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针对目前地下油气管道探测仪由于高采样率、高精度而造成功耗大的问题,引入一种混频幅值算法,使得探测仪接收机能够在远低于2倍发射频率的情况下完成采样并进行相应的地下油气管道埋深的计算。根据地下管道探测仪工作原理,被测信号为等幅正弦信号,将其与方波信号通过乘法器混合得到混频信号,再通过低通滤波回路得到频率更低的信号,其频率为方波信号与正弦波信号的频率差值。接收机采集该低频信号,并计算被测信号的强度幅值即可确定油气管道的埋深。经试验证明,当管道埋深在2 m以内时,用该方法探测油气管道深度的相对误差在±2%内,且接收机测得的感应电压幅值稳定可靠,能够满足地下油气管道探测的要求,同时还降低了功耗和成本,大幅提高了地下油气管道探测仪的性价比。
Aiming at the problem of large power consumption due to high sampling rate and high precision of current underground oil and gas pipelines detector, a mixing amplitude algorithm is introduced, which enables the receiver of the detector to finish sampling well below the transmitting frequency of 2 times And calculate the corresponding underground oil and gas pipeline depth. According to the underground pipeline detector working principle, the measured signal is equal amplitude sinusoidal signal, mixed with the square wave signal through a multiplier to obtain a mixed signal, and then through the low-pass filter loop to get a lower frequency signal whose frequency is a square wave Frequency difference between the signal and the sine wave signal. Receiver to collect the low-frequency signal, and calculate the amplitude of the signal under test to determine the buried depth of oil and gas pipelines. Proved by experiments, when the buried depth of the pipeline is less than 2 m, the relative error of detecting the depth of the oil-gas pipeline by this method is within ± 2%, and the amplitude of the induced voltage measured by the receiver is stable and reliable, which can meet the needs of underground oil and gas pipeline exploration Requirements, while also reducing power consumption and cost, significantly improve the cost of underground oil and gas pipeline detector.