  Wireless Sensor Network (WSN) is pertinent to many applications with varied
network parameters. Sensor node placement in the application region whether it
is indoor or outdoor is a major task as well as plays very remarkable role in
the network performance. Node placement is carried out according to the region
where it is applied, either deterministic or non deterministic. Because of the
need for different sensing probability or detection probability, same approach
of sensor placement may not be suited for all the applications. Some of the
applications are well formed and give better performance with the uniform
distribution of sensors but few need intense distribution of nodes in
particular sensitive places especially those applications meant for intrusion
detection. An application which needs high level intrusion detection and a
suitable sensor distribution methodology, known as Half-Normal Distribution
(Half-Gaussian) based deployment, have been set forth in this paper. We have
also discussed the theoretical comparison for detection probability with the
uniform distribution in terms of number of sensor nodes.
