  The four Rindler quadrants of a pair of oppositely accelerated frames are
identified as a (Lorentzian) Mach-Zehnder interferometer. The Rindler frequency
dependence of the interference process is expressed by means of a (Lorentzian)
differential cross section. The Rindler frequencies of the waves in the two
acccelerated frames can be measured directly by means of a simple inertially
moving detector.
