ODMR Magnetic Field Measurement with Reference Noise Cancellation
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Solution Overview
Problem
Magnetic field measurement devices using optically detected magnetic resonance (ODMR) face challenges with low detection signal strength, making them susceptible to noise and reducing measurement accuracy.
Innovation Solution
A measurement device and method that includes a measurement and reference magnetic resonance member, high frequency magnetic field generators, light emitting and receiving devices, and an arithmetic processing part to derive measurement values based on fluorescence sensor signals, employing common mode rejection to suppress noise and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optically detected magnetic resonance is used for magnetic field measurement, then magnetic field measurement capability is achieved, but detection signal strength becomes weak and measurement accuracy decreases
Solution Approach 1:
The patent divides the measurement system into two separate magnetic resonance members: a measurement magnetic resonance member exposed to the measured magnetic field and a reference magnetic resonance member shielded from it. This segmentation allows independent detection of field-induced effects while canceling common noise sources through differential measurement of their respective fluorescence signals
Solution Approach 2:
The reference magnetic resonance member acts as an intermediary that experiences the same environmental conditions (temperature, vibration, electromagnetic interference) but is shielded from the measured magnetic field. Its fluorescence signal serves as a reference that, when compared with the measurement member's signal, enables noise cancellation and improves measurement accuracy
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
The solution effectively suppresses noise components, enhancing measurement accuracy by deriving accurate measurement values.
Implementation Method 1
a magnetic field measurement device performs magnetic measurement using optically detected magnetic resonance (ODMR) in which electron spin resonance of a sensing member such as a diamond structure having nitrogen and lattice defects (NV center: Nitrogen Vacancy Center) is utilized
Implementation Method 2
a light emitting device that emits excitation light to be irradiated to the measurement magnetic resonance member and the reference magnetic resonance member, a measurement light receiving device that receives fluorescence emitted by the measurement magnetic resonance member in response to the excitation light
Data Source
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AI summary
A measured field is applied to a measurement magnetic resonance member (1) but is not applied to a reference magnetic resonance member (1R). High frequency magnetic field generators (2, 2R) perform an electron spin quantum operation for the measurement magnetic resonance member (1) and the reference magnetic resonance member (1R) by using a measurement microwave and a reference microwave, respectively. A power divider (11a) distributes a high frequency current from a high frequency power source (11) to the high frequency magnetic field generators (2, 2R). An optical distributor (21) distributes excitation light from a light emitting device (12) to the measurement magnetic resonance member (1) and the reference magnetic resonance member (1R). Light receiving devices (13, 13R) receive fluorescent from the measurement magnetic resonance member (1) and the reference magnetic resonance member (1R), respectively, and generate fluorescent sensor signals, respectively. An arithmetic processing part (30) derives a measurement value based on the fluorescent sensor signals.