Laser detection device using line beam, and vehicle information recognition method using same

A laser beam apparatus that is used for detecting vehicles in an intelligent traffic system, the apparatus comprising:

• a light source generating a laser beam of a pulse;
• an optical transmission system converting the laser beam into a line beam;
• and
• an optical reception system receiving a beam dispersed rearward and reflected and returned when the line beam is radiated to a vehicle, and calculating a distance value from a reception time difference between the laser beam and the reflected beam,
• wherein a first lens and a second lens that receive a laser from the light source are sequentially arranged in the optical transmission system, wherein the first lens changes the length of the horizontal axis of the line beam and the second lens changes the length of a vertical axis of the line beam.

A laser beam apparatus that is used for detecting vehicles in an intelligent traffic system, the apparatus comprising:

• a light source generating a laser beam of a pulse;
• an optical transmission system converting the laser beam into a line beam;
• and
• an optical reception system receiving a beam dispersed rearward and reflected and returned when the line beam is radiated to a vehicle, and calculating a distance value from a reception time difference between the laser beam and the reflected beam,
• wherein a first lens and a second lens that receive a laser from the light source are sequentially arranged in the optical transmission system, wherein assuming that the front of the vehicle is vertical and has a height y1, the line beam reaches first the lower end of the front of the vehicle, the speed of the vehicle is measured on the basis of the movement distance of the front, wherein the speed of the vehicle is expressed as in the following Equation,
• x
• 0
• -
• x
• 1
• =
• (
• z
• 0
• -
• z
• 1
• )
• ×
• cos
• ⁢
• ⁢
• θ
• ,
• v
• =
• x
• 0
• -
• x
• 1
• t
• where y0 is the vertical distance between the ground and the laser detection apparatus, y1 is the height of the portion, which is perpendicular to the ground, of the front of the vehicle, z0 is the distance between the vehicle and the laser detection apparatus when the vehicle is sensed first, θ is the angle between the ground and the laser detection apparatus, t is a time taken to measure the displacement of the vehicle from z0 to z1, x0 is the distance between the vehicle and a position where a scanner is installed when the vehicle is sensed first, and x1 is the distance between the vehicle and the position where the scanner is installed when the vehicle is sensed after x0.