The Importance Of Sensors

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A sensor is a device that receives a stimulus, meaurand, or any input signal such as from heat, pressure, light, motion and many more, and responds with an electrical signal. This electrical signal then will decide what will be the result of an output. Depending on the input of the stimulus, the sensor will react to it in a particular way. Sensors are attached to an electrical device and they scan the surrounding environment. Then it converts the input signals to a voltage, current or charge. This information will be gathered by a system connected together using wired, optical or wireless instruments. Based of the information gathered the system will output an electrical output to a transducer. A Transducer will then convert the electrical …show more content…
Background
In the world we live, we are surrounded by sensors without us acknowledging of how many sensors we use in a daily basis. At our home, work , cars and even us, human beings have “sensors”. We as humans say the top five senses are sight, hearing, touch, smell, and taste. These senses have sensory organ: eyes, nose, ears, tongue, and skin. According the article, How the Human Body Receives Sensory Information , “ these organs receive raw stimuli and translate them into signals the nervous system can use. Nerves relay the signals to the brain, which interprets them as sight (vision), sound (hearing), smell (olfaction), taste (gustation), and touch (tactile perception) senses perceive stimuli from the outside world or inside our body and we react
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Sensor classification ranges from very simple to really complex types. They are categorized in two types, invasive and noninvasive sensors. Invasive sensors usually are electrical or mechanical and are located within the environment of interest. In the other hand, the Noninvasive sensors( or Remote sensors are located outside the environment and are controlled remotely. (Ravi,2017). According to handbook of Modern Sensors by jacob Fraden, the types of sensor are determined by the physical variable they sense and are categorized in;

Electrical: current, voltage, resistance, capacitance, inductance, and charge; Chemical: chemical concentration, composition, and reaction rate; Magnetic: magnetic field intensity, flux density, and magnetization; Mechanical: displacement or strain, level position, velocity acceleration, torque, pressure and flow rate; Radiant: electromagnetic wave intensity, wavelength, polarization, and phase; Thermal: temperature, heat, and heat

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