Ultrasonic sensor having a deflecting element

A deflection element, ultrasonic technology, applied to engine components, material analysis using sound waves/ultrasonic waves/infrasonic waves, instruments, etc., can solve problems such as sensor failure to achieve connection, thermal expansion characteristics difference, sensor function loss, etc.

Active Publication Date: 2016-04-20
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the mechanical properties of the material and the large difference in thermal expansion behavior between the material and the steel, a form fit between the plastic and the steel element cannot ultimately be achieved over the service life and thermal aging of the sensor (formschluessig )Connection
More precisely, the reflective properties of the structure deteriorate over time, which leads to impairment of the ultrasonic sensor signal
This in turn leads to a loss of functionality of the sensor in terms of concentration measurement and / or level measurement

Method used

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  • Ultrasonic sensor having a deflecting element
  • Ultrasonic sensor having a deflecting element
  • Ultrasonic sensor having a deflecting element

Examples

Experimental program
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Embodiment Construction

[0021] exist figure 1 In the figure, only the sonotrode 1 and the acoustic deflection element 10 of a prior art ultrasonic sensor, which also serve as a receiver, are shown. The sound pulses emitted by the sonotrode 1 pass through the bottom wall 7 of the liquid tank in which eg a urea solution is contained. With the ultrasonic sensor, the concentration of the urea solution is to be determined by ultrasonic transit time measurement. In this case, the sound pulse 2 deflected within the deflection element 10 reaches the reflector in a horizontal sound path, is reflected back there and passes through the deflection element 10 again to the sound generator 1 which also operates as a receiver.

[0022] The prior art deflection element 10 shown here has an approximately triangular-shaped plastic molding 3 , which carries a metal mirror element 4 made of stainless steel on its slope. The disadvantages of such an embodiment have already been discussed above.

[0023] In the deflecti...

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PUM

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Abstract

The invention relates to an ultrasonic sensor for performing a propagation-time measurement in a liquid, comprising an ultrasound transmitter and a deflecting element made of plastic, into which deflecting element the ultrasound pulses emitted by the ultrasound transmitter are conducted, which ultrasound pulses are deflected on a boundary surface within the deflecting element by reflection. A hermetically sealed air bag is arranged inside the deflecting element. A wall of said air bag forms the plastic/air boundary surface for reflecting the ultrasound pulses. Such an ultrasonic sensor ensures especially good functional capability of the deflecting element over a long time period, while said ultrasonic sensor is economically produced.

Description

technical field [0001] The invention relates to an ultrasonic sensor for carrying out time-of-flight measurements in liquids, said ultrasonic sensor having a sonotrode and a deflection element made of plastic, the ultrasonic pulses emitted by the sonotrode being directed to the deflection It is deflected by reflection in the element and at interfaces within the deflection element. Background technique [0002] Such ultrasonic sensors are known. The ultrasonic sensor is used to measure the concentration and level of urea solution in a tank which is carried on board in a motor vehicle in order to supply the exhaust gas of the motor vehicle with urea solution and in this way reduce the NO in the exhaust gas X content. The operating principle of the sensor is based on the measurement of the travel time of reflected ultrasonic pulses, wherein the filling height of the urea solution and its concentration are determined from the measured travel time. [0003] In the known sensor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/024G01N29/22G01F23/296
CPCG01N29/222G01N2291/02809G01N2291/02836G01F23/2968G01N29/024G01F23/2962G01N2291/011
Inventor M.罗特
Owner VTESCO TECH GMBH
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