sensors and its types pdf

Sensors And Its Types Pdf

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The world is full of sensors.

Sensors are everywhere. Sensors have been around for a long time. The first thermostat was introduced in the late s and infrared sensors have been around since the late s.

Different Types of Sensors

The world is full of sensors. In our day-to-day life, we come across automation in all the activities. Automation includes turning on lights and fans using mobile phones, controlling TV using mobile apps, adjusting the room temperature, smoke detectors, etc. All these are done with help of sensors. These days, any embedded system based product has inbuilt sensors in it. There are many applications like Mobile controlled CCTV camera, weather monitoring and prediction apps, etc.

Sensors play a very vital role in Healthcare monitoring and detection. Therefore, before building an application-using sensor, we must understand what exactly does a sensor do and how many types of sensors are available. A sensor is defined as a device or a module that helps to detect any changes in physical quantity like pressure, force or electrical quantity like current or any other form of energy.

After observing the changes, sensor sends the detected input to a microcontroller or microprocessor. Finally, a sensor produces a readable output signal, which can be either optical, electrical, or any form of signal that corresponds to change in input signal. In any measurement system, sensors play a major role. In fact, sensors are the first element in the block diagram of measurement system, which comes in direct contact with the variables to produce a valid output. Now you know What Sensor Actually Means?

Active sensors are the type of sensors that produces output signal with help of external excitation supply. The own physical properties of the sensor varies with respect to the applied external effect. Therefore, it is also called as Self Generating Sensors.

Examples: LVDT and strain gauge. Passive sensors are the type of sensors that produces output signal without the help of external excitation supply. They do not need any extra stimulus or voltage. Example: Thermocouple, which generates a voltage value corresponding to the heat, applied.

It does not require any external power supply. Different types of digital and analog sensors are listed below one by one with their applications. Types of sensors are listed below and we will discuses the usual types one by one in details with uses and applications. Click image to enlarge. The sensor that produces continuous signal with respect to time with analog output is called as Analog sensors.

The analog output generated is proportional to the measured or the input given to the system. Generally, analog voltage in the range of 0 to 5 V or current is produced as the output. The various physical parameters like temperature, stress, pressure, displacement, etc. Examples: accelerometers, speed sensors, pressure sensors, light sensors, temperature sensors.

When we look into electromagnetic spectrum, infrared region is divided into three regions as Near Infrared, mid Infrared and far Infrared region. Infrared spectrum has a higher frequency range than microwave and lesser frequency than visible light. An infrared sensor is used for emitting and detecting IR radiation. By this principle, IR sensor can be used as Obstacle detector. Examples like thermocouple, pyro electric detector and bolometers comes under passive sensors. LED or laser diode act as IR source.

Photodiode or phototransistors acts as IR detector. As discussed analog sensor produces signals that are continuously varying with time. The output value from the sensor will be very small in range of microvolts or milli volts.

Due to this, signal-conditioning circuits are required for amplification. Analog to digital ADC converters are used to convert the analog signal obtained into a digital value. Temperature sensor sense the temperature and measures the changes in the temperature.

Proximity sensor is a type of non-contact sensor used for object detection. It does not have any physical contact with the object. The object whose distance is to be measured is known as target. An IR light or electromagnetic radiation is used in a proximity sensor. There are different types of proximity sensors like Inductive, capacitive , Ultrasonic, etc.

Ultrasonic sensors are used to measure distance or travel time using ultrasonic waves. A source will be used to emit ultrasonic wave. After wave hits the target, the waves are reflected and the detector collects the signal. The travel time between the transmitted wave and reflected wave is measured using Ultrasonic sensor.

Optical sensors use two different element for transmitter and receiver. Whereas ultrasonic sensor uses single element for transmission and reception. Accelerometer is a type of sensor that is used to detect changes in position, velocity, and vibration by sensing motion. It can be either analog or digital type.

In analog accelerometer, depending on volume of acceleration applied to accelerometer, continuous analog voltage signal is produced. In other words, Gyroscope measure any rotation and unaffected by acceleration and Accelerometer cannot distinguish rotation from acceleration and unable to work when in center of rotation. Pressure sensor works on the application of input voltage and pressure value. It produces an analog output voltage.

The sensor that works on principle of magnetic effect is called Hall Effect sensor. Magnetic field is the input and electrical signal is the output. External magnetic field is applied to activate Hall Effect sensor.

