Diamond NV Magnetometer Sensor Unit for Magnetic Field Detection
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Solution Overview
Problem
Existing magnetic field detection technologies face challenges in achieving high sensitivity and spatial resolution while minimizing interference from background magnetic fields, particularly at larger distances from the object being measured, due to limitations in sensor placement and the need for costly shielding devices.
Innovation Solution
A hybrid sensor unit comprising a diamond-based NV magnetometer for measuring actual magnetic fields in close proximity to the object and a gas vapor cell or SQUID magnetometer for determining background fields, allowing for calibration and subtraction of background noise, thereby enabling precise detection of small magnetic fields without elaborate shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If NV magnetometers are placed close to the object for high spatial resolution, then spatial resolution is improved, but background magnetic field interference increases
Solution Approach 1:
The measurement system is segmented into two independent sensor units: an NV magnetometer for high-resolution local measurement and a reference magnetometer for background field measurement. Each sensor performs a specialized function, allowing the system to simultaneously achieve high spatial resolution while compensating for background interference through separate measurement channels.
Solution Approach 2:
A reference magnetometer acts as an intermediary that measures the background magnetic field without being affected by the object's magnetic signals. The reference sensor's measurements serve as a mediator to subtract the background component from the NV magnetometer's readings, isolating the object's magnetic field contribution.
2Measurement precision
If reference magnetometers are used to measure background fields, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Two different magnetometer technologies (NV magnetometer and reference magnetometer) are merged into a single integrated sensor unit. This combination allows the system to leverage the high spatial resolution of NV centers and the background field measurement capability of reference sensors, achieving improved measurement precision while containing complexity within a unified device architecture.
3Object-affected harmful factors
If shielding devices are used to reduce background interference, then harmful factors are reduced, but device complexity and cost increase
Solution Approach 1:
The mechanical shielding system is replaced with a sensor-based compensation approach. Instead of using physical barriers to block magnetic fields, the invention uses a reference magnetometer to measure the background field and subtract it computationally from the NV magnetometer's readings, eliminating the need for complex shielding structures.
4Ease of operation
If NV magnetometers operate at larger distances, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The system adds a temporal dimension to the measurement process by performing sequential measurements: first measuring the background field with the reference sensor, then measuring the total field with the NV sensor. This temporal separation allows the NV magnetometer to operate at larger distances while the background subtraction maintains measurement precision, effectively decoupling distance constraints from precision requirements.
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 combines high sensitivity and spatial resolution of NV magnetometers with the exceptional sensitivity of gas vapor cell or SQUID magnetometers, eliminating the need for expensive shielding and enabling miniaturization, while effectively accounting for background interference.
Implementation Method 1
the NV center has a fluorescent effect and thus emits fluorescence
Implementation Method 2
the magnetic resonance of the triplet of the ground state is optically detected, see 3A state in FIG. 1 (ODMR—optically detected magnetic resonance)
Implementation Method 3
The position is linearly dependent on the magnetic field; see FIG. 3, due to the Zeeman effect
Data Source
AI summary
A sensor unit for detecting a magnetic field is disclosed. The sensor unit includes (i) a light source for generating excitation light, (ii) at least one first sensor for determining a measurement signal of an object, and (iii) a second sensor for determining a background magnetic field. The first sensor is designed as a diamond-based NV magnetometer and includes a highly sensitive diamond having at least one negatively charged NV center that has a fluorescent effect and thus emits fluorescence.