Force Balance Accelerometer AFB
Accelerometer Force Balance AFB is a high sensitivity sensor for long-term monitoring of dams and buildings, ideal for studying seismic events at low frequencies of motion.
AFB
Solgeo Models AFB Force Balance Accelerometers are high sensitivity, low noise sensors designed for use in seismic and low level, low frequency motion studies.
The accelerometers are self-contained and provide a high level, low impedance output.
No signal conditioning is required in most applications.
These sensors utilize low noise electronics in conjunction with the force balance principle to make possible measurements in the low frequency micro-G range. Aside from the traditional DC-coupled zero output, the AFB-3C& 2C & 1C also provides AC coupled zero output which eliminates tilt induced or offset errors facilitating high amplification of the basic output.
No signal conditioning is required in most applications.
These sensors utilize low noise electronics in conjunction with the force balance principle to make possible measurements in the low frequency micro-G range. Aside from the traditional DC-coupled zero output, the AFB-3C& 2C & 1C also provides AC coupled zero output which eliminates tilt induced or offset errors facilitating high amplification of the basic output.
Main features
- Single, biaxial or triaxial accelerometer settings
- available in 2 different configurations for horizontal or vertical mounting
- 2 different output cable types: connector or gland cable.
Applications
- Long-term monitoring on dams, buildings and heritage structures
- Monitoring that requires higher sensitivity
Mines and quarries
Monuments
Dam monitoring
Seismic
and microseismic networks
and microseismic networks
Technical Characteristics
Electronic features
| Number of channels | ±0,25 g, ±0,5 g, ±1 g, ±1 g, ±2 g, ±4 g |
| Full scale acceleration (available Ranges) | ±0.25 G; ±0.5 G; ±1 G; ±2 G; ±4 G |
| Output voltage | ±10 volts differential |
| Sensitivity | ±40V/g; ±20V/g; ±10V/g; ±5V/g; ±2,5V/g |
| Frequency response | 0-200 Hz |
| Operating voltage | 10-15Vdc (80mA for 3 axis unit) |
| Output impedance | 100 Ohm |
| Dynamic range | 1g version >135dB (USGS CPSD method) >165dB (per bin with respect to full scale |
| Non-linearity | <0,1% f.r. |
| Cross axis sensitivity | <0.5% |
| Offset drift | 0.5 mg/°C |
| Full scale drift | 200 ppm/°C |
| Sensor test | 1/8 fs |
| Input test | 1/8 fs |
| Orthogonality error | <0.05% |
| Damping | 0.707 |
Environmental characteristics
| Temperature, operating | -20 to +55 °C |
| Temperature, storage | -40 to +70 °C |
| Humidity | 100% R.H. |
Physical characteristics
| Weight | 3 kg |
| Dimension (LxWxH) | 140 x 155 x 85 mm (without connectors) triaxial model 169 x 53 x 81 mm (without connectors) mono and biaxial model |
| Case material | Aluminium with anti-corrosive treatment |
| Protection rating | IP67 with connector or IP68 with cable gland |
| Electrical Interface | 10 terminal pins CONNECTOR / cable gland |
Gallery