Nuclear Magnetic Flowmeter Pulse Duration Determination
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Solution Overview
Problem
Current nuclear magnetic measuring methods require a lengthy measuring series to determine the pulse duration T90 for a 90° pulse, which is inefficient.
Innovation Solution
The method involves setting the matching and tuning capacitances to match the angular resonance frequency with the Larmor frequency, determining the coil resistance, and calculating the pulse duration T90 using equations based on circuit topology and constants, allowing for power matching and efficient torque application on magnetic moments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lengthy measuring series is used to determine the pulse duration T90, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing constants A, B, C, D, and E that are derived from the circuit topology and component characteristics. These constants are stored in a database before actual measurements, so that during operation, the pulse duration T90 can be quickly determined using the pre-prepared equation T90 = sqrt(A + B/RL + C/RL^2 + D/RL^3 + E/RL^4) without requiring lengthy measuring series, thus reducing measurement time while maintaining precision
Solution Approach 2:
The patent creates a mathematical model (copy) of the physical system by deriving an equation that relates pulse duration T90 to coil resistance RL through pre-calculated constants. This mathematical copy allows rapid calculation of T90 based on measured RL values, eliminating the need for time-consuming direct measurement series while preserving measurement accuracy
2Use of energy by moving object
If power matching is optimized between signal generator and coil, then use of energy is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by adjusting the matching capacitor capacitance CM and tuning capacitor capacitance CT to optimize power transfer between the signal generator and coil. By varying these capacitive parameters, the system achieves impedance matching and maximizes power efficiency without requiring complex active control circuits, thus balancing energy efficiency with device simplicity
Solution Approach 2:
The patent introduces matching and tuning capacitors as intermediary elements between the signal generator and the coil. These capacitors act as mediators that facilitate optimal power transfer by adjusting the impedance characteristics of the circuit, enabling efficient energy transfer while maintaining a relatively simple circuit architecture
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 significantly reduces the time needed to determine the pulse duration T90, enabling faster nuclear magnetic measurements by optimizing power transfer and torque application.
Implementation Method 1
The circuit arrangement has an angular resonance frequency ω0... setting the matching capacitance CM and the tuning capacitance CT so that the angular resonance frequency ω0 corresponds to the angular Larmor frequency ωP
Implementation Method 2
The coil has a coil impedance ZL with a coil resistance RL and a coil reactance XL... The medium is magnetized by a magnetic field for the nuclear magnetic measuring method
Implementation Method 3
In the presence of a magnetic field, the vector of the magnetic moment of the atomic nucleus tends to be aligned parallel to the vector of the magnetic field at the location of the atomic nucleus. Thereby, the vector of the magnetic moment precesses around the vector of the magnetic field at the location of the atomic nucleus. The precession is known as Larmor precession.
Data Source
AI summary
A method for determining a pulse duration T90 of a 90° pulse in a nuclear magnetic measuring method. A signal generator has a known generator resistance RS, wherein a coil has a coil impedance ZL with a coil resistance RL and a coil reactance XL, wherein a coupling circuit has an adjustable matching capacitance CM and an adjustable tuning capacitance CT, and wherein the medium has a Larmor precession having an angular Larmor frequency ωP. The time needed for determining the pulse duration T90 of the 90° pulse is reduced by the matching capacitance CM and the tuning capacitance CT being set so that the angular resonance frequency ω0 corresponds to the angular Larmor frequency ωP and by power matching being present between the signal generator and the coil. The coil resistance RL is determined and the pulse duration T90 is determined as a function of the coil resistance RL.