Magnetometer High Speed Sequential Cancellation
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Solution Overview
Problem
Existing magnetometer systems face challenges in achieving high bandwidth and sensitivity due to the need for reference signals that reduce bandwidth and increase noise, making them less effective in applications requiring rapid magnetic field detection and imaging.
Innovation Solution
The system eliminates the need for a reference signal by using a fixed 'system rail' photo measurement as a nominal reference, allowing for increased bandwidth and sensitivity by omitting the reference signal and utilizing RF pulse excitation sequences, along with additional signal processing to adjust for intensity variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference signal with full repolarization is used prior to each measured signal, then sensitivity is improved by correcting for optical excitation power fluctuations, but bandwidth is reduced and measurement noise increases
Solution Approach 1:
The patent extracts and removes the reference signal acquisition step from the measurement sequence. By eliminating the reference signal measurement that requires full repolarization, the system achieves faster measurement cycles and higher bandwidth while maintaining sensitivity through alternative correction methods using stored nominal reference values.
Solution Approach 2:
The patent performs the reference signal measurement once initially to establish a nominal reference value, then stores this value for reuse. This preliminary action eliminates the need for repeated reference measurements, thereby increasing bandwidth without sacrificing the ability to correct for optical power fluctuations.
2Measurement precision
If a reference signal with full repolarization is used prior to each measured signal, then sensitivity is improved by correcting for optical excitation power fluctuations, but measurement noise increases due to including reference signal noise
Solution Approach 1:
The patent removes the reference signal measurement from the active measurement cycle, thereby eliminating the noise contribution from reference signal acquisition. Sensitivity is maintained by using the previously stored nominal reference value for correction, which does not introduce ongoing noise.
3Productivity
If only an RF pulse excitation sequence is used without a reference signal, then bandwidth is increased and sensitivity is improved, but compensation for intensity shifts requires additional signal processing
Solution Approach 1:
The patent implements feedback by continuously monitoring the measured signal intensity and comparing it against the stored nominal reference value. This feedback mechanism enables real-time correction for optical power fluctuations through signal processing that adjusts the measurement based on intensity variations, maintaining sensitivity without requiring reference signal acquisition.
Data Source
AI summary
Magnetometers with high bandwidth acquisition of data with increased sensitivity are described herein. Increased bandwidth and sensitivity may be achieved by eliminating a reference signal for full repolarization of the magneto-optical defect center material prior to acquisition. Elimination of the reference signal eliminates the time needed to repolarize the magneto-optical defect center material and the acquisition time for the reference signal. A radiofrequency (RF) pulse sequence may be activate to apply an RF field to the magneto-optical defect center material and a magnetic field measurement may be acquired using the magneto-optical defect center material. The magnetic field measurement may be acquired independent of a reference magnetic field measurement.