Passive thermography relies upon the naturally occurring thermal light emitted from an object or process for condition evaluation. With passive thermography, thermal contrast is only observed with an infrared camera if the target’s temperature differs from the ambient temperature or surrounding objects. The resulting thermal image will show little variation in color or greyscale if there is no thermal contrast.
Any temperature distribution of the object or scene is evaluated without imposing external energy on the object. The observed temperature patterns are due solely to the inherent temperature differences.
Examples of passive thermography include the electrical substation, and microelectronics inspection discussed previously. Other examples include the inspection of a motor to be sure it is cooling properly or inspecting electrical relays to ensure they are working correctly. Each of these inspection examples relies upon the presence of a variation in temperature or variation of emitted infrared light resulting from the normal operation of the process.
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