Work

Two-layer calorimeter with thermally insulating separator for measuring ultrasonic power

Year: 2025

Type: article

Abstract: The uncertainty in ultrasonic power measurement via calorimetry for high-power ultrasound is known to be larger than that via the radiation force balance (RFB) method. In order to achieve low uncertainty, we developed a two-layer calorimeter with a thermally insulating sheet to reduce the effect of heat generation by the ultrasonic transducer, which is a large factor in calorimetric uncertainty. The effect of the thickness of the separating sheet on ultrasound propagation and heat transfer was evaluated via simulations. A two-layer calorimeter with a 0.1-mm-thick thermally insulating sheet exhibited results close to those obtained via the RFB which is the most accurate method between 10 W–20 W. Also, we successfully measured ultrasonic power up to 100 W with this calorimeter. The results revealed that the two-layer calorimeter successfully suppressed the effect of heat generated by ultrasound transducers. This may lead to a reduction of the uncertainty in calorimetry.

Source: Japanese Journal of Applied Physics

DOI: 10.35848/1347-4065/adb855

Authors: Choyu Uehara, Takeyoshi Uchida

Institutions: Shimane University Hospital, National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology

Language: English

Topic: Scientific Measurement and Uncertainty Evaluation

Subfield: Statistics, Probability and Uncertainty

Field: Decision Sciences

Domain: Social Sciences

Open Access status: bronze

Funders: National Institute of Advanced Industrial Science and Technology, Japan Society for the Promotion of Science

Award: 気泡の発生音による気泡の膨張収縮の運動状態の定量計測技術