Passive Acoustic Thermometry of the Chest of a Person with COVID-19

Abstract

Passive acoustic thermometry (PAT) was used to study the dynamics of changes in the chest temperature of a person with COVID-19 over the course of about two and a half weeks after quarantine. PAT, which can measure deep body temperature, showed that the integral temperature of tissues surrounding the lungs increased from 32.2 ± 0.07 to 33.0 ± 0.03°C about 10 days after the end of quarantine. This may indicate increased blood supply to the lungs, i.e., an indication of recovery. Infrared thermometry used to monitor recovery yielded no results.

Early Detection of Coal Spontaneous Combustion by Complex Acoustic Waves in a Concealed Fire Source

“…Following the acquisition of the TOF and the discretization of the temperature field for each path, an algebraic equation representing the relationship between temperature and TOF in the discrete grid is established, transforming the temperature field reconstruction problem into a problem of solving a system of equations. , The propagation velocity of sound waves in a gas medium is a function of the gas temperature. Assuming that gas composition and content are known, the relationship between the propagation velocity of sound waves and the temperature is as follows: − v = γ R T m = Z T where v is the speed of acoustic wave propagation in m/s ; γ is the ratio of constant pressure specific heat capacity to constant volume specific heat capacity of the gas medium and is related to gas composition; R is the gas constant, which is 8.314 J / (mol·K); T is the thermodynamic temperature in K ; m is the molecular weight of the gas in kg/mol; and Z is derived as follows: Z = γ R m where Z is a constant Z of 20.03 for the given gas. Kong et al used a constant Z of 19.98 for the flue gas.…”