Figure 3
From: NQR sensitive embedded signatures for authenticating additively manufactured objects
(a) Spatially-selective detection using an array of hollow solenoid coils. The system measures signatures from N groups of tags near-simultaneously by using a 1 : N analog multiplexer. (b) Signatures from M tags within each group can be measured per scan using relaxation-based imaging. Thus, a total of \(N\times M\) tags can be measured by combining the two techniques. (c) A normal SLSE pulse sequence for signature read-out which requires a wait-time of \(T_w\). (d) A multiplexed SLSE pulse sequence that allows signature from other tags to be acquired during \(T_w\) [Microsoft Visio].
