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Using a First Surface Mirror

Proper conduct of an infrared inspection requires line of sight access to the object(s) being inspected. A first surface mirror can often be utilized to inspect components that may be obstructed or obscured.

A first surface mirror is a special optical mirror that has a highly reflective coating adhered to the front of the mirror substrate. For infrared inspections, first surface mirrors can be temporarily utilized as reflectors to inspect areas that are inaccessible or unsafe for a thermographer to enter.

When using a first surface mirror with your infrared imager, keep the following in mind:

• Select a mirror of sufficient size for the selected imager and target
• Inspect mirror prior to use for cleanliness and condition
• Place the mirror in the optical path between the imager and object being inspected
• Position the mirror so that the reflective side of the mirror faces the imager
• Inspect object by imaging mirror surface

First surface mirrors are commercially available from a number of scientific suppliers that deal with optics and lasers. When using a first surface mirror, be certain to follow necessary safety precautions, especially when working near energized electrical components.

The use of first surface mirrors and proper inspection techniques are two of the many topics covered in all Infraspection Institute Certified Infrared Thermographer® training courses. For more information on open enrollment classes or our Distance Learning courses, call 609-239-4788 or visit us online at infraspection.com.