Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
  • G01S17/88—Lidar systems specially adapted for specific applications
  • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging

Definitions

• the present invention relates to detecting the presence of distant objects, and, more particularly, to detecting the presence of distant objects from a motor vehicle.
• the invention will provide a solution to the early warning problem in inclement weather by detecting the presence of obstacles up to two kilometers away.
• the invention may set off audio and visual alarms in order to alert the driver before he arrives at any potential obstacles, thus preventing accidents.
• the invention may be able to operate in the presence of air-borne particles, such as fog, heavy rain, smoke or dust.
• the invention will be able to operate in darkness.
• the system of the invention may include a unique mid infrared 4000 nanometer solid state laser and a 4000 nanometer mid infrared array detector for providing a long distance early warning alert system for vehicles.
• the inventive system is particularly advantageous in inclement weather when water particles in the air may significantly degrade the performance of prior art systems.
• the inventive system may be capable of detecting obstacles within a range of up to two kilometers through inclement weather and low visibility conditions such as night, heavy rain and fog.
• the inventive system may achieve good image reception in inclement weather by using at least one phase conjugate lens to reduce image and phase distortion due to atmospheric conditions.
• the invention may enable an early warning visible alarm and/or audible alarm to be given off or issued when an obstacle is a distance of one mile away, if the user so desires.
• the inventive system may avoid road fatalities during heavy fog, smoke and rain in daylight or night.
• the invention comprises, in one form thereof, a method of warning a driver of a vehicle of an obstacle that is more than one kilometer from the vehicle.
• MIR laser energy is emitted from the vehicle.
• the laser energy has a wavelength approximately between 3500 nanometers and 5000 nanometers.
• a phase conjugate lens is used to orthogonally direct a portion of the laser energy that is reflected by the obstacle to an image-capturing device or sensor within the vehicle.
• An image of the obstacle is displayed to the driver. The image is based on the laser energy directed to the image-capturing device.
• the invention comprises, in another form thereof, an obstacle early warning system for a vehicle.
• a laser emits MIR laser energy from the vehicle.
• the laser energy has a wavelength approximately between 3500 nanometers and 5000 nanometers.
• a phase conjugate lens receives a portion of the laser energy that is reflected by the obstacle, and orthogonally directs the portion of the laser energy to a sensor.
• a display device displays an image of the obstacle to the driver. The image is based on the laser energy directed to the sensor.
• the invention comprises, in yet another form thereof, a method of warning a driver of a vehicle of an obstacle that is more than one kilometer from the vehicle.
• MIR laser energy is emitted from the vehicle.
• the laser energy has a wavelength approximately between 3500 nanometers and 5000 nanometers.
• a phase conjugate lens is used to direct a portion of the laser energy that is reflected by the obstacle orthogonally to an image-capturing device within the vehicle.
• a representation of the obstacle is displayed to the driver. The representation is based on the laser energy directed to the image-capturing device.
• An advantage of the present invention is that it may alert a driver of obstacles in the road more than a kilometer away, even when there is fog, rain, smoke or snow in the air.
• FIG. 1 is a block diagram illustrating one embodiment of a mid-infrared vehicle early warning laser system of the present invention.
• FIG. 2 is a schematic overhead view of a vehicle illustrating some possible positions of the lens(es) of the system of FIG. 1.
• FIG. 3 illustrates one embodiment of the output of the display of the system of
• FIG. 1 is a block diagram illustrating one embodiment of a mid-infrared vehicle early warning laser system 10 of the present invention for detecting in inclement weather an obstacle 12 up to two kilometers away from system 10.
• Apparatus 10 may be installed in a vehicle 14 (FIG. 2).
• Apparatus 10 may include a mid infrared 4000 nanometer laser 16, a first phase conjugate lens 18, a MIR 4000 nanometer charge-coupled device (CCD) 20, an embedded computer 22 for imaging, and a display 24.
• CCD MIR 4000 nanometer charge-coupled device
• a characteristic of a phase conjugate lens, such as lens 18, is that regardless of the angle at which laser energy 26 impinges upon lens 18, the laser energy exits lens 18 in a direction perpendicular to a longitudinal axis 28 of lens 18, as shown at 30. As shown in FIG. 2, lens 18 may be positioned at a mid-point of a front end 32 of vehicle 14.
• system 10 includes a second phase conjugate lens 34 and a second MIR 4000 nanometer CCD 36.
• first lens 18 may be positioned at one front corner of front end 32 of vehicle 14, as indicated at 38 (FIG. 2), and second lens 34 may be positioned at the other front corner of front end 32 of vehicle 14, as indicated at 40.
• mid infrared laser 16 emits 4000 nanometer laser energy 44 in a forward direction 46 from a front end 32 of vehicle 14.
• Laser energy 44 goes through airborne particles 48, such as rain, fog, smoke, snow or dust, before being reflected by obstacle 12, which may be another vehicle, for example.
• the reflected laser energy 44 again goes through air-borne particles 48 before being re-directed by lens 18 toward CCD 20, as indicated at 30, and being re-directed by lens 34 toward CCD 36, if lens 34 and CCD 36 are present.
• CCDs 20, 36 may include analog-to-digital converters (not shown) for converting analog image signals into digital signal outputs suitable for inputting into computer 22.
• Computer 22 may perform image processing on the image data received from CCDs 20, 36 and may output processed digital image data 49 that can be displayed on display 24.
• Computer 22 may transmit a control signal 50 to laser 16 in order to control pulses of laser energy 44.
• Display 24 may display an image of obstacle 12 that is recognizable by the driver of vehicle 14. Thus, the driver may be able to see on display 24 an obstacle that is too far away for the driver to see in an unassisted fashion through a front windshield 52 of vehicle 14. [0021 ] In another embodiment, instead of displaying a recognizable image of obstacle
• display 24 may display a symbol or icon that represents obstacle 12.
• display 24 may display an overhead or mapped view of an area up to two kilometers in front of the vehicle.
• display 24 may illustrate the sensed location of obstacle 12 with a symbol, icon, or other representation.
• FIG. 3 illustrates a display 24 displaying an overhead or mapped view of an area up to two kilometers in front of the vehicle including a two kilometer segment of roadway 52, the location and shape of which may be received from an in-vehicle navigation system (not shown).
• An obstacle 12 on roadway 52 may be represented by a symbol 54 on display 24.
• Display 24 may include markings illustrating the distance of points on the display from the vehicle. In FIG. 3 there are two arcs showing points that are one kilometer and two kilometers away, respectively, from the vehicle.
• Mid infrared laser 16, CCD 20, and CCD 36 are described herein as operating at 4000 nanometers. However, it is possible within the scope of the invention for these devices to operate at a wavelength other than 4000 nanometers. In one embodiment, these devices may operate at any wavelength within a range of approximately between 3500 nanometers and 5000 nanometers.

Landscapes

• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Electromagnetism (AREA)
• General Physics & Mathematics (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Optical Radar Systems And Details Thereof (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=55178606

Family Applications (1)

Country Status (1)

Family Cites Families (1)

• 2014
  • 2014-04-25 EP EP14788644.4A patent/EP2988971A4/de not_active Withdrawn

Also Published As

Similar Documents

Legal Events