USU ECE 5320 - Infrared Emission Thermometers

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ECE5320 Mechatronics Infrared Emission ThermometersOutlineReference listTo explore furtherMajor applicationsMajor applicationsBasic Working PrincipleSlide 8Slide 9Slide 10A typical sample configurationMajor SpecificationsSlide 13Slide 14Slide 15LimitationsHow to choose an IR Emission ThermometerCostECE5320 MechatronicsInfrared Emission ThermometersPrepared by:Augusto RodríguezDept. of Electrical and Computer Engineering Utah State [email protected]; (435) 213-11853/6/200901/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-2Outline –Reference list–To explore further–Major applications–Basic working principle illustrated–A typical sample configuration in application (application notes)–Major specifications–Limitations–How to choose an IR thermometer–Cost01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-3Reference list•[1]Mechatronics Handbook, The. Robert H. Bishop.•[2]Measurement, Instrumentation and Sensors Handbook, The. John G. Webster.•[3]Use Of Infrared Emission Detection Thermometer. The Hong Kong College of Family Physicians.•[4]http://www.pyrometer.com/processheating.html •[5] http://www.evergreenengineering.com01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-4To explore further •The Accuracy of Oral Predictive and Infrared Emission Detection Tympanic Thermometers in an Emergency Department Setting.–http://www3.interscience.wiley.com/cgi-bin/fulltext/119827218/PDFSTART •Infrared thermometer with automatic calibration.–http://www.google.com/patents?hl=en&lr=&vid=USPAT4784149&id=hEEvAAAAEBAJ&oi=fnd&dq=infrared+emission+thermometers.•Sensitivity of simple infrared thermometers.–http://www.iop.org/EJ/article/0022-3735/16/7/012/jev16i7p613.pdf?request-id=d0aa9b0e-c47a-4d7e-9be4-39f8d5106dd101/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-5Major applications •Temperature measurement of semiconductor materials during fabrication process.–Sometimes it is necessary to coat the semiconductor with a high emissive material due to the low emissivity of the semiconductor. Wafer, semiconductor[5]Major applications•Medical applications:–Skin temperature measurement.–Body temperature measurement. Sometimes, this is measured by getting the tympanic membrance temperature.•Detecting clouds for remote telescope operation.•Checking mechanical equipment or electrical circuit breaker boxes or outlets for hot spots.•Checking heater or oven temperature, for calibration and control purposes•Detecting hot spots / performing diagnostics in electrical circuit board manufacturing•Checking for hot spots in fire fighting situations•Monitoring materials in process of heating and cooling, for research and development or manufacturing quality control situations01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-6Basic Working Principle•IR emission thermomethers are classifiead as non-contact thermometers since they don’t need to be in contact with the object being monitored. •These sensors work based on the infrared emissions from the object being measured.01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-7Basic Working Principle•IR Emission Thermometers work based on the principle that all objects whose temperature is above the absolute zero radiate electromagnetic waves whose spectrum is associated to its surface temperature.•Ideally, an IR thermometer consist of a sensor and a detector.–The sensor monitors the temperature of a detector.–The detector gets the radiative heat transfer of the object’s surface. •However, the detector has loss and its range of sensing is not restricted to the object being measured.–Optical devices are used to limit the range of the detector to the object being measured.01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-8Basic Working Principle01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-9The operating principle of the IR thermometer is based on Stefan-Boltzmann law:Where:•Tc is the object’s temperature in Kelvin.• is the net thermal radiation flux.•Ts is the sensor’s surface temperature• :Emissivity of the object.Basic Working Principle01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-10Simple diagram of IR a thermometer [4].A typical sample configuration•Measuring the temperature of a semiconductor material during fabrication.01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-11Diffused-light thermometer for measuring temperature of GaAs wafers [2].Major Specifications•Response time:–IR thermometers’ response time is around one second, which is relatively fast. However, their warm up time is relatively large.01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-12Major Specifications•Electromagnetic Spectrum: the infrared thermometers measure the temperature in the range of 0.7 to 80 µm.01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-13IR Spectrum [4].Major Specifications01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-14• Materials used.[2]Major Specifications•Temperature error: –Uncertainties in the emissivity of the object to measure may result in errors in the measured temperature.01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-15Limitations•There is a limited variety of lenses an filter that can be choosen to build IR Emission Termometers.•IR refractive materials have high absorption of light. Thus, there is a limitation with lenses since they need to be relatively thick.01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-16How to choose an IR Emission Thermometer•Several factors have to be taken into account before selecting an IR termometer:–Distance to object.–Target temperature range.–Object’s material.–Object’s size.–Ambient temperature.–Gases that might be interfering.01/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-17Cost•Depending on the added features and manufacturer, cost may vary from USD $2, 000 to USD $50.0001/15/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-18They can be easely bought


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USU ECE 5320 - Infrared Emission Thermometers

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