Influence of KMnO4 Concentration on Infrared Emissivity of Coatings

On TC4 Alloys by Micro-Arc Oxidation (Materials EISSN 1996-1944)

Abstract:

Fig 8. Infrared emissivity curves of the MAO ceramic coatings with different KMnO4 concentrations within a waveband of 5–20 μm.[/caption]

Ceramic coatings with high emissivity were fabricated on TC4 alloys by micro-arc oxidation technique (MAO) in mixed silicate and phosphate electrolytes with varying KMnO₄ addition.

The microstructure, phase and chemical composition were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), and the infrared emissivity of the MAO coatings was measured in a waveband of 5–20 μm.

The results show that the thickness of the coatings increased with the addition of KMnO₄, but the roughness of the coatings first decreased and then increased slightly due to the inhibitory effect of KMnO₄ on Na₂SiO₃ deposition.

Retrievals of the Far Infrared surface emissivity over the Greenland Plateau

Research Article

TITLE: "Retrievals of the Far Infrared surface emissivity over the Greenland Plateau using the Tropospheric Airborne Fourier Transform Spectrometer (TAFTS)."

(See Author List below)

ABSTRACT (Format Edited for easier online viewing)

The Tropospheric Airborne Fourier Transform Spectrometer (TAFTS) measured near surface upwelling and downwelling radiances within the far infrared (FIR) over Greenland during two flights in March 2015. Here we exploit observations from one of these flights to provide in-situ estimates of FIR surface emissivity, encompassing the range 80-535 cm-1.

Normal Spectral Emittance of Aluminum

"From FAR Associates-Al"

Reference: Thermophysical Properties of Matter, Vol. 7: Thermal Radiative Properties, Y.S. Touloukian and D.P. DeWitt, IFI/Plenum, New York, 1970. Copied from the FAR Associates webpage at: http://pyrometry.com/pyrometry-info/emissivity-selected-materials/

Improving Temperature Measurement of Low Emissivity Targets

Helpful Tips for Users From FLIR

Meer, Belgium -- FLIR Systems has published a new technical note that investigates and describes how to use low-cost materials to increase target emissivity to enable accurate measurement using a thermal imaging camera.

Clean, unoxidized, bare metal surfaces such as are found in many R&D applications have low emissivity. Consequently they are difficult to analyse with a thermal imaging camera.

To get good accurate temperature measurements there is a consequent need to increase the emissivity of these problematic targets.

The technical note provides an informative introduction to emissivity and how a target's emissivity, reflectance and thermal conductivity values are highly dependent on material properties.

The authors describe several cost effective techniques to compensate for low emissivity based upon reducing the reflectance of the target enabling a significant improvement in measurement accuracy.

Further, a simple technique to facilitate fault finding on populated printed circuit boards (PCB) containing a variety of metal and plastic components using a thermal imaging camera is described.

For a copy of this new technical note please visit www.flir.com or contact FLIR Systems on +32-3665-5100 or research@flir.com.

Some additional downloads relating to Emissivity may be found on the FLIR Systems website, www.FLIR.com, by using the integral search engine and requesting the term "emissivity", "spectral emissivity*" or "emittance". Typical current results are shown at https://www.flir.com/discover/professional-tools/how-does-emissivity-affect-thermal-imaging/.

FLIR Systems, Inc. is a world leader in the design, manufacture, and marketing of sensor systems that enhance perception and awareness. FLIR's advanced thermal imaging and threat detection systems are used for a wide variety of imaging, thermography, and security applications, including airborne and ground-based surveillance, condition monitoring, research and development, manufacturing process control, search and rescue, drug interdiction, navigation, transportation safety, border and maritime patrol, environmental monitoring, and chemical, biological, radiological, nuclear, and explosives (CBRNE) detection.

For more information, go to FLIR's web site at www.FLIR.com.

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Source: The original news release for this article was published on on 10 October  2015, submitted by Primetek Solutions (www.primetek-solutions.com)

ICRAF/ISRIC spectral library

A Globally Distributed Soil Spectral Library:

Visible Near Infrared Diffuse Reflectance Spectra

According to The Africa Soil Information Service (AfSIS http://africasoils.net/)