visible light.

[0014] According to a non-limiting embodiment, said emission module further comprises a modulation unit configured to generate a modulated signal to control the emission of said initial light beam.

[0015] According to a non-limiting embodiment, said light module comprises at least one light source configured to emit said initial light beam to perform a photometric lighting and / or signaling or daytime running light function.

[0016] According to a non-limiting embodiment, said emission module is part of a headlight or a rear light of said vehicle.

[0017] According to a non-limiting embodiment, said light beam is a light beam reflected on at least one target object located in a field of vision of said initial light beam.

[0018] According to a non-limiting embodiment, said reception module further comprises a demodulation unit configured to demodulate the electrical signal and transmit said demodulated electrical signal to a calculation unit, and according to which said calculation unit is configured to, from said demodulated electrical signal, perform a correlation between said demodulated electrical signal and said modulated signal to deduce therefrom the presence of said at least one target object.

[0019] According to a non-limiting embodiment, said transmission module is part of another vehicle or road infrastructure.

[0020] According to a non-limiting embodiment, said light beam carries a sequence of data.

[0021] According to a non-limiting embodiment, said reception module further comprises a demodulation unit configured to demodulate the electrical signal and extract said data sequence therefrom to use it for communication with said other vehicle or said road infrastructure.

[0022] The invention and its various applications will be better understood by reading the following description and examining the accompanying figures:

[0023] illustrates a schematic architecture of a vehicle system according to a first non-limiting embodiment of the invention, said system comprising a reception module with at least two optical elements and at least one photodetector, said reception module being configured to receive a light beam from an initial light beam of a transmission module, the latter forming part of said system,

[0024] illustrates a schematic architecture of a vehicle system according to a second non-limiting embodiment of the invention, said system comprising a reception module with at least two optical elements and at least one photodetector, said reception module being configured to receive a light beam from an initial light beam of a transmission module, the latter being external to said system,

[0025] illustrates a schematic architecture of said at least two optical elements of the receiving module of the or of the, according to a first non-limiting embodiment,

[0026] illustrates a schematic architecture of said at least two optical elements of the receiving module of the or of the, according to a second non-limiting embodiment,

[0027] schematically illustrates a PN junction of said at least one photodetector of the or of the, according to a non-limiting embodiment,

[0028] schematically and partially illustrates an intensity spectrum of the light of a light beam generated by the receiving module of the or of the, said intensity spectrum being superimposed on a solar irradiance spectrum.

[0029] Identical elements, by structure or function, appearing in different figures retain, unless otherwise specified, the same references.

[0030] The vehicle detection system 1 according to the invention is described with reference to Figures 1 to 6. In a non-limiting embodiment, the vehicle 2 is a motor vehicle. By motor vehicle is meant any type of thermal or electric vehicle. This embodiment is taken as a non-limiting example in the remainder of the description. In the remainder of the description, the vehicle 2 is thus otherwise called motor vehicle 2.

[0031] As illustrated in Figures 1 and 2, the system 1 comprises a receiving module 11.

[0032] In a first non-limiting embodiment illustrated in the, the system 1 further comprises a transmission module 10. In this case, the reception module 11 and the transmission module 10 are part of a front headlight or a rear light of the motor vehicle 2. In this case, in a non-limiting example, the system 1 is used for the detection of a target object 3.

[0033] In a second non-limiting embodiment illustrated in the, the system 1 does not comprise the transmission module 10. In this case, the transmission module 10 is part of another vehicle 4 or of a road infrastructure (not illustrated). In this case, in a non-limiting example, the system 1 is used for the transmission of data from the motor vehicle 2 to another vehicle 4 or to a road infrastructure. In the, the non-limiting example of another vehicle 4 has been illustrated. It can be replaced by a road infrastructure.

[0034] In a non-limiting embodiment, the front headlight or rear light comprises an exit glass 15 (illustrated in Figures 3 and 4). In a non-limiting embodiment, the exit glass 15 comprises an anti-UV treatment to cut UV (between 300 and 400 nanometers) coming from sunlight.

