Gain control circuit based on ultrasonic flaw detection

The utility model belongs to the technical field of ultrasonic flaw detection, and particularly relates to a gain control circuit based on ultrasonic flaw detection, which comprises an ultrasonic transmitting unit, a voltage generating unit, a primary filtering and amplifying unit and a secondary gain compensating unit, the ultrasonic transmitting unit is electrically connected with the voltage generating unit and the first-stage filtering and amplifying unit. And the voltage generation unit, the first-stage filter amplification unit and the second-stage gain compensation unit are in communication connection in sequence. The gain control circuit controls the voltage change through the ultrasonic transmitting unit, the voltage generating unit, the primary filtering and amplifying unit and the secondary gain compensation unit to realize gain compensation, so that the gain control on the flaw detector is very accurate, and the use is convenient. 本实用新型属于超声波探伤技术领域，尤其是涉及一种基于超声波探伤的增益控制电路，包括超声波发射单元、电压产生单元、一级滤波放大单元和二级