Faraday cup: Faraday cup consists of a metallic cup that is connected to the earth through a resistor. An incoming ion strikes the cup and gets neutralized. This results in an electric current through the resistor that is proportional to the ion abundance.
Daly detector: A Daly detector is a type of electro-optical ion detector. The detector has one or more conversion dynodes that generate electrons in response to the ion strike. These electrons are accelerated towards a phosphor screen (scintillator) that generates photons in response to the electron strike. The photons, thus generated are detected by a photomultiplier tube (Figure 12.9).
Figure 12.9 Schematic diagram showing working principle of a Daly detector
Focal-plane detectors: All the above-mentioned detectors fall in the category of point ion detectors i.e. the ions with different 
are resolved in time and detected at a single point. Focal-plane detectors detect the ions simultaneously; the ions of different are resolved in space, therefore strike at different points in array detectors (Figure 12.10).
Figure 12.10 Schematic diagram showing a focal-plane detector for a magnetic sector mass analyzer