Infrared Quick Help

Surface Is:

• Too Hot to Be Measured With Thermocouples
• Too Large to Be Measured Without a Very Large Number of Thermocouples
• Moving Too Much for Thermocouple Lead Wire to Accept Without Breaking
• At So High an Electrical Potential That Use of a Thermocouple Would Be Dangerous
• Low in Mass That The Thermocouple Itself Will Affect the Unknown Surface Temperature
• Too Fragile or Wet to Accommodate Thermocouple Contact
• Too Active (Chemically) to Accept a Thermocouple or Its Probe
• In an Atmosphere That Is Hostile to a Thermocouple
• Inaccessible to a Thermocouple or Its Instrumentation
• Near Noise Producing Electric or Magnetic Fields

Key Infrared Application Factors

• Target Spot Size and Distance
• Target Material (for Emissivity)
• Fixed or Handheld Unit
• Temperature Range
• Response Time
• Sighting System
• Environment
• Viewing Port
• Options Needed

Determination of Infrared Emissivity

• Measure Surface Temperature by Some Other Means (After Stopping Motion)
• Place Masking Tape on Surface (Emissivity 0.95)
• Drill Hole in Surface At Least Six Times as Deep as It Is Wide (Emissivity 0.95)
• Paint Surface Dull Black (M IR Region)
• Look up Emissivity in Table (Last Resort)

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