Lidar measuring method and device with sub-pulses produced by birefringence in the laser resonator
Assigneeams-OSRAM International GmbH
InventorJens EBBECKE
Life of this patent
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Abstract
A measurement method includes emitting a transmission signal comprising at least one light pulse, wherein an amplitude of an intensity of the light pulse is modulated with a modulation frequency, detecting a receiving signal comprising at least a part of the transmission signal that is reflected from an external object, selecting at least one frequency component of the receiving signal corresponding to the modulation frequency of the transmission signal, and determining a distance to the external object from a time difference between the emission of the transmission signal and the detection of the selected frequency component of the receiving signal.
Claims13
A measurement method comprising:
- emitting a transmission signal comprising at least one light pulse, wherein an amplitude of an intensity of the light pulse is modulated with a modulation frequency and the modulation frequency is between 500 MHz and 10 GHz, inclusive,
- detecting a receiving signal comprising at least a part of the transmission signal that is reflected from an external object,
- selecting at least one frequency component of the receiving signal corresponding to the modulation frequency of the transmission signal,
- determining a distance to the external object from a time difference between the emission of the transmission signal and the detection of the selected frequency component of the receiving signal,
- wherein one light pulse of the transmission signal is generated by a superposition of two unmodulated sub-pulses with light of different frequency, and
- wherein the modulation frequency corresponds to a frequency difference of the light of the two sub-pulses.
(canceled)
A measurement device, comprising:
- a transmission unit configured to emit a transmission signal during operation, the transmission signal comprising at least one light pulse in which an amplitude of an intensity is modulated with a modulation frequency,
- a receiving unit configured to detect a receiving signal during operation, the receiving signal comprising at least a part of the transmission signal reflected from an external object, and
- an evaluation unit configured to analyze the receiving signal during operation, and that is configured to select at least one frequency component of the receiving signal at the modulation frequency and to determine at least a distance to the external object from a time-of-flight of the transmission signal determined therefrom, wherein
- at least one light pulse comprises laser light, and
- the transmission unit comprises a resonator in which a laser medium and a birefringent optical element are arranged.
Dependencies are inferred from the claim text.