Sanborn’s TDEM System.
Helicopter Borne Time Domain EM System
Sanborn’s TDEM System is a versatile state-of-the-art time-domain helicopter-borne electromagnetic system well suited for mineral and groundwater exploration, geological mapping and environmental applications. Its small footprint and compact size allows the system to be deployed easily and assembled quickly for minimal set up and calibration time.
Benefits.
- Powerful compact transmitter
- Three component receiver (x,y,z)
- Lightweight and rigid frame
- Easy operation in rough terrain
- Easy helipad and hangar storage
- Easy assembly and installation
- Small loop footprint
- Improved spatial resolution
- Full wave-form recorded data
- User Selected Programmable windows
Key Figures.
1400 A Peak Current
325000 NIA Peak Dipole Moment
400 + m Estimated Depth Penetration
Technical Specification.
| Transmitter (Tx) | Rigid, Aluminum tubes |
| Tx Coil | Vertical axis |
| Tx Coil Diameter | 8.6m |
| Number of Turns | 4 |
| Pulse Shape | Half-sine |
| Pulse Length | Approx. 4ms for 25/30 Hz: 1.5ms for 75/90 Hz |
| Base Frequency | 25 or 30 Hz |
| Optional base frequency | 75 or 90 Hz |
| Peak Current | Up to 1,400 A |
| Peak Dipole moment | Up to 325,000 NIA |
| Estimated penetration | 400 + m |
| Power Supply | Independent on loop |
| System suspension | one tow rope, single point suspension |
| Tx elevation over ground | 30m |
| Rigid system | Designed to operate in flat or rugged terrain |
| Helicopter type | AS350 Series preferred |
| Survey Speed | 90 Km/h – standard |
| Receiver (Rx) | X, Y, Z |
| Position of Receiver | Mid-tow rope, asymmetrical |
| Rx elevation over the ground | 60m (for standard setup) |
| dB/dt | Yes |
| B-field | Yes |
| Data Extraction (programmable windows), QC and processing |
Done in post processing immediately after each flight |
| Data recording | Full wave form recording |
| Sampling rate | 90kHz |
| Industrial noise rejection | 60 or 50 Hz, cancelling |
| Additional Tx info | Tx Current monitor channel |
| Sensors on Tx loop | GPS, Laser Altimeter |
| Installation time | 2-4 hrs; 2 persons |
Specification Highlights.
- Transmitter frequency can be set to 25Hz or 75Hz in a 50Hz environment; 30Hz or 90Hz in a 60Hz environment
- Records the raw data coming from an XYZ receiver and a transmitter current monitor continuously (ON-time and OFF-time)
- Recorded Raw data can be converted to windows (time channels) of any times and width, according to geological requirements
EM Data View.
The EMDataView proprietary data processing software allows the user to perform post-mission data processing, including extraction of time-channels, noise reduction, leveling, and multiple recalculations, if needed, with different windowing schemas.
Key Features.
- Windows-based platform
- Data analysis and QC
- Pulse shape export
- External noise suppression
- Advanced de-noising algorithm
- Flexibility in time-channels extraction
- Output data sets can be imported into Oasis Montaj, EM Flow, Maxwell, Aarhaus, or other processing/interpretation software
Explore more with Sanborn.
Download the TDEM System Specification as PDF, or contact our sales team who are standing by ready to guide you.
