A device for determining the partial pressure or the concentration of a steam in a volume, includes a sensor body that can be oscillated. The temperature of the sensor body can be controlled to a temperature below the condensation temperature of the steam, and the oscillation frequency of the sensor body is influenced by a mass accumulation of the condensed steam on a surface of the sensor body. Means are provided for generating a gas flow from the sensor surface in the direction of the volume through a steam transport channel that adjoins a window to the volume. In order to increase the maximum service life of the sensor body, the means for generating a gas flow has a slit nozzle designed as an annular channel.

A device for determining the partial pressure or concentration of a vapor in a volume includes a sensor element that can be caused to oscillate and temperature-controlled to a temperature below the condensation temperature of the vapor. The sensor element has an oscillation frequency that is influenced by a mass accumulation formed by condensed vapor on the sensor surface thereof. The rear side of the sensor element pointing away from the sensor surface contacts a thermal transfer surface of a thermal transfer element. The thermal transfer element is formed from an electrically heatable heating element that is connected to a cooling element in a thermally conductive manner by a thermal dissipation surface, which is different from the thermal transfer surface. The thermal transfer surface extends substantially parallel to the thermal dissipation surface.

A system for measuring a gas concentration, the system including: a first oscillator including a first surface for placement in a sampling location, wherein the first oscillator oscillates at a frequency greater than 20,000 Hz but less than 300,000,000 Hz; a first counter to accumulate a count of oscillations of the first oscillator; and a comparator to calculate a difference between the accumulated counts of the first oscillator and a reference, wherein the difference calculated by the comparator is sampled at a frequency of less than 100 Hz.

Acoustic ambient temperature and humidity sensing based on determination of sound velocity is described, in addition to sensors, algorithms, devices, systems, and methods therefor. An exemplary embodiment employs sound velocity in the determination of ambient temperature and humidity. Provided implementations include determinations of sound velocity based on time of flight of a coded acoustic signal and/or based on resonance frequency of a Helmholtz resonator.

A method for identifying a road condition, in which a piece of road condition information representing the road condition is determined using a front end air moisture value representing an air moisture at a front end of a vehicle and a rear end air moisture value representing an air moisture at a rear end of the vehicle.

A sensor arrangement and method for measuring the speed of sound in a gas to determine gas characteristics, such as composition, temperature and/or humidity of the gas. The sensor arrangement includes a sound sender, first and second sound receivers, and a signal processing unit. The sound sender and sound receivers are arranged such that the travel distance of the sound provided by the sender to the first receiver is different from the travel distance of the sound provided by the sender to the second receiver. Further the arrangement includes the signal processing unit connected with the sender and the receivers which operates to determine the gas characteristics.

A device and method are provided for detecting analyte with correction for the effects of humidity. The device comprises a resonant sensor having an oscillating portion. A capacitor is positioned on the oscillating portion. The capacitor is formed by at least two electrodes and a sensing material positioned between the electrodes. A readout circuit is arranged to measure a response of the oscillating portion (e.g., frequency shift or change in resonance frequency, stiffness or strain) and a capacitance of the capacitor when substances are adsorbed or absorbed in the sensing material. This combination of measurements enables the device to distinguish between various types of adsorbed or absorbed molecules, especially distinguishing between an analyte of interest and water molecules that might interfere with the detection of the analyte. A processor determines an analyte value indicative of the presence, amount or concentration of the analyte in dependence upon measurements of both the response of the oscillating portion and the capacitance to account for the effects of water in the sensing material.

A detection device includes a first antenna configured to receive a first radio wave transmitted from an external device, a second antenna configured to receive the first radio wave transmitted from the external device, and transmit a second radio wave to the external device; and a chip configured to obtain a comparison result between a first electromotive force generated by the first radio wave received by the first antenna and a second electromotive force generated by the first radio wave received by the second antenna, and to send the comparison result to the external device through the second radio waive. When the first antenna is disposed closer than the second antenna to a place where the existence of moisture is to be detected, a change of the first electromotive force is greater than a change of the second electromotive force in response to the existence of moisture.

A system for calibrating a moisture sensor encompasses a processing unit (341). The processing unit (341) includes a reference data obtaining LCKT (345), a subject data obtaining LCKT (346) and a relationship calculating LCKT (347). The reference data obtaining LCKT (345) obtains reference data, after injecting water-vapor with known concentrations into an analyzer. The subject data obtaining LCKT (346) measures subject data indicating temporal variation of output-responses of a subject sensor element of the analyzer under test. The relationship calculating LCKT (347) compares the subject data with the reference data, and calculates relationships between the output-responses of the subject sensor element and the known concentrations.

An environmental parameter sensor for a mobile device is described comprising a first acoustic transducer; a second acoustic transducer arranged at a predetermined distance from the first acoustic transducer; a controller coupled to the first acoustic transducer and the second acoustic transducer; wherein the controller is configured to determine at least one of a time-of-flight value and an attenuation value of an acoustic signal between the first acoustic transducer and the second acoustic transducer and to determine at least one environmental parameter from the at least one of the time-of-flight value and the attenuation value The environmental parameter sensor may determine environmental parameters such as temperature, wind speed, and humidity from acoustic measurements.