Many thermal imaging applications stand to gain from the inclusion of multispectral capabilities in the long wave infrared (LWIR). While infrared spectral imaging systems presently exist, the addition of multispectral capabilities will provide a number of advantages, including the ability to accurately quantify the temperature distribution a scene, and the potential for dramatically improved ta...

Because of the dependence of the Sun's irradiance on solar activity, reductions from contemporary levels are expected during the seventeenth century Maunder Minimum. New reconstructions of spectral irradiance are developed since 1600 with absolute scales traceable to spacebased observations. The long-term variations track the envelope of group sunspot numbers and have amplitudes consistent with...

We want to clarify a few issues about using optical absorption spectra for characterizing carbon nanotubes. The common method of using optical density for nanotube counting is reasonable in the nearinfrared and visible spectral region, but fails for the mid and far infrared, where metallic tubes can be unambigously detected. By performing Kramers–Kronig transformation on wide-range transmittanc...

Experimental data on the spectral emittance of particulate minerals, obtained using a Michelson interferometer operating between 300 cm(-1) and 1400 cm(-1) are compared with the results of a new theory of the spectral reflectance (emittance) of such materials. The comparisons show that the theory predicts the infrared spectra of minerals quite well both for single substances and mixtures, over ...

Aluminum nitride (AlN) film coatings have been obtained by a new technique of hybrid helikon-arc ion-plasma deposition. Possibility to combine the magnetic-filtered arc plasma deposition technique with a treatment in RF plasma of helicon discharge allowed us to deposit AlN coatings on thermolabile substrates, significantly increasing the deposition rate. A study of spectral properties of AlN fi...

Some new 3d-series transition metal complexes of types ML{M=Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)} and M’2L3 {M’=Cr(III) and Fe(III)} with dithiocarbamate ligand derived from 2,6-diacetyl pyridine have been prepared by the replacement reaction method. These complexes have been characterized by elemental analysis, conductivity measurements and infrared spectral studies. All the complexes wer...

Abstract We discuss the structure of the dressed fermion propagator in unquenched QED3 based on spectral function of photon.In this approximation infrared divergences that appeared in quenched case turns out to be soft.The dimension full coupling constant naturally appears as an infrared mass scale in this case.We find the reliable results for the effects of vacuum polarization for the dressed ...

We present a system for molecular spectroscopy using a broadband mid-infrared laser with near-infrared detection. Difference frequency generation of a Yb:fiber femtosecond laser produced a mid-infrared (MIR) source tunable from 2100–3700 cm−1 (2.7–4.7 μm) with average power up to 40 mW. The MIR spectrum was upconverted to near-infrared wavelengths for broadband detection using a two-dimensional...

Evidence is presented that 2MASS J03202839−0446358, a late-type dwarf with discrepant optical (M8:) and near-infrared (L1) spectral types, is an as-yet unresolved stellar/brown dwarf binary with late-type M dwarf and T dwarf components. This conclusion is based on low-resolution, near-infrared spectroscopy that reveals a subtle but distinctive absorption feature at 1.6 μm. The feature, which is...