Contact sensors Displacement , position and proximity sensor Non-contacting sensors The presence in the vicinity of the measured object cause change in air pressure or change in inductance or capacitance The movement of the sensor element’s is used to cause a change in electrical volatge, resistance, capacitance or mutual inductance The commonly • A sensor acquires a physical quantity and converts it into a signal suitable for processing (e.g. (PDF - 5.9MB) 3: Electronics (cont.) An instrumentation system obtains data about a physical system either for the purpose of collecting information about that physical system or for the feedback control of the physical system . Massachusetts Institute of Technology. Low pressure air is allowed to escape through port A. PDF | On Dec 6, 2017, G R Sinha published Introduction and Classification of Sensors | Find, read and cite all the research you need on ResearchGate We don't offer credit or certification for using OCW. Here, the output is usually an ‘electrical quantity’ and measurand is a ‘physical quantity, property or condition which is to be measured’. TUTORIAL 2 – SENSORS AND PRIMARY TRANSDUCERS This tutorialprovides an overview of instrument sensors used in process and automatic control. Sensors •1) Active sensors: Require an external source of power (excitation voltage) that provides the majority of the output power of the signal •2) Passive sensors: The output power is almost entirely provided by the measured signal without an excitation voltage Home This tutorial is mainly descriptive. Sensor manufacturers recognize these pin standards, so you don’t have to deal with all sorts of different communication protocols with interfacing with a sensor It is defined as an element which produces signal relating to the quantity being measured. Passive sensors are also known as self-generating sensors. Gate metal is replaced with an ion selective membrane. A sensor is a device that receives and responds to a signal. Gate metal is replaced with an ion selective membrane. – Sensor’s electrical properties • Amplifier, optoisolator e.g. Note:- These notes are according to the R09 Syllabus book of JNTU. •Active Transducer - one which requires external power. The full range of a sensor can be limited by compression or by clipping. 0000040662 00000 n Range & Span- a. Introduction to Sensors & Actuators Page 8 3. Thus you will be seeing a lot of BJTs when you work with sensor interfaces. In the absence of any obstacle / object, this low pressure air escapes and in doing so, reduces the pressure in the port B. 0000002833 00000 n Use OCW to guide your own life-long learning, or to teach others. Explore materials for this course in the pages linked along the left. Your use of the MIT OpenCourseWare site and materials is subject to our Creative Commons License and other terms of use. PDF | Remote sensing is the acquisition of information about an object without coming in physical contact of that object. Modify, remix, and reuse (just remember to cite OCW as the source. Typical Senso… Lecture notes files. This sensor is a very popular sensor used in many applications where measuring distance or … It comprises of three ports. Range The region between the limits within which an instrument is designed to operate for measuring, indicating or recording a physical quantity is called the range of (Note that clipping is an extreme example of compression!) section 3.2: temperature sensors 3.29 introduction 3.29 semiconductor temperature sensors 3.31 current out temperature sensors 3.33 current and voltage output temperature sensors 3.34 thermocouple principles and cold-junction compensation 3.38 auto-zero amplifier for thermocouple measurements 3.45 resistance temperature detectors (rtds) 3.47 However when an 29 Sensors, transducers and actuators Radiant Chemical Magnetic Mechanical Electrical Thermal a transducer converts a stimulus from a signal domain to another signal domain a sensor receives a stimulus and responds with an electrical signal direct sensor complex sensor Doubts please refer to the next stage than HC-SR04 Ultrasonic sensor - Working along the left 's no signup and. Energy to the actual value used in the pages linked along the left, such heat... As the source mm 10mm ˜/! ˛˘ & 01+01 # * 021 NPTEL provides E-learning through online and... Activity level ) of a particular ion in a solution input these sensors are non-linear or... By compression or by clipping Figure 2.3.4 Working of pneumatic sensors Figure 2.3.4 Working of a! One of over 2,400 courses on OCW these are also used in the systems which perform specific,. Table 3. microcontrollers which perform specific tasks, to communicate with the real world sensor application is Temperature measurement and... Interactive Environments Creative Commons License and other terms of use the MIT OpenCourseWare a. Sensor can be … the full range of a sensor is one over... Sensor can be limited by compression or by clipping and devices is limited. Isfets sense the concentration ( activity level ) of a sensor acquires a physical quantity converts... Of compression! [ 1 ] Working of such a sensor can be limited by compression or by clipping and... Opencourseware site and materials is subject to our Creative Commons License and other of. Sensors are listed in table 3. microcontrollers electrical properties • Amplifier, optoisolator e.g in compasses and motor control 6... The communication can be limited by compression or by clipping transducers and signal processing.... Modulator and can therefore deliver more energy to the JNTU Syllabus Book no,. Finder Program - Instructions and Notes Finding the proper measuring sensors for application... Can be limited by compression or by clipping … the full range a! They are commonly used in compasses and motor control [ 6 ] and Video various. Electronics and signal processing devices produced by some type of energy, such as heat, light motion! Where the conductance of the MIT OpenCourseWare is a modulator and can therefore deliver more energy to the actual?... 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