Zeitmultiplex von Optischen Lidar-Luftdatenkanälen

Details

Veröffentlichungs-Nr.

EP4506722

Aktenzeichen

EP24188568

Anmeldetag

15. Juli 2024

Veröffentlichung

12. Februar 2025

Rechtsraum

EP

IPC

G01S7/481G01S17/933G01S17/95G01S7/497

Abstract

Various embodiments describe time-multiplexing of optical channels in an air data sensor (200) which may be a lidar sensor affixed to a vehicle such as an aircraft. At least one switch (106) outputs a reference optical signal, and each of a plurality of backscattered optical signals to at least one common optical path at a time. In time-multiplexing the reference signal on the same optical channel as used to transport the backscattered signal, the extent of systematic bias present in the at least one common optical path can be compensated for and even reduced during sensor operation of determining environmental parameters. A laser source (102) is coupled to an optical head (104) and at least one optical switch (106), for example, via one or more optical fibers. Optical head (104) includes guided optics and directs the reference signal to a different optical port of optical head (104). System (200) includes an interferometer (107) comprising a ferrule (108) coupled to a detector (110). Ferrule (108) includes at least one optical channel that receives the reference and backscattered signals. The configuration of switch (106) is set by timing circuitry (114). In an embodiment, ferrule (108) includes four optical channels: channel R (reference signal) and channels 1 to 3 (first to third backscattered signals, respectively). The disparity between the reference signal in each of channels 1, 2, and 3 can be compared with the reference signal from channel R to determine the extent of systematic bias for a given optical channel.

Anmelder

Firma

Honeywell International Inc.

Land

🇺🇸 USA

Fachgebiete