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Advanced Digital Mapping System for Computerized Magnetic Field Measurement

The Digital Aid in Computerized Magnetic Field Mapping system is designed to achieve error-free, high-resolution sensor readings. This innovative, inexpensive digital solution features a bipolar analog voltage-to-frequency converter (VFC) and streamlined circuit schematics to enhance functionality. Key goals include achieving microvolt resolution and minimizing drift and noise while addressing the challenges of directional ambiguity and multiple error sources. This computer-assisted system integrates high-frequency 24-bit counters, asynchronous counting, and DMA transfers, ensuring moderate-resolution, continuous field gradient measurement efficiency.

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Advanced Digital Mapping System for Computerized Magnetic Field Measurement

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  1. Digital Aid in Computerized Magnetic Field Mapping Sarbajit Pal PcAPAC 2000

  2. MFM measurement Jig

  3. Computerized MFM System

  4. Goals : • Error free High resolution Sensor • Inexpensive digital solution • Ready Availability

  5. Bipolar Analog VFC

  6. Simplified VFC Schematic +Vref V/f AD460 R1 RG2 A1 D1 Q1 A3 R2 R2 RG1 I2 I3 Q2 GATES D2 A2 Q3 Q4 Level Shift UP Down

  7. Analog solution Constraints • Comparator • Micro-volt Resolution • V and pA offset • low drift & low noise • Good AC Response Complex and Unsatisfactory circuits Directional Ambiguity Multiple sources of error Results In...

  8. PC Aided Digital Bipolar VFC • High frequency 24 bit counters • Asynchronous counting • Interrupt Generation • DMA Transfer • Driver routines • Pseudo-Multitasking Results In... • Moderate resolution error free continuous field gradient sensor

  9. Bipolar Digital VFC

  10. Timing Diagram

  11. END Thank You

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