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This is the second paper on a new formalism for relativistic quantummeasurements. Here, we construct a fully relativistic model for detectors thattakes into account the detector's state of motion, intrinsics dynamics, initialstates and couplings to the measured field. The dual classical/quantumdescription of the detector is implemented by using a master-equation type ofapproximation for the coarse-grained pointer variables. Then we identify theprobabilities that correspond to ideal measurements, i.e., measurements thatare largely insensitive to modeling details of the apparatus. The Unruh-Dewittand Glauber detectors are recovered at the appropriate limits. We employ ourresults to models of particle detection, photodetection and relativistic spinmeasurements, and we derive an ideal distribution for relativistictime-of-arrival probabilities.

Measurements on relativistic quantum fields: II. Detector models