Sensors - Broadband Seismometers and Accelerometers

Broadband Seismometers

Model 151 "Observer"

The 151 Broadband Seismometer, "Observer", is a force-balance feedback sensor with frequency bandwidth

Model 151-30 = 0.033 Hz (30 sec) - 50Hz flat to velocity.
Model 151-60 = 0.0166 Hz (60 sec) - 50Hz flat to velocity.
Model 151-120 = 0.0083 Hz (120 sec) - 50Hz flat to velocity.

Broadband Seismometer "Observer"

Accelerometers

Accelerometers are devices that measure the acceleration of motion of structures as well as subsurface monitoring of the ground. These accelerometers use a Micro-Electro-Mechanical System (MEMS) variable capacitance displacement sensor. Because no coils or magnets are used, the accelerometer is inherently stable over temperature, with excellent reliability, linearity, hysteresis, and noise levels.

MEMS Accelerometers

Uniaxial Accelerometers
Model 131B-01/1

 Triaxial Borehole Accelerometers

Triaxial Borehole Accelerometers
Model 131A-02/BH ( Low Noise )

 Strong Motion Accelerometer

Strong Motion Accelerometer
Model 147-01 ( Low Noise )

REF TEK equipment consists of four major product lines: