KR102623125B1 - Road condition detection method and apparatus - Google Patents

Abstract

A road condition detection method and device are disclosed. A road condition detection method includes the steps of (a) radiating a plurality of first laser beams of different wavelengths onto a target road and receiving the reflected first laser beams; (b) transmitting microwave light to vibrate water molecules present on the target road to the target road; (c) radiating a plurality of second laser beams of different wavelengths onto the target road and receiving a reflected second laser beam; and (d) detecting the target road surface condition by analyzing the reflected first laser beam and the reflected second laser beam.

Description

Road condition detection method and apparatus {Road condition detection method and apparatus}

The present invention relates to a road condition detection method and device.

A representative conventional technology for detecting black ice is a method using the NIR spectrum. The NIR spectrum-based black ice detection method uses NIR (Near Infrared) wavelengths (0.6μm, 1.6μm, 2.15μm) that show differences in absorption when water, ice, and snow are the medium.

This is a detection method that utilizes the fact that water and ice show different reflection spectra in the near-infrared and mid-infrared, or by measuring the decrease of 1.5μm and 1.9μm, which shows water-sensitive absorption.

However, the conventional NIR spectrum-based black ice detection method has the problem of poor performance at night or in low lighting. Halogen is used to overcome this, but there is a problem in that it is difficult to apply in practice due to distance restrictions.

The present invention is to provide a road condition detection method and device.

In addition, the present invention is to provide a road condition detection method and device that can accurately detect the road surface condition using laser backscattering generated by water molecule vibration on the road.

According to one aspect of the present invention, a road condition detection method is provided that can accurately detect the road surface condition using laser backscattering generated by water molecule vibration on the road.

According to one embodiment of the present invention, (a) radiating a plurality of first laser beams of different wavelengths onto a target road and receiving the reflected first laser beams; (b) transmitting microwave light to vibrate water molecules present on the target road to the target road; (c) radiating a plurality of second laser beams of different wavelengths onto the target road and receiving a reflected second laser beam; and (d) detecting the target road surface condition by analyzing the reflected first laser beam and the reflected second laser beam.

The target road surface conditions are dry road, wet road, snow-covered road, and presence of black ice.

In steps (a) and (c), the reflected first laser beam and the reflected second laser beam may be horizontally polarized and vertically polarized for reception.

The target road surface condition may be detected using spectral characteristics of the reflected first laser beam and the reflected second laser beam received after passing through the vertical polarizer and the horizontal polarizer.

The plurality of laser beams of different wavelengths and the plurality of second laser beams of different wavelengths are laser beams of 0.6 μm, 1.6 μm, 2.15 μm, or 980 nm, 1310 nm, and 1550 nm with high water molecule absorption, and the micro Wave light is microwaves with frequencies of 0.8 GHz, 1 GHz, 2.45 GHz, 5 GHz, 8 GHz, 12 GHz, and 18 GHz that cause water molecule vibration.

According to another aspect of the present invention, a road condition detection device is provided that can accurately detect the road surface condition using laser backscattering generated by water molecule vibration on the road.

According to one embodiment of the present invention, a laser sensor; A transmitter that transmits microwave light for vibrating water molecules present on the target road to the target road; And sending a plurality of first laser beams and second laser beams of different wavelengths through the laser sensor before the microwave light is applied to the target road by the transmitter and after the microwave light is applied to the target road. A road condition detection device may be provided including a processor that detects the target road surface condition by analyzing the first reflected wave and the second reflected wave backscattered by irradiating the target road.

The laser sensor may receive the first reflected wave and the second reflected wave by horizontally polarizing and vertically polarizing them, respectively.

According to another embodiment of the present invention, a first laser source that irradiates a laser beam of a first wavelength; a second laser source that irradiates a laser beam of a second wavelength; a third laser source that irradiates a laser beam of a third wavelength; a first light receiving unit that receives the backscattered first reflected wave; a second light receiving unit that receives the backscattered second reflected wave; A transmitter that transmits microwave light to vibrate water molecules present on the target road to the target road; And before the microwave light is applied to the target road by the transmitter and after the microwave light is applied to the target road, a first laser beam and a second laser beam are generated through the first to third laser sources, respectively. Road condition detection including a processor that controls to irradiate a laser beam and detects the target road surface condition by analyzing the back-scattered first reflected wave and the second reflected wave received through the first light receiver and the second light receiver. A device may also be provided.

