VIBROACOUSTIC ELONGATED OBJECT CHARACTERISTICS MONITORING DEVICE Russian patent published in 2006 - IPC E21B47/00 G01H9/00 

FIELD: survey of boreholes or wells.

SUBSTANCE: device comprises laser, input unit to input optical radiation in sensing member; wavelength-division multiplex unit, filter, optical isolator, optical modulator and outlet directed beam splitter. Laser is connected with wavelength-division multiplex unit. Outlet directed beam splitter is connected to the input device. Optical isolator and outlet directed fiber-optic beam splitter are linked to optical modulator and constitute united loop, which forms continuously operated narrow-band laser. The continuously operated narrow-band laser is connected with wavelength-division multiplex unit. Outlet directed beam splitter is connected to the input unit. Photodetector is linked to analog-digital converter and with the input unit. The analog-digital converter is connected in series with buffer memory included in signal processing unit linked to processor. Timing means is attached to optical modulator, analog-digital converter and buffer memory.

EFFECT: increased sensitivity and responsiveness, increased operating sensor length and spatial resolution.

4 cl, 1 dwg