Geomatrix Earth Science Ltd
20 Eden Way, Pages Industrial Park, Leighton Buzzard, Beds, LU7 4TZ, UK
Sales and Rentals of Geophysical Equipment
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The EM61HH Mk. 2, is a "hand-held" complement to the EM-61 Mk. 2, providing greater sensitivity to smaller targets at shallow depths. A single 20mm projectile can be detected to a depth of greater than 0.5 metres. Comparatively, a single 200 litre (55 gal.) drum can be detected to depths of greater than two metres. Data is collected from a single receiver at four time gates after transmitter turn-off. Information from four gates provides for the discrimination of targets based on the response decay rate; the early time data will detect both small and large targets with short and long decay rates respectively, while the late time data will detect only larger targets with relatively long response discrimination. An optional second receiver coil provides for the determination of "differential" data - to remove or reduce the effect of near-surface, non-target response - and an estimated depth to the target. GPS integration is available for either coil configuration. With a narrower spatial focus than the standard EM-61 Mk. 2, the EM-61HH Mk. 2 is relatively less sensitive to sources of potential interference. As a result, data can be collected in closer proximity to cultural features such as fences and buildings. Additionally, the narrower focus provides enhanced target resolution, and consequently improves discrimination of multiple targets. The EM-61HH Mk. 2 can be operated either with or without wheels. In either configuration, the smaller, more portable design offers improved access to areas of difficult terrain and dense vegetation. |
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Specifications
| Measured Quantities | Four time gates of secondary response in mV |
| EM Source | Air-cored coil, 17 cm diameter |
| Current Waveform | Uni-polar rectangular current with 25% duty cycle |
| EM Sensor |
Air-cored coil, 17 cm diameter |
| Measuring Ranges | 10,000 mV |
| Dynamic Range | 18 bits |
| Output Monitors | 16-line graphic LCD with 24 characters per line, and audio tone |
| Power Supply | 12 V rechargeable battery for 4 hour continuous use |
| Data Output | RS232 serial port |
| Data Storage | 330,000 data sets |
| Operating Weight & Dimensions | Back pack: 60 x 30 x 20 cm; 8 kg Sensor Assembly: 33 x 20 cm; 2.8 kg (7.5 kg with wheels) |
| Shipping Weight & Dimensions | 50kg 117 x 50 x 54 cm |