SAAF is an array of rigid segments separated by special joints. Triaxial MEMS gravity sensors in the segments measure tilt. It produces data equivalent to inclinometer data but over much larger deformations and may be used vertically to track magnitude and direction of lateral deformation, and horizontally to track vertical deformation. In any pose, 3D vibration data are available from selected locations along the array. There are two basic types: Field and Research. Each is available in increments of 8 segments, where standard segment lengths include 305 mm (12”) and 500 mm (19.7”).

The main distinctions are speed, number of segments, and power consumption. SAAF is designed for solarpowered installations with wireless communication. It may be up to 100 m long. Long-term accuracy for 30 m (96’) SAAF's is 1.5 mm (0.06”).

Vibration data are available from up to 3 segments along the array at 40Hz sampling, and at 35 Hz from 4 segments. All communication in the array is digital. Data are carried in a small cable to a digital logger. Most installations use solar power and provide wireless data over the internet.

SAAR is designed to collect high fr

equency data from all sensors continuously. Each microprocessor in an SAAR (1 microprocessor per 8 segments) has a dedicated communication line. SAAR can be supplied with up to 24 high-speed segments.