A vibration sensor with a diaphragm that can be set into vibration, a piezo-electric drive for setting the diaphragm into vibration and for detecting vibrations in the diaphragm, with the drive having at least two serial mechanical piezo elements, a temperature sensor, with at least a first piezo element made from a first piezo-electric material and at least a second piezo element made from a second piezo-electric material.

An escape system for a sinking car and an ultrasonic component thereof are illustrated. In the present disclosure, an ultrasonic signal transmitting unit capable of emitting ultrasonic is installed on the car. When the car falls into the water, based upon an acoustic resistance concept which the ultrasonic propagated in air collides and transmits into the water, a difference between a reflection or transmittance rate of the ultrasonic and a corresponding set value can be calculated, or alternatively, a difference between a reflection time deviation or a reflection distance of the ultrasonic and a corresponding set value can be calculated. Therefore, a warning signal indicating that the car falls into the water can be fast sent, and this makes sure that the rescue opportunity which the car falls into the water can be grasped to decrease the damage or death of the user.

Examples of analyzing data for a distribution pipe network within a fluid distribution system are disclosed. In one example implementation according to aspects of the present disclosure, a method for analyzing data for a distribution pipe network within a fluid distribution system includes: receiving acoustic data from a plurality of nodes for a plurality of pipe segments; determining a characteristic frequency range for each pipe segment; decomposing the characteristic frequency range into a plurality of frequency sub-bands; building a leak sensitivity model based on the plurality of frequency sub-bands; and implementing a correlation schedule with the plurality of nodes based on a selection of the plurality of frequency sub-bands.

Disclosed herein are a water purifying device and a method for controlling the same. The water purifying device is characterized in that a water discharge module capable of moving vertically is provided with a sensor. Specifically, in the water purifying device of one embodiment, the sensor may measure a height of a container, by transmitting and receiving a signal for measuring a distance at a first point of the water discharge module, and may detect both a height of the inlet of the container and a water level, by transmitting and receiving the signal and measuring a water level at a second point of the water discharge module.

An escape system for a sinking car and an ultrasonic component thereof are illustrated. In the present disclosure, an ultrasonic signal transmitting unit capable of emitting ultrasonic is installed on the car. When the car falls into the water, based upon an acoustic resistance concept which the ultrasonic propagated in air collides and transmits into the water, a difference between a reflection or transmittance rate of the ultrasonic and a corresponding set value can be calculated, or alternatively, a difference between a reflection time deviation or a reflection distance of the ultrasonic and a corresponding set value can be calculated. Therefore, a warning signal indicating that the car falls into the water can be fast sent, and this makes sure that the rescue opportunity which the car falls into the water can be grasped to decrease the damage or death of the user.

A filling element includes a filling-level sensor having an oscillating body disposed to interact with fluid that is in a container being filled. A change in the oscillation of the body, triggered either electromechanically or by fluid flow, provides information indicative of filling level.

An electrical device (10, 13), in particular a power transformer (13), a shunt reactor, or an on-load tap changer (10), comprises a housing (101, 131) that is filled or fillable with insulation oil (11, 11); and a sensor (12) that comprises a piezo element (16) in the housing (101, 131) on a level with a minimum fill level (19, 19) of the insulation oil (11, 11); and an evaluation device (18) that is connected to the piezo element (16); wherein the evaluation device (18) is formed such that it can induce an oscillation of the piezo element (16); and it can determine the fill level from a measurement of a characteristic of the oscillation, in particular the half-life period of the amplitude of the oscillation.

A level measurement system including a tank, a transducer, and a controller. The tank is configured to contain a liquid. The transducer is configured to output an ultrasonic signal into the tank. The controller has a memory and electronic processor. The controller is electrically coupled to the transducer and is configured to determine a ring time of the transducer, and determine a level of the liquid contained within the tank based on the ring time of the transducer.

A liquid-surface position detection device includes: a propagation body being disposed in a container immersed in a liquid and propagating surface waves; a vibration generation and detection means imparting vibrations to the propagation body and including a piezoelectric element detecting reflected surface waves; and a position detection means calculating the liquid surface position from the reflection time of the surface waves. The propagation body is made of a resin material and provided integrally, at the upper part thereof, with an element accommodating part which accommodates the piezoelectric element. The element accommodating part includes a bottom surface section formed so that a portion thereof juts out from a main surface forming the surface of the propagation body. The piezoelectric element is disposed so that a portion thereof juts out from the main surface, and to apply vibrations to the main surface in the vertical direction via the bottom surface section.

The present method makes use of a second receiver-transmitter pair, which, together with a first pair, forms a quadrilateral figure, the horizontal sides of which are parallel to the level of a liquid. In addition, the values of the energy characteristics of Lamb waves propagated simultaneously both between each of the horizontal receiver-transmitter pairs and between a second vertical receiver-transmitter pair are calculated using values obtained from certain horizontal pairs to determine the initial and final values of the measuring scale of other pairs, by means of which the height of the liquid level is determined and/or measured. The device comprises an acoustic receiver and an emitter, each provided with a piezoelectric transducer, which are mounted at a set distance from one another such that a liquid level monitoring region lies therebetween for the simultaneous excitation of a symmetrical and an antisymmetric normal zero mode Lame wave, the device further comprising a second acoustic receiver-transmitter pair and a signal generating and converting unit. Technical result: increased monitoring accuracy together with increased monitoring speed and a broader scope of application.