Sensors and its types

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Information about Sensors and its types

Published on September 22, 2019

Author: NutronicsIndia


Sensors and its types: Sensors and its types By: Nutronics India 1 What are sensors?: What are sensors? A sensor is a device that detects and responds to some type of input from the physical environment. The specific input could be light, heat, motion, moisture, pressure, or any one of a great number of other environmental phenomena. The output is generally a signal that is converted to human-readable display at the sensor location or transmitted electronically over a network for reading or further processing.  2 Criteria to choose a Sensor: Criteria to choose a Sensor There are certain features which have to be considered when we choose a sensor. They are as given below : Accuracy Environmental condition – usually has limits for temperature/ humidity Range – Measurement limit of sensor Calibration – Essential for most of the measuring devices as the readings changes with time Resolution – Smallest increment detected by the sensor Cost Repeatability – The reading that varies is repeatedly measured under the same environment 3 Types of Sensors: Types of Sensors Temperature – Thermistors, thermocouples, RTD’s, IC and many more. Pressure – Fibre optic, vacuum, elastic liquid based manometers, LVDT, electronic. Flow – Electromagnetic, differential pressure, positional displacement, thermal mass, etc. Level Sensors – Differential pressure, ultrasonic radio frequency, radar, thermal displacement, etc. Proximity and displacement – LVDT, photoelectric, capacitive, magnetic, ultrasonic. Biosensors – Resonant mirror, electrochemical, surface Plasmon resonance, Light addressable potentio -metric. Image – Charge coupled devices, CMOS Gas and chemical – Semiconductor, Infrared, Conductance, Electrochemical. Acceleration – Gyroscopes, Accelerometers. Others – Moisture, humidity sensor, Speed sensor, mass, Tilt sensor, force, viscosity. 4 Sensors sold by Nutronics India: Sensors sold by Nutronics India Temperature Sensors This device collects information about temperature from a source and converts into a form that is understandable by other device or person. The best illustration of a temperature sensor is mercury in glass thermometer. The mercury in the glass expands and contracts depending on the alterations in temperature. The outside temperature is the source element for the temperature measurement. The position of the mercury is observed by the viewer to measure the temperature. 5 Slide6: 6 Slide7: Humidity Sensor A humidity sensor (or hygrometer) senses, measures and reports both moisture and air temperature. The ratio of moisture in the air to the highest amount of moisture at a particular air temperature is called relative humidity. Relative humidity becomes an important factor, when looking for comfort. 7 Slide8: pH Sensors pH sensor basically works on the fact that interface of two liquids produces a electric potential which can be measured. In other words when a liquid inside an enclosure made of glass is placed inside a solution other than that liquid, there exists an electrochemical potential between the two liquids. 8 Slide9: 9

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