Optical fibre sensor detection device for oxygen content of fuel tank

Abstract

The invention discloses an optical fibre sensor detection device for the oxygen content of a fuel tank. The optical fibre sensor detection device comprises an excitation light source, a Y-shaped optical fibre, an optical fibre sensing probe, a detection cell and a detector; an incidence end of the Y-shaped optical fibre is coupled with the excitation light source; a receiving end of the Y-shaped optical fibre is connected with the detector; one end of the optical fibre sensing probe is connected with the Y-shaped optical fibre; the other end of the optical fibre sensing probe is positioned in the detection cell, wherein the detection device also comprises a sample gas pre-treatment unit which can filter oil droplets and hydrocarbons; one end of the sample gas pre-treatment unit is communicated with the detection cell; the other end of the sample gas pre-treatment unit is communicated with the fuel tank. The optical fibre sensor detection device for the oxygen content of the fuel tank is intrinsically safe, can treat a gas which contains the oil droplets and the hydrocarbons in the fuel tank, cannot pollute the sensing probe, and is suitable for measuring the oxygen content under complicated environmental conditions in the fuel tank in real time.

Description

Technical field: [0001] The invention relates to a device for detecting the oxygen content of a fuel tank, in particular to an optical fiber sensor detection device for the oxygen content of the fuel tank. Background technique: [0002] Aircraft safety issues have been widely concerned, and once an aircraft accident occurs, it will cause heavy loss of life and property. Fuel tank explosions account for a high percentage of all catastrophic accidents in aircraft. NATO military and civilian aircraft accident investigations show that among the 1141 fire-related accidents, the main reason is that the fuel tank exploded after flying or crashing. Preventing accidents caused by fuel tank explosions is of great significance for improving the safety of civil aircraft and the battlefield survivability of military aircraft. [0003] The upper part of the aircraft fuel tank is easy to form a mixture of fuel and air. When the mixture of fuel and air reaches a certain concentration, due...

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Problems solved by technology

[0006] After adopting the above structure, compared with the prior art, the advantage of a fuel tank oxygen sensor detection device of the present invention is: for the complex measurement environment of oxygen content in the aircraft fuel tank, the optical fiber oxygen sensor detection device designed by the present invention is The sensing part has been optimally designed, and a sample gas pretreatment unit is connected to the detection cell, which can filter oil droplets and hydrocarbon gases in the fuel tank, thereby ensuring the performance of the present invention. When the safety is confirmed, it can prevent the sensor probe from being polluted and affect the measurement results, so that the present invention can better measure the oxygen content online in real time under complex environmental conditions in the fuel tank

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