A vertical polarizer is located at the front end of one of the first light receiver and the second light receiver, and a horizontal polarizer is located at the front end of the other one of the first light receiver and the second light receiver. The light receiving unit may receive the vertically polarized and horizontally polarized first and second reflected waves.

According to another embodiment of the present invention, a transmitter that transmits microwave light for vibrating water molecules present on the target road to the target road; A laser beam of a first to third wavelength is radiated, respectively, before the microwave light is applied to the target road by the transmitter and after the microwave light is applied to the target road, respectively. A laser source that irradiates a laser beam of; And backscattering of the first laser beam and the second laser beam respectively irradiated by the laser source before the microwave light is applied to the target road by the transmitter and after the microwave light is applied to the target road. A road condition detection device may be provided including a camera that acquires and analyzes the first reflected wave and the second reflected wave to detect the target road surface condition.

The camera can obtain the backscattered first and second reflected waves of the first and second laser beams respectively irradiated by the laser source by horizontally polarizing and vertically polarizing them.

The cameras may be plural.

By providing a road condition detection method and device according to an embodiment of the present invention, there is an advantage in that the road surface condition can be accurately detected using laser backscattering generated by water molecule vibration on the road.

FIG. 1 is a diagram illustrating a road condition detection system 100 according to an embodiment of the present invention.
Figure 2 is a block diagram schematically showing the internal configuration of a road condition detection device according to an embodiment of the present invention.
Figure 3 is a flowchart showing a road condition detection method according to an embodiment of the present invention.
Figure 4 is a block diagram schematically showing the internal configuration of a road condition detection device according to another embodiment of the present invention.

As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “consists of” or “comprises” should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or steps may be included in the specification. It may not be included, or it should be interpreted as including additional components or steps. In addition, terms such as "... unit" and "module" used in the specification refer to a unit that processes at least one function or operation, which may be implemented as hardware or software, or as a combination of hardware and software. .

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

FIG. 1 is a diagram illustrating a road condition detection system 100 according to an embodiment of the present invention.

As shown in FIG. 1, the road condition detection device 130 according to an embodiment of the present invention can be mounted on a vehicle to detect road conditions while driving and inform the driver of dangerous road conditions. In FIG. 1, the road condition detection device 130 is shown as being located at the front upper part of the vehicle. However, the attachment position of the road condition detection device 130 is not limited to this, and is located at a location where it is easy to detect the road condition in front. It can be applied without restrictions.

For example, assume a situation where black ice 102 exists on the target road 101. The road condition detection device 130 transmits laser beams 110a of three different wavelengths with high water molecule absorption ability on the road 101 while driving, and receives the reflected reflected wave 110b to determine the road condition (e.g. For example, black ice, dry roads, wet roads, and snow-covered roads) can be detected.

At this time, a plurality of laser beams with different wavelengths are transmitted on the target road 101 at different times to receive reflected waves, but microwave light is transmitted on the target road between different times. It can vibrate existing water molecules.

That is, the road condition detection device 130 detects the microwave light 120 at a time before transmitting the microwave light 120 to the target road (the first time) and while transmitting or transmitting the microwave light to the target road (for convenience, the second time). ), each of which has a different wavelength can be transmitted to receive reflected waves.

As the microwave light is incident on the target road, the target road (or black ice (water molecules) on the target road) vibrates, causing the electric dipoles of the water molecules before transmitting the microwave light to be arranged in a random direction. Laser backscattering and laser backscattering have different characteristics when the electric dipole direction of water molecules is aligned consistently after applying microwave light.

The road condition detection device 130 according to an embodiment of the present invention uses laser backscattering when the electric dipoles of water molecules are arranged in a random direction before transmitting microwave light and the backscattering of water molecules after applying microwave light. If the electric dipole direction is arranged consistently, laser backscattering can accurately detect the presence or absence of black ice on the target road using different characteristics.

Figure 2 is a block diagram schematically showing the internal configuration of a road condition detection device according to an embodiment of the present invention.

Referring to FIG. 2, the road condition detection device 130 according to an embodiment of the present invention includes a laser sensor 210, a transmitter 220, a memory 230, and a processor 240.

The laser sensor 210 is a means for receiving a reflected wave after irradiating a plurality of laser beams of different wavelengths onto a target road.

