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多普勒效应测量海底甲烷气泡流速,需要一种能发射稳定频率的正弦波且频率可调的超声波发生电路。采用光电耦合实现信号源与驱动电路隔离,两路驱动信号死区时间可控;并采用悬浮电源D类谐振式电路实现频率高达1MHz正弦波信号的功率放大。测试结果表明,该电路可驱动功率为10~50W的超声波换能器,功耗小、频率稳定、波形误差小。
Doppler Effect Measuring the velocity of the bubble at the seafloor requires a sinusoidal, frequency-tunable ultrasonic generator that emits a steady frequency. The signal source and the driving circuit are isolated by the photoelectric coupling, and the dead time of the two driving signals is controllable; and the D-type resonant circuit of the floating power supply is used to realize the power amplification of the sine wave signal with the frequency of up to 1MHz. The test results show that the circuit can drive ultrasonic transducer with power of 10 ~ 50W, low power consumption, stable frequency and small waveform error.