Frequency Hopping Spectroscopy Avoiding Molecular Saturation

The excitation power is segmented across multiple frequency channels rather than concentrated at a single frequency. The frequency-hopping spread spectrum technique divides the total power into N frequency components, each delivering a fraction of the total power to the sample. This segmentation allows the system to achieve high total power delivery while keeping individual frequency power levels below saturation thresholds, thereby improving measurement sensitivity without causing transition saturation.

The frequency-hopping spread spectrum technique maintains continuous useful action by rapidly hopping through multiple frequency channels within the dephasing time of the molecular transitions. The excitation source continuously delivers power across the broadband spectrum, ensuring that each frequency component receives sufficient power density during its active period while the overall system achieves broad spectral coverage. This continuous action across multiple frequencies resolves the contradiction between spectral coverage and power density.

The patent replaces expensive arbitrary waveform generators with a more economical frequency-hopping approach using standard microwave sources and frequency synthesizers. Instead of using complex, costly waveform generation equipment, the system employs simpler, more affordable frequency-hopping circuitry that achieves similar spectral excitation effects. This substitution of cheaper components while maintaining functional performance directly addresses the contradiction between pulse shaping flexibility and system cost.