Labview index of ring menu1/4/2023 ![]() Depending on the different compound properties, the detection principles can be divided into light-based detectors (such as fluorescence, absorption, refraction, and scattering) and resistive detectors. This wide variety of applications pose special challenges for the detectors used, which have to detect multiple types of substances. The use of liquid chromatography (LC), e.g., high performance/pressure liquid chromatography (HPLC) and ion chromatography (IC), for the physical separation of compounds in a liquid phase is used in a wide variety of applications such as food, drug, and environmental analysis process monitoring in the chemical industry and even bioreactors. Here, the dielectric characterization of liquids inside a capillary is of particular interest. This effect makes split-ring resonators increasingly attractive for various applications, such as (bio)chemical sensors for the detection of biomarkers in medical applications and the dielectric characterization of thin films and liquids. Split-ring resonators (SRR) significantly shift their resonance frequency even with the smallest change in split capacitance, and thus in permittivity, dielectric losses, and conductivity of the split capacitor’s dielectric. Finally, a chromatogram of one sugar (glucose) and one sugar alcohol (xylitol) is recorded using the SRR and is compared to a standard refractive index detector. Thus, a minimum change in permittivity of Δε r,min = 11.26 × 10 −3 can be detected. Our simple low-cost electronics enables an average sampling rate of 42 Hz with 128 averages of the demodulated signal and has a frequency stability of 840 mHz. The demodulated signal changes its amplitude depending on the shift of the resonance frequency. The proposed method is based on the detection of the transmitted signal at a single frequency that is analyzed by demodulation. Here, we present a new capillary split-ring resonator CaSRR with fast readout for liquid chromatography (LC), which is capable of accurately detecting very fast changes in split capacity. Usually, the resonance frequency is derived from the frequency response, but recording the frequency spectrum takes a certain amount of time. ![]() ![]() Split-ring resonators (SRR) are simple electrical circuits that show a significant shift in resonance frequency even with the smallest changes in split capacitance, and thus in permittivity, electric conductivity, and dielectric losses of the split capacitor’s dielectric. ![]()
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