The invention belongs to the field of electronic circuits, and relates to an ultrasonic guided wave icing detection excitation circuit. Comprising a DDS digital synthesis circuit, a signal output circuit, a power amplification circuit and a transmitting/receiving transducer. The FPGA directly controls the DDS digital synthesis circuit to generate sine pulse digital signals modulated by a Hanning window, the digital signals are converted into voltage analog signals by the signal output circuit, and the voltage analog signals are amplified by the power amplification circuit to excite ultrasonic guided waves of the transmitting/receiving transducer. An FPGA chip is adopted to control a DDS chip AD9851 to generate sine waveforms with adjustable frequency and period, and sine wave signals and Hanning window signals are synthesized into Hanning window modulation sine signals required by ultrasonic guided wave excitation in a D/A converter DAC0832 through a DDS digital direct synthesis technology. Meanwhile, the power amplification circuit has the characteristic of adjustable gain, so that the frequency and the amplitude of the guided wave excitation signal are adjustable, and the optimal guided wave excitation waveform signal can be generated according to different conditions.
本发明属于电子电路领域,涉及一种超声导波结冰探测激励电路。包括:DDS数字合成电路、信号输出电路、功率放大电路、发射/接收换能器。由FPGA直接控制DDS数字合成电路产生经过汉宁窗调制的正弦脉冲数字信号,该数字信号由信号输出电路转换为电压模拟信号,最后经过功率放大电路放大后对发射/接收换能器进行激励超声超声导波。采用FPGA芯片控制DDS芯片AD9851产生频率、周期可调的正弦波形,再通过DDS数字直接合成技术在D/A转换器DAC0832中将正弦波信号和汉宁窗信号合成超声导波激励所需的汉宁窗调制正弦信号。同时,功率放大电路具有增益可调的特点,从而实现导波激励信号频率、幅值可调,可根据不同情况产生最佳导波激励波形信号。
Ultrasonic guided wave icing detection excitation circuit
一种超声导波结冰探测激励电路
2023-04-14
Patent
Electronic Resource
Chinese
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