Vehicle system comprising module for receiving light beam

Abstract

The invention relates to a system (1) for a vehicle (2). The 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'), said light beam source being free from an initial light beam (Fx) generated by a transmitting module (10), said receiving module (11) comprising a photodetector (111); -splitting the light beam (Fx ') in a first wavelength range and a second wavelength range, and-transmitting the light beam (Fx') having a wavelength range (LP) between 435 and 455 nanometers to the photodetector (111), and is characterized in that: (b) the photodetector (111) is arranged to have a maximum sensitivity in the blue wavelength, and is configured to convert the received light beam (Fx ') into an electrical signal (7).

Description

Technical Field

[0001] The present invention relates to a vehicle system including a module for receiving a light beam. The vehicle system is particularly suitable for (but not limited to) detecting a target object located in front of a motor vehicle, and is even suitable for transmitting data from one motor vehicle to another motor vehicle, or from a motor vehicle to road infrastructure. Background Art

[0002] In the field of motor vehicles, a vehicle system known to those skilled in the art includes a module for receiving a light beam, the module including at least one photodetector configured to convert the light beam into a corresponding electrical signal. In the case of detecting a target object, a computing unit is configured to detect the presence or absence of the target object based on the electrical signal transmitted by the at least one photodetector. In the case of data transmission, the computing unit is configured to detect the transmitted data based on the electrical signal transmitted by the at least one photodetector.

[0003] One drawback of the prior art is that in some cases, the signal-to-noise ratio of the photodetector may drop significantly. This is especially true under bright sunlight or bright ambient light. Specifically, under these conditions, sunlight or ambient light may cause the photodetector to saturate. The electrical signal transmitted by the photodetector (which contains information required for detecting a target object or communicating with other vehicles or road infrastructure) will be drowned in the noise generated by sunlight or ambient light. Summary of the Invention

[0004] In this context, the present invention aims to provide a vehicle system configured to overcome the above-mentioned drawbacks.

[0005] To this end, the present invention provides a vehicle system, comprising:

[0006] - a receiving module for receiving a light beam, the receiving module including at least one photodetector,

[0007] characterized in that:

[0008] - (a) the receiving module further includes at least two optical elements configured to:

[0009] - receive the light beam, the light beam being generated from an initial light beam generated by a transmitting module;

[0010] - block the light beam in a first wavelength range and a second wavelength range; and

[0011] - transmit the light beam having a wavelength range between 435 and 455 nanometers to the at least one photodetector,

[0012] and characterized in that:

[0013] -(b) The at least one photodetector is arranged to have maximum sensitivity at blue wavelengths and is configured to receive the light beam within the wavelength range (LP) and convert it into a corresponding electrical signal.

[0014] Thus, as will be elaborated in detail below, combining the filtering of the two optical elements with the use of a photodetector insensitive to infrared light can improve the signal-to-noise ratio of the light beam (noise being sunlight).

[0015] According to a non-limiting embodiment, the vehicle system may further include, individually or in any technically feasible combination, one or more additional features selected from the following options.

[0016] According to a non-limiting embodiment, the at least one detector includes a PN junction with a bandgap between 3 electron volts and 2.5 electron volts.

[0017] According to a non-limiting embodiment,

[0018] - One of the optical elements includes a first lens and an associated low-pass filter configured to block light beams within a first wavelength range; and

[0019] - The other optical element includes a second lens and an associated high-pass filter configured to block light beams within a second wavelength range.

[0020] According to a non-limiting embodiment,

[0021] - One of the optical elements is a first lens having high-pass spectral absorption characteristics configured to block light beams within a first wavelength range; and

[0022] - The other optical element is a second lens having low-pass spectral absorption characteristics configured to filter light beams within a second wavelength range.

[0023] According to a non-limiting embodiment, the first wavelength range is between 455 nanometers and 650 nanometers.

[0024] According to a non-limiting embodiment, the second wavelength range is between 380 nanometers and 435 nanometers.

[0025] According to a non-limiting embodiment, the system further includes a transmitting module (10), which includes a light-emitting module configured to emit the initial light beam that is partially within the visible light range.

