electronics for computer engineering (Sensor) by KrisMT Computer Engineering, ICT, University of Phayao

Transcription

1 electronics for computer engineering (Sensor) by KrisMT Computer Engineering, ICT, University of Phayao

2 ห วข อ Sensor =? Each type of sensor Technology Interpolation

3 Sensor =? is a device that measures a measurable attribute and converts it into a signal which can be read by an observer or by an instrument.

4 Acoustic, Sound Microphone is a acoustic-to-electric transducer or sensor that converts sound into an electrical signal. Most microphone today use electromagnetic induction (dynamic microphone), capacitance change (condenser microphone), piezoelectric generation, or light modulation to produce an electrical voltage signal form machine vibration.

5 Chemical smoke detection is a device that detects smoke, typically as an indicator of fire. Most smoke detectors work either by optical detection (photoelectric) or by physical process (ionization), while others use both detection methods to increase sensitivity.

6 Electric current, Electric potential, Magnetic Hall effect sensor is a transducer that varies its output voltage response to a magnetic field. are used for proximity switching, positioning, speed detection, and current sensing application.

7 Environment, Weather, humidity Humidity sensor (ความช น) measure the humidity level by measuring he change in the resistance of an element or the the change in the electrostatic capacity of that element as it absorbs or releases moisture. has a ceramic composition comprising at lease one component having a spinel type cubic symmetry.

8 Flow Water meter (Magnetic Flow Meter) commonly referred to Mag meters, are technically a velocity-type water meter, except that they use electromagnetic properties to determine the water flow velocity, rather than mechanical means which jet and turbine meter use.

9 Navigation instrument Compass Gyroscope

10 Compass Build out of two or three magnetic field sensors that provide data for a microprocessor. The correct heading relative to the compass is calculated using trigonometry. GPS receivers using two or more antenna can now achieve 0.5 degree in heading accuracy and have startup times in seconds rather than hours for gyrocompass system.

11 Gyroscope is a device for measuring or maintaining orientation, based on the principles of angular momentum.

12 Position, Angle, speed, acceleration Accelerometer Rotary Encoder

13 Accelerometer is a device that measures proper acceleration. In engineering, accelerometers can be used to measure vehicle acceleration. can be used to measure vibration on cars, machines, building, process control system.

14 Rotary encoder is an electro-mechanical device that converts the angular position or motion of shaft or axle to an analog or digital code.

15 Optical, light, image Photoresistor (Light Dependent Resistor; LDR) Photodiode & Phototransistor

16 Photoresistor Photoresistor or light dependent resistor (LDR) is a resistor whose resistance decreases with increasing incident light intensity.

17 Photodiode & Phototransistor is a type of photodetector capable of converting light into either current or voltage, depending on mode of operation.

18 Pressure Pressure sensor measures pressure, typically of gases or liquids.

19 Force, density, level Strain gage is device used to measure the strain of object.

20 Thermal, heat, Temperature Thermocouple Thermistor Thermostat

21 Thermocouple is a device consisting of two different conductors (usually metal alloy) that produce a voltage proportional to a temperature difference between either end of the pair of conductors.

22 Thermistor is a type of resistor whose resistance varies significantly with temperature, more so than standard resistor. Thermistors differ from resistance temperature detectors (RTD) in that the material used in thermistor is generally ceramic or polymer, while RTDs use pure metals.

23 Thermostat is a component of control system which regulates the temperature of a system so that system s temperature is maintain near a desired setpoint temperature. does this by switching heating or cooling devices on or off.

24 Technology of sensor MEMS Microelectromechanical system (MEMS) is technology of very small mechanical devices driven by electricity; it merges at nano-scale into nanoelectromechanical system (NEMS) and nanotechnology.

25 Interpolation In the mathematical field of numerical analysis, interpolation is a method of constructing new data points within the range of discrete set of know data points. i(ma) (y 2,x 2 ) (y 1,x 1 ) C

26 Q & A

27 Reference