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| Study of Hydrophone Calibration Method Based on Spatial Average Effect Correction |
| LU Zong-rui1,QIAN Fei-ming2,XING Guang-zhen3,CHEN Yang4,YANG Bo1 |
1. College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029,China;
2. College of Instrument Science and Engineering, Harbin Institute of Technology, Harbin,Heilongjiang 150006,China;
3. National Institute of Metrology, Beijing 100029,China;
4. College of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou,Guangdong 510000, China |
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Abstract The hydrophone is a quantitative detection standard in medical ultrasound, and the accurate measurement of its sensitivity is the fundamental for the measurement of sound field parameters and a key link to ensure the safety and effectiveness of ultrasound diagnostic, physical therapy and treatment equipment. In order to solve the problem of increasing sensitivity error caused by the spatial averaging effect of hydrophones, A calibration method based on the spatial averaging effect correction is proposed when using the comparison method to calibrate the hydrophones. Firstly, the sound field is scanned under the pulse wave to obtain the sound beam width at each frequency point, and then the spatially averaged correction model is modeled with the effective diameter of the hydrophone, finally the correction model is introduced. By comparing the experimental results with those before correction, the average relative error is reduced by 4.1% after correction, and the measurement uncertainty is 1.3dB (k=2), and the experimental results verified the effectiveness of the method.
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Received: 04 August 2022
Published: 27 December 2023
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2023, Vol. 44 
