Split-ring resonator with interdigital Split electrodes as detector for liquid and ion chromatography

Dehning, Kirsten J.; Hitzemann, Moritz; Zimmermann, Stefan

doi:10.1016/j.sbsr.2024.100645

Cited by 1 publication

(2 citation statements)

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“…Resonators, such as split-ring resonators [1][2][3][4][5][6][7][8][9][10][11][12], are widely used in sensor applications to detect even the slightest changes in ambient conditions. The characteristic parameters of a resonator, namely its resonant frequency, the damping at resonance and its quality factor, can be measured using a vector network analyzer (VNA).…”

Section: Introductionmentioning

confidence: 99%

“…Using SRRs as detectors in high-performance liquid chromatography (HPLC) and ion chromatography (IC) requires rapid sensor response and thus new concepts capable of fast, accurate and continuous tracking of the resonator's characteristics. In this case, a response time of 1 s or less is required to capture the narrow peaks eluting from the chromatographic column [8,9,17]. The same applies for various other applications, where SRRs are employed as sensing elements, e.g., fast analysis of liquids [2,4,7], the detection of biomarkers [5,6] and the identification of defects and cracks in metal objects [3].…”

Section: Introductionmentioning

confidence: 99%

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Continuous Recording of Resonator Characteristics Using Single-Sideband Modulation

Lippmann,

Hitzemann,

Hermeling

et al. 2024

Electronics

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Electrical resonators are usually characterized by their resonance frequency, attenuation and quality factor. External quantities can affect these parameters, resulting in a characteristic change in the resonator, which can be used as a sensor effect. This work presents a new concept and electronic device for the continuous recording of resonator characteristics using single-sideband modulation. A test signal consisting of a center frequency and two sidebands is generated and the center frequency is set close to the resonator’s resonance frequency while the two sidebands are adjusted symmetrically around the center frequency. By exiting the resonator with the test signal and demodulating the resulting output into individual frequency components, a continuous measurement of the attenuation is possible. The center frequency is adjusted so that both sidebands have equal attenuation, resulting in a center frequency that corresponds to the resonance frequency of the resonator. If the resonator does not show a symmetrical frequency response, the sideband attenuation ratio can be adjusted accordingly. Continuous recording of the resonator characteristics at a sampling rate of 100 Sps was verified using a digitally tunable RLC series resonator with resonance frequencies between 250 MHz and 450 MHz, resulting in a maximum error below 1.5%.

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