For this reason, both standard deviations given by a plane and by a curved surface are separately reported in the results.Finally, the resolution has been estimated differently along the optical axis of each range device (z) and along the other two directions (xy). These two resolution parameters will be indicated hereafter as z resolution and horizontal resolution respectively. One key point of the proposed approach for resolution estimation consists in representing the range images associated with each 3D device as grey level images on which the analyses previously developed for the 2D imaging area can be applied. For example, if a black to white transition has to be replicated, the corresponding 3D target will be characterized by an abrupt jump of its 3D surface along the z direction, and the range device will be oriented in order to have
Among piezoelectric materials, Lead Lanthanum Zirconate Titanate (PLZT) is one of the most popular.

PLZT is a ferroelectric solid solution with wide-ranging material properties that depend on its composition [1]. Recently, a new PLZT bulk single plate, called selleck chem ceramic-controlled piezoelectric (CCP) has been produced; this CCP has a 300 ��m Pt-wire implant in order to form a free upper face that measures optic and mechanic events [2]. This structure design includes a modified electrode configuration: a Pt-wire introduced into a bulk PLZT. The Pt-wire was chosen as an implant because it possesses high resistance to chemical attack, it has excellent high-temperature characteristics (melting point 1,768.

3 ��C), and it has stable electrical properties and thermal conductivity with small variations [3]. When CCP is polarized, the mobile charges in the Pt-wire accumulate on its surface until the field produced completely cancels the external field applied to the conductor; this results in electrical equilibrium within the Pt-wire so the internal the electrical field is zero, as shown in Figure 1. This means that the net charge is distributed over a section of the surface, which has a thickness of several atomic layers, but not in the geometrical sense [4]. The sample preparation is described in the following sections [2].Figure 1.Electric field waves across Pt-wire (top view).The Pt-wire cylinder dimensions are 10 mm high and 0.3 mm diameter; this gives a surface area of 9.42 mm2. The surface area of one of the faces of the ceramic is 78.53 mm2, making the surface area of the ceramic 8.33 times bigger than that of the Pt-wire.Pt-wire implanted into bulk PLZT ceramic behaves singularly in the CCP due to the domains coating the Pt-wire, as shown in Figure 2.