Berührungsloser Flugzeitkraftstofffüllstandssensor mit Optischer Kunststofffaser

Details

Veröffentlichungs-Nr.

EP3722757

Aktenzeichen

EP20155558

Anmeldetag

5. Februar 2020

Veröffentlichung

10. Mai 2023

Erteilung

10. Mai 2023

Rechtsraum

EP

IPC

G01F23/292G01F23/00G01S7/481G01F23/80// F21V8/00G01S17/88G01S7/4865

Abstract

A fuel sensing system (50) utilizes non-contact plastic optical fiber (POF) (14) to optically sense a level of liquid fuel (2) in a fuel tank (10). In one implementation, the fuel level sensing system (50) includes the following elements: (i) a high-speed and high-power red laser diode (28); (ii) an ultra-high-sensitivity photon-counting avalanche photodiode (32); and (iii) a large-diameter and large-numerical-aperture graded-index POF (14). The fuel level is sensed when the avalanche photodiode (32) first detects impinging light reflected by the POF end face (1) and then detects impinging light reflected by the fuel surface (3) in response to emission of a laser pulse (18) by the red laser diode (28). A time delay detection circuit (30) calculates the time interval separating the respective times of arrival. A fuel level calculator (34) calculates the fuel level based on the time interval provided by the time delay detection circuit (30).

Anmelder

Firma

The Boeing Company

Land

🇺🇸 USA

Fachgebiete