一种基于DDS的三频点标准超声功率源的设计

doi:10.3969/j.issn.1000-1158.2021.11.12

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Abstract Combining theoretical method research and specific hardware design, a three-frequency standard ultrasonic transducer based on LiNbO3 single crystal substrate is proposed. The DDS chip is controlled by a single-chip microcomputer to generate sinusoidal signals of three frequencies. After a high-frequency operational amplifier circuit, the standard ultrasonic transducer is excited to output standard ultrasonic power, thereby forming a three-frequency standard ultrasonic power source, which can be used as a standard for ultrasonic power transmission. The three-frequency standard ultrasonic power source realizes the output of 18.9MHz high-frequency ultrasonic waves. The results of comparison with the British NPL measurement show that the error of the ultrasonic power value at the three frequency points is not more than ±5%, which verifies the validity of the data output by the three-frequency point standard ultrasonic power source.

Key words： metrology ultrasonic power measurement standard ultrasonic transducer lithium niobate substrate DDS three-frequency ultrasonic power source

Received: 21 July 2020 Published: 01 December 2021

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TB95

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	Articles by authors
	CHEN Shen-li
	GUO Guang-jian
	LI Min-yi

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CHEN Shen-li,GUO Guang-jian,LI Min-yi. A Design of Three Frequency Standard Ultrasonic Power Source Based on DDS[J]. Acta Metrologica Sinica, 2021, 42(11): 1488-1493.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2021.11.12 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2021/V42/I11/1488

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