  We study one-dimensional Dirac fermions in the presence of a
spatially-varying Dirac velocity $v(x)$, that can form an approximate lab-based
Rindler Hamiltonian describing an observer accelerating in Minkowski spacetime.
A sudden switch from a spatially homogeneous velocity ($v(x)$ constant) to a
spatially-verying velocity ($v(x)$ inhomogeneous) leads to the phenomenon of
particle creation, i.e., an analog Unruh effect. We study the dependence of the
analog Unruh effect on the precise form of the velocity profile, finding that
while the ideal Unruh effect occurs for $v(x) \propto |x|$, a modified Unruh
effect still occurs for more realistic velocity profiles that are linear for
$|x|$ smaller than a length scale $\lambda$ and constant for $|x|\gg \lambda$
(such as $v(x)\propto \tanh \big(|x|/\lambda \big)$). We show that the
associated particle creation is localized to $|x|\ll \lambda$.
