Design of differential resistive measuring system and its applications

Differential resistive systems are easily designed using potentiometric sensors. They usually contain two sensing resistances and a common movable terminal. This circuit can be used to sense a number of scenario; such as the liquid level in a tank, biomedical applications in determining the expansion and contraction of the muscles, the amount of bend in a bimetallic strip, the expansion and contraction in roads and railways, cracks in building for civil application, the penetration of signal in buildings for telecommunication and communication engineering applications, the voltage level in complex circuit. Since sensors with high sensitivity and good resolution are required for industrial applications, hence the need for this cheap and affordable sensor's design. Also, their output must have linear responses, that is, the output produced should be linearly proportional to the parameters of interest [1]. This chapter deals with the design of a differential resistive measuring sensor with low cost, low power consumption, with small size and improved overall performance of the circuit implanted in human body in order to generate voltage, current whose frequency, duty cycle is proportional to the physical parameters of interes

Identification of Linearized Regions of Non-Linear Transducers Responses

Transducers have found wide applications in industries, though, they possess nonlinear responses. The nonlinearity feature does not prevail over the entire range; rather there are sections (or regions) on the response curves that are easily regarded as linear. This work focuses on analyzing transducer characteristics by finding regions exhibiting larger level of linearity.The point of inflection is a joint between two consecutive linear segments, and it is where changes in the output signal in response to external parameter variations remain at minimum compared to its immediate neighboring points. It is shown through simulations on how, assuming that a given system does not operate over the entire range of the response curve, a linear response is assured. This is done by translating the circuit operating over the linear section by employing additional external circuit elements. This paper attempts at analyzing a transducer characteristics by showing regions around the points of inflections where variations remain most linear