Broadband Sub-terahertz Camera Based on Photothermal Conversion and IR Thermography

Capability of THz for Thermo-transmittance/water content measurements of insulating materials: heat and mass transfer

“…The detector consists of InSb quantum detector-based infrared camera (FLIR SC7000) with a spectral band of 3.5 µm -5.15 µm and acquisition frequencies up to 1 kHz and THz-to-thermal converter that is placed at the camera focal plane. The TTC consists of a carbon film absorbs THz radiation which leads to a thermal diffusion detected by infrared camera [17].…”

“…A wave-form generator (Agilent 33500B Series) was used to synchronize the THz source ignition and the CCD acquisition [17]. The synchronized signals represent the square signal ON/OFF phase of the THz source and square signal triggering the camera (figure 2).…”

“…However, the images of amplitude need further processing to decrease the present noise. Hence, in order to diminish the noise that could be incoming from the infrared camera and temperature fluctuations, Singular Value Decomposition (SVD) was applied [17].…”

Ultra-broadband contactless imaging power meter

“…From all of these seminal works, it was demonstrated that both The heat absorption depends on the wavelength. For example, 111 the absorbance is 100% in the NIR to far-IR range and only 112 61% in the millimeter range [9]. Heating the film increases its…”

“…In their work, Balageas et al reported a hyperspectral sensor using a very thin and homogeneous carbon film called a hyperspectral thermoconverter. This device has the ability to absorb radiation over a very wide spectral range (from visible to radio waves) with different sensitivities (depending on the wavelength) [5,9]. Electromagnetic waves are absorbed by the carbon film and converted into heat, which is transported by conduction in the thin film before being re-emitted as infrared (IR) light.…”