"EMF (electromagnetic field) measurements
are made on ambient (surrounding) electromagnetic fields that are performed using
particular sensors or probes, such as EMF meters. These probes can be generally
considered as antennas although with different characteristics. Probes should not
perturb the electromagnetic field and must prevent coupling and reflection as much
as possible in order to obtain precise results. There are two main types of EMF
measurements: broadband measurements performed using a broadband probe which senses
any signal across a wide range of frequencies and is usually made with three independent
diode detectors, and also frequency selective measurements in which the measurement
system consists of a field antenna and a receiver or spectrum analyzer allowing
to monitor the frequency range of interest." -
Wikipedia
"A particle detector, also known as a radiation detector, is a device used to
detect, track, and/or identify ionizing particles, such as those produced by nuclear
decay, cosmic radiation, or reactions in a particle accelerator. Detectors can measure
the particle energy and other attributes such as momentum, spin, charge, particle
type, in addition to merely registering the presence of the particle."
Wikipedia
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