Study on acoustic transducer with acoustic ducts in acoustic thermometry

被引：0

作者：

Gao, Jie ^{[1
,2
]}

Feng, Xiaojuan ^{[2
]}

Lin, Hong ^{[2
]}

Li, Xiaowei ^{[1
]}

Zhang, Jintao ^{[2
]}

机构：

[1] College of Physics Science and Technology, Hebei University, Baoding 071002, China

[2] Division of Thermophysics and Process Measurements, National Institute of Metrology, Beijing 100013, China

来源：

Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | 2014年 / 35卷 / 03期

关键词：

Cylinders (shapes) - Temperature - Acoustic transducers - Temperature measurement - Frequency response - Uncertainty analysis - Temperature sensors - Natural frequencies - Ducts;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

International temperature scale is an approximation of the thermodynamic temperature scale; accurate thermodynamic temperature measurements are the physical foundation to establish or revise the international temperature scale. There is a lack of accurate thermodynamic temperature measurements in the temperature range from 600-1 358 K, which is the uncovered region of contact thermometry and radiation thermometry, and is very difficult for both of them to perform the test. Acoustic thermometry is one of the most important thermodynamic temperature measurement methods with lowest uncertainty. However, traditional acoustic transducers can not operate at high temperature. It is needed to use high temperature alloy acoustic ducts to bring the acoustic signal into the operation environment of acoustic transducers and perform the acoustic resonance frequency measurement in the gas within a cavity. This is the most critical technique for high temperature thermodynamic temperature measurements with acoustic thermometry. In order to extend the operation temperature of the fixed-path-length cylinder acoustic thermometer to the range of 600-1 358 K, we investigated the influence of the acoustic transducer with acoustic ducts on the resonance frequency response characteristics of the fixed-path-length cylinder resonance cavity. With theoretical analysis and experimental measurement, the dimension of the acoustic ducts and the design form of the acoustic transducer suitable for the acoustic thermometer are obtained, which lays a foundation for the successive study on the measurements of thermodynamic temperature at high temperature.

引用

页码：627 / 633