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Principles of Measurement

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Thermocouple. Resistance. Radiation and optical pyrometers. Expansion Thermometer ... Thermocouple. Resistance. Radiation and Optical. Measurement of Pressure ... – PowerPoint PPT presentation

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Title: Principles of Measurement


1
Principles of Measurement
LESSON 1
  • Let the Games Begin!

2
Objectives
  • Measurement of temperature and pressure
  • Units of measurement
  • Measurement devices

3
Purpose of Measuring Devices
  • Why essential to proper operation of propulsion
    plants?

4
WHAT IS TEMPERATURE?
  • An indication of the internal energy contained in
    a substance
  • Mono-Atomic Gases Linearly proportional
  • Poly-Atomic Gases translational, rotational and
    vibrational kinetic energy.
  • Temp is a measure of but not directly
    proportional to internal kinetic energy.

5
Measurement of Temperature
  • Relative Scales
  • Fahrenheit (F)
  • Celsius (C)
  • Absolute Scales
  • Rankine (R)
  • Kelvin (K)

6
Temperature Relationships
  • (F) 9/5(C) 32
  • (C) 5/9(F) 32
  • (F) (R) 459.67
  • (C) (K) 273.15

7
Sensors
8
Principle of OperationTemperature Devices
  • Expansion Thermometers
  • Liquid in glass
  • Bimetallic
  • Filled system/distant reading
  • Pyrometers
  • Thermocouple
  • Resistance
  • Radiation and optical pyrometers

9
Expansion Thermometer
  • Liquid in Glass
  • Bimetallic
  • Filled System/Distant Reading

10
Expansion Thermometer
  • Liquid in Glass
  • Bimetallic
  • Filled System/Distant Reading

11
Expansion Thermometer
  • Liquid in Glass
  • Bimetallic
  • Filled System/Distant Reading

12
Expansion Thermometer
  • Liquid in Glass
  • Bimetallic
  • Filled System/Distant Reading

13
Pyrometers
  • Thermocouple
  • Resistance
  • Radiation and Optical

14
Pyrometers
  • Thermocouple
  • Resistance
  • Radiation and Optical

15
Pyrometers
  • Thermocouple
  • Resistance
  • Radiation and Optical

16
Pyrometers
  • Thermocouple
  • Resistance
  • Radiation and Optical

17
Measurement of Pressure
  • Definition Force per unit area
  • Units of measurement
  • Pounds force per square inch (psi)
  • Inches Hg or inches H2O (Hg)
  • Atmospheres (atm)

18
Pressure Relationships
  • Gage pressure (PSIG)
  • Absolute pressure (PSIA)
  • Vacuum pressure (PSIV) or (in Hg)
  • Atmospheric pressure (14.7 psi)

19
Pressure Relationships
  • Absolute Pressure Atmospheric Press.
    Gage Press.
  • Vacuum Atmospheric Pressure - Absolute
    Pressure

20
Pressure Relationships
30 PSIA
15.3 PSIG
GAGE PRESSURE (PSIG)
ABSOLUTE PRESSURE (PSIA)
Atmospheric Pressure
14.7 PSIA
0 PSIG
(Average at Sea Level)
0 In. Hg
VACUUM (in. Hg)
0 PSIA
29.92 In. Hg
21
Operation of Pressure Measuring Devices
  • Manometers
  • Bourdon tube
  • Bellows gage

22
Operation of Pressure Measuring Devices
  • Manometers
  • Bourdon tube
  • Bellows gage

23
Operation of Pressure Measuring Devices
  • Manometers
  • Bourdon tube
  • Bellows gage

24
Operation of Pressure Measuring Devices
  • Manometers
  • Bourdon tube
  • Bellows gage

25
Questions?
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