A Low Cost Resistive Sensor Interface Circuit and its Noise Model
Keywords:
Resistive Sensor, Voltage Divider Network, Wheatstone Bridge Network, NoiseAbstract
Resistive based measurement principles and their applications in sensing technologies are widely used in industry and home automation. Resistive sensors apply a broad range of theories and phenomena from the fields of physics, material science, biology, electrochemistry, and electronics. Resistive sensors are the most commonly electronic component, module or subsystem whose purpose is to detect events or changes in their environment and send the information to other processing devices. In this paper, measurement of voltage from the sensing element through a resistive network is shown and different types of noise introduced in the circuit is also explained. Resistive sensors are the sensing elements which detect the changes in their resistance accordingly. The measurement of the physical quantity is quite difficult in current mode technique. Therefore the voltage mode conversion technique is being adopted to measure the physical quantities into variable resistance which is easily measured by the meters. The process of variation in resistance is widely used in the industrial applications. The resistive transducer can work both as the primary as well as the secondary transducer. The primary transducer changes the physical quantities into a mechanical signal, and secondary transducer directly transforms it into an electrical signal. Their applications span homeland security, industry, environment, space, traffic control, home automation, aviation, and medicine. Modern sensors are direct or indirect applications of the resistive sensing principles.
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