一种新型的精密超声波温度计设计(英文)

A Kind of Precise Ultrasonic Thermometer Design

在介质中超声波的传播速度会随着介质温度的变化而不同,根据超声波的这种特性设计出一种精密的温度计。利用超声波在不同介质的交界面上会发生反射的特性,将超声波温度传感器设计成反射结构,该结构能够有效减小温度计的大小。基于FPGA的硬件电路保证了对超声波回波信号数据采样的实时性。软件细分算法通过对采样数据的分析精确计算出超声波的传播时间。经分析,超声波温度计可以实现纳秒级的时间测量和分辨率为0.001℃的温度测量。这种新型的超声波温度计可以广泛应用于科研和工业生产。

The velocity of ultrasonic wave varies greatly due to the change of medium temperature. Based on this characteristic, a new kind of precise temperature thermometer is proposed. According to the feature that the ultrasonic wave will reflect on the interface between two different media, the ultrasonic temperature sensor is designed to be the reflective structure which can reduce the size of the sensor effectively. The hardware circuit based on FPGA guarantees the realtime data sampling of ultrasonic echo wave signal. The special software with subdivision algo- rithm is used to accurately calculate the ending time of ultrasonic transmission by analyzing the sampled data and to ensure the high-resolution measurement of the ultrasonic propagation time. The analysis results have shown that the designed ultrasonic thermometer could achieve nanosecond time measurement and the resolution of temperature measurement is no more than 0. 001℃. This new kind of ultrasonic thermometer can be widely used in industrial applications for precision temperature measurement.