Lidar device

Patent metadata

Field	Value
Publication number	US-11454708-B2
Application number	US-201916601714-A
Country	US
Kind code	B2
Filing date	Oct 15, 2019
Priority date	Oct 17, 2018
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

A LIDAR device is described including a beam source for emitting electromagnetic radiation in an emission path, in which at least one holographic optical element is situated for diffracting the emitted electromagnetic radiation, and a detector for detecting incident electromagnetic radiation in a reception path, an optical bandpass filter being connected upstream from the detector. Depending on a wavelength of the emitted electromagnetic radiation, the holographic optical element effectuates a diffraction by at least one angle of reflection which is matched to the shift of the wavelength of the incident electromagnetic radiation with the aid of the bandpass filter.

First claim

What is claimed is:

1. A LIDAR device, comprising:
a beam source configured to emit electromagnetic radiation in an emission path, in which at least one holographic optical element is situated for diffracting the emitted electromagnetic radiation;
a detector configured to detect incident electromagnetic radiation in a reception path, an optical bandpass filter being connected upstream from the detector; and
a second holographic optical element configured to deflect electromagnetic radiation emitted in the second predetermined wavelength range by a second angle of reflection;
wherein, depending on a wavelength of the emitted electromagnetic radiation, the holographic optical element effectuates a diffraction by at least one angle of reflection which is matched to a shift of a wavelength of the incident electromagnetic radiation using the bandpass filter,
wherein the LIDAR device includes at least one first holographic optical element which allows electromagnetic radiation emitted in a first predetermined wavelength range to pass undiffracted,
wherein the first holographic optical element is configured to deflect electromagnetic radiation emitted in a second predetermined wavelength range by a first angle of reflection, and
wherein the first angle of reflection and the second angle of reflection have opposite signs relative to a propagation direction of the electromagnetic radiation emitted in the second predetermined wavelength range.

2. A LIDAR device, comprising:
a beam source configured to emit electromagnetic radiation in an emission path, in which at least one holographic optical element is situated for diffracting the emitted electromagnetic radiation;
a detector configured to detect incident electromagnetic radiation in a reception path, an optical bandpass filter being connected upstream from the detector; and
a second holographic optical element configured to deflect electromagnetic radiation emitted in the second predetermined wavelength range by a second angle of reflection;
wherein, depending on a wavelength of the emitted electromagnetic radiation, the holographic optical element effectuates a diffraction by at least one angle of reflection which is matched to a shift of a wavelength of the incident electromagnetic radiation using the bandpass filter,
wherein the LIDAR device includes at least one first holographic optical element which allows electromagnetic radiation emitted in a first predetermined wavelength range to pass undiffracted,
wherein the first holographic optical element is configured to deflect electromagnetic radiation emitted in a second predetermined wavelength range by a first angle of reflection, and
wherein the LIDAR device includes a third holographic optical element which is configured to deflect electromagnetic radiation emitted in a third predetermined wavelength range by a third angle of reflection.

3. The LIDAR device as recited in claim 2 , wherein the first holographic optical element and/or the second holographic optical element and/or the third holographic optical element is a transmission-volume hologram.

4. The LIDAR device as recited in claim 1 , wherein the beam source is a broad area laser.

Assignees

• Bosch Gmbh Robert

Inventors

• Frederiksen Annette
• Spiessberger Stefan
• Hartmann Stefanie

Classifications

• G01S7/4814 Primary

  of transmitters alone · CPC title

• G01S7/481 Primary

  Constructional features, e.g. arrangements of optical elements · CPC title

• G01S7/4816

  of receivers alone · CPC title

• G01S7/4868

  Controlling received signal intensity or exposure of sensor · CPC title