[0026] According to a non-limiting embodiment, the transmitting module further includes a modulation unit configured to generate a modulation signal for controlling the emission of the initial light beam.

[0027] According to a non - limiting embodiment, the lighting module includes at least one light source configured to emit the initial light beam for performing photometric lighting and / or signal indication or daytime running light function.

[0028] According to a non - limiting embodiment, the emission module forms part of the vehicle's headlight or taillight.

[0029] According to a non - limiting embodiment, the light beam is a beam reflected from at least one target object located within the field of view of the initial light beam.

[0030] According to a non - limiting embodiment, the receiving module further includes a demodulation unit configured to demodulate the electrical signal and transmit the demodulated electrical signal to a calculation unit, and the calculation unit is configured to correlate the demodulated electrical signal with the modulation signal based on the demodulated electrical signal to thereby deduce the presence of the at least one target object.

[0031] According to a non - limiting embodiment, the emission module forms part of another vehicle or road infrastructure.

[0032] According to a non - limiting embodiment, the light beam transmits a data sequence.

[0033] According to a non - limiting embodiment, the receiving module further includes a demodulation unit configured to demodulate the electrical signal and extract the data sequence therefrom for use in communicating with the other vehicle or the road infrastructure. Description of the Drawings

[0034] The present invention and its various applications can be better understood by reading the following description and referring to the drawings:

[0035] Figure 1 Shows a schematic structure of a vehicle system according to a first non - limiting embodiment of the present invention, the system including a receiving module having at least two optical elements and at least one photodetector, the receiving module being configured to receive a light beam generated by an initial light beam of an emission module, the emission module forming part of the system;

[0036] Figure 2 Shows a schematic structure of a vehicle system according to a second non - limiting embodiment of the present invention, the system including a receiving module having at least two optical elements and at least one photodetector, the receiving module being configured to receive a light beam generated by an initial light beam of an emission module, the emission module being located outside the system;

[0037] Figure 3Showing the Figure 1 or Figure 2 schematic structure of at least two optical elements of the receiving module;

[0038] Figure 4 Showing the Figure 1 or Figure 2 schematic structure of at least two optical elements of the receiving module;

[0039] Figure 5 Schematically showing, according to a non - restrictive embodiment, Figure 3 or Figure 4 the PN - junction of at least one photodetector in

[0040] Figure 6 Schematically and partially showing the optical intensity spectrum of the light beam generated by the receiving module in Figure 1 or Figure 2 , the intensity spectrum being superimposed on the solar irradiance spectrum.

[0041] Unless otherwise specified, elements having the same structure or function appearing in the respective figures are denoted by the same reference numerals. Detailed Description

[0042] Now, the vehicle detection system 1 according to the present invention will be described with reference to Figures 1 to 6 In a non - restrictive embodiment, the vehicle 2 is a motor vehicle. A motor vehicle refers to any type of internal combustion engine or electric vehicle. In the remainder of this specification, this embodiment will be considered by way of non - restrictive examples. Therefore, hereinafter, the vehicle 2 is also referred to as the motor vehicle 2.

[0043] As shown in Figure 1 and Figure 2 , the system 1 includes a receiving module 11.

[0044] In the first non - restrictive embodiment shown in Figure 1 , the system 1 further includes a transmitting module 10. In this case, the receiving module 11 and the transmitting module 10 form part of the headlight or taillight of the motor vehicle 2. In this case, in a non - restrictive example, the system 1 is used to detect a target object 3.

[0045] In the second non - restrictive embodiment shown in Figure 2 , the system 1 does not include the transmitting module 10. In this case, the transmitting module 10 forms part of another vehicle 4 or road infrastructure (not shown). In this case, in a non - restrictive example, the system 1 is used to transmit data from the motor vehicle 2 to another vehicle 4 or road infrastructure. Figure 2Shows a non - limiting example of another vehicle 4. This vehicle can be replaced by road infrastructure.

