Diamond NV Center Magnetic Sensor Pixel Mapping
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Solution Overview
Problem
Existing high-sensitivity magnetic measurement apparatuses, such as those using SQUID devices, require cryogenic environments, while diamond crystal-based systems operating at room temperature struggle to utilize all nitrogen-vacancy pairs effectively due to orientation-related noise, limiting magnetic field measurement accuracy.
Innovation Solution
A magnetic measurement apparatus with a diamond crystal and an image sensor where nitrogen-vacancy pairs are one-to-one corresponded to pixels, allowing for pre-calibration of orientations and efficient use of all pairs, improving measurement accuracy by integrating pixel outputs and maintaining constant microwave frequency differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If diamond crystal-based magnetic measurement apparatus operates at room temperature, then the operational complexity is reduced, but the measurement precision deteriorates due to inability to utilize all nitrogen-vacancy pairs effectively
Solution Approach 1:
The patent segments the detection process by assigning each nitrogen-vacancy pair to a corresponding pixel in the image sensor. This one-to-one correspondence allows independent measurement and processing of signals from each NV pair, enabling effective utilization of all four orientation types without requiring cryogenic temperatures. The segmentation resolves the contradiction by maintaining room temperature operation while achieving high measurement precision through pixel-level signal differentiation.
Solution Approach 2:
The patent applies preliminary action by performing pre-calibration of the image sensor to establish the one-to-one correspondence between nitrogen-vacancy pairs and pixels before actual measurement. This pre-established mapping enables the system to correctly attribute fluorescence signals to specific NV pairs and their orientations, thereby achieving high measurement accuracy at room temperature without requiring complex real-time correction procedures.
2Measurement precision
If all nitrogen-vacancy pairs are utilized for measurement, then the sensitivity is improved, but the noise from different orientations increases
Solution Approach 1:
By segmenting the fluorescence detection into individual pixel channels corresponding to specific NV pair orientations, the system can separately analyze and process signals from each orientation type. This segmentation allows the inclusion of all NV pairs for enhanced sensitivity while managing orientation-related noise through independent signal processing for each pixel-NV pair correspondence.
Solution Approach 2:
The patent implements feedback mechanisms through the pre-calibrated one-to-one correspondence system, where the known orientation information of each NV pair (stored during calibration) is used to interpret and correct the fluorescence signals in real-time. This feedback approach enables the system to distinguish and compensate for orientation-related variations, thereby reducing noise while maintaining high sensitivity from utilizing all NV pairs.
3Object-generated harmful factors
If only a subset of nitrogen-vacancy pairs is used for measurement, then the noise is reduced, but the productivity decreases
Solution Approach 1:
The patent segments the measurement process into independent pixel-NV pair channels, allowing parallel processing of signals from all NV pairs simultaneously. This segmentation enables the system to utilize all available NV pairs for measurement (maximizing productivity) while maintaining low noise levels through individual channel processing and the pre-established one-to-one correspondence that prevents signal mixing and cross-contamination.
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 magnetic field detection accuracy and efficiency by utilizing all nitrogen-vacancy pairs, improving sensitivity and reducing noise, thereby enabling more precise magnetic field measurements at room temperature.
Implementation Method 1
Green laser light is used as a blue-green light source which applies exciting light to a diamond crystal as a sensor for measuring a magnetic field, and a CCD array is used to detect a red fluorescence output from the diamond crystal.
Implementation Method 2
A magnetic field is measured from the minimum fluorescence intensity value of the microwave frequency dependence of the red fluorescence intensity obtained by sweeping the frequency of microwaves applied to the diamond crystal.
Data Source
AI summary
High-accuracy magnetic measurement is performed by efficiently using nitrogen-vacancy pairs in all orientations. A magnetic measurement apparatus includes a diamond crystal and an image sensor. The diamond crystal has nitrogen-vacancy pairs. The image sensor detects the intensities of fluorescence generated by an exciting light applied to the diamond crystal by using a plurality of pixels. The nitrogen-vacancy pairs of the diamond crystal are made to one-to-one correspond to the pixels. The fluorescence generated by one nitrogen-vacancy pair is received by one pixel made to correspond to the nitrogen-vacancy pair.