At this time, the laser sensor 210 may radiate a plurality of laser beams of different wavelengths onto the target road at the first and second time points under the control of the processor 240 and receive reflected waves. Here, the first viewpoint and the second viewpoint are different viewpoints. That is, the laser sensor 210 may irradiate a plurality of laser beams with different wavelengths to the target at different times under the control of the processor 240.

In more detail, the laser sensor 210 is controlled by the processor 240 at a first time point before the microwave is transmitted to the target road by the transmitter 220 and the microwave is transmitted to the target road by the transmitter 220. At a second time point after being transmitted, a plurality of laser beams each having different wavelengths may be transmitted and each reflected wave may be received.

For convenience, hereinafter, the laser beam transmitted to the target road at the first time point before the microwave is transmitted to the target road by the transmitter 220 is referred to as the first laser beam, and the reflected signal of the first laser beam is referred to as the first laser beam. Let's call it a reflected wave. In addition, the laser beam transmitted to the target road at the second time point after the microwave is transmitted to the target road by the transmitter 220 is referred to as the second laser beam, and the signal reflected from the second laser beam is referred to as the second reflected signal. Let's call it Para.

For example, the laser sensor 210 may transmit laser beams having three wavelengths that are highly absorbed by water molecules to the target road as first and second laser beams.

That is, the laser sensor 210 can transmit a first laser beam having three wavelengths (i.e., 0.6μm, 1.6μm, 2.15μm or 980nm, 1310 nm, 1550nm) that are highly absorbed by water molecules on the target road. there is.

Subsequently, the laser sensor 210 may each receive a first reflected wave in which the first laser beam is reflected from the target road. At this time, the laser sensor 210 may receive the first reflected wave by horizontally polarizing and vertically polarizing it.

In addition, the laser sensor 210 transmits microwave light to the target road under the control of the processor 240 to vibrate the water molecules of the black ice present on the target road, and then transmits it to the target road at a second time. A second reflected wave can be received by transmitting a laser beam having three wavelengths that are highly absorbed by water molecules.

At this time, the laser sensor 210 may receive the second reflected wave by horizontally polarizing and vertically polarizing it.

The transmitter 220 transmits microwave light on the target road under the control of the processor 240. Here, the microwave light may be in the 1GHz to 300HGz band. Microwaves can cause the electric dipole direction of water molecules to match the incident frequency (i.e., create a phase delay), causing vibration of water molecules.

Water molecules have an asymmetric molecular structure, which has the property of forming an electric dipole and matching its direction according to an externally applied electric field.

The polarity change of approximately 0.8GHz, 1GHz, 2.45GHz, 5GHz, 8GHz, 12GHz, 18GHz microwave light causes the water molecules to vibrate along with the phase delay of the dipole water molecules, and friction between water molecules converts the absorbed energy into heat energy. You can do it. The spectral absorption properties of ice are similar to those of water, 3400 (2.941μm), 3220 (3.105μm) and 1620 It shows peak characteristics at (6.17μm).

According to an embodiment of the present invention, road conditions can be detected using laser backscattering generated by water molecule vibration.

The memory 230 stores various commands (program codes) necessary to perform a method of detecting road conditions using laser backscattering using water molecule vibrations according to an embodiment of the present invention.

The processor 240 controls the internal components (e.g., laser sensor 210, transmitter 220, memory 230, etc.) of the road condition detection device 130 according to an embodiment of the present invention. It is a means for

In addition, the processor 240 controls the laser sensor 210 to transmit a plurality of first laser beams having different wavelengths on the target road at a first time and to receive the first reflected wave reflected from the target road. can do.

Next, the processor 240 may control the transmitter 220 to transmit microwave light to the target road. As the microwave light is incident on the target road, the target road (or black ice existing on the target road) may vibrate.

After the microwave light vibrates the target road, the processor 240 controls the laser sensor 210 to transmit a plurality of second laser beams having different wavelengths on the target road and the second reflected wave reflected from the target road. You can control it to receive.

The processor 240 may detect the status of the target road (i.e., presence of black ice, dry road, wet road, snow-covered road) using the first reflected wave and the second reflected wave.

More specifically, the first reflected wave and the second reflected wave may be horizontally polarized and vertically polarized signals, respectively, as described above.

