Lecture 2: Sensors. Zheng-Hua Tan
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1 Instrumentation and data acquisition Spring 2010 Lecture 2: Sensors Zheng-Hua Tan Multimedia Information and Signal Processing Department of Electronic Systems Aalborg University, Denmark Instrumentation and data acquisition, II, Acquire, process and output data Part 1Sensors Part 2 Computers Part 1 Actuators Acquire and Store and/or Act on physical convert measured process the input parameter/world phys. parameter to signal/data to based on electrical signal obtain information signal/data Examples Examples Examples -Light intensity -Temperature -Sound -Pressure -Humidity -ph -Radiation -Motion -Etc. ADC -PC -Calculator -Mobile phone -PDA -DVD player -Industrial robot -Digital camera -Toys -Etc. DAC -Electrical motor -Loud speaker -Pump -Lifting columns -Valve -Switch -Display (LCD,CRT) -Light bulb -Etc. Instrumentation and data acquisition, II,
2 Outline Circuit theory Strain gauge Signals and systems Instrumentation and data acquisition, II, Voltage and Current Sources A voltage source is any device or system that produces an electromotive force between its terminals. Real voltage sources can be represented as ideal voltage sources in series with a resistance r, the ideal voltage source having zero resistance. Real current sources can be represented as ideal current sources in parallel with a resistance r, the ideal current source having infinite resistance. An ideal voltage source, V, driving a resistor, R, and creating a current I Reading: The art of electronics Instrumentation and data acquisition, II,
3 Ohm's Law The ratio of voltage to current is called the resistance. The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it. Instrumentation and data acquisition, II, Voltage Law (Kirchhoff's circuit laws) The voltage changes around any closed loop must sum to zero. Instrumentation and data acquisition, II,
4 Current Law (Kirchhoff's circuit laws) The electric current in amperes that flows into any junction in an electric circuit is equal to the current which flows out. Instrumentation and data acquisition, II, Resistor network Parallel resistors Series resistors Instrumentation and data acquisition, II,
5 Using transducer Instrumentation and data acquisition, II, Strain gauges A strain gauge is a device used to measure the strain of an object Instrumentation and data acquisition, II,
6 Signal What is a signal A description of how one parameter is related to another parameter Examples v The voltage varies with time t 11 Signal The Speech Signal The ECG Signal 12 6
7 System An entity that responds to a signal input system output Examples Circuitit 13 Sinusoidal CT Signals Oppenheim et al. Signals and Systems, Prentice Hall, 1997, p
8 LTI systems and responses Linear time-invariant (LTI) system Impulse response (p.96) Step response (p.115) System function and frequency response (p. 227) Frequency-selective filters (p.236) Instrumentation and data acquisition, II,
Lecture 3: Sensors, signals, ADC and DAC
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