Industrial SensorsIndustrial Sensors Sharif（工业SensorsIndustrial传感器谢里夫）.pdf

Industrial Sensors Industrial Sensors • Proximity – Mechanical – Optical – Inductive/Capacitive • Position/Velocity – Potentiometer – LVDT – Encoders – Tachogenerator • Force/Pressure • Vibration/acceleration 1 Definitions Proximity Sensors Definitions Proximity Sensors • Accuracy: The agreement between the actual • Widely used in general industrial automation value and the measured value – Conveyor lines (counting,jam detection, etc) • Resolution: The change in measured variable – Machine tools (safety interlock, sequencing) to which the sensor will respond • Usually digital (on/off) sensors detecting the • Repeatability: Variation of sensor presence or absence of an object measurements when the same quantity is • Consist of: measured several times – Sensor head: optical, inductive, capacitive • Range: Upper and lower limits of the variable – Detector circuit that can be measured – Amplifier • Sensitivity and Linearity – Output circuit: TTL, solid state relay Example Mechanical