Poor Emitter
Emissivity = 0.1 Reflectivity = 0.9

Emissivity

An important concept needed to understand how temperature is mea- sured using infrared radiation is the one of emissivity. Emissivity is a surface property which determines just how well an object’s tempera- ture can be measured by an infrared device. Emissivity (along with background thermal radiation) is the primary source of errors in infra- red temperature measurement. Emissivity can be more easily under- stood if it is realized that infrared has similar properties to visible light.

Simply stated, emissivity is the opposite of reflectivity. A perfect mirror has a reflectivity of unity and an emissivity of zero. A perfect black body has an emis- sivity of unity and a reflectivity of zero. In actuality, all real bodies (including human ones) have an emissivity between these two limits.

It is not possible to accurately measure the surface temperature of any body with an emissivity of less than 1.0 without making a correction for this source of error. Hu- man skin is near but not equal to 1.0 and, if

1.0not accounted for, can introduce errors in the order of one to two degrees. The cup-

like mirror used in the nosepiece of the DermaTemp scanner removes this source of error by trapping all of the radiation from the skin surface and in effect causing the skin surface to act like a black body with an

emissivity of 1.0.

Blackbody

Emissivity =1.0 Reflectivity = 0.0

1.0

Mirrors figure prominently in the discus- sion of heat radiation and emissivity. Since heat and light radiation behave the same way, we can use what we see with our eyes as examples of what the DermaTemp sees. When you look in the mirror, you see only reflections, nothing of the mirror itself. If the mirror is per- fect, it has 100% reflectivity. Because it reflects everything, it emits nothing. For this condition, the emissivity is zero.

If we consider an imperfect mirror, the eye then sees mostly reflection, but also some of the imperfections on the mirror surface. If, for ex

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Exergen DT 1001-LT, DT 1001-RS, DT 1001-LN manual Emissivity, Blackbody
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DT 1001-LN, DT 1001-RS, DT 1001, DT 1001-LT specifications

The Exergen DT 1001 series, consisting of the DT 1001-LN, DT 1001, DT 1001-RS, and DT 1001-LT, represents a cutting-edge advancement in non-invasive infrared thermometry technology. These models are designed for accurate and reliable temperature measurement across various settings, making them invaluable tools for healthcare professionals, educators, and individuals monitoring their own health.

A standout feature of the Exergen DT 1001 series is its precision in measuring core body temperature. Utilizing patented infrared technology, these devices detect the thermal radiation emitted by the temporal artery, thus providing an accurate representation of internal body temperature. This non-invasive method is not only safe but also quick, as it can yield results within seconds, making it ideal for both clinical environments and home use.

The DT 1001 series emphasizes ease of use. Equipped with a simple one-button operation, even individuals without technical training can operate the device effectively. The easy-to-read digital display provides clear temperature readings, which can often be coupled with visual and auditory alerts for fever detection, enhancing user experience.

Further enhancing user convenience is the memory function of the DT 1001 series. These models can store multiple readings, allowing users to track temperature trends over time. This feature is particularly useful in monitoring patients with fevers or chronic health issues where regular temperature checks are necessary.

The DT 1001-LN and DT 1001-LT are distinguished by their lightweight and portable design, making them suitable for on-the-go temperature checks. Conversely, the DT 1001-RS is optimized for clinical settings, featuring enhanced durability and robust performance under frequent usage.

Each model has been rigorously validated to meet clinical standards, ensuring that healthcare practitioners can rely on their accuracy. With their advanced technology, user-friendly design, and versatility, the Exergen DT 1001 series stands out as a leading choice in the realm of non-contact thermometers, promoting effective health monitoring for a wide range of users. Their continued popularity highlights a significant trend in modern healthcare towards efficient, precise, and non-invasive diagnostic tools.
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