초록 ▼

Apparatus and method are provided for the location of pipeline damage and medium leak therefrom by acoustical monitoring of the soil about a pipe and recording emission noise by microphone and an amplifier which controls a peak noise indicator. Each measurement point detected by the amplifier is app

Apparatus and method are provided for the location of pipeline damage and medium leak therefrom by acoustical monitoring of the soil about a pipe and recording emission noise by microphone and an amplifier which controls a peak noise indicator. Each measurement point detected by the amplifier is applied to a digital memory to display a histogram showing noise distribution along the pipe. The main frequency of the loudest measurement point is determined, and an octave filter is utilized to determine the frequency characterizing medium leakage to precisely locate the pipeline damage. Bar diagrams may be provided on a viewplate by bands of parallel arrays of light emitting diodes to display noise distribution along the pipeline. A frequency analyzer may transmit from the amplifier to the memory the peak frequency value of each observed frequency band to enable frequency analysis of the loudest measurement point. The apparatus may have a case with a lid defining openings sized for viewing the bar diagrams.

대표청구항 ▼

A method of pipeline damage and fluid leak location by acoustical monitoring of the soil surrounding a defective pipe and recording emission noise by at least one microphone means connected with the input of an amplifier means, said method comprising the steps of: applying noise signals received by

A method of pipeline damage and fluid leak location by acoustical monitoring of the soil surrounding a defective pipe and recording emission noise by at least one microphone means connected with the input of an amplifier means, said method comprising the steps of: applying noise signals received by the microphone means over a broad acoustic frequency band at a plurality of regularly spaced intervals through the amplifier to a digital signal memory such that a histogram indicating the noise distribution along the length of the pipe at each of the intervals may be retrieved and displayed, comparing the frequency content of at least one of the highest peak noise intervals on the histogram with a preferred frequency indicative of the fluid leak such that the interval containing the highest intensity of noise at the preferred frequency may be identified, and as necessary, rerecording the noise signals at closer spaced intervals into the digital signal memory through a relatively narrow bandpass audio filter containing the preferred frequency such that an additional histogram may be displayed at the closer intervals to precisely locate the pipeline damage.