Optically Pumped Magnetometer Kicker Pulse Start-Up
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Solution Overview
Problem
Self-oscillating atomic/nuclear magnetometers face long start-up times and operational deficiencies in environments with high local gradients and strong transient fields, leading to unsuitable magnetometer output for precision measurements in mobile geophysical surveying applications.
Innovation Solution
A method and apparatus that include a vapor cell with a light source and detector, where a short kicker pulse is applied to initiate oscillation within one cycle of the Larmor frequency, reducing start-up time and enabling rapid magnetic field measurement, using either an RF or optical pulse to facilitate early start-up and maintain oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional optically pumped magnetometer operation is used, then the magnetometer can achieve stable oscillating signal, but the start-up time is excessively long making it unsuitable for mobile geophysical surveying
Solution Approach 1:
The patent applies preliminary action by using a kicker pulse to pre-initialize the magnetometer system before normal operation. The kicker pulse prepares the vapor cell and optical system in advance, creating optimal conditions for rapid oscillation start-up. This preliminary initialization reduces the time required to reach stable oscillating state from conventional delays to just 10 microseconds, while maintaining operational reliability through the established feedback control mechanism.
Solution Approach 2:
The patent implements periodic action through the use of kicker pulses applied at specific intervals or triggers. Rather than continuous operation, the system uses periodic kicker pulses to maintain or re-initiate oscillation when needed. This periodic intervention allows the system to achieve rapid recovery and start-up times while consuming energy only when necessary, resolving the contradiction between fast response and stable operation.
2Adaptability or versatility
If the magnetometer operates in environments with high local gradients and strong transient fields, then it can handle challenging measurement conditions, but the output becomes unsuitable for precision measurements
Solution Approach 1:
The patent applies dynamics by making the magnetometer system adaptive to changing environmental conditions. The feedback control mechanism continuously monitors the oscillating signal and adjusts system parameters in real-time to compensate for high local gradients and transient fields. This dynamic adjustment allows the system to maintain measurement precision across varying environmental conditions, achieving both environmental adaptability and measurement accuracy simultaneously.
Solution Approach 2:
The patent implements feedback control to maintain measurement precision in challenging environments. The system continuously monitors the oscillating signal output and uses this feedback to adjust operating parameters, compensate for environmental disturbances, and maintain optimal performance. This feedback mechanism enables the magnetometer to adapt to high local gradients and transient fields while preserving the quality and precision of measurements, resolving the contradiction between environmental versatility and measurement accuracy.
3Productivity
If a kicker pulse is applied to reduce start-up time, then the oscillation can begin within one cycle of Larmor frequency, but additional system components are required
Solution Approach 1:
The patent applies universality by designing the kicker pulse generation circuitry to serve multiple functions within the magnetometer system. The same or integrated circuits generate both the kicker pulses for rapid start-up and the feedback control signals for stable operation. This multi-functionality reduces the need for separate dedicated components, minimizing the increase in device complexity while achieving the productivity benefit of 10-microsecond start-up time and one-cycle oscillation initiation.
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 significantly reduces the start-up time of optically pumped magnetometers to 10 microseconds, allowing for consistent operation at 500 Hz with a 50% duty cycle and enabling precise magnetic field measurements in challenging environments.
Implementation Method 1
An optically pumped magnetometer measures the Larmor precession frequency of a vapor sample of spin polarized atoms
Implementation Method 2
measures the Larmor precession frequency of a vapor sample of spin polarized atoms in an external magnetic field
Implementation Method 3
modulating the light injected into the vapor cell in dependence on the detected output to achieve an oscillating signal
Data Source
AI summary
A method and system that includes injecting light into a vapor cell; detecting an output of the light from the vapor cell; modulating the light injected into the vapor cell in dependence on the detected output to achieve an oscillating signal; applying an energy pulse to the vapor cell prior to achieving the oscillating signal to decrease a time required to achieve the oscillating signal; and determining a magnetic field measurement in dependence on a frequency of the oscillating signal.