The processor 240 sends a laser beam of three wavelengths having two polarizations into two vibration states: before and after the microwave light is applied to the target road (more specifically, while the microwave light is applied to the target road). Road conditions can be judged (detected) using signals of 12 states.

In summary, the processor 240 performs laser backscattering when the electric dipoles of water molecules are arranged in a random direction before transmitting the microwave light, and the direction of the electric dipoles of the water molecules is arranged consistently after applying the microwave light. If possible, laser backscattering can increase the accuracy of road conditions by using other characteristics.

Figure 3 is a flowchart showing a road condition detection method according to an embodiment of the present invention.

In step 310, the road condition detection device 130 transmits first laser beams having different wavelengths to the target road and receives the first reflected wave. Here, the first reflected wave may be vertically polarized and horizontally polarized.

The road condition detection device 130 may transmit a plurality of laser beams having different wavelengths that are highly absorbent to water molecules to the target road. For example, a first laser beam in a band of 0.6 μm, 1.6 μm, 2.15 μm, or 980 nm, 1310 nm, or 1550 nm may be transmitted. At this time, the road condition detection device 130 may transmit first laser beams having different wavelengths using one laser source, and may transmit first laser beams having different wavelengths using a plurality of laser sources transmitting laser beams of different wavelengths. Beams can also be transmitted.

That is, the horizontally polarized 1-1 reflected wave and the vertically polarized 1-2 reflected wave of the reflected wave from which the first laser light for the first wavelength is reflected are received, and the reflected wave from which the first laser light for the second wavelength is reflected is received. The horizontally polarized 1-3 reflected wave and the vertically polarized 1-4 reflected wave are received, and the horizontally polarized 1-5 reflected wave and the vertically polarized 1st laser light for the third wavelength are received. -6 reflected waves can be received respectively.

To summarize, after three laser beams having three different wavelengths are transmitted to the target road, laser backscattered reflected waves may be received, and a first reflected wave of three wavelengths having two polarizations may be received.

Next, in step 315, the road condition detection device 130 transmits microwave light to the target road or the target road for water molecule vibration.

Here, the microwave light may be in the 1GHz to 100GHz band. As described above, water molecules have an asymmetric molecular structure, which has the property of forming an electric dipole and matching its direction according to an externally applied electric field.

In addition, the polarity change of microwave light in the 1GHz to 100GHz band causes dipole water molecules to vibrate with phase delay, and the friction between molecules converts the absorbed energy into heat energy.

Therefore, in one embodiment of the present invention, it is assumed that microwave light in the 1 GHz to 100 GHz band is transmitted. Preferably, the microwave light may have a frequency of 0.8 GHz, 1 GHz, 2.45 GHz, 5 GHz, 8 GHz, 12 GHz, or 18 GHz.

In step 320, the road condition detection device 130 transmits a second laser beam having a different wavelength to the target road while the microwave light is transmitted to the target road to vibrate the target road or water molecules, and the reflected second laser beam Receive reflected waves. Here, the second reflected wave may be vertically polarized and horizontally polarized.

As described above, the horizontally polarized 2-1 reflected wave and the vertically polarized 2-2 reflected wave of the reflected wave from which the second laser light for the first wavelength is reflected are received, and the second laser light for the second wavelength is received. The horizontally polarized 2-3 reflected wave and the vertically polarized 2-4 reflected wave of the reflected reflected wave are received, and the second laser light for the third wavelength is perpendicular to the horizontally polarized 2-5 reflected wave of the reflected reflected wave. Polarized second to sixth reflected waves may be received, respectively.

That is, after three laser beams having three different wavelengths are transmitted to the target road, laser backscattered reflected waves are received, and a second reflected wave of three wavelengths having two polarizations can be received.

In step 325, the road condition detection device 130 detects the road condition using the first reflected wave and the second reflected wave.

That is, the road condition detection device 130 sends a laser beam of three wavelengths having two polarizations before and after the microwave light is applied to the target road (more specifically, while the microwave light is applied to the target road). ), the road condition can be judged (detected) using 12 state signals according to the two vibration states.

The road condition detection device 130 uses laser backscattering when the electric dipoles of water molecules are arranged in a random direction before transmitting the microwave light, and laser backscattering when the electric dipoles of the water molecules are arranged in a constant direction after applying the microwave light. In this case, laser backscattering can increase the accuracy of road conditions by using different characteristics.

