A dielectric spectroscopic measurement apparatus includes a first probe, a second probe, and a measurement instrument. The first probe includes a coaxial line and has opened one end as a detection end. The second probe includes a coaxial line and has opened one end as a detection end. Further, the second probe has a longer penetration length than the first probe. The measurement instrument determines a permittivity of a second medium from a result of a measurement of a measurement object using the first probe and a result of a measurement of the measurement object using the second probe.

The present invention relates generally to the field of disposable assay test devices, particularly for use in point-of-care assays. The invention further relates to the use of such devices, including kits comprising such devices, to facilitate the accurate measurement of the levels of sepsis in the blood using electronic measurements.

The invention discloses an impedance spectrum in-situ measuring device for the dielectric constant of solid materials at high temperature and high pressure conditions. The device comprises a cube-shaped pyrophyllite, a cylindrical opening penetrates between one end face of the pyrophyllite and the other end face opposite to the end face; a heater formed by sleeving annular stainless steel sheets is arranged in the opening; a first plate-shaped platinum electrode and a second plate-shaped platinum electrode are arranged in the cavity of the innermost ring-shaped stainless steel sheet. The first plate-shaped platinum electrode is electrically connected with one end of the Solartron 1260 Impedance/Gainphase Analyzer through a first lead, and the second plate-shaped platinum electrode is electrically connected with the other end of the Solartron 1260 Impedance/Gainphase Analyzer through a second lead. Several layers of machinable alumina fillers are filled between the sample of the solid material to be measured and the innermost annular stainless steel sheet. The device also comprises a first cylindrical plug and a second cylindrical plug. The device can be considered as a useful tool in study on the properties of the dielectric constant of the solid material to be measured at high temperature and high pressure conditions.

Arrangement for detecting water in a material flow during drilling, wherein the arrangement includes a control unit, a data acquisition unit and a sensor, wherein the sensor includes at least two probes, wherein the at least two probes are to be arranged in contact with the material flow and are connected to a programmable voltage source and a programmable voltage receiver. The arrangement is configured tomeasure a ratio between a received voltage waveform and an applied voltage waveform for a set of pre-determined frequencies; determine a complex impedance between the at least two probes for each of the pre-determined frequencies, based on the measured ratio; and determine a set of time mean values of the determined complex impedance for each of the pre-determined frequencies, using a time window.

The present application relates to a sensing method that is carried out using an electrode that comprises an electrode substrate functionalised with sensing elements. The method involves conducting electrochemical impedance spectroscopy at a plurality of applied voltages and then integrating measurement data as a function of voltage. Also provided is an apparatus for carrying out the sensing method. The method and apparatus are suitable for a broad range of sensing applications, including the detection of diagnostic biomarkers, drug screening, development of glycoarray systems and the sensing of environmental parameters such as light intensity, temperature and humidity.

An electrochemical ion sensor and a method for sensing a presence of at least one ion species in a solution are provided. The electrochemical sensor includes a solid-state electrolyte medium doped with an organometallic material, having an electrochemical affinity with the ion species, and a pair of electrodes electrically contacting the solid-state electrolyte. The electrochemical sensor also includes an electrical circuit configured to drive the pair of electrodes with an AC electrical excitation and to measure at least one parameter related to a complex electrical impedance of the doped solid-state electrolyte medium in response to the AC electrical excitation. The parameter may be an electrical resistance, an inductance or a combination of both, and represents the presence of the ion species in the solution when the solid-state electrolyte medium is exposed to the solution.

A sensing system for monitoring an industrial fluid is presented. The sensing system includes a housing and a sensor probe disposed at least partially in the housing, where the sensor probe includes a substrate, a sensing region disposed on the substrate, a first coil disposed on the substrate and coupled to the sensing region, and a second coil disposed on the substrate and coupled to the first coil. A method for operating the sensing system is also presented.

Various aspects of the disclosure relate to evaluating the electromagnetic impedance characteristics of a material under test (MUT) over a range of frequencies. In particular aspects, a system includes: an electrically non-conducting container sized to hold the MUT, the electrically non-conducting container having a first opening at a first end thereof and a second opening at a second, opposite end thereof; a transmitting electrode assembly at the first end of the electrically non-conducting container, the transmitting electrode assembly having a transmitting electrode with a transmitting surface; and a receiving electrode assembly at the second end of the electrically non-conducting container, the receiving electrode assembly having a receiving electrode with a receiving surface, wherein the receiving electrode is approximately parallel with the transmitting electrode, and wherein the transmitting surface of the transmitting electrode is larger than the receiving surface of the receiving electrode.

Certain disclosed methods include: transmitting an excitation signal into the MUT and transmitting a reference signal to a set of magnitude and phase (M/P) detectors; receiving the response signal; separately comparing a magnitude and phase for each of the excitation signal and the reference signal with corresponding detection ranges for a first one of the M/P detectors; separately comparing a magnitude and phase for each of the response signal and the reference signal with corresponding detection ranges for a second one of the M/P detectors; iteratively adjusting the excitation signal until the response signal has both a magnitude and a phase within the corresponding detection ranges for the second M/P detector; and iteratively adjusting the reference signal until the reference signal has both a magnitude and a phase within the corresponding detection ranges for the first and the second M/P detectors.

Electrochemical Impedance Spectroscopy (EIS) is used in conjunction with continuous glucose monitors and continuous glucose monitoring (CGM) to enable in-vivo sensor calibration, gross (sensor) failure analysis, and intelligent sensor diagnostics and fault detection. An equivalent circuit model is defined, and circuit elements are used to characterize sensor behavior.