[0035] The transmitter module 10 is described below.

[0036] The emission module 10 comprises a light module 100 configured to emit an initial light beam Fx partly in visible light (which comprises a blue, yellow, and red component). The initial light beam Fx makes it possible to perform a photometric function called function f. In a non-limiting embodiment, the photometric function is a lighting and / or signaling or daytime running light function.

[0037] In order to emit the initial light beam Fx, the light module 100 comprises at least one light source 100.1 configured to emit light rays to form said initial light beam Fx. The light rays are blue and yellow light rays, the light thus formed being visible light which appears white to the human eye. The blue light rays can be converted into infrared light rays by means known to those skilled in the art.

[0038] Thus, the initial light beam Fx emitted by the light source 100.1 thus presents an electromagnetic spectrum of which at least a portion is located in the visible spectrum, the rest being in the infrared. The electromagnetic spectrum presents an intensity peak B1 in the blue (illustrated on the). It presents other less significant intensity peaks in the visible and infrared.

[0039] In a non-limiting embodiment, the light source 100.1 is a semiconductor light source. In a non-limiting embodiment, said semiconductor light source is part of a light-emitting diode. By light-emitting diode, we mean any type of light-emitting diode, whether in non-limiting examples LEDs (Light Emitting Diodes), OLEDs (Organic LEDs), AMOLEDs (Active-Matrix-Organic LEDs), or FOLEDs (Flexible OLEDs). In other non-limiting embodiments, said light source 100.1 is a laser-type source such as a VCSEL laser diode (Vertical Cavity Surface Emitting Laser) or a SLED (Superluminescent Diode).

[0040] In a non-limiting embodiment, the transmission module 10 further comprises a modulation unit 102 configured to generate a modulated signal 6 to control the emission of said initial light beam Fx. In a non-limiting embodiment, the modulated signal 6 is a pulse width modulated signal of the PMW (“Pulse Width Modulation” in English) type known to those skilled in the art. Of course, other types of modulated signal 6 can be used such as a signal of the PCM (“Pulse Code Modulation” in English), PAM (“Pulse Amplitude Modulation” in English), or PPM (“Pulse Position Modulation” in English) type.

[0041] In the context of the detection of a target object 3, when the initial light beam Fx is emitted, if there are one or more target objects 3 in the field of vision of the initial light beam Fx, the initial light beam Fx is reflected on the target object(s) 3 and generates a light beam Fx'. The latter is received by the reception module 11 of the system 1.

[0042] In the context of the data transmission between the motor vehicle 2 and another vehicle or a road infrastructure, the initial light beam Fx is directly transmitted to the receiving module 11. Thus, in this case, the light beam Fx' received by the receiving module 11 is the initial light beam Fx. The initial light beam Fx in this case carries a data sequence D (illustrated in the) which will be used for communication between the motor vehicle 2 and another vehicle 4 or a road infrastructure. It thus makes it possible to carry out its photometric function f, but also to carry out the transport of the data sequence.

[0043] The receiving module 11 is thus configured to:- receive the light beam Fx' from the initial light beam Fx.

[0044] For this purpose, as illustrated in Figures 1 and 2, the reception module 11 comprises: - at least two optical elements 110, and - at least one photodetector 111.

[0045] The two optical elements 110 are placed in front of said at least one photodetector 111.

[0046] The two optical elements 110 are configured to receive the light beam Fx' and to filter the light beam Fx' over a wavelength range LP of 435 and 455 nanometers so as to obtain a light beam Fx' centered on the blue light. They are thus configured to transmit to the photodetector 111 the light beam Fx' over this wavelength range LP. This makes it possible to focus around the blue light of the light beam Fx' coming from the initial light beam Fx, where the intensity is the strongest compared to the other components of the white light and the infrared light.

