Synchronized Readout for Narrowband Detection of Time-Varying Electromagnetic Fields
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Solution Overview
Problem
Current NMR detection techniques using solid state spins, such as nitrogen vacancy centers in diamond, face challenges in achieving narrow spectral resolution due to short spin state lifetimes and thermal spin magnetization fluctuations, limiting their ability to detect time-varying electromagnetic fields effectively.
Innovation Solution
A synchronized readout pulse sequence is implemented to coherently interrogate sample nuclei over multiple measurements, utilizing a sensor with a solid state electronic spin system, external perturbations, and a digital timing generator to synchronize light and perturbation pulses, allowing for sensitive measurement of thermal spin polarization rather than statistical fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional NMR detection using solid state spins is used, then sensitivity is improved, but spectral resolution deteriorates
Solution Approach 1:
The patent applies preliminary action by performing multiple preparatory measurements and coherently averaging the results. The system accumulates N individual measurements before final detection, effectively extending the interrogation duration beyond the natural spin state lifetime. This coherent averaging process builds up signal strength over time while maintaining spectral resolution, resolving the contradiction between measurement precision and duration of action.
2Measurement precision
If NV-detected NMR with nanoscale sample volumes is used, then sensitivity to small samples is improved, but measurement precision deteriorates due to thermal spin magnetization fluctuations
Solution Approach 1:
The patent implements continuity of useful action by continuously accumulating measurements over time through coherent averaging. Instead of relying on a single measurement that would be dominated by thermal fluctuations in nanoscale samples, the system continuously performs N measurements and averages them coherently. This continuous accumulation process maintains detection precision even when the sample volume is reduced to nanoscale dimensions, as the signal-to-noise ratio improves with the number of accumulated measurements.
3Measurement precision
If standard readout pulse sequences are used, then ease of operation is maintained, but spectral resolution deteriorates
Solution Approach 1:
The patent applies periodic action by implementing a synchronized readout pulse sequence that repeats a standardized set of operations N times. Each measurement cycle follows the same periodic pattern: apply microwave pulses to initialize and manipulate spin states, perform detection, and reset. This periodic repetition with coherent averaging achieves high spectral resolution while maintaining operational simplicity through the use of a standardized, repeatable pulse sequence that can be automated.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances spectral resolution to less than 1 Hz for time-varying electromagnetic fields, enabling detection of nuclear magnetic resonance signals with improved sensitivity and coherence times, suitable for molecular identification and imaging.
Implementation Method 1
the sensor includes a solid state electronic spin system disposed below the surface of the sensor, wherein the solid state electronic spin system has a spin-state dependent fluorescence
Implementation Method 2
the source of light and the first and second external perturbations are configured to coherently and independently manipulate the spin states of at least one solid state electronic spin system
Implementation Method 3
a source of first external perturbation, wherein the source of first external perturbation generates a magnetic field
Implementation Method 4
a detector to optically measure the solid-state electronic spins spin-state dependent fluorescence
Data Source
AI summary
A synchronized readout (SR) technique for spectrally selective detection of oscillating magnetic fields with sub-millihertz resolution, using coherent manipulation of solid state spins.