Magnetic Field Measuring Device Optical Alignment
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Solution Overview
Problem
Existing magnetic field measuring devices face challenges in accurately measuring magnetic fields due to difficulties in aligning probe light at specific directions, especially when multiple cells are involved, leading to noise interference from external magnetic fields.
Innovation Solution
A magnetic field measuring device configuration that includes linearly polarized light, branching elements, and optical axis adjustment mechanisms to ensure parallel incidence of light into cells, allowing for precise alignment and exclusion of external magnetic field influences, enabling high-accuracy gradiometer-type or multichannel-type measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple cells are used for measurement, then measurement precision is improved, but device complexity increases due to difficulty in aligning probe light directions
Solution Approach 1:
The patent combines multiple cells (first cell and second cell) into a single integrated magnetic field measuring device structure. The cells are arranged in specific spatial relationships (e.g., parallel or perpendicular configurations) and share common optical components such as the probe light source and magnetic field measuring units, thereby achieving improved measurement precision while managing device complexity through unified design
Solution Approach 2:
The device is segmented into multiple independent but coordinated cells, each capable of measurement. The probe light path is segmented to pass through different cells in specific sequences (e.g., first cell then second cell, or vice versa), allowing independent optimization of each cell's orientation while maintaining overall system alignment through structured light path design
2Measurement precision
If cells are positioned in determined directions for probe light incidence, then measurement precision is improved, but ease of operation deteriorates due to difficult position adjustment
Solution Approach 1:
The cells are pre-positioned and pre-aligned during the device manufacturing or setup phase to specific determined directions relative to the probe light path. This preliminary alignment ensures that during operation, the cells automatically receive probe light in the correct directions without requiring frequent manual adjustment, thus maintaining high measurement precision while improving ease of operation
Solution Approach 2:
The device incorporates adjustable mechanisms that allow the cells to be dynamically positioned and oriented. These mechanisms enable operators to adjust cell positions and orientations during setup or calibration phases, and potentially during operation, to optimize alignment with the probe light direction based on specific measurement 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
The solution enables accurate measurement of magnetic fields with reduced noise from external sources, allowing for precise detection of magnetic fields generated by sources like the heart or brain, with improved flexibility in device configuration and alignment.
Implementation Method 1
a light irradiator that performs irradiation with linearly polarized light
Implementation Method 2
differences in magnetic field intensity between the first measurement position and the second measurement position are directly measured as differences between polarization rotating angles of the probe light
Data Source
AI summary
A magnetic field measuring device includes: a first cell and a second cell in which alkali metal atoms are entrapped and which are disposed in this order in a sensing direction of a magnetic field; a first reflective mirror, a second reflective mirror, and an autocollimator as an optical axis detector. Beam light as second polarized light and beam light as fourth polarized light, which are detected by the autocollimator, have orientations of optical axes in the same direction.