BVM-02 Borehole Vector Magnetometer
The BVM-02 contains a high sensitivity three-component fluxgate magnetometer and two-axis tiltmeter to provide measurements used in vector magnetic and borehole orientation surveys. The sensors are mounted in a non-magnetic housing, which is pressure rated to 1500 (40mm) or 3000 meters (42mm). All functions within the probe are controlled by an on-board microprocessor, that samples each sensor twice every second, and transmits the digital data record up-hole along the four conductors logging cable to the BIN-04 digital data interface. Power and a return ground provided to the probe through 2 of the cable conductors.
Each component of the magnetic field is sampled over 0.4 seconds to a sensitivity of 0.1nT. The 2-axis tiltmeter provides an accurate value of the borehole dip from 0 (vertical) to 80o.
Its 40-mm outer diameter permits use of the BVM-02 in small hole drilling programs typical in the mining industry. A complete copy of all measurements is recorded that permits further analysis in area of high magnetic gradient, which are often associated with mineralization.
PROBE SPECIFICATIONS | |
Magnetometer |
Range: +/-100,000nT Sensitivity 0.1nT Measuring time [0.5 sec.] |
TILTMETER |
Range: 0 to 85 Sensitivity [0.1] |
COMPUTED DIP | 0 to 90o from vertical |
COMPUTED AZIMUTH | 0 to 359o |
HOUSING | High strength filawound tube |
MAXIMUM DEPTH |
1500 meters for 40mm housing 3000 meters for 42mm housing |
CONNECTION | 4 pin connector (Gearhardt Owen ) |
TEMPERATURE RANGE |
Storage: -35oC to 70oC Operating: 0oC to 70oC Extended: 0oC to 125oC |
SAMPLING RATE | 2 Hz |
OUTPUT | 10mA current loop, 4800 baud |
SUPPLY VOLTAGE | 24 VDC @ 5W (at probe header) |
DIMENSIONS | 40 mm diameter x 1.4 meters long |
WEIGHT | 2.8 kg |