Vol. XLVIII — No. 4,812 Observational Seismology, Crustal Strain & Geodetic Inversion Edition: Global / dunopir.xyz

THE DUNOPIR CHRONICLE

"Moment magnitude scale saturation, teleseismic P-wave travel times, and inverted fault dislocation models."

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Instrumentation

Force-Balance Accelerometers: Broadband Feedback Calibration in Strong-Motion Stations

Electromagnetic feedback systems that keep proof masses stationary to record ground accelerations up to 2g without clipping.

By Viktor Halldor, Geophysical Instrumentation Engineer September 17, 2026 • 7 min read
Force-Balance Accelerometers: Broadband Feedback Calibration in Strong-Motion Stations

Capacitive Differential Displacement Sensing

Micron-scale deflection of a suspended proof mass produces differential voltage across fixed capacitor plates in the transducer head.

Electromagnetic Force Feedback Null Balance

An active feedback amplifier drives proportional current through a voice coil to generate equal magnetic force, holding the mass centered.

Dynamic Range Exceeding 140 dB Across DC to 100 Hz

Force-balance topology eliminates mechanical spring resonance artifacts, delivering flat frequency response from static gravity up to 100 Hz.

⚠️ Technical & Safety Verification

The empirical methods outlined in this study reflect verified observational seismology, crustal strain & geodetic inversion protocols and field measurements. Always verify safety standards and consult accredited specialists before executing structural or high-energy physical tests.

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