The dimensions of the treated crane rail are relatively small. In practice crane rails of much larger dimensions are encountered. The required measurement precisions are adequately higher. The proposed approach can therefore obviously be performed only if we can use a total station of the highest precision possible.2.2. Signalization of Detail Points����L�� Platform with PrismsA special platform (Figure 1) is used for the signalization of detail points. It consists of a holder and two precise prisms force-centered on it. The holder is made of an L-shaped 2 cm thick iron profile. It is 6.5 cm wide and its arms are 7 and 14 cm long. Adapters for precise prisms are attached at both outer surfaces. At the edge a circular level is fixed to the holder to ensure the horizontality of the platform.Figure 1.
��L�� platform for point signalization and its constants.The position of the characteristical point, representing the upper inner edge of the rail, can be derived from the measured positions of both precise prisms. Accurate dimensions of the platform need to be known, i.e., offset of both prisms from the edge of the rail.2.2.1. Calibration of the ��L�� Platform and Characteristic Point DeterminationEach setting of the platform onto a crane rail provides us with two prism center points. We want to represent each setting with one characteristical point. The position of a characteristic point is shown in Figure 1. The centers of measuring prisms are uniquely determinable. The centers of the prisms and the characteristic point lie in the common vertical plane.
The coordinate system is defined in such a way that it allows the computation of the characteristic point using the upper prism:[xKT1yKT1zKT1]=[x1?dx1y1z1?dz1](5)or using the side prism:[xKT2yKT2zKT2]=[x2?dx2y2z2?dz2].(6)Indexes 1 and 2 will hereafter represent the upper (5) and the side (6) prism, respectively. Two computation modes provide us the control and accuracy evaluation of the characteristical point. For such computation parameters, dx1, Anacetrapib dz1, dx2, dz2 defining the geometry of the
As one of the most promising strain and temperature sensors, the fiber Bragg grating (FBG) has attracted considerable attention due to its novel properties such as small size, fiber compatibility, immunity to electromagnetic interference, and multipoint sensing capability [1,2].
To implement a multiple FBG sensor network, various methods such as wavelength division multiple access (WDMA), time division multiple selleck chemicals Tofacitinib access (TDMA), and code division multiple access (CDMA) have been reported. The primary advantage of using an FBG as a sensor is that a large number of sensors can be integrated along a single fiber [3]. In the WDMA system, the maximum number of sensors is determined by the usable spectral bandwidth of the system and the wavelength shift of each sensor [4].