All magnets have two important characteristics namely Flux density and polarity. Magnetic flux density is always present around the object. Therefore, the Hall Effect sensor output will be function of the flux density. Applications: One of the main uses of magnetic sensors is in automotive systems for the sensing of position, distance and speed. For example, the angular position of the crankshaft for the firing angle of the spark plugs, the position of the car seats and seat belts for air-bag control or wheel speed detection for the anti-lock braking system, ABS.

Load cell is used to measure weight. The input is force or pressure and output is electrical voltage value. Load cell measures weight of the object by indirect method. There are few types of load cells namely Beam load cell, Single point load cell and compression load cell. Beam load cell: Used in industrial applications like machinery, tank weighing, medical equipment. Single Point load cell: These are used for low weight measurement applications like waste collections and machinery.

Compression Load cell: Used for high weight measuring applications like Medical device, to control pump. To detect hidden tracks, discontinuities in metals, composites, plastics, ceramics, and for water level detection.

When data is converted and transmitted digitally, it is called as Digital sensors. Digital sensors are the one, which produces discrete output signals. The measuring quantity will be represented in digital format. A digital sensor consists of sensor, cable and a transmitter. The measured signal is converted into a digital signal inside sensor itself without any external component.

Cable is used for long distance transmission. A disc is attached to the rotating shaft. Rotating shaft has transparent slots on its circumference. When the shaft rotates at a speed, the disc also rotates with it. The sensor passes through each slot on the shaft, which produces an output pulse as either logic 1 or logic 0.

A digital accelerometer generates variable frequency square wave output. The method of producing square wave is pulse-width modulation PWM. The output from PWM signal, pulse width is directly proportional to acceleration value. Other types of digital sensors are : Digital Temperature Sensor, Encoders etc. IR Sensor Applications:.

Radiation thermometers: It works due to presence of IR sensor. The temperature of an object is measured with Radiation thermometers. IR Imaging devices: IR sensors are used to image objects. They are used in Thermography cameras, which are used as Noninvasive imaging technique. They use infrared light as source for communication. TV remote consists of buttons and PCB.

PCB consists of electrical circuit which is used to sense or detect the button that is pressed. Once the button is pressed, the signal is transmitted in form or Morse code. Transistors are used for amplification of the signal.

Top 10 IoT Sensor Types

Sensors are everywhere. Sensors have been around for a long time. The first thermostat was introduced in the late s and infrared sensors have been around since the late s. Broadly speaking, sensors are devices that detect and respond to changes in an environment. Inputs can come from a variety of sources such as light, temperature, motion and pressure. Sensors output valuable information and if they are connected to a network, they can share data with other connected devices and management systems.

The types of sensors are very wide, and we can use different criteria to classify them, such as their conversion principles basic physical or chemical effects of sensor work , their uses, their output signal types, and the materials and processes that make them. Before learning about the type of sensor, you need to know what a sensor is. The definition of "sensor" in the Webster's Dictionary is a device that responds to a physical stimulus such as heat, light, sound, pressure, magnetism, or a particular motion and transmits a resulting impulse as for measurement or operating a control. According to this definition, the role of the sensor is to convert one energy into another energy form, so many scholars also use "Transducer" to refer to "Sensor". Types of Sensors. X Special Types of Sensors.

types of sensors a) Active vs. 2) Passive sensors: The output power is almost entirely provided by 2) Analog sensors: The signal produced by the sensor is.

What is a Sensor? Different Types of Sensors with Applications

We live in a World of Sensors. You can find different types of Sensors in our homes, offices, cars etc. All these and many other automation tasks are possible because of Sensors. Before going in to the details of What is a Sensor, What are the Different Types of Sensors and Applications of these different types of Sensors, we will first take a look at a simple example of an automated system, which is possible because of Sensors and many other components as well. The example we are talking about here is the Autopilot System in aircrafts.

Welcome to Thomasnet. Below you will find comprehensive information on the types of products, their suppliers and manufacturers, sensor applications in industry, considerations, and important attributes. Many types of sensors, detectors, and transducers are available including those for detecting a physical presence such as flame, metals, leaks, levels, or gas and chemicals, among others. Some are designed to sense physical properties such as temperature, pressure, or radiation, while others can detect motion or proximity. They operate in a variety of manners depending on the application and may include electromagnetic fields, or optics, among others.

Generally, we use conventional wall socket switchboards for switching on industrial appliances or home appliances such as fan, cooler, industrial motors, and so on. But, it is very difficult to operate the switches regularly. Hence, home automation and industrial automation systems are developed for ease of controlling all the required electrical and electronics loads.

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The era of automation has begun already. Most of the things that we use now can be automated.

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Sensors - A Complete Guide (Types, Applications, and Suppliers)


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