A device for detecting critical states of a surface, in which at least one hermetically sealed sensor for detecting critical states of a surface, one system for energy supply and one device for data transfer with an at least partially flexible, thin carrier plate are mechanically connected, and said carrier plate is arranged on the surface to be observed.

A refrigerator that has a fresh food compartment, a freezer compartment, and a door that provides access to the fresh food compartment is disclosed. An icemaker is mounted remotely from the freezer compartment. The icemaker includes an ice mold with an icemaking cycle having a liquid to ice phase change. A thermoelectric device has a cold side and a warm side. A controller is in operable communication with an input to the thermoelectric device. A sensor is in operable communication with the input to the thermoelectric device and the controller. A feedback response from the input to the thermoelectric device monitors the liquid to ice phase change of the icemaking cycle.

A method of detecting that an aircraft is flying in icing conditions. A processor unit determines a real power developed by the turboshaft engine and a theoretical power that the engine can develop in theory, the theoretical power being determined using a theoretical model supplying a power as a function at least of a speed of rotation of a gas generator of the engine. The processor unit determines a difference between the real power and the theoretical power. The processor unit generates a warning to indicate the presence of icing conditions when the power difference is greater than a predetermined power threshold for a length of time longer than a time threshold, and when a temperature outside the aircraft lies between a low temperature threshold and a high temperature threshold.

A method of detecting that an aircraft is flying in icing conditions. A processor unit determines a real power developed by the turboshaft engine and a theoretical power that the engine can develop in theory, the theoretical power being determined using a theoretical model supplying a power as a function at least of a speed of rotation of a gas generator of the engine. The processor unit determines a difference between the real power and the theoretical power. The processor unit generates a warning to indicate the presence of icing conditions when the power difference is greater than a predetermined power threshold for a length of time longer than a time threshold, and when a temperature outside the aircraft lies between a low temperature threshold and a high temperature threshold.

A device and method for measuring ice thickness on a first surface of a construction element. The device includes a sensor arrangement arranged in connection with the construction element and arranged to provide signals related to an impedance. A processing unit is coupled to the sensor arrangement and arranged to determine the presence of ice based on the provided impedance signals. A reference sensor arrangement is arranged to generate reference impedance measurement signals. The processing unit is further arranged to determine the ice thickness based on determinations of a relation between the impedance signals determined by the sensor arrangement and the reference impedance values generated by the reference sensor arrangement.

A device and method for measuring ice thickness on a first surface of a construction element. The device includes a sensor arrangement arranged in connection with the construction element and arranged to provide signals related to an impedance. A processing unit is coupled to the sensor arrangement and arranged to determine the presence of ice based on the provided impedance signals. A reference sensor arrangement is arranged to generate reference impedance measurement signals. The processing unit is further arranged to determine the ice thickness based on determinations of a relation between the impedance signals determined by the sensor arrangement and the reference impedance values generated by the reference sensor arrangement.

A method of regulating the NR speed at which the rotor of a rotorcraft is driven in rotation. On detecting that the rotorcraft is flying under icing conditions in a previously identified critical temperature domain (Dct), the NR speed is either decreased in the situation where the ambient outside air temperature (OAT) lies in a low temperature icing range (Ptb) of the critical temperature domain (Dct), or else it is increased in the situation where the ambient outside air temperature (OAT) lies within a high temperature icing range (Pth) of the critical temperature domain (Dct).

Volume of a fluid in a tank is determined by measuring the pressure of fluid proximate to the bottom of the tank. The depth of the fluid is then determined from the pressure and density of the fluid. Fluid volume is then determined mathematically or from charts given the depth as well as the size and shape of a tank. Multiple pressure readings may be taken along the bottom of a tank, and an average pressure determined that may be used to calculate volume. Pressure readings may be taken at different heights to determine fluid density used to calculate volume. Pressure readings may be adjusted for atmospheric pressure. Volume increases or decreases exceeding a respective predetermined threshold may be flagged and alerts generated. Volume calculations may be recorded for comparing against a volume of fluid recorded as being purchased.

Volume of a fluid in a tank is determined by measuring the pressure of fluid proximate to the bottom of the tank. The depth of the fluid is then determined from the pressure and density of the fluid. Fluid volume is then determined mathematically or from charts given the depth as well as the size and shape of a tank. Multiple pressure readings may be taken along the bottom of a tank, and an average pressure determined that may be used to calculate volume. Pressure readings may be taken at different heights to determine fluid density used to calculate volume. Pressure readings may be adjusted for atmospheric pressure. Volume increases or decreases exceeding a respective predetermined threshold may be flagged and alerts generated. Volume calculations may be recorded for comparing against a volume of fluid recorded as being purchased.

A method for determining a classification of a condition of a road surface for vehicle traffic includes: defining a reference surface of the road surface ahead; illuminating the reference surface with a light source on the vehicle; detecting light reflected off the reference surface; and determining classification of the condition of the road surface by analyzing detected information related to the reference surface. Furthermore, the method includes: illuminating the reference surface using laser or LED light; providing image information for the reference surface by detecting the reflected light with a Lidar unit; providing further image information for the reference surface by scanning the reference surface using an RGB sensor; and classifying the road surface by combining image information from the Lidar unit and the RGB sensor. The disclosure also relates to an arrangement for determining a classification of a condition of a road surface for vehicle traffic.