[0046] In one non - limiting embodiment, the headlight or taillight includes an outer lens 15 (as Figure 3 and Figure 4 shown). In one non - limiting embodiment, the outer lens 15 is treated to be UV - resistant to block ultraviolet rays (wavelength 300 to 400 nanometers) in sunlight.

[0047] The emission module 10 will be described below.

[0048] The emission module 10 includes a light - emitting module 100, which is configured to emit an initial light beam Fx that is part of visible light (including blue, yellow, and red components). The initial light beam Fx can perform a photometric measurement function called function f. In one non - limiting embodiment, this photometric measurement function is an illumination and / or signal indication or daytime running light function.

[0049] To emit the initial light beam Fx, the light - emitting module 100 includes at least one light source 100.1, which is configured to emit light rays to form the initial light beam Fx. The light rays are blue light rays and yellow light rays, and the resulting light is visible light and appears white to the human eye. The blue light rays can be converted into infrared light rays by methods known to those skilled in the art.

[0050] Therefore, the initial light beam Fx emitted by the light source 100.1 has an electromagnetic spectrum, at least a part of which is located in the visible spectrum and the rest is located in the infrared spectrum. This electromagnetic spectrum has an intensity peak B1 in blue light (as Figure 6 shown). This electromagnetic spectrum has other smaller intensity peaks in visible light and infrared light.

[0051] In one non - limiting embodiment, the light source 100.1 is a semiconductor light source. In one non - limiting embodiment, the semiconductor light source forms part of a light - emitting diode. A light - emitting diode refers to any type of light - emitting diode, for example, as a non - limiting example, a traditional LED (light - emitting diode), an OLED (organic light - emitting diode), an AMOLED (active - matrix organic light - emitting diode), or even a FOLED (flexible OLED). In other non - limiting embodiments, the light source 100.1 is a laser source, such as a VCSEL (vertical - cavity surface - emitting laser) or an SLED (super - luminescent light - emitting diode).

[0052] In a non - limiting embodiment, the transmitting module 10 further includes a modulation unit 102, which is configured to generate a modulation signal 6 for controlling the emission of the initial light beam Fx. In a non - limiting embodiment, the modulation signal 6 is a PWM (Pulse - Width Modulation) signal known to those skilled in the art. Of course, other types of modulation signals 6 can also be used, such as PCM (Pulse - Code Modulation) signals, PAM (Pulse - Amplitude Modulation) signals, or PPM (Pulse - Position Modulation) signals.

[0053] In the case of detecting a target object 3, when the initial light beam Fx is emitted, if there is one or more target objects 3 within the field of view of the initial light beam Fx, the initial light beam Fx will be reflected from the one or more target objects 3 and generate a light beam Fx'. The light beam Fx' is received by the receiving module 11 of the system 1.

[0054] In the case of transmitting data between the motor vehicle 2 and another vehicle or road infrastructure, the initial light beam Fx is directly transmitted to the receiving module 11. Therefore, in this case, the light beam Fx' received by the receiving module 11 is the initial light beam Fx. In this case, the initial light beam Fx transmits a data sequence D (as Figure 2 shown), and this data sequence will be used for communication between the motor vehicle 2 and another vehicle 4 or road infrastructure. Therefore, the initial light beam Fx can not only perform its photometric measurement function f, but also transmit a data sequence.

[0055] The receiving module 11 is configured to:

[0056] - Receive the light beam Fx' generated by the initial light beam Fx.

[0057] For this purpose, as Figure 1 and Figure 2 shown, the receiving module 11 includes:

[0058] - At least two optical elements 110, and

[0059] - At least one photodetector 111.

[0060] These two optical elements 110 are located in front of the at least one photodetector 111.

[0061] These two optical elements 110 are configured to receive the light beam Fx' and filter the light beam Fx' within a wavelength range LP of 435 to 455 nanometers, so as to obtain a light beam Fx' centered on blue light. Therefore, these two optical elements are configured to transmit the light beam Fx' within the wavelength range LP to the photodetector 111. This enables focusing on the blue light in the light beam Fx' generated by the initial light beam Fx, and the intensity of this blue light is the largest relative to other components of white light and infrared light.

