Computer Networks and InformationTechnologies
Tahun : 2011Pengarang : Vinu V Das
Penerbit : Springer
Ket : An instrumentation system consists of sensor as input, signal conditioning module as interfacing device and indicator or display unit as output device. The signal conditioning unit, which include amplifiers and filters circuit module etc, takes the input signal(s) obtained through transducer and conditioned it to a standard format in terms of voltage or current i.e. 0-5V/0-10V or i.e. 0-20mA/4-20mA respectively [1,3,4]. The uniform light intensity falling on the cell delivers varying output current across the load. Its relatively large power output, small physical size, and its quick response to change in light intensity are some of the unique features of this device. It can be used to sense and measure physical movements of objects that may be small in magnitude or occur too fast for visual observations [2]. It can be used in locations that are inaccessible to other sensors. Thus the constrained faced in conventional transducers like LVDT etc are overcome with this transducer. Typical dimension of a solar cell used as a transducer is shown in Fig.1 as 28mm x 8mm x 2mm. The advantages of its small size senses very small changes in light intensity caused by either due to small mechanical movement of object that cast a shadow on the cell or movement of light causing variation in light intensity.
Ketegori : COMPUTER NETWORK
