Proper Spectral Response
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Choosing the proper equipment for an infrared inspection is of paramount importance when performing an infrared inspection. Each model of infrared imaging system has many unique operating characteristics which must be considered before a project is undertaken. Of these, perhaps the most important is spectral response.
Spectral response for an imager generally falls into two categories: 2-5 microns (near infrared) or 8-14 microns (far infrared). Because spectral response can limit one’s ability to accurately perform certain types of inspections, it is critical that a thermographer understand how spectral response can affect his/her work.
Below are some generally recommended spectral responses for different types of P/PM applications.
| Application | 2-5 microns | 8-14 microns |
| Indoor electrical systems | X | X |
| Outdoor electrical systems | X | |
| Photovoltaic panels | X | X |
| High temperature targets | X | |
| Highly reflective targets | X | |
| Boiler/heater tubes – gas fired |
X | |
| Long distance imaging | X | |
| Smooth surfaced roofs | X | |
| Gravel surfaced roofs | X | X |
| Glass | X | |
| Plastics Optical Gas Imaging (OGI) - choose a wavelength where the sought-after gas is opaque. | X |
Infrared equipment selection and operation are two of the many topics covered in all Infraspection Institute Level I training courses. For information on course locations and dates or our Distance Learning Program, visit www.infraspection.com or call us at 609-239-4788.
