Sensors, as we all know “senses” a particular thing, it can be heat,touch,pressure or anything. We use a lot of sensors around us. For example a thermometer is basic example of sensor as the mercury senses the body heat and shoes the results.
The various types of sensors are:
- Temperature Sensor- As the name suggests,this type of sensor is used to sense the temperature. It consists of 2 types-mechanical and electrical temperature sensors. The major sensors under this category are : Thermometer, Bi-metal, Thermocouple, Thermistor and Resistance thermometer.
- Pressure sensor- This type of sensor is used to measure the pressure. Pressure sensors can also be used to indirectly measure other variables such as fluid/gas flow, speed, water level, and altitude. Pressure sensors can alternatively be called pressure transducers, pressure transmitters, pressure senders, pressure indicators, piezometers and manometers
- Ultrasonic sensor- Ultrasonic transducers are transducers that convert ultrasound waves to electrical signals or vice versa. Those that both transmit and receive may also be called ultrasound transceivers; many ultrasound sensors besides being sensors are indeed transceivers because they can both sense and transmit.
- The acceleration sensor- The triaxial acceleration sensor family is specifically designed for low-power applications to enhance functionality in mobile phones and consumer electronic devices.
- Displacement sensor-Capacitive displacement sensors are used in a wide variety of applications including semiconductor processing, assembly of precision equipment such as disk drives, precision thickness measurements, machine tool metrology and assembly line testing. These types of sensors can be found in machining and manufacturing facilities around the world.
All these sensors are used to measure various quantities and have various architectures. There are around thousands of further types of sensors under these categories but the basic work remains the same that is to sense and do the desired work.
- Sensors networks allow a system to be extended from one with basic functions to one that can receive and act on data about the environment it operates in.
- Sensors such as PIR detectors are relatively cheap if using wired versions.
- Users need to decide carefully if they wish to be monitored 24 hours a day by a computer system. Many will not feel comfortable being in this situation, as there seems to be a lot of distrust of technology – especially among older people.
- A Sensor Network may require a lot of additional wiring to be installed around the house to allow sensors to work – unless the sensors used are wireless. Using wireless makes sensor devices much more expensive. Retrofitting an existing home rather than a new build could cause a lot of upheaval for the period of the installation.