Sihaya - geologický a geofyzikální průzkum

The development of geophysical instruments

in company SIHAYA Ltd. has three main streams:

seismograph SEISMUT 6

easy portable with 50 - 200 channels and with removable notebook (enables full interpretation of seismic reflection and refraction records immediately in terrain)

24 bits A/D sigma delta converters with sufficient dynamic range for shallow reflection and refraction prospections
automatical setting of geometry of measurement and addition - summation of seismic records, PPV ...
200 to 1 channel, input single-sideband filter 1-20000 Hz, 50 Hz digital filter
adjustable sampling interval (from 24 us to 10 ms) for one or up to 200 channels
optional length of record in saved format SEG2
optional sensibility of measurement (according to type of sensors)
trigger by circuit break or shortcutt

100 channel direct current resistivimetric instrument GEA 7

is easy portable direct-current 100 channel resistivimeter with removable notebook (enables full interpretation of VES, MEM (multielectrode measurements), ERT (electrical resistivity tomography) and resistivity profiling measurements immediately in terrain)
21 bits A/D converters, commutation of current
precision of measurement is 5 uV and 5 uA
with graphical presentation and record of charging and discharging current and potential curves for IP methods
with evaluation of discharging curve in selectable windows to apparent polarizabiolity parameter
support measurement by methods VES, MEM (multielectrode measurements), ERT (electrical resistivity tomography) and resistivity profiling measurements immediately in terrain and in IP variations as well
digital record in save format ASCII sheet-table *.GEF
possibility of using preset parameters for measuring VES, MEM and other resistivity and IP measurement profiling up to 100 electrodes (max.4 active electrodes in the same time)

direct current resistivimetric instrument GEA 6

is easy portable direct-current 4 channel resistivimeter with removable notebook (enables full interpretation of VES, SP and resistivity profiling measurements immediately in terrain)
21 bits A/D converters, commutation of current
precision of measurement is 5 uV and 5 uA
with graphical presentation and record of charging and discharging current and potential curves for IP methods
with evaluation of discharging curve in selectable windows to apparent polarizabiolity parameter
support measurement by methods VES, SP and resistivity profiling measurements immediately in terrain) and in IP variations as well
digital record in save format ASCII sheet-table *.GEF
possibility of using preset parameters for measuring VES, resistivity profilng and other resistivity and IP measurements up to 4 active electrodes

Output of instrument GEA 6 measurnig VES-IP: section according to VES-IP during measurement with GEA 6

older instruments line:

seismograph SEISMUT IV

easy portable with removable notebook (enables full interpretation of seismic records immediately in terrain)
24 bits A/D sigma delta converters with sufficient dynamic range for shallow reflection prospections
automatical setting of geometry of measurement and addition - summation of seismic records ...

seismograph SEISMUT III

easy portable with removable notebook (enables all interpretation in terrain)
16 bits A/D converters + 4 steps pregain 0 - 60 db, dynamic range 96 db
automatical setting of gain and geometry of measurement, addition -summation of seismic records ...
32 to 1 channel, input single-sideband filter 3-2500 Hz, 50 Hz digital filter
minimal sampling interval 9 ms for one channel to 300 ms for 32 channels
optional length of record in save format SG2
seismograph works reliably even on most difficult circumstances, (see the picture right)

GEA II - instrument for resistivity direct current measurements

is easy portable direct-current resistivity meter with removable notebook (enables full interpretation of VES and resistivity profiling measurements immediately in terrain)
21 bits A/D converters, commutation of current
precision of measurement is 5 uV and 5 uA
possibility of using preset parameters for measuring VES, resistivity profiling and SP...
digital record in save format sheet-table *.txt
presetable automatic modification of the geometry of measurement