Such an innovation could result in detectors that are, in some cases, millions of times more sensitive than current ... of visible light and other forms of electromagnetic radiation.

The working principle of this cheap and easy to build metal detector circuit consists in mixing two equal frequencies which causes a low-frequency interference ... is amplified. If the sensor coil L1 ...

A single-photon detector (SPD) is sensitive to incidence of individual ... referred to as ultra-narrowband interference circuit (UNIC), and realized exceptional performance for narrow-band ...

Such an innovation could result in detectors that are, in some cases, millions of times more sensitive than current technology ... the normal behavior of visible light and other forms of ...