[0047] Due to sunlight or surrounding light, both of which are otherwise called stray light, the receiving module 11 also receives this sunlight or surrounding light, otherwise called ambient light. The surrounding light is, in non-limiting examples, coming from a front headlight of another vehicle or a train. There will thus be a superposition of the light beam Fx' and the sunlight or surrounding light. The illustration shows the irradiance spectrum of the sun Fxs superimposed on the intensity spectrum of the light beam Fx' which comes from the initial light beam Fx. It will be noted that the wavelengths are on the abscissa and that the relative intensity is on the ordinate.

[0048] Filtering the light beam Fx' over the wavelength range of 435 and 455 nanometers makes it possible to filter all the sunlight that does not overlap with the blue light that has an intensity peak B1 (illustrated in the). This reduces the sunlight or surrounding light that will subsequently be received by the photodetector(s) 111 described later. This reduces a significant portion of the noise related to this sunlight or surrounding light. Only the noise that overlaps with the blue light will remain.

[0049] In a first non-limiting embodiment of the reception module 11 illustrated in: - one of the two optical elements 110 comprises a first lens 110.1 and an associated low-pass filter 110.2, - the other of the two optical elements 110 comprises a second lens 110.3 and an associated high-pass filter 110.4.

[0050] The low-pass filter 110.2 is configured to cut the light beam Fx' over a first wavelength range L. In a non-limiting embodiment, the first wavelength range L is between 455 nanometers and 650 nanometers. Thus, the low-pass filter 110.2 cuts the high wavelengths in the light beam Fx'.

[0051] The high-pass filter 110.4 is configured to cut the light beam Fx' over a second wavelength range L'. In a non-limiting embodiment, the second wavelength range L' is between 380 nanometers and 435 nanometers. Thus, the high-pass filter 110.3 cuts the low wavelengths in the light beam Fx'.

[0052] Note that the first wavelength range L and the second wavelength range L' do not overlap. This is much simpler to achieve and optimize than if the two wavelength ranges overlapped. The fact that the wavelength ranges are not too wide makes the construction of the filters less complex, unlike a "wider" filter.

[0053] In a non-limiting embodiment, the low-pass filter 110.2 and the high-pass filter 110.4 are conventional filters of the parallel-faced blade type. As illustrated in the non-limiting example of the, the first lens 110.1 and the associated low-pass filter 110.2 are arranged closer to the exit glass 15 and the second lens 110.3 and the associated high-pass filter 110.4 are arranged further away, the two low-pass filters 110.2 and high-pass filters 110.4 being arranged between the two lenses 110.1 and 110.4. It will be noted that the opposite could be the case, namely the second lens 110.3 and the associated high-pass filter 110.4 arranged closer to the exit glass 15 and the first lens 110.1 and the associated low-pass filter 110.2 arranged further away. In a non-limiting embodiment, the first lens 101.1 and the second lens 101.3 are convex-convex lenses. It will be noted that plano-convex lenses also work.

[0054] In a second non-limiting embodiment of the reception module 11 illustrated in: - one of the optical elements 110 is a first lens 110.5 with high-pass spectral absorption property, - the other of the optical elements 110 is a second lens 110.6 with low-pass spectral absorption property.

[0055] The first lens 110.5 is configured to cut the light beam Fx' over the first wavelength range L. In a non-limiting embodiment, the first wavelength range L is between 455 nanometers and 650 nanometers. Thus, the first lens 110 cuts the high wavelengths in the light beam Fx'.

[0056] The second lens 110.6 is configured to cut the light beam Fx' over the second wavelength range L'. In a non-limiting embodiment, the second wavelength range L' is between 380 nanometers and 435 nanometers. Thus, the second lens 110 cuts the low wavelengths in the light beam Fx'.

[0057] In a non-limiting embodiment, the first lens 110 and the second lens 110 are lenses injected into absorbent glass in the mass.

[0058] In a non-limiting embodiment, the absorbent material of the first lens 110.5 is a tinted glass which has been selected so that it has a transmission coefficient of at least 80% in the first wavelength range L, and a transmission coefficient of less than 80% outside this first range. It will be noted that outside this first range, the goal is to get closer to 0%.