[0062] If there is sunlight or ambient light (collectively referred to as parasitic light), the receiving module 11 will receive such sunlight or ambient light, which is also referred to as environment-related light. In a non-limiting example, the ambient light is generated by the headlight of another vehicle or train. Accordingly, the light beam Fx' and the sunlight or ambient light will be superimposed. Figure 6 The irradiance spectrum of the sunlight Fxs superimposed on the intensity spectrum of the light beam Fx' generated by the initial light beam Fx is shown. It should be noted that the x-axis represents the wavelength and the y-axis represents the relative intensity.

[0063] Filtering the light beam Fx' in the wavelength range of 435 to 455 nanometers can filter out any sunlight that is not superimposed on the blue light with the intensity peak B1 (as Figure 6 shown). In this way, the sunlight or ambient light that will subsequently be received by the (one or more) photodetectors 111 described below will be reduced. The noise associated with such sunlight or ambient light will also be significantly reduced. Only the noise superimposed on the blue light will remain.

[0064] In Figure 3 the first non-limiting embodiment of the receiving module 11 shown:

[0065] - One of the two optical elements 110 includes a first lens 110.1 and an associated low-pass filter 110.2;

[0066] - The other of the two optical elements 110 includes a second lens 110.3 and an associated high-pass filter 110.4.

[0067] The low-pass filter 110.2 is configured to block the light beam Fx' within a first wavelength range L. In a non-limiting embodiment, the first wavelength range L is between 455 nanometers and 650 nanometers. Accordingly, the low-pass filter 110.2 blocks the long wavelengths in the light beam Fx'.

[0068] The high-pass filter 110.4 is configured to block the light beam Fx' within a second wavelength range L'. In a non-limiting embodiment, the second wavelength range L' is between 380 nanometers and 435 nanometers. Accordingly, the high-pass filter 110.3 blocks the short wavelengths in the light beam Fx'.

[0069] It should be noted that the first wavelength range L and the second wavelength range L' do not overlap. This is easier to implement and optimize than when the two wavelength ranges overlap. The fact that the wavelength ranges are not too wide makes the production of the filters simpler compared to "wider" filters.

[0070] In a non-limiting embodiment, both the low-pass filter 110.2 and the high-pass filter 110.4 are conventional optical flats having two parallel faces. As Figure 3As shown in the non - limiting example, the first lens 110.1 and its associated low - pass filter 110.2 are placed close to the outer lens 15, while the second lens 110.3 and its associated high - pass filter 110.4 are placed at a farther position, and the two low - pass filters 110.2 and high - pass filters 110.4 are placed between the two lenses 110.1 and 110.4. It should be noted that this arrangement can be reversed, that is, the second lens 110.3 and its associated high - pass filter 110.4 are placed close to the outer lens 15, while the first lens 110.1 and its associated low - pass filter 110.2 are placed at a farther position. In a non - limiting embodiment, both the first lens 101.1 and the second lens 101.3 are biconvex lenses. It should be noted that plano - convex lenses can also be used.

[0071] In Figure 4 the second non - limiting embodiment of the receiving module 11 shown:

[0072] - One of the optical elements 110 is a first lens 110.5 having a high - pass spectral absorption characteristic;

[0073] - The other of the optical elements 110 is a second lens 110.6 having a low - pass spectral absorption characteristic.

[0074] The first lens 110.5 is configured to block the light beam Fx' within 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 blocks the long wavelengths in the light beam Fx'.

[0075] The second lens 110.6 is configured to block the light beam Fx' within 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 blocks the short wavelengths in the light beam Fx'.

[0076] In a non - limiting embodiment, both the first lens 110 and the second lens 110 are injection - molded lenses made of absorption glass with an absorbent body.

[0077] In a non - limiting embodiment, the absorbing material of the first lens 110.5 is colored glass, which is selected such that its transmission coefficient within the first wavelength range L is at least 80%, while its transmission coefficient outside the first wavelength range is less than 80%. It should be noted that outside the first wavelength range, the goal is to be as close to 0% as possible.

