  Recent progresses of electronics, essentially due to its miniaturization, are
opening new fields that were just dreamed of, notably in astronomy. At start in
paragraph 3, we introduce the time variation of images expressing the dual
nature of the optical signal (ZO) and we expose several useful applications
where the optical signal variations are not faster than CCD. However we
prefered to initiate the article with a deeper question posed inadvertently in
paragraph 2: what causes the rapid, well timed and regular variation of the
signals induced in our test setup, which we see in Fig. 1. The answer proposed
are two causes: one is a light photon acting indirectly through the induction
of a large number of secondary electrons (paragraph 2), the other are the RF
photons (subliminal, but acting directly) as detailed in paragraph 4. For both
light and RF, using a sum of induced currents instead of a single photon
quadri-vector transform the case.

Instrumentation and Methods for Astrophysics