The new laser heterodyne method: the establishment of high – frequency hydrophone calibration installation

Recently learned from the China Institute of Metrology, the Institute in the international first use of new laser heterodyne method to set up high-frequency hydrophone calibration installation sheet metal punch, the frequency of China’s high-frequency ultrasound measurement of the upper limit from the existing 5MHz to 60MHz, Ultrasonic diagnosis and treatment, detection of higher supply of more accurate calibration source. People are accustomed to the general frequency of more than 20kHz sound waves called ultrasound, ultrasound because of its good point, penetrating power is strong, easy to get more concentrated sound energy, foreign trade clerk is widely used in medical diagnosis, treatment and industrial testing . High-frequency hydrophone is the most important component in influencing the safety evaluation and performance evaluation of ultrasonic diagnostic facilities.

 

High-frequency hydrophone is a kind of high-frequency sensor that can hear the sound in the water, can receive the ultrasonic signal in the water and transform it into electric signal. High frequency hydrophone accurate or not, to protect the security of ultrasound diagnostic facilities busbar bending cutting punching machine, ultrasound treatment facilities angle drill machine, the accuracy of the dose is essential. China Institute of Metrology started in 2009 in the study, the research group using reciprocal technology and laser heterodyne craft two ways to set up a high-frequency hydrophone calibration installation, which up to 60MHz laser heterodyne calibration power Internationally for the first time steel punch press. According to the project leader, deputy director of the China Institute of Metrology, Yang Ping, deputy director of the introduction, the group controlled laser heterodyne technology to carry out high-frequency hydrophone calibration power, frequency range 5MHz ~ 60MHz, measurement uncertainty is better than 16% (K = 2), calibration frequency range and degree of uncertainty into the international first echelon.

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