Feasible Study on Temperature Sensing in Firing Field using Acoustic Tomography

Abstract

In order to apply acoustic tomography to temperature measurement in fire fields containing flames, we proposed a new method of analyzing signal waveforms and investigated its practicality by measuring the area where flame exists. The changes in pressure and chemical species predicted in the fire field and their effects in the presence of solid obstacles were also investigated. Measurements of the area where the flame exists showed that the difference from the theoretical value was less than 10 µs. The only effect on the signal waveform was an attenuation of the signal intensity, which was the same for all conditions considered. The measurement limit inferred from the attenuation of the signal intensity was a space occupancy of 99% or more, indicating the possibility of temperature measurement even if most of the space is filled with solid particles, as long as there is a space where sound waves can pass through.