Quantum Diamond Technologies

I don’t understand what Quantum Diamond Technologies is… hopefully I will by the end of this post. Their patents say:

“An example of a sensor technology that is dependent on proximity to the sample is wide-field magnetic imaging with nitrogen-vacancy (NV) centers in diamond. NV centers exhibit magnetic resonance behavior that depends sensitively on the vector magnetic field and which may be read out optically using light emitted from the NV centers and collected in the far field with imaging optics. This technology may be used to construct high-resolution maps of the vector magnetic field across a wide field of view on the diamond surface…

…NV centers result from the substitution of two adjacent carbon atoms in the diamond lattice with a nitrogen atom and an empty site (a vacancy).

NV magnetic sensing may be performed by observing spin-dependent fluorescence from NV sensors. When excited with green light from the ground electronic state, NV centers emit red fluorescence.”

Pretty incomprehensible to me at first glance, but unpacking it: