High speed hot air leak sensor

Details High speed hot air leak sensor High speed hot air leak sensor

1985-10-30

1987-04-07

Frankfort, Charles

Thermal measuring and testing

Leak or flaw detection

374121, 374135, 250342, G01K 116, G01N 2572

Patent

active

046556079

ABSTRACT:
A hot air leak sensor for sensing jet engine bleed air leaks in an aircraft. Infrared detectors are combined with thermal re-radiating elements which are installed in air passages adjacent to the bleed air ducts and downstream of the region where a bleed air leak may occur. The elements are approximately 50% transmissive and 50% absorptive to infrared radiation with wavelengths within the range of approximately 4 to 20 micrometers. Incident radiation within the field of view of the detector is both transmitted and absorbed for re-radiation to the detector. If no incident radiation within the sensor field of view is available, the re-radiating element still responds to the increased airstream temperature resulting from the bleed air leak and supplies radiation to the detector to provide detection of the leak.

REFERENCES:
patent: 2866064 (1958-12-01), Kenkel
patent: 3405271 (1968-10-01), Stevens et al.
patent: 3861458 (1975-01-01), Ostrander et al.
patent: 4058734 (1977-11-01), Vroombout
patent: 4285466 (1981-08-01), Linscheid et al.
patent: 4293768 (1981-10-01), Adachi et al.
patent: 4437002 (1984-03-01), Taniguchi et al.

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