[0059] In a non-limiting embodiment, the absorbent material of the second lens 110.6 is a tinted glass which has been selected so that it has a transmission coefficient of at least 80% in the second wavelength range L' and a transmission coefficient of less than 80% outside this second range. It will be noted that outside this second range, the aim is to get close to 0%.

[0060] As illustrated in the non-limiting example of the, the first lens 110.5 is arranged closer to the exit window 15, while the second lens 110.6 is arranged further away. It will be noted that the opposite could be the case.

[0061] Thus, ultimately, by cutting the high wavelengths and the low wavelengths, the set of two optical elements 110 according to the first non-limiting embodiment, or according to the second non-limiting embodiment, makes it possible to filter the light beam Fx' over the wavelength range of blue light between 435 and 455 nanometers so as to obtain a light beam Fx' centered on the blue light, otherwise called a centered light beam Fx'. It will be noted that obtaining filtering between 435 and 455 nanometers according to these two non-limiting embodiments is less expensive than obtaining filtering between 435 and 1000 nanometers which would in this case integrate the infrared.

[0062] The centered light beam Fx' is transmitted to the photodetector(s) 111.

[0063] The photodetector 111 is thus configured to receive from the two optical elements 110 the light beam Fx' centered on the blue light.

[0064] In a non-limiting embodiment, the receiving module 11 comprises a plurality of photodetectors 111. In a non-limiting embodiment, each photodetector is an avalanche photodiode also known as SPAD (Single Photon Avalanche Diode). The set of avalanche photodiodes can thus form a silicon photomultiplier or SiPM (Silicon PhotoMultiplier). This non-limiting embodiment of the photodiode is taken as a non-limiting example in the remainder of the description.

[0065] The photodiode 111 is a matrix of pixels. In the context of the detection of a target object 3, from the received centered light beam Fx', the photodiode 111 will image the target object 3 in its image focal plane. In a non-limiting embodiment, the photodiode 111 is arranged at the image focal plane of the reception module 11. This makes it possible to precisely detect the target object(s) 3 located in the field of vision of the initial light beam Fx.

[0066] When the sunlight conditions or the surrounding light in the vicinity of the motor vehicle 2 are particularly high, as seen previously, the sunlight or the surrounding light which is received by the photodiode 111 is that which is added to the light beam Fx' received by the reception module 11, around the blue light.

[0067] Consequently, if the photodiode 111 of the receiving module 11 receives other lights than the blue light coming from the filtering by the two optical modules 110, it risks being saturated by these other lights, in particular if the latter have a very high intensity. It is recalled that sunlight also includes near infrared, infrared and UV. It is recalled that the wavelengths of infrared are between 655 and 1000 nm. In order to eliminate the noise which remains due to the stray light around the centered light beam Fx', the photodiode 111 is made insensitive to infrared as described below. It will be noted that the UV are themselves filtered by the output glass 15 which comprises an anti-UV treatment in a non-limiting embodiment.

[0068] It is recalled that a photodiode classically comprises a PN junction (illustrated on the) and the epitaxial growth of the PN junctions is based on a silicon Si substrate (illustrated on the). The silicon substrate is classically transparent for infrared but opaque for visible light and blue light, namely it absorbs in particular blue photons and does not allow blue light to pass through.

[0069] To increase the sensitivity of the photodiode 111 to blue light and therefore make it insensitive to infrared, in a first non-limiting embodiment, the PN junction is placed close to the silicon Si substrate, which amounts to thinning the silicon Si substrate to allow blue photons to pass through to the PN junction. Thus, the spectral sensitivity of the photodiode 111 is adjusted according to the position of the PN junction relative to the silicon Si substrate. The closer the PN junction is to the silicon Si substrate, the less the blue light photons will be filtered by the silicon Si substrate. As the silicon Si substrate is thinned, it becomes more transparent to blue light and therefore more opaque to infrared light. Thus, the photodiode 111 has maximum sensitivity in the blue wavelengths.

