초록 ▼

The present invention provides a leakage detector enabling accurate and stable detection for occurrence and a position of leakage in a buried fluid pipe line and also making it possible for even those not so skilled in the leakage detection work to use the detector. The leakage detector 1 according

The present invention provides a leakage detector enabling accurate and stable detection for occurrence and a position of leakage in a buried fluid pipe line and also making it possible for even those not so skilled in the leakage detection work to use the detector. The leakage detector 1 according to the present invention comprises a vibration detector 2 having a pickup 6 incorporating a piezoelectric element; a main body 4 of the detector incorporating voltage amplifiers 31, 37 for voltage-amplifying an output signal and a plurality types of noise removing units 33, 34, 35 for removing noises from the output signal, and a headphone 5. The main body 4 of the detector has a display unit 15 for displaying data for detected vibration sounds on a predefined screen.

대표청구항 ▼

1. A leakage detector comprising: a vibration detector having a pickup incorporating a piezoelectric element;a main body of the leakage detector incorporating a voltage amplifier for voltage-amplifying an output signal and a plurality of types of noise removing units each for removing noises from th

1. A leakage detector comprising: a vibration detector having a pickup incorporating a piezoelectric element;a main body of the leakage detector incorporating a voltage amplifier for voltage-amplifying an output signal and a plurality of types of noise removing units each for removing noises from the output signal; anda headphone,wherein the plurality of types of noise removing units include a delayed noise removing unit and at least one type of noise removing unit from among a band pass filter and a comb filter, andwherein said delayed noise removing unit converts the output signal including leaking sounds and external noises mixed therein into a converted signal consisting of specific frequency components, compares powers of the frequency components included in the converted signal sampled at different time points respectively, selects a frequency component, from among the frequency components, having a smaller power throughout a bandwidth, and generates a signal from which noises have been removed based on the frequency components that are not selected. 2. The leakage detector according to claim 1, wherein the plurality of types of noise removing units can be combined with each other according to a necessity in use. 3. The leakage detector according to claim 1, wherein the plurality of types of noise removing units allows for change of conditions for detection. 4. The leakage detector according to claim 1, wherein the main body of the leakage detector has a display unit for displaying data for detected vibration sounds on a predefined screen. 5. The leakage detector according to claim 1, further comprising: a handle member for holding the vibration detector, wherein an audio switch is provided on the handle member. 6. The leakage detector according to claim 1, wherein the vibration detector has a noise absorbing member, which is a rubber block, mounted on a signal output cord. 7. The leakage detector of claim 6, wherein the rubber block, mounted on the signal output cord, comprises an insertion path having a substantially horse shoe-shaped form and a block diameter of the rubber block is substantially identical to a cord diameter of the signal output cord.