[0078] In a non - limiting embodiment, the absorbing material of the second lens 110.6 is colored glass, which is selected such that its transmission coefficient within the second wavelength range L’ is at least 80%, while the transmission coefficient outside this second wavelength range is less than 80%. It should be noted that outside the second wavelength range, the goal is to be as close as possible to 0%.

[0079] As Figure 4 shown in the non - limiting example of, the first lens 110.5 is placed close to the outer lens 15, while the second lens 110.6 is placed at a farther position. It should be noted that this arrangement can be reversed.

[0080] Thus, ultimately, by blocking long and short wavelengths, according to the first non - limiting embodiment or according to the second non - limiting embodiment, the two optical elements 110 together allow filtering of the light beam Fx’ within the blue - light wavelength range between 435 and 455 nanometers, thereby obtaining a light beam Fx’ centered on blue light, or in other words, a centered light beam Fx’. It should be noted that according to these two non - limiting embodiments, filtering between 435 and 455 nanometers is less costly than filtering between 435 and 1000 nanometers (i.e., filtering into infrared light).

[0081] The centered light beam Fx’ is transmitted to the photodetector(s) 111.

[0082] In this way, the photodetector 111 is configured to receive the blue - light - centered light beam Fx’ from the two optical elements 110.

[0083] In a non - limiting embodiment, the receiving module 11 includes a plurality of photodetectors 111. In a non - limiting embodiment, each photodetector is an SPAD (single - photon avalanche diode). Thus, the avalanche photodiodes can together form a SiPM (silicon photomultiplier). In the remainder of the specification, this non - limiting embodiment of the photodiode will be used as a non - limiting example.

[0084] The photodiode 111 is a pixel matrix array. In the case of detecting the target object 3, based on the received centered light beam Fx’, the photodiode 111 will image the target object 3 on its image focal plane. In a non - limiting embodiment, the photodiode 111 is located within the image focal plane of the receiving module 11. This enables precise detection of one or more target objects 3 located within the field of view of the initial light beam Fx.

[0085] When the sunlight or ambient light near the motor vehicle 2 is particularly bright (as shown above), the sunlight or ambient light received by the photodiode 111 will be superimposed on the light beam Fx’ in the blue light received by the receiving module 11.

[0086] Therefore, if the photodiode 111 of the receiving module 11 receives light other than blue light (generated by filtering through the two optical modules 110), there is a risk of being saturated by this other light, especially when this other light is very bright. It should be noted that sunlight also contains near-infrared light, infrared light, and ultraviolet light. It should be noted that the infrared wavelength is between 655 and 1000 nm. In order to eliminate the residual noise caused by the parasitic light around the central beam Fx’, the photodiode 111 is designed to be insensitive to infrared light, as described below. It should be noted that the ultraviolet light is filtered by the outer lens 15, which, in a non-limiting embodiment, includes an anti-ultraviolet treatment.

[0087] It should be noted that a photodiode typically includes a PN junction (as Figure 5 shown), and this PN junction is epitaxially grown on a silicon substrate Si (as Figure 5 shown). The silicon substrate is typically transparent to infrared light but opaque to visible light and blue light, that is to say, the silicon substrate particularly absorbs blue photons and does not allow blue light to pass through.

[0088] In order to increase the sensitivity of the photodiode 111 to blue light and thus make it insensitive to infrared light, in a first non-limiting embodiment, the PN junction is placed close to the silicon substrate Si, which is equivalent to thinning the silicon substrate Si in order to allow blue photons to pass through the PN junction. Therefore, the spectral sensitivity of the photodiode 111 is adjusted according to the position of the PN junction relative to the silicon substrate Si. The closer the PN junction is to the silicon substrate Si, the fewer blue photons are filtered by the silicon substrate Si. As the silicon substrate Si becomes thinner, the photodiode becomes more transparent to blue light and thus more opaque to infrared light. Therefore, the photodiode 111 has the maximum sensitivity at the blue light wavelength.

