The Treble interrogator provides a lower cost alternative to the Treble+, with excellent signal quality in shorter range applications and stronger motion situations, including perimeter security, detection of third party interference and industrial equipment monitoring.

Both Terra15 Distributed Acoustic Sensing (DAS) interrogators are based on our unique and patented architecture which provides low-noise, flexible and quantitative data throughout the active-seismic, passive-seismic and acoustic frequency bands.

This performance advantage in both the Treble and Treble+ is possible with instrument strain-noise that decreases with higher-frequency – a unique and worldwide industry first in distributed acoustic sensing.

Selectable Gauge or Gauge Free Data

The native velocity datatype does not require the user to define a gauge at the time of acquisition. This “gauge-free” operation results in a system that offers unrivalled flexibility and sensitivity. Sensitivity enhancement over native strain systems is especially noticeable for seismic waves arriving close to perpendicular (90°) to the fiber. Additionally the native velocity datatype may be directly compared against directional geophone data.

For applications where strain or strain-rate data are preferable, the interrogators allow the gauge length to be software defined in post-processing. This uniquely allows a variable gauge length to be applied for different frequency bands; fibre sections or times, resulting in optimal signal to noise enhancement.