US 8836922 B1 Devices and methods for a rotating LIDAR platform with a shared transmit/receive path |
1. A light detection and ranging (LIDAR) device, comprising: a lens mounted to a housing, wherein the housing is configured to rotate about an axis and has an interior space that includes a transmit block, a receive block, a transmit path, and a receive path, wherein the transmit block has an exit aperture in a wall that comprises a reflective surface, wherein the receive block has an entrance aperture, wherein the transmit path extends from the exit aperture to the lens, and wherein the receive path extends from the lens to the entrance aperture via the reflective surface; a plurality of light sources in the transmit block, wherein the plurality of light sources are configured to emit a plurality of light beams through the exit aperture in a plurality of different directions, the light beams comprising light having wavelengths in a wavelength range; a plurality of detectors in the receive block, wherein the plurality of detectors are configured to detect light having wavelengths in the wavelength range; and wherein the lens is configured to receive the light beams via the transmit path, collimate the light beams for transmission into an environment of the LIDAR device, collect light comprising light from one or more of the collimated light beams reflected by one or more objects in the environment of the LIDAR device, and focus the collected light onto the detectors via the receive path. |
US 9086273 B1 Microrod compression of laser beam in combination with transmit lens |
1. A light detection and ranging (LIDAR) device, comprising: at least one laser diode, wherein the at least one laser diode is configured to emit an uncollimated laser beam comprising light in a narrow wavelength range, wherein the uncollimated laser beam has a first divergence in a first direction and a second divergence in a second direction, and wherein the first divergence is greater than the second divergence; at least one cylindrical lens, wherein the at least one cylindrical lens is configured to pre-collimate the uncollimated laser beam in the first direction to provide a partially collimated laser beam that has a third divergence in the first direction and a fourth divergence in the second direction, wherein the third divergence is less than the fourth divergence and the fourth divergence is substantially equal to the second divergence; at least one detector, wherein the at least one detector is configured to detect light having wavelengths in the narrow wavelength range; and an objective lens, wherein the objective lens is configured to (i) collimate the partially collimated laser beam to provide a collimated laser beam for transmission into an environment of the LIDAR device and (ii) focus object-reflected light onto the at least one detector, wherein the object-reflected light comprises light from the collimated laser beam that has reflected from one or more objects in the environment of the LIDAR device. |
US 9368936 B1 Laser diode firing system |
17. A light detection and ranging (LIDAR) device comprising: a light source including: a voltage source; an inductor coupled to the voltage source, wherein the inductor is configured to store energy in a magnetic field; a diode coupled to the voltage source via the inductor; a transistor configured to be turned on and turned off by a control signal; a light emitting element coupled to the transistor; a capacitor coupled to a charging path and a discharge path, wherein the charging path includes the inductor and the diode, and wherein the discharge path includes the transistor and the light emitting element; wherein, responsive to the transistor being turned off, the capacitor is configured to charge via the charging path such that a voltage across the capacitor increases from a lower voltage level to a higher voltage level and the inductor is configured to release energy stored in the magnetic field such that a current through the inductor decreases from a higher current level to a lower current level; and wherein, responsive to the transistor being turned on, the capacitor is configured to discharge through the discharge path such that the light emitting element emits a pulse of light and the voltage across the capacitor decreases from the higher voltage level to the lower voltage level and the inductor is configured to store energy in the magnetic field such that the current through the inductor increases from the lower current level to the higher current level; a light sensor configured to detect a reflected light signal comprising light from the emitted light pulse reflected by a reflective object; and a controller configured to determine a distance to the reflective object based on the reflected light signal. |
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