METHOD AND VIBROPROBE FOR DETECTION AND IDENTIFICATION OF NONUNIFORMITIES IN SURFACE LAYER OF GROUND Russian patent published in 2006 - IPC G01V1/155 

FIELD: measurement engineering.

SUBSTANCE: method and vibroprobe can be used for detecting hidden masses or objects as well as for search of non-uniformities being disposed close to surface, for example, non-metal and metal objects (bricks, pipes, artificial fillings) in ground at small depth (till 0,3 m) as well as parts of ground with damaged or changed density. For the method the test signal generator, vibration source, measurement system and recognition system are used. Test signal generator form wideband signal with preset band pass. Measurement system defines oscillations of vibration source. Presence of non-uniformity is determined not by changes in signal reflected from the non-uniformity but by changes in vibration source oscillation amplitude depending on frequency of signal applied to the source. Resonant frequency of vibration source oscillations is defined by several factors, including density and elasticity of ground under the source. Presence of non-uniformity in ground changes its physical and mechanical properties which results in changes in resonant frequency of vibration source. Method is realized by means of vibroprobe which has test signal generator, power amplifier, vibration source, seismic receiver, and seismic receiver spectral analysis device and recognition system.

EFFECT: improved precision.

3 cl, 8 dwg