Developing A Search-Coil Magnetometer Breadboard Circuit

Abstract

The search for precise and efficient measurement techniques in magnetometry has given rise to the growth of multiple sensor technologies. Among them is the coil sensor (also known as induction coil, pickup coil, or search-coil). First described in 1967 by H, Zijlstra, they are still widely used in many applications today. This thesis aims to design and implement a search coil magnetometer on breadboard circuit, aimed to provide a precise and cost-effective solution for magnetic field measurements. The objective of this research is to develop a compact and reliable system capable of accurately detecting and quantifying magnetic fields across a wide frequency range. The thesis begins with a comprehensive review of magnetometer technologies and their applications. The advantages as well as limitations of various sensor types are discussed, highlighting the need for an optimized solution that balances sensitivity, bandwidth, and cost. The search-coil magnetometer approach was chosen due to its inherent simplicity and suitability for both low and high frequency measurements. The design process involves consideration of circuit components, noise reduction techniques, and calibration procedures. The breadboard implementation allows for rapid prototyping and iterative optimization, enabling flexibility in tailoring the system to specific requirements. Theoretical analyses are conducted to validate the design choices and assess the circuit's performance. To evaluate the search-coil magnetometer breadboard circuit, experimental tests are conducted under controlled laboratory conditions. The results illustrate that the device is capable of measuring AC magnetic fields from 1Hz to higher than 6kHz, with minimum gain of -77.5dBV/V.