Temperature Distribution Monitoring Using Ultrasonic Thermometry Based on Markov Radial Basis Function Approximation and Singular Values Decomposition

Abstract

Information about temperature distribution is complex but of critical importance for the control of various microwave applications. In this paper, an innovative way of temperature distribution monitoring using ultrasonic thermometry in microwave field is investigated. The principle of ultrasonic thermometry in the situation of ideal gas is elaborated, and reconstruction algorithm based on Markov radial basis function approximation and singular values decomposition is presented and described in detail. In order to validate the performance of temperature distribution reconstruction of our presented algorithm, four two-dimensional temperature distribution models with different complexities are utilized in simulation experiments. Especially, simulation experiments taking error of measurement into account are studied to verify the robustness. Figure profiles show remarkable correspondence between the reconstructed ones and their models, while quantitative analysis, including the overall temperature error analysis and the hotspot positioning analysis, shows that different kinds of errors calculated are all within the limit ranges. In addition, the time analysis of simulation experiments also demonstrates its well real-time capability.

Temperature monitoring based on image processing for intelligent microwave heating

“…Infrared radiation thermometer is expensive; and optical thermometer can only measure local temperature values of a few points, can't detect the overall temperature field. We also carried out some research [6] about ultrasonic thermometry, it's an innovative way of temperature distribution reconstruction in microwave field by using Markov radial basis function approximation and singular values decomposition. Ultrasonic thermometry have a good effect in the situation of ideal gas, but it works bad in the situation of solid and it is difficult to securely install ultrasound temperature measuring device in the microwave source.…”

“…The basic idea of ultrasonic thermometry is that the sound has different propagation speeds at different temperatures [6] .This method is simple in principle and has a wide measurement range. In a gas liquid medium, it works well, while in a solid medium, the effect is not ideal.…”

Supportive Noninvasive Tool for the Diagnosis of Breast Cancer Using a Thermographic Camera as Sensor

“…Temperature is an important physical feature whose measurement is commonly used for fault or disease detection in industrial and medical fields. There are multiple techniques used for heat measurement, which include the use of sensors such as thermocouples to analyze stress in diesel motors [12] and to observe the behavior of a tooth exposed to different LED lights [13]; RTD (resistance temperature detector) is applied to support the process realized in solar dryers [14] or in distillation [15], as well as in civil engineering to monitor high temperature environments [16]; pyrometers are used for the control of temperature in spark plasma sintering [17]; coming to implement ultrasonic [18,19] and optical measuring techniques [20] to complement industrial processes in a non-intrusive way. Infrared (IR) sensing is a technology whose importance has grown in the last few years in multiple applications.…”

The Application of MPC in Microwave Heating Process Based on Model Constructed by Lambert’s Law Combined with Temperature

“…Another way to detect temperature is by ultrasonic sensors, which can obtain the temperature field in the heating material. But there are some problems unsolved to be applied in practical applications [8]. Because of the incomplete temperature field, the exact microwave distribution is basically unknown during the heating process.…”