US 11,892,368 B2
Condition monitoring apparatus
Klaus Meck, Slough (GB); and Sebastian Sztendel, Slough (GB)
Assigned to JOHN CRANE UK LIMITED, Slough (GB)
Appl. No. 17/802,414
Filed by John Crane UK Limited, Slough (GB)
PCT Filed Feb. 24, 2021, PCT No. PCT/GB2021/050454
§ 371(c)(1), (2) Date Aug. 25, 2022,
PCT Pub. No. WO2021/170998, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 2002610 (GB), filed on Feb. 25, 2020.
Prior Publication US 2023/0082945 A1, Mar. 16, 2023
Int. Cl. G01M 13/005 (2019.01); F16J 15/34 (2006.01)
CPC G01M 13/005 (2013.01) [F16J 15/3492 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A condition monitoring apparatus for a system comprising rotating or reciprocating machinery and a seal, the apparatus comprising:
a first acoustic sensor coupled to the seal for providing a first acoustic emission signal;
a second acoustic sensor coupled to the rotating or reciprocating machinery for providing a second acoustic emission signal; and
a filter module, wherein the filter module is configured to perform active noise cancellation based on a comparison of the first acoustic emission signal and the second acoustic emission signal.