Light detection and ranging sensors with multiple emitters and multiple receivers, and associated systems and methods
Systems and techniques associated light detection and ranging (LIDAR) applications are described. In one representative aspect, techniques can be used to implement a packaged semi-conductive apparatus is disclosed. The apparatus includes a substrate; a diode die carried by the substrate and positioned to emit an electromagnetic energy beam; and a shell coupled to the substrate to enclose the diode die. The shell includes an opening or a transparent area to allow the electromagnetic energy beam emitted from the diode die to pass through the shell.
1. A sensor apparatus, comprising:
a source that comprises one or more diodes configured to emit at least one electromagnetic energy beam;
a reflector configured to reflect the at least one electromagnetic energy beam emitted from the source, the reflector including a plurality of reflective surfaces configured to reflect at least two parts of the at least one electromagnetic energy beam emitted from the source to form at least two reflected electromagnetic beams, the at least two parts being substantially parallel to each other, and the at least two reflected electromagnetic beams being not parallel to each other; and
a receiver configured to receive at least one returned electromagnetic energy beam reflected from one or more objects in an external environment and convert light signals from the at least one returned electromagnetic energy beam to one or more electrical signals, the receiver including a plurality of receiver units, and the plurality of receiver units having a one-to-one correspondence with the plurality of reflective surfaces of the reflector.
2. The apparatus of claim 1 , wherein:
the source comprises multiple diodes configured to emit multiple electromagnetic energy beams.
3. The apparatus of claim 2 , wherein the multiple diodes are packaged together and configured to emit the multiple electromagnetic energy beams, which are parallel to each other.
4. The apparatus of claim 1 , wherein the reflector includes an array of micro-mirrors.
5. The apparatus of claim 1 , further comprising a beam steering structure configured to receive the at least one electromagnetic energy beam reflected by the reflector and adjust direction of at least one outgoing electromagnetic energy beam.
6. The apparatus of claim 5 , wherein the beam steering structure is configured to direct the at least one returned electromagnetic energy beam reflected from the one or more objects in the external environment toward the receiver.
7. The apparatus of claim 5 , wherein the beam steering structure comprises:
a first optical element, and
an actuator coupled to the first optical element to rotate the first optical element about an axis for adjusting direction of the at least one outgoing electromagnetic energy beam.
8. The apparatus of claim 7 , wherein an angle between an individual outgoing electromagnetic energy beam and the axis changes with time.
9. The apparatus of claim 7 , wherein the first optical element includes a first surface and a second surface, wherein the first surface and the second surface are non-parallel.
10. The apparatus of claim 9 , wherein the first optical element further includes a stabilizer at an end of the first optical element.
11. The apparatus of claim 7 , wherein the beam steering structure comprises a second optical element configured to rotate around the axis at a different speed than the first optical element.
12. The apparatus of claim 5 , the beam steering structure further comprises a scanning mirror.
13. The apparatus of claim 5 , wherein the reflector is located along a different axis than an optical axis of a collimator.
14. The apparatus of claim 1 , further comprising:
a collimator positioned between the source and the reflector, and including an array of micro-lenses.
15. An apparatus comprising:
a source that comprises one or more diodes configured to emit at least one electromagnetic energy beam;
a reflector configured to reflect the at least one electromagnetic energy beam emitted from the source, the reflector including a plurality of reflective surfaces that are not parallel to each other, and positions of the plurality of reflective surfaces and a position of the source being fixed; and
a receiver configured to receive at least one returned electromagnetic energy beam reflected from one or more objects in an external environment and convert light signals from the at least one returned electromagnetic energy beam to one or more electrical signals;
wherein the receiver includes a plurality of receiver units, the plurality of receiver units having a one-to-one correspondence with the plurality of reflective surfaces of the reflector.
16. The apparatus of claim 15 , further comprising:
a beam steering structure configured to receive the at least one electromagnetic energy beam reflected by the reflector and adjust direction of at least one outgoing electromagnetic energy beam, the beam steering structure including:
a first optical element, and an actuator coupled to the first optical element to rotate the first optical element about an axis for adjusting direction of the at least one outgoing electromagnetic energy beam.
17. The apparatus of claim 16 , wherein the first optical element includes a first surface and a second surface, wherein the first surface and the second surface are non-parallel.
18. The apparatus of claim 16 , wherein the beam steering structure further includes a second optical element configured to rotate around the axis at a different speed than the first optical element.