[0089] It should be noted that a PN junction far from the silicon substrate Si has a higher sensitivity to infrared light. In a non-limiting embodiment, the photodiode 111 includes a PN junction with a bandgap between 3 electron volts and 2.5 electron volts. In a variant of the non-limiting embodiment, the bandgap is approximately 2.6 electron volts. This enables the PN junction to be obtained near the surface of the silicon substrate Si. In a non-limiting embodiment, in order to obtain a bandgap of approximately 2.6 electron volts, the photodiode is made of aluminum arsenide or indium gallium nitride. It should be noted that in order to obtain infrared spectral sensitivity, a bandgap of approximately 1.8 electron volts should be used, which corresponds to the infrared band extending from 655 nanometers.

[0090] Therefore, since the PN junction is close to the silicon substrate Si, the photodiode 111 can be very sensitive to blue light and insensitive to infrared light, thereby being able to satisfactorily capture the central beam Fx' emitted by the light receiving module 11 and hardly capturing sunlight or ambient light containing infrared light. Therefore, neither visible light from the sun nor infrared light or ambient light from the sun can saturate the photodiode 111. It remains insensitive to the wavelengths corresponding to parasitic light. The signal-to-noise ratio will not decrease but will be maximized. Therefore, parasitic light will not interfere with the acquisition of the central beam Fx' by the photodiode 111.

[0091] In the second non-limiting embodiment, the silicon substrate Si is omitted. It is removed using 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 in the first non-limiting embodiment, that is, to maximize the sensitivity of the photodiode 111 to blue light and minimize its sensitivity to other types of light (such as infrared light).

[0092] The photodetector 111 is configured to convert the received central beam Fx' into a corresponding electrical signal 7. The electrical signal 7 can be an analog signal or a digital signal.

[0093] The receiving module 11 further includes a demodulation unit 112 for demodulating the electrical signal 7.

[0094] In the case of detecting the target object 3, the receiving module 11 transmits the demodulated electrical signal 7' to the calculation unit 12 of the system 1, as Figure 1 shown. The calculation unit 12 analyzes it and correlates it with the previously seen modulation signal 6. This correlation allows the calculation unit 12 to determine the time of flight between the emission of the initial beam Fx and the reception of the beam Fx', thereby deriving whether the target object 3 exists within the field of view of the initial beam Fx.

[0095] In one non-limiting embodiment, the calculation unit 12 is an ECU (Electronic Control Unit). It should be noted that the electronic control unit 12 includes one or more processors.

[0096] In the non-limiting embodiment, the correlation is based on:

[0097] - A cumulative method m based on the histogram of photon distribution in the demodulated electronic signal 7'; or

[0098] - A coincidence detection method m' based on detecting the number of photons in the demodulated electronic signal 7' within a 1-bit duration. Since the cumulative method and the coincidence method are known to those skilled in the art, they will not be elaborated herein.

[0099] In the case of communication with another vehicle 4 or road infrastructure, during the demodulation of the electrical signal 7, the receiving module 11 extracts from it the data sequence D and transmits it to the computer 13 of the motor vehicle 2 (as Figure 2 shown) in order to interpret, decode it and / or transmit it to the equipment or user interface of the motor vehicle 2.

[0100] Of course, the description of the present invention is not limited to the above embodiments and fields.

[0101] Thus, the present invention particularly has the following advantages:

[0102] - Replaces the ultrasonic-based detection system;

[0103] - Enables the photodetector 111 of the receiving module 11 to reliably transmit the electrical signal even in the presence of sunlight or ambient light;

[0104] - This is a solution that can be used for near-field detection in ADAS (Advanced Driver Assistance Systems) to provide, for non-limiting examples, parking assistance or assistance during traffic congestion;

[0105] - Enables the implementation of level 3 vehicle autonomous driving, which, for safety reasons, requires the installation of three different types of sensors. Thus, in addition to traditional lidar and radar, it also allows for the installation of an additional sensor;

[0106] - Compared with the interference-based system, this is a simpler and more economical solution, because the interference system requires stacking more than 100 layers of materials with different refractive indices;

[0107] - The two optical modules 111 of the receiving module 11 can simply and economically achieve efficient blue light filtering;

[0108] - It is possible to simply make the (plural) photodetectors 110 insensitive to infrared light.

