Accurate temperature control of a ultrasonic cell using a microcontroller

In this paper we present the description of the realization of an electronic system and ultrasonic cell. The electronic system allows the control of cell temperature. This device is a compact system, less expensive and constructed around a microcontroller ST6225. The ultrasonic cell was designed and realized to measure with high precision the time of flight in the agroalimentary liquids between -10 /spl deg/C and + 150 /spl deg/C, it is associated to a device system realized by our team. The combinations of the automatic algorithms were used to obtain a precision on the temperature measurement of 0.1 /spl deg/C. The display and The processing of the results were carried out using the microcontroller and an acquisition card connected to the computer. For that we developed a data-processing application using the LABVIEW. We study the performances of our system following several factors and constraints. We present simulations of the temperature change and we compare the results with those of commercial devices of temperature. We also present acoustic velocity measurements of the agroalimentary liquids using the device.