Alternating Bias Magnetic Field Solid-State Spin Sensor for Low Frequency Measurements of Physical Quantities

In the realm of magnetic field sensing, achieving high sensitivity in low-frequency scenarios presents a considerable challenge. Traditional sensor systems struggle to accurately detect low-frequency changes due to noise caused by slow drifts in the bias magnetic field. The need for precise and reliable magnetic field measurements across various domains, including scientific research, geology, navigation, and many other fields, remains a significant motivator for technological advancement in this area. Previous methodologies to address the problem of bias magnetic field drift often resulted in compromised overall performance. The bias field's slow drift created low-frequency noise that hindered accurate field measurements. Ultimately, the issue lies in the lack of control and compensation for bias magnetic field drift, causing a substantial limitation in the technology's capacity to detect low-frequency changes effectively.

Technology Description

The technology in focus is a solid-state spin sensor system enhanced with the application of a bias magnetic field. This application enables the sensor to accurately measure vector magnetic fields despite disturbances. However, a significant challenge arises when the bias magnetic field starts to drift slowly, which can introduce noise that obscures low-frequency field measurements. To overcome this obstacle, the system employs a mechanism that reverses the polarity of the bias magnetic field at defined intervals. What differentiates this system from others is its ability to remove, nullify, or cancel the undesired slow drift of the bias magnetic field's magnitude. This intricate process of reversing the bias magnetic field’s direction allows for far more precise measures, rendering the system particularly suitable for detecting low-frequency changes in the magnetic field, including changes in the millihertz (mHz) range, or other physical parameters.