Method and device for measuring the concentration of extinguishing agent in a fire zone

A device for measuring, on an aircraft, the extinguishing agent concentration of a gaseous mixture, comprising:

• an ultraviolet radiation detector which generates an output signal that is a function of the concentration of said agent in said gaseous mixture and an electronic circuit for determining said concentration as a function of said output signal,
• a unit for sampling said gaseous mixture in at least one fire zone of said aircraft, and
• a measurement chamber passed through by said gaseous mixture and comprising a tranquilizing chamber, said detector being arranged in such a way as to measure the concentration of said agent in said gaseous mixture passing through said tranquilizing chamber.

A method for measuring, on an aircraft, the concentration of an extinguishing agent by means of an ultraviolet radiation detector, comprising the steps:

• continuously sampling a gaseous mixture in a fire zone of an aircraft,
• conducting said sampled gaseous mixture into a tranquilizing chamber, and
• measuring in real time, in said tranquilizing chamber, the concentration of extinguishing agent in said continuous sampling of gaseous mixture by means of said ultraviolet radiation detector.