Temperature measurement of molten glass under batch feeding process by means of electrical resistance tomography

Electrical Resistance Tomography stands out as a powerful tool applicable to opaque environments, particularly in scenarios involving highly contaminated flows, gas-liquid two-phase flows with elevated void fractions, and electrically-conductive fields. The semi-conductive nature of high-temperature molten glass renders resistance tomography suitable for determining temperature distributions within such optically opaque mediums. This study aims to extend the application of the tomography technique to the spatial measurement of temperature in high-temperature molten glass. In order to verify the effectiveness of the developed system, a preliminary test was conducted by using an electrolyte solution in water to explore the overall system capabilities. Following the confirmation of the effective resolution of the proposed system, the measurement apparatus was employed for the actual temperature measurement of molten glass. The developed equipment featured sixteen independent electrodes, a low-impedance multiplexer, amplifier, rectifier, and a oscillating signal generator. Electrical potentials of the electrodes were recorded using a high-impedance amplifier as well as a data logging system. Upon collecting the electrical potential dataset, reconstruction computations were executed using the software. The measurement results show that the developed measurement system facilitates the acquisition of quantitative temperature distributions, as evidenced by the injection of a batch of low-temperature glass beads.