介绍了时间增益补偿的工作原理，同时提出了方差补偿、阈值补偿、余差补偿三种不同的校正方法;采用此三种方法进行成像显示对比试验,以补偿因声波信号衰减和能量传输引起的增益变化，从而改善相控阵的成像效果。结果表明，在超声相控阵检测中，三种补偿方法均能有效提高缺陷的检测率和分辨率，可增强检测人员对被测件内部缺陷判别的可靠性。

This paper introduces the working principle of time gain compensation and three different algorithms to realize time gain compensation, variance compensation, threshold compensation and residual compensation, which can compensate for changes of the gain due to signal attenuation and the energy transmission, so as to improve imaging effect of phased array. It was proved that these three kinds of compensation methods were effective to improve the defect detection rate and image resolution. Accordingly, the time gain compensation makes the detection of internal defects more reliable for inspectors.