text: The use of optoelectronics tells us that previous optoelectronic structures were used to check the thermal efficiency of certain materials that were composite and inserted into the detection unit as a liner. This technique depends on the coupled fluid thickness scanning process (TWRC method). Two special composites were chosen for this study: (I) Liquid: Nanofluid based on water and containing gold nanoparticles (ii) More solid type: Urea - Fumaric acid eutectic in a ratio of 1:1. It has been found that the thermal effusivity is independent upon the volume and concentration in the gold particles. Considering the eutectic characterized by urea-fumaric acid, it can be reasonably concluded that the value of the heat permeable compound is quite different from that of the pure raw material. This illustrates the production of compounds.
  Self-consistence photopyroelectric calorimetry for liquids
  This photopyroelectric also demonstrate that the front photopyroelectric (FPPE)structure is also important. In addition, it clearly explains the Thermal Wave Resonator Cavity (TWRC) method, which is designed to check the thermal mobility and diffusivity of liquids. It has demonstrated that the same type of technology is capable of producing a variety of static and dynamic thermal parameters. In addition, two of these parameters are checked and calculated in a straightforward manner, while the other two are still calculated indirectly. This method shows the principle of sustainability in that it studies certain liquids such as various oils, water, glycerin, ethylene glycol and the like.