Figure 4 is a block diagram schematically showing the internal configuration of a road condition detection device according to another embodiment of the present invention.

Referring to FIG. 4, the road condition detection device 400 according to another embodiment of the present invention includes a first laser source 410a, a second laser source 410b, a third laser source 410c, and a first sensor ( 420a), a second sensor 420b, a transmitter 430, a memory 440, and a processor 450.

The first laser source 410a transmits a laser beam of a first wavelength.

The second laser source 410b transmits a laser beam of a second wavelength.

The third laser source 410c transmits a laser beam of a third wavelength.

Here, the first to third wavelengths are different wavelengths and have high water molecule absorption power, and may be 0.6 μm, 1.6 μm, 2.15 μm, or 980 nm, 1310 nm, and 1550 nm.

The first sensor 420a receives a reflected wave in which the laser beam transmitted by the first to third laser sources 410a to 410c is backscattered.

For example, the first sensor 420a may be a light receiving module or a camera.

The second sensor 420b receives a reflected wave in which the laser beam transmitted by the first to third laser sources 410a to 410c is backscattered.

For example, the second sensor 420b may be a light receiving module or a camera.

The first sensor 420a and the second sensor 420b receive reflected waves in which the laser beam transmitted by the first to third laser sources 410a to 410c is backscattered, but the signals may be differently polarized. .

For example, the first sensor 420a may receive a vertically polarized reflected wave, and the second sensor 420b may receive a horizontally polarized reflected wave. The first sensor 420a and the second sensor 420b may receive the reflected wave and then vertically polarize it or horizontally polarize it.

For another example, different polarizers may be arranged in front of the first sensor 420a and the second sensor 420b. That is, a vertical polarizer may be arranged at the front of the first sensor 420a, and a horizontal polarizer may be arranged at the front of the second sensor 420b. Accordingly, the first sensor 420a may receive a vertically polarized reflected wave, and the second sensor 420b may receive a horizontally polarized reflected wave.

As another example, the sensor may be a camera. In this case, the sensor performs backscattering of the first and second laser beams respectively irradiated by the laser source before the microwave light is applied to the target road and after the microwave light is applied to the target road. The target road surface condition may be detected by acquiring and analyzing the first and second reflected waves.

The transmitter 430 transmits microwave light on the target road under the control of the processor 240. Since this is the same as described above in FIG. 1, redundant description will be omitted.

The memory 440 stores various commands (program codes) for performing a method of detecting road conditions using water molecule vibration characteristics and laser backscattering according to another embodiment of the present invention.

The processor 450 includes a road condition detection device 130 according to another embodiment of the present invention, a first laser source 410a, a second laser source 410b, a third laser source 410c, and a first sensor 420a. ), the second sensor 420b, the transmitter 430, the memory 440, etc.).

Additionally, the processor 450 may control the first to third laser sources 410a to 410c to transmit first laser beams having different wavelengths onto the target road at a first time.

The first sensor 420a and the second sensor 420b may each receive the first reflected wave backscattered on the target road. Here, the first sensor 420a and the second sensor 420b may receive first reflected waves having different polarization characteristics.

Next, the processor 450 may control the transmitter 430 to transmit microwave light on the target road. Accordingly, microwave light is incident on the target road, which causes the target road and/or water molecules present on the target road to vibrate.

After the microwave light is transmitted on the target road by the transmitter 430, the processor 450 targets the first laser source 410a to the third laser source 410c with second laser beams having different wavelengths. It is controlled to transmit on the road, and second reflected waves having different polarization characteristics can be received through the first sensor 420a and the second sensor 420b.

The processor 450 may detect road conditions using the first reflected wave and the second reflected wave. That is, as described above, the processor 450 sends a laser beam of three wavelengths having two polarizations before and after the microwave light is applied to the target road (more specifically, after the microwave light is applied to the target road). Road conditions can be judged (detected) using 12 state signals according to two vibration states (during driving).

The processor 450 performs laser backscattering when the electric dipoles of water molecules are arranged in a random direction before transmitting the microwave light, and laser backscattering when the electric dipoles of the water molecules are arranged in a constant direction after applying the microwave light. The accuracy of road conditions can be improved by using different catering characteristics.

