  We have shown the classical correspondence of Unruh effect in the classical
relativistic electron theory in our previous work (gr-qc/0105051). Here we
demonstrate the analogy between the classical relativistic electron theory and
the classical Unruh-DeWitt type monopole detector theory. The field
configuration generated by a uniformly accelerated detector is worked out. The
classical correspondence of Unruh effect for scalar fields is shown by
calculating the modified energy density for the scalar field around the
detector. We conclude that a classical monopole detector cannot find any
evidence about its acceleration unless it has a finite size.
