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Medicion de la temperatura

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Re: Medicion de la temperatura

Notapor pichu » Jue, 10 May 2012, 15:17

Temperature Measurement



32.1 Bimaterials Thermometers
Linear Bimaterial Strip • Industrial Applications • Advanced
Applications • Defining Terms
32.2 Resistive Thermometers
Introduction to Resistance Temperature Detectors •
Resistance of Metals •Who Uses RTDs? Common Assemblies
andApplications • Overview of Platinum RTDs • Temperature
Coefficient of Resistance • RTD Construction • Calibration •
Use of RTDs Today • The Future of RTD Technology •
Defining Terms
32.3 Thermistor Thermometers
Thermal Properties of NTC Thermistors • Electrical
Properties of NTC Thermistors • Linearization and Signal
Conditioning Techniques
32.4 Thermocouple Thermometers
The Simplest Thermocouple • Simple Thermocouple
Thermometry • Thermoelectric Effects • Realistic
Thermocouple Circuits • Grounding, Shielding, and Noise •
Thermal Coupling • Thermocouple Materials • The
Functional Model of Thermoelectric Circuits •
Inhomogeneity • Calibration • Thermocouple Failure and
Validation • Environmental Compatibility • DataAcquisition •
Signal Transmission • Sources of Thermocouple Application
Information • Summary
32.5 Semiconductor Junction Thermometers
The Transistor as a Temperature Sensor • Thermal Properties
of Semiconductors: Defining Equations • Integrated
Temperature Sensors • Other Applications of Semiconductor
Sensing Techniques • Temperature Sensing in Power ICs for
Fault Protection and Diagnostics • Reliability Implications of
Temperature to Electronic Components • Semiconductor
Temperature Sensor Packaging • Defining Terms
32.6 Infrared Thermometers
Thermal Radiation: Physical Laws • Emissivity • Blackbody •
Detectors for Thermal Radiation • Pyrometers • IR
Thermometers • Components of IR Thermometers • Some
Special Applications
32.7 Pyroelectric Thermometers
Pyroelectric Effect • Pyroelectric Materials • Manufacturing
Process • Pyroelectric Sensors • Applications
32.8 Liquid-in-Glass Thermometers
General Description • Liquid Expansion • Time-Constant
Effects • Thermal Capacity Effects • Separated Columns •
Immersion Errors • Organic Liquids • Storage • High
Accuracy • Defining Terms
32.9 Manometric Thermometers
Vapor Pressure • Gas Thermometry
32.10 Temperature Indicators
Melting and Shape/Size Changing Temperature Indicators •
Color-Change Temperature Indicators
32.11 Fiber-Optic Thermometers
Fiber Optic Temperature Sensors • Fiber Optic Point
Temperature Measurement Systems • Distributed and Quasidistributed
Optical Fiber Temperature Measurement
Systems • Applications for Optical Fiber Temperature Probes
pichu
 
Mensajes: 244
Registrado: Vie, 08 Jul 2011, 22:01


Re: Medicion de la temperatura

Notapor charly » Vie, 11 May 2012, 11:41

Thermal Management Handbook por Maxim



Introduction: Thermal Management in Electronic Systems .................................................. 3
Temperature-Sensing Technologies ....................................................................................... 4
Thermistors ............................................................................................................................ 4
NTC Thermistors ................................................................................................................ 4
RTDs ..................................................................................................................................... 7
Thermocouples ...................................................................................................................... 9
Temperature Sensor ICs ...................................................................................................... 12
Analog Temperature Sensor ICs ...................................................................................... 12
Local Digital Temperature Sensor ICs .............................................................................. 14
Other Digital Temperature Sensor Features ................................................................. 16
Remote Digital Temperature Sensors .............................................................................. 18
Remote Temperature Sensor Error Sources ................................................................ 20
Other Remote Sensor Features .................................................................................... 22
Other Types of Thermal Management Components ............................................................ 25
Temperature Switches ......................................................................................................... 25
Fan Speed Controllers ......................................................................................................... 27
Types of Fans ................................................................................................................... 28
Controlling Fan Speed ...................................................................................................... 30
Minimizing the Effects of Fan Speed Control on Acoustical Noise ................................... 33
Monitoring Fan Speed ...................................................................................................... 33
Closed-Loop RPM Control ................................................................................................ 37
Temperature Sensing ....................................................................................................... 38
Closed-Loop, Temperature-Based (Thermal Closed-Loop) Fan Speed Control ........... 38
Signal Conditioners for Non-IC Temperature Sensors ......................................................... 39
Thermistor Conditioners ................................................................................................... 39
RTD Conditioners ............................................................................................................. 40
Thermocouple Conditioners ............................................................................................. 41
Using Thermal Management Components—Principles and Application Circuits ............ 42
Sensing Location: The Key to Choosing the Right Sensor Type .......................................... 42
Remote Diode Sensor Guidelines ........................................................................................ 47
PC Board Layout Guidelines for Remote Sensors ........................................................... 47
Thermal Diode Design Guidelines .................................................................................... 48
Application Examples ........................................................................................................... 50
4-Wire, RTD-to-Digital Conversion ................................................................................... 50
Thermocouple Interface Circuits ....................................................................................... 52
IR-Linked Temperature Sensor ........................................................................................ 53
RS-232-Powered Temperature Sensor ............................................................................ 54
Fan Control Circuits ............................................................................................................. 55
Pulse-Width-Modulated, Fan Power Supply Drive ............................................................ 55
4-Wire Fan Drive .............................................................................................................. 56
Converting PWM Control Signals to Linear Fan Drive ...................................................... 57
Linear Fan Drive ............................................................................................................... 58
High-Voltage Fan Control ..................................................................................................... 59
48V, 4-Wire Fan Speed Control ....................................................................................... 59
48V, PWM Power Supply Fan Speed Controller .............................................................. 60
48V, Linear Fan Speed Controller .................................................................................... 60
Stand-Alone Fan Control Circuits ......................................................................................... 61
Basic On/Off Fan Controllers Using Temperature Switches ............................................. 61
Simple, Two-Speed Fan Controller................................................................................... 64
2
Fan Failsafe Circuit ........................................................................................................... 65
Multispeed, Stand-Alone Fan Control ............................................................................... 66
Temperature Switches ......................................................................................................... 67
In-Circuit Temperature Switch Testing ............................................................................. 67
Thermal Crowbar .............................................................................................................. 67
charly
 
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Registrado: Lun, 11 Jul 2011, 08:56


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