Magnetic Field Sensor Light Intensity Stabilization
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Solution Overview
Problem
Existing optical pumping magnetic field measurement technologies face instability due to fluctuations in light intensity from the light sources, which affect the sensitivity and stability of magnetic field detection, as they do not adequately stabilize light intensity.
Innovation Solution
The implementation of a light source apparatus with frequency and intensity stabilization units, utilizing a laser as the light source, which includes a frequency stabilization unit and an intensity stabilization unit to stabilize the light intensity and frequency, thereby eliminating noise from the sensor unit by calculating differences between lights passing through it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light sources are used for magnetic field detection without intensity stabilization, then the device complexity is reduced, but the measurement precision deteriorates due to light intensity fluctuations affecting detection stability
Solution Approach 1:
The patent implements feedback control mechanisms where light intensity fluctuation detection circuits continuously monitor the intensity of pump light and probe light, and light intensity fluctuation correction units automatically adjust the light intensity to compensate for detected fluctuations. This closed-loop feedback system stabilizes light intensity without requiring manual intervention, thereby improving measurement precision while maintaining automated operation.
Solution Approach 2:
The patent introduces intermediary components including light intensity fluctuation detection circuits that act as sensors between the light source and the magnetic field detection process, and light intensity fluctuation correction units that serve as actuators to adjust light intensity. These intermediary elements mediate between the light source and the alkali metal vapor cell, isolating the detection process from light intensity fluctuations and enabling precise magnetic field measurement.
2Reliability
If light intensity fluctuation correction units are added to stabilize light intensity, then the reliability of magnetic field measurement is improved, but the device complexity increases
Solution Approach 1:
The patent merges the light intensity stabilization function with the existing magnetic field detection system by integrating light intensity fluctuation detection circuits and correction units into the overall apparatus architecture. The pump light source and probe light source are combined in a single system with shared stabilization mechanisms, allowing the reliability improvement to be achieved without proportionally increasing device complexity through separate independent stabilization systems.
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 stabilizes the signals in magnetic field measurement, enhancing the sensitivity and stability of the detection process by correcting light intensity fluctuations and preventing noise interference.
Implementation Method 1
spin polarize the alkali metal in the sensor unit by a laser beam
Implementation Method 2
a static magnetic field is applied to this glass cell, and an energy level of the alkali metal in the glass cell is split by the Zeeman effect
Implementation Method 3
generate magnetic resonance in the sensor unit by applying an RF (a Radio Frequency) magnetic field to the sensor unit
Data Source
AI summary
The present invention addresses the problem of stabilizing signals in magnetic field measurement using optical pumping. In order to solve the problem, disclosed is a light source apparatus (10) that is characterized in having: a light intensity fluctuation detection circuit (130) that detects intensity fluctuation of light outputted from a laser output unit (11); and an acousto-optic modulator (121) that corrects light intensity on the basis of light intensity fluctuation detected by means of the light intensity fluctuation detection circuit (130) such that the light intensity is constant Furthermore, a magnetic field measuring apparatus of the present invention is characterized in having: one sensor unit that passes therethrough light outputted from a light source unit: and a signal control processor that eliminates the light intensity fluctuation on the basis of two lights passed through the sensor unit.