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Healthcare Internet of Things – The Role of Communication Tools and Technologies
Published in Naveen Chilamkurti, T. Poongodi, Balamurugan Balusamy, Blockchain, Internet of Things, and Artificial Intelligence, 2021
K. Lalitha, D. Rajesh Kumar, C. Poongodi, Jeevanantham Arumugam
Proximity sensors are sub-categorized as follows:Inductive proximity sensors can work at higher speeds compared to the mechanical switches and also these sensors are utilized to discover the occurrence of metal objects by means of an electromagnetic radiation rays or an electromagnetic field.In a very large portion of the target, capacitive sensors are used to sense the presence of tiny objects. Hence, capacitive sensors are normally used in very difficult, and most complicated, applications.Photoelectric sensors utilizes a beam of light to identify the absence or presence of any object since it is made up of light sensitive parts. It is the suitable replacement for inductive sensors and its main centre of attention is on long distance sensing.Motion Detector Sensors
IoT Framework Based on WSN Infrastructure with Different Topological Distributions
Published in Ricardo Armentano, Robin Singh Bhadoria, Parag Chatterjee, Ganesh Chandra Deka, The Internet of Things, 2017
Marcel Stefan Wagner, Diogo Ferreira, Lima Filho, Miguel Arjona Ramírez, Wagner Luiz Zucchi
The photoelectric sensors are used in a lot of applications, including: control, embedded electronics, security systems, industrial machinery, and medical equipment. The purpose of a photoelectric sensor is to convert a light signal (light or shadow) into an electrical signal that can be processed by an electronic circuit. LDR falls in the photo-sensors conductive type and is also known as photo-resistor. In them, the resistance to electric current flow depends on the intensity of light incident on a sensitive surface of cadmium sulphide material. The typical assembly of this sensor is intended to maximize the sensitive area of its electrodes, forming the structure shown in Figure 6.9.
Servo Feedback Devices and Motor Sensors
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
There are three major types of photoelectric sensors: through-beam, retroreflective, and diffuse-reflective (Figure 8.36). Each type has its own strengths and weaknesses, as well as an effective scope of application. Nevertheless, all offer reliable, precise, and wide sensing ranges.
A review of chewing detection for automated dietary monitoring
Published in Journal of the Chinese Institute of Engineers, 2022
Yanxin Wei, Khairun Nisa’ Minhad, Nur Asmiza Selamat, Sawal Hamid Md Ali, Mohammad Arif Sobhan Bhuiyan, Kelvin Jian Aun Ooi, Siti Balqis Samdin
Photoelectric sensors comprise an emitter light source (LED), a photodiode, or a phototransistor receiver to detect emitted light (Kinney 2001). Supporting electronic equipment is also present to amplify receiver signals. The emitter transmits a beam of visible or infrared light to the receiver. Ultrasonic sensors can detect objects by using sound waves. In this case, color and transparency do not affect objects.