Technically, the Allied fuze used constructive and destructive interference to detect its target.

A photon sieve is a device for focusing light using diffraction and interference.

By using interference rather than absorption of light, extremely transparent samples, such as live mammalian cells, can be imaged without having to use staining techniques.

Rather than using constructive and destructive interference, horns achieve directionality by reflecting sound into a specified coverage pattern.

But rather than search cells and confiscate phones, they have shut down communications towers around prisons, or have used electronic interference.

The Fabry-Pérot interferometer uses interference between multiple reflections.

This was the first method used widely for the fabrication of fiber Bragg gratings and uses two-beam interference.

The coronagraph, using interference, masks out the light along the center axis of the telescope, but allows the light from off axis objects through.

Though the Allied nations, using external interference, provided substantial military aid to the loosely knit anti-Bolshevik forces, they were ultimately defeated.

Noise canceling headphones use destructive interference to cut out noise from the outside.