Diamond Magnetometer Light Pipe and Waveguide Filter
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Solution Overview
Problem
The inefficient transmission of light between a diamond with nitrogen vacancies and a photo detector in magnetometers, due to electromagnetic interference from electrical components, reduces the sensitivity and accuracy of magnetic field measurements.
Innovation Solution
The use of a light pipe to efficiently transmit light from the diamond to a photo detector, while an EMI shield with a waveguide cutoff filter attenuates electromagnetic waves, minimizing interference and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light pipe is used to transmit light from the diamond to the photo detector, then light transmission efficiency is improved, but electromagnetic interference from electrical components affects measurement accuracy
Solution Approach 1:
A waveguide cutoff filter is introduced as an intermediary component between the light pipe and the diamond assembly. This filter acts as a mediator that allows optical signals to pass through while blocking electromagnetic interference from electrical components, thus resolving the contradiction between maintaining light transmission efficiency and protecting against electromagnetic interference
Solution Approach 2:
The waveguide cutoff filter converts the harmful electromagnetic interference into a beneficial filtering function. By designing the filter with specific waveguide dimensions, it allows desired optical wavelengths to pass while attenuating harmful electromagnetic frequencies, effectively transforming the interference problem into a solution that enhances measurement accuracy
2Adaptability or versatility
If electrical components are placed near the diamond assembly for generating RF and magnetic fields, then magnetometer functionality is improved, but electromagnetic interference increases
Solution Approach 1:
The waveguide cutoff filter serves as a protective intermediary between the electrical components (RF generator, magnetic field generator) and the diamond assembly. It allows the electrical components to function near the diamond for generating necessary fields while blocking the electromagnetic interference they produce from affecting the nitrogen vacancy center measurements
Solution Approach 2:
The filtering protection is applied locally at the critical interface where light enters and exits the diamond assembly. The waveguide cutoff filter is positioned specifically at the light pipe entry/exit points, providing targeted electromagnetic shielding exactly where the interference would most affect the optical measurement process
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 configuration significantly increases the sensitivity of the magnetometer by effectively reducing electromagnetic interference and ensuring accurate magnetic field measurements.
Implementation Method 1
a light pipe configured to direct the second portion of the light from the diamond to the second sensor
Implementation Method 2
a first waveguide cutoff filter surrounding the first light pipe that is configured to attenuate electromagnetic waves
Implementation Method 3
A light source can be used to excite the defect
Data Source
AI summary
A device includes a diamond assembly. The diamond assembly includes a diamond with a plurality of nitrogen vacancy centers and electrical components that emit electromagnetic waves. The device also includes a light source configured to emit light toward the diamond and a photo detector configured to detect light from the light source that traveled through the diamond. The device further includes an attenuator between the diamond assembly and the photo detector. The attenuator is configured to attenuate the electromagnetic waves emitted from the electrical components of the diamond assembly.