  We study the possibility of detecting the background of Supernova Relic
Neutrinos (SRN) with liquid Argon Time Projection Chamber (TPC) detectors. As
far as this study is concerned, these experimental devices are mainly sensitive
to electron neutrino signals, and could provide further information on both
Supernova explosion mechanism and on star formation rate at redshifts z <2. We
study in details the main contributions to background in the relevant energy
range from 8B and hep solar neutrinos as well as from low energy atmospheric
neutrino fluxes. Depending on the theoretical prediction for the SRN flux we
find that for a 3 kton and a 100 kton liquid Argon TPC detectors the signal may
be observed at the 1 sigma and 4 sigma level, respectively, with 5 years of
data taking.
