Method and apparatus for reducing crosstalk in a structural health monitoring system
First Claim
1. A method of facilitating structural health monitoring according to stress waves transmitted from an actuator to a sensor through the structure, comprising:
- initiating the transmission of first and second actuation signals to the actuator so as to facilitate the generation of first and second stress waves within the structure;
receiving first and second sensor signals from the sensor, the sensor signals each having a crosstalk portion corresponding to an electromagnetic interference from the respective actuation signal, and a stress wave portion corresponding to the respective stress wave, wherein the crosstalk portion of each sensor signal overlaps the stress wave portion of that sensor signal; and
combining the first and second sensor signals so as to isolate the stress wave portions from the crosstalk portions.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and apparatus for reducing crosstalk in a structural health monitoring system. A pair of actuator input signals are sent to an actuator, each resulting in the transmission of stress waves to a corresponding sensor. The sensor then converts these stress waves to a pair of output signals, each having a crosstalk portion due to electromagnetic interference from the input signals to the actuator, and a stress wave portion corresponding to the stress waves. Various methods of varying the actuator input signals, the input to the actuator, and the output of the sensor result in two output signals that can be combined so as to reduce the crosstalk portions and isolate the stress wave portions. This allows actuators and sensors to be placed sufficiently close together that the stress wave portions of sensor output signals can overlap their crosstalk, without corrupting or otherwise compromising the data contained therein.
-
Citations
16 Claims
-
1. A method of facilitating structural health monitoring according to stress waves transmitted from an actuator to a sensor through the structure, comprising:
-
initiating the transmission of first and second actuation signals to the actuator so as to facilitate the generation of first and second stress waves within the structure; receiving first and second sensor signals from the sensor, the sensor signals each having a crosstalk portion corresponding to an electromagnetic interference from the respective actuation signal, and a stress wave portion corresponding to the respective stress wave, wherein the crosstalk portion of each sensor signal overlaps the stress wave portion of that sensor signal; and combining the first and second sensor signals so as to isolate the stress wave portions from the crosstalk portions. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A computer readable medium encoded with computer executable instructions thereon for a method of monitoring the health of a structure according to stress waves transmitted from an actuator to a sensor through the structure, the method comprising:
-
initiating the transmission of first and second actuation signals to the actuator so as to facilitate the generation of first and second stress waves within the structure; receiving first and second sensor signals from the sensor, the sensor signals each having a crosstalk portion corresponding to an electromagnetic interference from the respective actuation signal, and a stress wave portion corresponding to the respective stress wave, wherein the crosstalk portion of each sensor signal overlaps the stress wave portion of that sensor signal; and combining the first and second sensor signals so as to isolate the stress wave portions from the crosstalk portions. - View Dependent Claims (7, 8, 9, 10)
-
-
11. A system for facilitating structural health monitoring, comprising:
-
an actuator configured to generate a stress wave from an actuation signal; a sensor configured to receive the stress wave and to generate a sensor signal having a first portion corresponding to an electromagnetic interference from the actuation signal, and a second portion corresponding to the stress wave; and
a processor in communication with the actuator and the sensor;wherein the actuator and the sensor are configured for placement upon a structure at a distance apart from each other, the distance corresponding to the second portion of the sensor signal overlapping the first portion; and wherein the processor is configured to isolate the second portion of the sensor signal from the overlapping first portion. - View Dependent Claims (12, 13, 14, 15, 16)
-
Specification