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MECH 182 Experimental Methods

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Department of Mechanical Engineering. Hong Kong University of ... Potentiometer. E. V. R2. R1. if =R2/R1 1. HKUST. Dept. of ME. Wheastone Bridge. E. V. R2. R1 ... – PowerPoint PPT presentation

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Title: MECH 182 Experimental Methods


1
MECH 182Experimental Methods
Dr. S-W. Ricky Lee Department of Mechanical
Engineering Hong Kong University of Science and
Technology Clear Water Bay, Kowloon, Hong Kong
Lecture 3
2
Basic Electrical Instrumentation for
Measurements (I)
1. Introduction 2. Review on Electricity 3.
Sensors Transducers 4. Basic Conditioning
Circuits
3
Introduction
4
Flow Chart of Measurements
Quantities to be measured
Sensors Transducers
Signal Conditioning Circuits
Data Recording Processing
5
Typical Physical Quantities
6
Typical Measuring Devices
7
Other Instrumentation
8
Review on Electricity
9
Basic Terminology
-
-
Charge (C)
Voltage (V)

Electric Field (V/mm)
Current (A)
-
-
10
Fundamental Laws
(?)
E
)
(pF)
(nH)
11
Piezoelectric Effects
Piezo Effect
Converse Piezo Effect
12
Sensors Transducers
13
What are Transducers?
Transducers are electromechanical devices which
convert a mechanical quantity change into a
change in an electrical signal which can be
monitored as a voltage/current/charge after
conditioning.
14
Linear Variable Differential Transformer(LVDT)
E
V
(Inductive Transducer)
15
Proximity Sensor
To AC Power Supply

d
Target
(Capacitive Transducer)
16
Strain Gauge
a
a
--- Gauge Factor
(Resistive Transducer)
17
Piezoelectric Sensors
M
M
Pressure Sensors
Accelerometer
18
Thermo Couple
Material B
Material B
V
Material A
T1
T2
Seebeck Effect
VSA/B(T1-T2)
19
Basic Conditioning Circuits
20
Potentiometer
if ?R2/R1gtgt1
21
Wheastone Bridge
R1
R2
E

V
let ?R2/R1 linear
R4
R3
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