Sensor classifications Physical property to be monitored determines type of required sensor Type Examples Temperature hermistors, thermocouples Pressure Pressure gauges, barometers, ionization gauges Optical Photodiodes, phototransistors, infrared sensors, CCD sensors Acoustic Piezoelectric resonators, microphones Mechanical Strain gauges, tactile sensors, capacitive diaphragms, piezoresistive cells Motion vibration Accelerometers mass air flow sensors Position GPS, ultrasound-based sensors infrared-based sensors inclinometers Electromagnetic Hall-effect sensors magnetometers Chemical pH sensors, electrochemical sensors, infrared gas sensors Humidity Capacitive and resistive sensors hygrometers, mEMs-based humidity sensors Radiation lonization detectors, Geiger-Mueller countersSensor Classifications • Physical property to be monitored determines type of required sensor Type Examples Temperature Thermistors, thermocouples Pressure Pressure gauges, barometers, ionization gauges Optical Photodiodes, phototransistors, infrared sensors, CCD sensors Acoustic Piezoelectric resonators, microphones Mechanical Strain gauges, tactile sensors, capacitive diaphragms, piezoresistive cells Motion, vibration Accelerometers, mass air flow sensors Position GPS, ultrasound-based sensors, infrared-based sensors, inclinometers Electromagnetic Hall-effect sensors, magnetometers Chemical pH sensors, electrochemical sensors, infrared gas sensors Humidity Capacitive and resistive sensors, hygrometers, MEMS-based humidity sensors Radiation Ionization detectors, Geiger-Mueller counters