[0070] It will be noted that a PN junction far from the silicon Si substrate will be more sensitive in the infrared. In a non-limiting embodiment, the photodiode 111 comprises a PN junction with a band gap of between 3 electron volts and 2.5 electron volts. In a non-limiting alternative embodiment, it is approximately 2.6 electron volts. This makes it possible to have a PN junction close to the surface of the silicon Si substrate. In a non-limiting embodiment, to obtain such a band gap of approximately 2.6 electron volts, the photodiode is composed of aluminum arsenide or gallium-indium nitride. It will be noted that to have spectral sensitivity in the infrared, there would be a band gap of approximately 1.8 electron volts, which corresponds to the infrareds which start from 655 nanometers.

[0071] Therefore, thanks to this PN junction close to the silicon substrate Si, this allows the photodiode 111 to be very sensitive to blue light and insensitive to infrared light, and thus to capture well the centered light beam Fx' transmitted by the optical reception module 11 and to capture very little sunlight or surrounding light including infrared. Thus, neither the visible light coming from the sun or surrounding light, nor the infrared coming from the sun or surrounding light can saturate the photodiode 111. It remains insensitive to the wavelengths corresponding to stray light. The signal-to-noise ratio is not reduced, but is on the contrary maximized. Thus, stray light will not interfere with the acquisition of the centered light beam Fx' by the photodiode 111.

[0072] In a second non-limiting embodiment, the silicon substrate Si is removed. It is removed by a laser etching process or a grinding process known to those skilled in the art. This makes it possible to obtain the same result as for the first non-limiting embodiment, namely a maximization of the sensitivity of the photodiode 111 to blue light and a minimization of its sensitivity to other lights such as infrared light.

[0073] The photodetector 111 is configured to convert the centered light beam Fx' that it has received into a corresponding electrical signal 7. The electrical signal 7 is analog or digital.

[0074] The reception module 11 further comprises a demodulation unit 112 configured to demodulate the electrical signal 7.

[0075] In the context of a detection of a target object 3, the reception module 11 transmits the demodulated electrical signal 7' to a calculation unit 12 of the system 1 as illustrated in the. The calculation unit 12 analyzes it and performs a correlation with the modulated signal 6 seen previously. The correlation allows the calculation unit 12 to determine a time of flight separating the emission of the initial light beam Fx and the reception of the light beam Fx' and thus to deduce the presence or absence of a target object 3 in the field of vision of the initial light beam Fx.

[0076] In a non-limiting embodiment, the calculation unit 12 is an electronic control unit 12, otherwise called ECU from the English “Electronic Control Unit”. It will be noted that the electronic control unit 12 comprises one or more processors.

[0077] In non-limiting embodiments, said correlation is based on:- an accumulation method m based on a histogram of photon distribution in the demodulated electronic signal 7', or- a detection coincidence method m' based on a detection of a number of photons in said demodulated electronic signal 7' over a duration of one bit. The accumulation method and the coincidence method being known to those skilled in the art, they are not described here.

[0078] In the context of communication with another vehicle 4 or a road infrastructure, during the demodulation of the electrical signal 7, the reception module 11 extracts the data sequence D and transmits it to a computer 13 of the motor vehicle 2 as illustrated in the for it to be interpreted, decoded and / or transmitted to equipment or to a user interface of the motor vehicle 2.

[0079] Of course, the description of the invention is not limited to the embodiments described above and to the field described above.

[0080] Thus, the invention described has the following advantages in particular: - it replaces ultrasonic detection systems, - it makes it possible to make the transmission of an electrical signal by a photodetector 111 of the receiving module 11 reliable, even in the presence of sunlight, or ambient light, - it is a solution which can be used for near-field detection of the ADAS (“Advanced Driver-Assistance System” in English) type for assistance with parking or for assistance during traffic jams in non-limiting examples, - it makes it possible to have a level 3 of autonomy for vehicles, a level which requires having three sensors of different types for safety.It thus provides an additional detection sensor in addition to conventional lidars and conventional radars, - it is a simpler and less expensive solution than interference systems which use a stack of more than 100 layers of different materials with different refractive indices, - the two optical modules 111 of the receiving module 11 make it possible to obtain effective filtering of blue light in a simple and inexpensive way, - it makes it possible to make the photodetector(s) 110 insensitive to infrared in a simple way.

