An air temperature sensing apparatus and a system for an aircraft includes an ejector with a first air duct for receiving a first air flow from an aircraft air distribution duct, the first air duct defining a first cross-sectional area, a second air duct for receiving a second air flow from a passenger compartment of the aircraft, the second air flow merging with the first air flow downstream of the second air duct, and a restrictor connected to the first air duct defining a minimal cross-sectional area. The apparatus and system also include a temperature sensor in fluid communication with the second air flow. The minimal cross-sectional area of the restrictor is smaller than the first cross-sectional area of the first air duct to create a region of low pressure within the ejector, causing the second air flow to be suctioned over the temperature sensor.

An air temperature sensing apparatus and a system for an aircraft includes an ejector with a first air duct for receiving a first air flow from an aircraft air distribution duct, the first air duct defining a first cross-sectional area, a second air duct for receiving a second air flow from a passenger compartment of the aircraft, the second air flow merging with the first air flow downstream of the second air duct, and a restrictor connected to the first air duct defining a minimal cross-sectional area. The apparatus and system also include a temperature sensor in fluid communication with the second air flow. The minimal cross-sectional area of the restrictor is smaller than the first cross-sectional area of the first air duct to create a region of low pressure within the ejector, causing the second air flow to be suctioned over the temperature sensor.

The invention relates to a marker device and a tracking system for tracking the marker device, wherein the marker device comprises a rotationally oscillatable magnetic object and wherein the rotational oscillation is excitable by an external magnetic field, i.e. a magnetic field which is generated by a magnetic field providing unit 20, 31 that is located outside of the marker device. The rotational oscillation of the magnetic object induces a current in coils, wherein based on these induced currents the position and optionally also the orientation of the marker device is determined. This wireless kind of tracking can be carried out with relatively small marker devices, which can be placed, for instance, in a guidewire, the marker devices can be read out over a relatively large distance and it is possible to use a single marker device for six degrees of freedom localization.

The invention relates to a marker device and a tracking system for tracking the marker device, wherein the marker device comprises a rotationally oscillatable magnetic object and wherein the rotational oscillation is excitable by an external magnetic field, i.e. a magnetic field which is generated by a magnetic field providing unit 20, 31 that is located outside of the marker device. The rotational oscillation of the magnetic object induces a current in coils, wherein based on these induced currents the position and optionally also the orientation of the marker device is determined. This wireless kind of tracking can be carried out with relatively small marker devices, which can be placed, for instance, in a guidewire, the marker devices can be read out over a relatively large distance and it is possible to use a single marker device for six degrees of freedom localization.

A soil moisture and fertility sensor system is presented that includes an elongated probe having a plurality of sensor modules positioned along the length of the probe. Each sensor module includes a co-located sensors configured to take a moisture, temperature, and fertility measurements at varying depths of the soil. The probe is configured for wireless communication. The probe is configured to take moisture measurements, temperature measurements and/or nutrient measurements at different times so as to prevent interference between measurements. The probe includes a plurality of receptacles that receive the fertility sensor assembly cartridge that may be inserted into and removed from a receptacle so as to facilitate end-of-life replacement. In one arrangement, the fertility sensor assembly includes a reference sensor and a plurality of nutrient sensors that are each configured to sense the presence of a specific nutrient.

A sealed sensor device (104) comprising: an internal atmosphere comprising a gas pressurised to a predetermined pressure, the predetermined pressure being below atmospheric pressure when the internal atmosphere is hermetically sealed from ambient. A sensor cavity (214) is also provided having a periphery and is in fluid communication with the internal atmosphere, thereby comprising the gas and the gas having a mean free path at the predetermined pressure associated therewith. A thermopile (256) is disposed in the sensor cavity (214) for detecting a change in pressure of the internal atmosphere and detecting failure of the hermetic seal. A membrane structure (234) disposed within the cavity comprises the thermopile (256). The membrane structure (234) also comprises a heating element, and a shortest distance from substantially any point on the membrane structure (234) to the periphery of the sensor cavity (214) is less than the mean free path of the gas at the predetermined pressure.

A sealed sensor device (104) comprising: an internal atmosphere comprising a gas pressurised to a predetermined pressure, the predetermined pressure being below atmospheric pressure when the internal atmosphere is hermetically sealed from ambient. A sensor cavity (214) is also provided having a periphery and is in fluid communication with the internal atmosphere, thereby comprising the gas and the gas having a mean free path at the predetermined pressure associated therewith. A thermopile (256) is disposed in the sensor cavity (214) for detecting a change in pressure of the internal atmosphere and detecting failure of the hermetic seal. A membrane structure (234) disposed within the cavity comprises the thermopile (256). The membrane structure (234) also comprises a heating element, and a shortest distance from substantially any point on the membrane structure (234) to the periphery of the sensor cavity (214) is less than the mean free path of the gas at the predetermined pressure.

A sensor sheet is manufactured by forming a conductive heat-sensitive material 5 over first wiring electrodes 3a and forming second wiring electrodes 4a over the conductive heat-sensitive material 5. For this reason, no adhesion surface (boundary surface), which is formed when adhesion is performed later, exists between the first wiring electrode 3a and the conductive heat-sensitive material 5 and between the conductive heat-sensitive material 5 and the second wiring electrodes 4a.

The present disclosure proposes the placing of temperature sensors embedded in the power semiconductor device. In this, at least one of the embedded temperature sensors is placed within or close to the heat source, active areas or channels of the power semiconductor circuit, and at least one of the embedded temperature sensors is placed more apart from the heat source, active areas or channels of the power semiconductor circuit. Furthermore, a new the temperature measurement method is provided, with timing of the temperature measurement and adjusting measurement parameters to appropriate threshold values.

A pressure sensing unit comprises a membrane and two permanent magnets inside the cavity. One magnet is coupled to the membrane, and at least one magnet is free to oscillate with a rotational movement. At least one magnet is free to oscillate with a rotational movement. The oscillation takes place at a resonance frequency, which is a function of the sensed pressure, which pressure influences the spacing between the two permanent magnets. This oscillation frequency can be sensed remotely by measuring a magnetic field altered by the oscillation. The pressure sensing unit may be provided on a catheter or guidewire.