Temperature detection circuit system research based on ultrasonic phase difference method

A set of temperature measuring system hardware circuits is presented and investigated regarding to static errors. The measurement accuracy of the system can be up to 1%in the industrial applications. In addition, this paper proposes a recommending method to select hardware equipment and this approach plays an important role in temperature measurement in industrial applications. Ultrasonic measuring method is used in non-intrusive measurement for temperature field with simple installation, non-contact measurement, low cost and high precision[1].At present, in boiler application, the temperature error is worse to 5% [2], which can be reduced to about 3% caused by the hardware configuration improved. This paper proposes an ultrasonic temperature measuring method of small error and low cost, which greatly reduces the cost and further improves accuracy.