Design Of Micro Ultrasonic Guide Temperature Measurement

In all aspects of industrial production and daily life,the measurement of temperature occupies an important position.And in many cases,there is a very high requirement for the accuracy of temperature measurement.With the continuous development of science and technology,the requirements for temperature measuring devices are also getting higher and higher.However,the traditional temperature measuring devices still have many deficiencies.For example,It is so low detection accuracy and manually maintain the data that can not meet the industrial and Other areas of automation and intelligent requirements.To solve these problem,this project proposes a method of ultrasonic guide temperature measurement,and develops a miniature ultrasonic guide thermometer under high temperature environment.The developed prototype realizes real-time temperature measurement from 0 to 1800°C with a resolution of less than 2%.And to achieve the temperature measurement prototype miniaturization,portability,human-computer interaction convenient and beautiful requirements.In this paper,the principle of ultrasonic temperature measurement is studied theoretically.Combined with the required functions and characteristics of the project,the design scheme of the miniature ultrasonic guided thermometer is determined,including the temperature measurement hardware system and the SOPC system.Among them the hardware system includes FPGA module,system power circuit module,digital-to-analog conversion circuit,ultrasonic wave transmitting module and ultrasonic wave receiving module,which realizes the transmission and reception of ultrasonic waves,signal acquisition and storage.The SOPC system includes the development of Nios Ⅱ soft processor algorithms and human-computer interaction interface.The soft processor algorithms include noise removal algorithm,node wave and end-wave coordinate extraction algorithm,node wave and end-wave propagation delay algorithm,which realizes the ultrasonic echo Signal processing and calculation;Usart GPU serial touch screen is used to develop the human-computer interaction interface,and the system parameters of the thermometer are conveniently and accurately set,and the current measured temperature value,time delay difference and sound speed value are visually displayed.The experimental results show that the designed micro-ultrasonic guide thermometer can respond to changes in the external conditions of the sensor in real time,and the resolution below 1800°C is less than 2%.Enables measurement of temperatures up to 1800℃ with known temperature-delay relationship.