LFS-3 Low Frequency Sensor
The LFS-3 low frequency sensor measures horizontal and vertical accelerations in three axes down to frequencies of about 0.2Hz. The sensor is placed directly on the floor and is used in a feed forward loop in combination with standard AVI/LP systems to increase the vibration isolation at very low frequencies. The LFS can be retro-fitted to existing AVI-LP systems.
The table below shows the vibration isolation characteristics of an AVI/LP system with and without LFS-3.
| Frequency | AVI/LP system | AVI/LP system + LFS |
|---|---|---|
| 0.7 Hz | 6.0 db | - 2.2 db |
| 1 Hz | 2.4 db | - 9.5 db |
| 2 Hz | - 6.0 db | -26.0 db |
| 3Hz | -14.0 db | -32.0 db |
| 4 Hz | -20.0 db | -35.0 db |
| 5 Hz | -23.5 db | -43.0 db |
| 10 Hz | -34.0 db | <-50.0 db |
