Who Invented the Non Linear Junction Detector?

This paper presents an historical retrospective on the development of the nonlinear junction detector (NLJD), a device that can be used to remotely detect (hidden) objects based on their nonlinear electric behavior. After presenting the principle of the device and its architecture, the development of the nonlinear junction detector is highlighted in chronological order, and C. Bovill is acknowledged for this technological milestone. The work done in this article can be used by researchers working in the field of harmonic and intermodulation transponders and radars.