Measuring Device for Weak Electromagnetic Signals of a Sample at Low Frequencies and Method Therefor

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This invention relates to a measuring device and method optimized for detecting weak electromagnetic signals from small samples at low frequencies (1 kHz to 40 MHz). The device uses a low-quality pick-up coil but couples it with a high-quality resonant circuit comprising a filter coil and tunable capacitance, both with very high Q-factors. This configuration, enhanced by improved shielding and optimized wiring, achieves a high signal-to-noise ratio, making it suitable for precise measurements even with tiny samples and without bulky superconducting magnets.

Use CasesContent extracted from patent full text and abstract with AI.

• Portable Nuclear Magnetic Resonance (NMR) spectroscopy for chemical analysis in the field or laboratory.
• Portable Electron Spin Resonance (ESR/EPR) spectroscopy for material science and biological studies.
• Miniaturized diagnostic devices for biomedical applications (e.g., analyzing small-volume biological samples).
• Sensor technology for detecting magnetic nanoparticles in research, diagnostics, or industrial settings.
• Quality control in materials science, detecting weak magnetic or electromagnetic signatures of samples.
• Educational tools for physics and chemistry labs using compact, affordable equipment.

BenefitsContent extracted from patent full text and abstract with AI.

• High signal-to-noise ratio at low frequencies allows detection of very weak signals.
• Sensitive detection possible for small sample volumes, enabling micro-scale measurements.
• Significantly reduced equipment size and complexity by eliminating the need for superconducting magnets.
• Improved flexibility and robustness, suitable for portable and field-deployable devices.
• Lower cost and energy consumption, making these devices accessible and battery-powered.
• Design enables miniaturization, ideal for lab-on-a-chip and mobile instrumentation applications.
• Adaptable to a wide frequency range and different sample types, increasing versatility.

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Patent Abstract

The invention relates to a measuring apparatus for detecting weak electromagnetic signals from a sample at low frequencies, specifically in the frequency range of 1 kHz - 10 MHz, in particular, and to a measuring method. The problem addressed by the invention is that of providing an apparatus which can be used to detect weak electromagnetic signals from a sample, in particular in the frequency range of 1 kHz - 40 MHz, with a good signal-to-noise ratio. For the solution, the measuring apparatus comprises an electromagnetic resonant circuit having a pick-up coil of low quality, a preferably tunable capacitance and a filter coil; the filter coil and the capacitance have a high quality of at least 100, advantageously at least 200, particularly preferably at least 500. Alternatively or additionally, the quality of the resonant circuit is at least 100, advantageously at least 200, particularly preferably at least 500. The quality of the filter coil and the quality of the capacitance exceed the quality of the pick-up coil, specifically at least by twice the amount. The measurement signal is then available at the two ends of the filter coil with a good signal-to-noise ratio.