US 11,860,124 B2
Oil debris monitor to detect mechanical failures in high noise environments
Edward Thomas Rocco, Rocky Hill, CT (US); and Danbing Seto, Avon, CT (US)
Assigned to RTX Corporation, Farmington, CT (US)
Filed by RTX Corporation, Farmington, CT (US)
Filed on Feb. 7, 2022, as Appl. No. 17/666,009.
Application 17/666,009 is a continuation of application No. 16/385,157, filed on Apr. 16, 2019, granted, now 11,268,932.
Prior Publication US 2022/0155257 A1, May 19, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G01N 27/74 (2006.01); G01N 33/28 (2006.01); G01N 27/02 (2006.01)
CPC G01N 27/74 (2013.01) [G01N 33/2888 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for determining a detection threshold used for determining the presence of a particle in a system, comprising:
a) collecting channel data from a sensor;
b) calculating a detection threshold based on a measure of background noise in the system;
c) processing the channel data to identify a ferrous and nonferrous signal;
d) processing the ferrous and nonferrous signals to determine signal peaks above the detection threshold;
e) adjusting the detection threshold if more signal peaks are observed than allowable particles in a given time window; and
f) transmitting the detection threshold determined in step e); and further comprising
receiving the detection threshold, and monitoring the sensor by:
identifying a rate limit as a function of the detection threshold;
calculating a rate limit influence factor;
summing a discrete rate limit influence continuously over a window to calculate the rate limit;
transmitting the calculated rate limit to a particle release rate comparison algorithm; and
generating an alert if the calculated rate limit is below an acceptable limit.