Magnetometer

The High Sense Mag (MMS-4) is an intelligent high sensitivity and high resolution magnetometer processor able to process signals from multiple (4) continuously measuring magnetometer sensors. Provision for real time and / or post mission magnetic compensation of airframe motion is optionally available.

The High Sense Mag was designed as a key component of the PEI Airborne Geophysical Information System (AGIS). It is also used in Portable/ Base Station magnetic system (PGIS-HSMag, PGIS-HSMag/Base Station) and can be used with any data system capable of receiving RS-232 serial data. The processor contains synchronization input from GPS 1PPS (pulse per second), to assure precise signal sampling without quantizing errors.

The MMS-4 is a high resolution, high sampling rate magnetometer processor unit based on many years of research and experience. It is implemented in several formats including PC-104 and contains up to four continuous frequency processing input modules with signal decouplers and power control circuitry. The MMS-4 processor can be supplied in board level.

Technical Specifications

• Input: max 4 sensors without compensation, max 2 sensors with compensation
• Resolution: 0.0002nT or 0.2 pT
• Sampling rates: 5,10,20,25,50, 100 Hz
• Bandwidth: 0.7, 1.4, 2.8, 3.5, 7.0, 14 Hz
• Eight differential 16 bit analog inputs
• Dynamic range: 15000 – 100000 nT
• Housing size: approx 150mm x 50mm x 210 mm
• Optional special power supply for sensor power 30-32 VDC, 300 W available on request
• Sequential sensor power on
• Optional compensator: Fluxgate magnetometer sampled at the magnetometer rate
• Communication: RS-232 @ 57Kbaud
• Synchronization: GPS 1PPS
• Output:  serial data string
• Operating Temperature:  -15 to 55 C
• Power requirements:

Magnetometer system: 22 to 30 VDC
Processor: 7 to 10 watt
Sensor: 70 watts per sensor - startup
25 watts per sensor - operating

 

Magnetic Compensation

Real time or post mission compensation is optionally available with the MMS-4 processor. Compensation is achieved by combining the frequency measurement from any continuous reading sensor (Cs, K, He) with the measurements of analog outputs of a tri-axial fluxgate magnetometer. Proprietary algorithms combines these measurements and eliminates most of the influence caused by airframe movement through the magnetic field - pitch, roll, yaw and aircraft heading.

Magnetometer   MMS4  testing  program

PEIMagTest program is designed for High Sense Magnetometer testing. Raw, compensated (if present) and analog magnetometer data are displayed on separate pages. More...

Raw and compensated gradiometer output - full scale 5 nanoTesla

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