Signal-to-Ratio (SNR) of leak signal is the main factor influencing on missing alarm and false alarm in pipeline leak detection. Traditional de-noising methods

such as wavelet transform and EMD decomposition

are hard to promise stable and effective signal enhancement because of the selection of wavelet base

decomposition scale or reconstruction components. Through analysis of the transfer function of dynamic pressure transducer

it is found that the integral part in the output signal of dynamic pressure transducer

which can reflect the low frequency response characteristics of acoustic signal

is missing. Therefore

a gain-adjustable acoustic signal enhancement method based on time-integration is proposed. The test results with field data show that the proposed method has better performance for the signal enhancement with precise location and no complex parameter optimization

and it also provides an effective technical support for small leak detection and decreasing of the missing and false alarm rate.