High-Sensitivity Matched Fluxgate Magnetometer Pair
The Paired FG-3+ sensor set delivers two high-precision fluxgate magnetic field sensors with closely matched electrical characteristics, designed for applications requiring balanced dual-sensor performance and reproducibility.
Each sensor in the pair is based on the FG-3+ one-axis fluxgate magnetometer, a compact yet highly sensitive magnetic field sensor capable of measuring subtle field variations with precision far beyond typical integrated magnetometers. It is an excellent replacement for legacy Speake & Co. FGM-1 and FGM-3 sensors and is particularly suited for geophysical, industrial, scientific, and embedded applications.
Key Specifications:
Matched sensor pair — aligned for equivalent electrical and magnetic response for use in differential or comparative measurement systems.
Sensor type: 1-axis fluxgate magnetometer.
Operating range: ±50 microtesla (±0.5 Oe).
Output: Robust 5 V square-wave signal; frequency/period proportional to magnetic field strength for easy interfacing with microcontrollers and data acquisition systems.
Supply: Single +5 V DC (typical); up to +7 V maximum.
Typical supply current: ~12 mA.
Output frequency range: ~50 kHz – 120 kHz (period ~8.5 µs to 25 µs across full ±50 µT).
Bandwidth: DC to ~20 kHz.
Operating temperature: 0 °C – 50 °C.
Dimensions: 5.5 cm × 1.5 cm per sensor.
Features & Benefits:
Matched pair ensures consistency: Perfect for gradiometer setups, differential sensing, and noise-cancelling dual-sensor measurements.
Exceptional magnetic sensitivity: Far exceeds typical integrated magnetometer solutions for precise anomaly detection.
Easy digital interfacing: Frequency-based output makes signal acquisition and processing straightforward on microcontrollers, FPGAs, and data loggers.
Low temperature coefficient: Stable performance across temperature variations.
Broad application range: From geophysical and archaeological surveys to metal and pipeline detection, traffic monitoring, and magnetic anomaly mapping.
Test Report Insights (Independent Evaluation)
Independent testing confirms the FG-3+ output signal’s reliance on the period of its square-wave output and verifies its high sensitivity over a wide range of magnetic fields. Although the raw period-to-field response shows non-linearity in detailed calibration conditions, proper signal processing techniques allow effective conversion and use in precise measurement systems.