Claims

1. A system (1) for a vehicle (2), the system comprising: - A receiving module (11) for receiving a light beam (Fx’), the receiving module (11) including at least one photodetector (111), characterized in that: - (a) The receiving module (11) further includes at least two optical elements (110), the optical elements (110) being configured to: - Receive the light beam (Fx’), which is generated from an initial light beam (Fx) generated by a transmitting module (10); - Block the light beam (Fx’) within a first wavelength range (L) and a second wavelength range (L’); and - Transmit the light beam (Fx’) within a wavelength range (LP) between 435 and 455 nanometers to the at least one photodetector (111), and: - (b) The at least one photodetector (111) is arranged to have maximum sensitivity at a blue wavelength and is configured to receive the light beam (Fx’) within the wavelength range (LP) and convert it into a corresponding electrical signal (7).

2. The system (1) according to claim 1, wherein, The at least one detector (111) includes a PN junction having a bandgap (G) between 3 electron volts and 2.5 electron volts.

3. The system (1) according to claim 1 or claim 2, wherein: - One of the optical elements (110) includes a first lens (110.1) and an associated low-pass filter (110.2), the low-pass filter being configured to block the light beam (Fx’) within the first wavelength range (L’); and - The other of the optical elements (110) includes a second lens (110.3) and an associated high-pass filter (110.4), the high-pass filter being configured to block the light beam (Fx’) within the second wavelength range (L’).

4. The system (1) according to claim 1 or claim 2, wherein: - One of the optical elements (110) is a first lens having high-pass spectral absorption characteristics, which is configured to block the light beam (Fx’) within the first wavelength range (L); and - The other of the optical elements (110) is a second lens having low-pass spectral absorption characteristics, which is configured to filter out the light beam (Fx’) within the second wavelength range (L’).

5. The system (1) according to any one of the preceding claims, wherein, The first wavelength range (L) is between 455 nanometers and 650 nanometers.

6. The system (1) according to any one of the preceding claims, wherein, The second wavelength range (L’) is between 380 nanometers and 435 nanometers.

7. The system (1) according to any one of the preceding claims, wherein, The system (1) further includes a transmitting module (10), the transmitting module (10) including a light-emitting module (100), the light-emitting module being configured to emit the initial light beam (Fx) partially within the visible light range.

8. The system (1) according to the preceding claim, wherein, The transmitting module (10) further includes a modulation unit (102), the modulation unit (102) being configured to generate a modulation signal (6) for controlling the emission of the initial light beam (Fx).

9. The system (1) according to claim 7 or claim 8, wherein, The light emitting module (100) includes at least one light source (100.1) configured to emit the initial light beam (Fx) for the purpose of performing photometric lighting and / or signal indication or daytime running light function.

10. The system (1) according to any one of the preceding claims 7 to 9, wherein, The emitting module (10) forms part of the headlight or taillight of the vehicle (2).

11. The system (1) according to any one of the preceding claims, wherein, The light beam (Fx') is a light beam reflected from at least one target object (3) located within the field of view of the initial light beam (Fx).

12. The system (1) according to the previous claim, wherein, The receiving module (11) further includes a demodulation unit (112) configured to demodulate the electrical signal (7) and transmit the demodulated electrical signal (7') to the calculation unit (12), and wherein the calculation unit (12) is configured to correlate the demodulated electrical signal (7') with the modulation signal (6) based on the demodulated electrical signal (7') so as to deduce the presence of the at least one target object (3) therefrom.

13. The system (1) according to any one of the preceding claims 7 to 9, wherein, The emitting module (10) forms part of another vehicle (4) or road infrastructure.

14. The system (1) according to the previous claim, wherein, The light beam (Fx') transmits a data sequence (D).

15. The system (1) according to the previous claim, wherein, The receiving module (11) further includes a demodulation unit (112) configured to demodulate the electrical signal (7) and extract the data sequence (D) therefrom for the purpose of using it for communication with the other vehicle (4) or the road infrastructure.

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