Aiming at the dynamic change process of the state of large composite components and the requirements of multispectral imaging detection,a design method of broadband large dynamic range ultrasonic amplification circuit without gain adjustment was proposed,and an ultrasonic signal amplification circuit without gain adjustment was designed,of which the bandwidth is 10 kHz-1.25 MHz and the gain is greater than 120 dB.A multi-stage amplifier was used to amplify the signal,segment the threshold control and identify&record the signal state.Finally,through the data synthesis,the ultrasonic emission signal and the echo signal were amplified in a large dynamic and broadband range.The simulation results show that the circuit can meet the requirements of the signal amplification and multi-spectral imaging detection during the state variation of large composite components.The circuit design method can also be applied to other fields such as shock wave test and acoustic measurement.
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