A method and a device for calibrating a measuring device configured to measure a liquid (MX) comprising colloidal particles. A calibrating function is selected among a plurality of fitting functions. A group of fitting functions are constructed by utilizing different combinations of measurement data. The calibration function is the one with the smallest maximum error.

A system for detecting disposal of metallic objects into an opening of a medical waste container, including: an indicator for indicating passage of metallic objects through the opening, a pair of receive coils and a transmit coil spaced therebetween shaped for receiving waste therethrough adjacent to the opening, and a controller in electrical communication with the coils. The controller generates and communicates a transmit signal to the transmit coil, which generates a magnetic field that induces voltage in each of the receive coils, which each generate a receive signal. The controller generates a waveform based on the receive signals with a baseline corresponding to absence of metallic objects, and analyzes the waveform with respect to opposite first and second thresholds. The controller activates the indicator in response to metallic objects passing through the coils when the waveform first exceeds the first threshold and then subsequently exceeds the second threshold.

A system for detecting disposal of metallic objects into an opening of a medical waste container, including: an indicator for indicating passage of metallic objects through the opening, a pair of receive coils and a transmit coil spaced therebetween shaped for receiving waste therethrough adjacent to the opening, and a controller in electrical communication with the coils. The controller generates and communicates a transmit signal to the transmit coil, which generates a magnetic field that induces voltage in each of the receive coils, which each generate a receive signal. The controller generates a waveform based on the receive signals with a baseline corresponding to absence of metallic objects, and analyzes the waveform with respect to opposite first and second thresholds. The controller activates the indicator in response to metallic objects passing through the coils when the waveform first exceeds the first threshold and then subsequently exceeds the second threshold.

A surface property evaluation method includes a measurement step for acquiring the distribution of impedance in the depth direction of a test piece, and an evaluation step for evaluating the surface treatment state in the depth direction and wherein the evaluation step includes: a step for creating a reference measurement value group by preparing untreated sample, good sample, and sample to be evaluated, and calculating an impedance ratio γ1 at each frequency for the untreated sample and good sample impedances; a step for creating an evaluation measurement value group by calculating an impedance ratio γ2 for the impedances of untreated sample at each frequency relative to the sample to be evaluated impedances; and a step for evaluating the surface treatment state of a sample to be evaluated by comparing a reference measurement value group with the evaluation measurement value group.

A radio frequency signaling system includes a curable coating composition configured to be cured to form a cured coating and a sensor received in the curable coating composition. The sensor includes circuitry forming an inductor-capacitor circuit. The circuitry has a maximum outer diameter of 10 μm-2.0 mm. The circuitry is configured to generate an electromagnetic field in response to an external radio frequency signal. A container configured to be monitored by a radio frequency signaling system is also provided. The container includes: a container body having an outer surface and an inner surface; a cured coating on the inner surface and/or the outer surface of the container body; and a sensor positioned in the cured coating configured to detect absorption of a fluid contained in the container body by the cured coating.

The invention relates to a measuring arrangement and to a method for the inductive analysis of metal objects, comprising a coil arrangement having an excitation coil (1.1) that can be excited by means of an excitation current, and at least one receiver coil (1.2), said two coils being inductively coupled to one another. By means of an evaluation unit, an output signal (5.4) of the measuring arrangement is evaluated. Means for generating a ramp-shaped voltage signal of the excitation voltage (2.5) as a specification for a ramp-shaped current through the excitation coil are provided. A control device regulates the current at the base point of the excitation coil (1.1) such that a ramp-shaped excitation current is produced, which is modulated by the metal object (1.6), and which affects the change in the excitation voltage. Thus, an inductive analysis or detection method is provided, in which temperature influences on the coil system have no effect at all, and which, moreover, allows a spectral analysis of the inductive properties of the metal to be analyzed in a wide frequency range.

A system and method for monitoring a characteristic of a material by measuring electrical or magnetic properties of the material. The system includes a material monitoring device having at least one electrode and at least one magnetic coil, and is in communication with a machine learning model trained to recognize characteristics of the material based on electrical and magnetic properties of the material. The material can be stimulated with an electrical stimulus or stimulating magnetic field, and an electrical response signal or magnetic response signal can be measured. Applications to monitoring water quality, beverages, foodstuffs, and other characteristics of materials is discussed.

Provided are a method and a device capable of: generating a first alternating current magnetic field passing through a chamber having a cell disposed therein, by using a plurality of primary coils arranged on a first plane; receiving a second alternating current magnetic field by using a plurality of secondary coils arranged on a second plane; and measuring an impedance change of a cell by using the first alternating current magnetic field and the second alternating current magnetic field.

Disclosed a passive wireless sensor for detecting discrete droplets and bubbles. A first inductor channel and a second inductor channel are disposed opposite each other to form a capacitor channel, the first inductor channel is connected to the second inductor channel to form a resonant circuit. When a detection object passes through the detection channel, the permittivity between the first inductor channel and the second inductor channel changes and consequently a capacitance value of the capacitor channel changes, thus resulting in a change in resonant frequency of the resonant circuit. A readout device is used to read the resonant frequency of the resonant circuit and perform detection according to the resonant frequency to obtain information of a corresponding detection object.

Disclosed a passive wireless sensor for detecting discrete droplets and bubbles. A first inductor channel and a second inductor channel are disposed opposite each other to form a capacitor channel, the first inductor channel is connected to the second inductor channel to form a resonant circuit. When a detection object passes through the detection channel, the permittivity between the first inductor channel and the second inductor channel changes and consequently a capacitance value of the capacitor channel changes, thus resulting in a change in resonant frequency of the resonant circuit. A readout device is used to read the resonant frequency of the resonant circuit and perform detection according to the resonant frequency to obtain information of a corresponding detection object.