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Infrared Thermography (IRT)
Infrared thermography is the leading non-invasive and non-destructive method used to detect and localize material defects, short circuits, and other powered failures. It works by analyzing the heat dissipation that results from these device faults.
Infrared thermography can be used to measure the heat distribution in integrated circuits (die) and printed circuit boards, and nearly any powered device to detect hot spots.
- Works well for Ohmic and metallic short-circuits
- Wide temperature range
- Low-power failure sites (< 3 mW)
- Devices with high power dissipation and low power failure sites (thermal signature masking)
- Obstruction by thick metals or other thermally conductive materials impairs analysis
IRT image showing a hot spot in upper right corner of a flip-chip die: differential/subtraction mode.
Thermal image captured of a spinning car tire
Thermogram of a domestic cat showing increased temperature near brain and in face.
From: Wikimedia Commons (image captured by Lcamtuf)
- Failure site power dissipation of >3mW
- Some height clearances apply for camera optics, depending on required magnification
- Samples requiring fine probing are not well suited for this analysis – to see if your sample would be a good fit, please contact us.
Infrared thermography (IRT), also called thermal imaging or infrared thermographic imaging, maps thermal radiation intensity/wavelength (correlating to material temperature) in the same way that a standard camera maps visible light.
IR light is emitted by all materials and is directly tied to temperature, and thus the radiation/emission sites can be used to localize powered failures or quantify sample temperatures.
The detected IR signal is captured over a specialized pixel array, which correlates the IR light at each pixel-point to a given color or grayscale value indicative of temperature. Contrast in thermal images (called “thermograms”) is generated from the difference in thermal energy between pixels. While each pixel contains accurate quantitative temperature measurement, the relative temperature difference between pixels makes up the thermal contrast in the image. Using this, minor changes in temperature can be detected and localized.
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