In the second part, we study the influence of inhomogeneity in the resource, considering two measurement points.
The stationary method needs two measurement points upstream and downstream the leak, the dynamic method only one measurement point if applied to a circular air flow system.
The study relied on a quasi-experimental two-group design with two measurement points (pre- and post-test) and applied a multiple-choice questionnaire as assessment instrument.
A total of 190 undergraduate students from an Australian university were administered two online questionnaires over two measurement points with 1-week interval.
For two measurement points of the same distance, the decay factor of the coherence function varies along the bridge main beam as well as the bridge towers depending on their positions.
Results show that based on only two measurement points, the proposed method can accurately obtain inverse results that agree well with exact solutions even if measurement noise is involved.
There is a clear difference between the recorded values of P2 at two measurement points, which indicates that there is a pressure gradient induced by small size vent conditions due to the change of flow cross-section.
Typically, two measurement points are deployed in gradient-field sensing.
The proportion of identical answers at two measurement points.
The distance of the two measurement points is 50 m.
The curves present the cumulative distribution (in percent) of the two measurement points.
