  In this paper we propose a domain sampling type reconstruction scheme for an
inverse boundary value problem to identify an unknown cavity by single
measurement on the accessible boundary of a known electric or heat conductive
medium. Here the single measurement is to give single current or heat flux
which can have a small support over the boundary, and we measure the
corresponding voltage or temperature over the whole boundary. For this inverse
boundary value problem, we adapted the single NRT (no response test) introduced
by Luke and Potthast for inverse scattering problem and show that it can
provide such a domain sampling type reconstruction scheme.
