What does EMI stand for?

• A. Electromagnetic Interference
• B. Electromagnetic Induction
• C. Electrical Emission Index
• D. Electronic Measurement Instrument

Answer: (A)

EMI stands for electromagnetic interference—the unwanted disturbance that affects electrical circuits and electronic equipment. In infrared work, this disturbance can show up as noise on sensor signals, degraded image quality, or erroneous measurements, coming from nearby devices, power infrastructure, or even the camera’s own electronics. That’s why this term specifically denotes interference, not a process or a tool. For contrast: electromagnetic induction is about generating current from a changing magnetic field, which is a different concept used in transformers and generators; electrical emission index isn’t a recognized term in this field; and electronic measurement instrument refers to devices used to measure electrical quantities, not the disruptive effect itself. Recognizing EMI helps you appreciate the need for shielding, grounding, and proper layout to keep thermography results accurate.