Claims

System (1) for vehicle (2) comprising:- a module (11) for receiving a light beam (Fx'), said receiving module (11) comprising at least one photodetector (111),Characterized in that:- (a) said receiving module (11) further comprises at least two optical elements (110) configured to:- receive said light beam (Fx') from an initial light beam (Fx) generated by an emission module (10),- cut said light beam (Fx') on a first wavelength range (L) and on a second wavelength range (L'), and- transmit to said at least one photodetector (111) said light beam (Fx') on a wavelength range (LP) between 435 and 455 nanometers,and in that:- (b) said at least one photodetector (111) is arranged to have maximum sensitivity in the blue wavelengths and is configured to receive said light beam (Fx') over said wavelength range (LP) and to convert it into a corresponding electrical signal (7)., System (1) according to claim 1, wherein said at least one detector (111) comprises a PN junction with a band gap (G) between 3 electronvolts and 2.5 electronvolts. System (1) according to claim 1 or claim 2, according to which:- one of the optical elements (110) comprises a first lens (110.1) and an associated low-pass filter (110.2) configured to cut the light beam (Fx') over the first wavelength range (L), and- the other of the optical elements (110) comprises a second lens (110.3) and an associated high-pass filter (110.4) configured to cut the light beam (Fx') over the second wavelength range (L'). System (1) according to claim 1 or claim 2, according to which:- one of the optical elements (110) is a first lens with high-pass spectral absorption property configured to cut the light beam (Fx') over the first wavelength range (L), and- the other of the optical elements (110) is a second lens with low-pass spectral absorption property configured to filter the light beam (Fx') over the second wavelength range (L'). System (1) according to any one of the preceding claims, wherein the first wavelength range (L) is between 455 nanometers and 650 nanometers. System (1) according to any one of the preceding claims, wherein the second wavelength range (L') is between 380 nanometers and 435 nanometers. System (1) according to any one of the preceding claims, wherein said system (1) further comprises an emission module (10) comprising a light module (100) configured to emit said initial light beam (Fx) partly in visible light. System (1) according to the preceding claim, according to which said emission module (10) further comprises a modulation unit (102) configured to generate a modulated signal (6) to control the emission of said initial light beam (Fx). System (1) according to claim 7 or claim 8, wherein said light module (100) comprises at least one light source (100.1) configured to emit said initial light beam (Fx) to perform a photometric lighting and / or signaling or daytime running light function. System (1) according to any one of the preceding claims 7 to 9, wherein said emission module (10) is part of a headlight or a rear light of said vehicle (2). System (1) according to any one of the preceding claims, wherein said light beam (Fx') is a light beam reflected on at least one target object (3) located in a field of vision of said initial light beam (Fx). System (1) according to the preceding claim, according to which said reception module (11) further comprises a demodulation unit (112) configured to demodulate the electrical signal (7) and transmit said demodulated electrical signal (7') to a calculation unit (12), and according to which said calculation unit (12) is configured to, from said demodulated electrical signal (7'), carry out a correlation between said demodulated electrical signal (7') and said modulated signal (6) to deduce therefrom the presence of said at least one target object (3). System (1) according to any one of the preceding claims 7 to 9, wherein said emission module (10) is part of another vehicle (4) or road infrastructure. System (1) according to the preceding claim, according to which said light beam (Fx') carries a data sequence (D). System (1) according to the preceding claim, wherein said receiving module (11) further comprises a demodulation unit (112) configured to demodulate the electrical signal (7) and extract said data sequence (D) therefrom to use it for communication with said other vehicle (4) or said road infrastructure.

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