Laser radar apparatus for measuring direction and distance of an object
By using mirror assemblies and rotating drives with through holes and reflective surfaces in lidar equipment, the problem of reduced beam splitting efficiency when the laser beam passes through the optical frequency isolator is solved, achieving higher detection accuracy and small size design .
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no. 1 example
[0028] Referring to FIGS. 1-3 , a laser radar device according to a first embodiment of the present invention will be described below.
[0029] FIG. 1 is a schematic diagram of a lidar device 100 according to a first embodiment of the present invention.
[0030] According to FIG. 1 , a laser radar device 100 includes a laser diode 10 and a photodiode 20 . The laser radar device 100 is designed to calculate the phase difference between the output light L0 emitted by the laser diode 10 and the input light L3 reflected by the object and received by the photodiode 20, or the speed of light between the output light L0 emission and the input light L3 reception. The time-of-flight detects the orientation of an object located in the measurement area, if the object exists, and the distance from the lidar device to the object. In this embodiment, laser diode 10 emits laser pulses.
[0031] In response to a command signal from a laser diode controller not shown in FIG. 1 , the laser di...
no. 2 example
[0067] Referring to FIGS. 4-7, a laser radar device according to a second embodiment of the present invention will be described below.
[0068] FIG. 4 is a schematic diagram of a laser radar device 100A according to a second embodiment of the present invention.
[0069] In this embodiment, the difference from the previous embodiment is the presence of the beam splitting device 80 and the improved method of operating the controller 82 and the memory 84 . Therefore, a detailed discussion of components of the lidar device having the same functions and structures as those used in the previous embodiment will be omitted below.
[0070] As shown in FIG. 4 , the lidar device 100A according to the present invention includes a mirror assembly 300A, a controller 82 and a memory 84 . The controller 82 and the memory 84 correspond to a control device and a storage device, respectively. In this embodiment, the projection optical system includes a laser diode 10 as an element of laser bea...
no. 3 example
[0096] Referring to Fig. 8, a lidar device 100B according to a third embodiment of the present invention will be described below.
[0097] FIG. 8 is a schematic diagram of a laser radar device 100B according to a third embodiment of the present invention.
[0098] In this embodiment, the difference from the first embodiment lies in the first cover 92 having the first slit 93 and the second cover 95 having the second slit 96 . Therefore, a detailed discussion of the components of the laser radar device having the same function and structure as those used in the first embodiment will be omitted.
[0099] As in the case of the first embodiment, the mirror 30 is arranged at a predetermined angle, for example, at an angle of 45 degrees with respect to the axis of the output laser beam L0. Also, the mirror 30 has a through hole 32 through which the output laser beam L0 passes without any loss of intensity. Also, the mirror 30 has a reflection plate 31 that reflects the input laser...
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