Parametric Optimization of the Particle Temperature Distribution of the Gas-Thermal Flux by the Means of Thermal Radiation Spectrum of Particles

This paper discusses the application of a method for measuring the distributed temperature parameter of particles based on the solution of the inverse problem that uses the experimentally recorded integral thermal radiation spectrum of heterogeneous gas-thermal flux particles. The output signal that registers the thermal radiation spectrum of particles is measured by a linear multi-element photodetector. The measuring equation for the output signal is presented as a Fredholm equation of the first kind with a temperature density distribution function and the Plank function. A brief derivation of the inverse operator is provided for the solution of the inverse problem of determination of particle temperature distribution. Integral spectrum functions of thermal radiation of particles are derived for two model functions of particle temperature distribution. Parameters of these two model functions are optimized using the least-squares method and the experimentally obtained integral thermal radiation spectrum.

Quantum radiation of Maxwell’s electromagnetic field in nonstationary Kerr–de Sitter black hole

Quantum radiation properties of nonstationary Kerr–de Sitter (KdS) black hole is investigated using the method of generalized tortoise coordinate transformation. The locations of horizons and the temperature of the thermal radiation as well as the maximum energy of the nonthermal radiation are derived. It is found that the surface gravity and the Hawking temperature depend on both time and different angles. An extra coupling effect is obtained in the thermal radiation spectrum of Maxwell’s electromagnetic field equations which is absent in the thermal radiation spectrum of scalar particles. Further, the chemical potential derived from the thermal radiation spectrum of scalar particle has been found to be equal to the highest energy of the negative energy state of the scalar particle in the nonthermal radiation for KdS black hole. It is also shown that the generalized tortoise coordinate transformation produces a constant term in the expression of the surface gravity and Hawking temperature.

Effect of Electrical Field Resonances due to Perturbation Slit Tunnel Junction for a Potential Solar Energy Collector at 10 Micrometer Radiation

A potential solar energy collector is proposed. The design is a new rectangular antenna with perturbation slit tunnel junction that exhibits highly confined electrical-field at 10 micrometer radiation. The configuration operates at the centre resonant for thermal radiation spectrum. The vital idea behind this proposed design is to trap and guide out the electrical-field using slit tunnel into a convenient location for potential solar energy collector. The trapping electrical field achieved is enhanced up to 110 V/m with an excitation plane wave of 1 V/m. Meanwhile, a wider half-field strength bandwidth up to 13.5 THz is successfully excited to cover most of the thermal radiation spectrum. By the introduction of a tunnel junction of 0.1 micrometer for diode integration, the electrical field magnitude slightly decreased to 98.3 V/m with half-field strength bandwidth of 12 THz. Furthermore, the promising results generated by finite integration technique (FIT) method offers the proposed design to be a potential candidate for energy harvesting devices at 10 micrometer thermal radiation of the sun.