Devices and methods according to embodiments of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. Computer-readable media may include program instructions, data files, data structures, etc., singly or in combination. Program instructions recorded on a computer-readable medium may be specially designed and constructed for the present invention or may be known and usable by those skilled in the computer software field. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -Includes magneto-optical media and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. Examples of program instructions include machine language code, such as that produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

So far, the present invention has been examined focusing on its embodiments. A person skilled in the art to which the present invention pertains will understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the equivalent scope should be construed as being included in the present invention.

130: Road condition detection device
210: laser sensor
220: Transmitter
230: memory
240: processor

Claims (12)

(a) radiating a plurality of first laser beams of different wavelengths onto a target road and receiving the reflected first laser beams;
(b) transmitting microwave light to vibrate water molecules present on the target road to the target road;
(c) radiating a plurality of second laser beams of different wavelengths onto the target road and receiving a reflected second laser beam; and
(d) detecting the target road surface condition by analyzing the reflected first laser beam and the reflected second laser beam.
According to claim 1,
The target road surface condition is a dry road, a wet road, a snow-covered road, and the presence or absence of black ice.
According to claim 1,
In steps (a) and (c),
A road condition detection method characterized in that the reflected first laser beam and the reflected second laser beam are horizontally polarized and vertically polarized for reception.
According to clause 3,
A road wherein the target road surface condition is detected using spectral characteristics of the reflected first laser beam and the reflected second laser beam that are horizontally polarized and vertically polarized and received through a horizontal polarizer and a vertical polarizer. Status detection method.
According to claim 1,
The plurality of first laser beams of different wavelengths and the plurality of second laser beams of different wavelengths are laser beams of 0.6 μm, 1.6 μm, 2.15 μm, or 980 nm, 1310 nm, and 1550 nm with high water molecule absorption,
A road condition detection method, characterized in that the microwave light is a microwave of at least one of the frequencies of 0.8 GHz, 1 GHz, 2.45 GHz, 5 GHz, 8 GHz, 12 GHz, and 18 GHz, which cause water molecule vibration.
laser sensor;
A transmitter that transmits microwave light for vibrating water molecules present on the target road to the target road; and
Before the microwave light is applied to the target road by the transmitter and after the microwave light is applied to the target road, a plurality of first laser beams and second laser beams of different wavelengths are transmitted through the laser sensor. A road condition detection device comprising a processor that detects the target road surface condition by analyzing the first reflected wave and the second reflected wave backscattered by irradiating the target road.
According to clause 6,
The laser sensor is,
A road condition detection device characterized in that the first reflected wave and the second reflected wave are received by being horizontally polarized and vertically polarized, respectively.
a first laser source that irradiates a laser beam of a first wavelength;
a second laser source that irradiates a laser beam of a second wavelength;
a third laser source that irradiates a laser beam of a third wavelength;
a first light receiving unit that receives the backscattered first reflected wave;
a second light receiving unit that receives the backscattered second reflected wave;
A transmitter that transmits microwave light to vibrate water molecules present on the target road to the target road; and
Before the microwave light is applied to the target road by the transmitter and after the microwave light is applied to the target road, a first laser beam and a second laser are transmitted through the first to third laser sources, respectively. A road condition detection device including a processor that controls to emit a beam and detects the target road surface condition by analyzing the backscattered first reflected wave and the second reflected wave received through the first light receiver and the second light receiver. .
According to clause 8,
A vertical polarizer is located at the front end of either the first light receiving unit or the second light receiving unit,
A horizontal polarizer is located at the front end of the other of the first light receiving unit and the second light receiving unit,
The first light receiving unit and the second light receiving unit receive vertically polarized and horizontally polarized first and second reflected waves.
A transmitter that transmits microwave light for vibrating water molecules present on the target road to the target road;
A laser beam of a first to third wavelength is radiated, respectively, before the microwave light is applied to the target road by the transmitter and after the microwave light is applied to the target road, respectively. A laser source that irradiates a laser beam of; and
Backscattering of the first and second laser beams respectively irradiated by the laser source before the microwave light is applied to the target road by the transmitter and after the microwave light is applied to the target road A road condition detection device including a camera that acquires and analyzes a reflected wave and a second reflected wave to detect a target road surface condition.
According to claim 10,
The camera is a road condition detection device characterized in that the backscattered first and second reflected waves of the first and second laser beams respectively irradiated by the laser source are horizontally polarized and vertically polarized to obtain the backscattered waves.
According to claim 10,
A road condition detection device, characterized in that the cameras are plural.