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Method for producing an ultrasonic transducer core with embedded piezoelectric transducer elements

A piezoelectric transducer and converter technology, which is applied to fluids, instruments, and measuring devices that utilize vibration, and can solve problems such as system design limitations, ultrasonic sensor damage, and easy drift.

Active Publication Date: 2019-02-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A disadvantage of many known ultrasonic flowmeters is that, at least in the case of media in gaseous form, in the case of a small signal path, that is to say a small change in the running time, the change in the running time makes the method slow down. It is often very easy to drift when the rate is small
It is therefore difficult to achieve or even improve the usual tolerances in thermodynamic flow measurements
[0009] That is to say, a disadvantage of the known systems is that these systems are usually strongly subject to design constraints
The disadvantage of embedding the piezoelectric transducer element directly in the adaptation layer is that the piezoelectric transducer element differs from the adaptation body with regard to the coefficient of thermal expansion, which affects the ultrasonic waves, especially during cooling and / or multiple temperature cycles. Converter Cores Bring Problems
Such cracks can lead to complete damage on the ultrasonic sensor, since there is hardly any signal available for measurement due to the large acoustic impedance to be overcome

Method used

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  • Method for producing an ultrasonic transducer core with embedded piezoelectric transducer elements
  • Method for producing an ultrasonic transducer core with embedded piezoelectric transducer elements
  • Method for producing an ultrasonic transducer core with embedded piezoelectric transducer elements

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Embodiment Construction

[0032] exist figure 1 and figure 2The ultrasonic transducer 2 shown in FIG. 2 comprises a piezoelectric transducer element 4 and an adaptation body 8 . An adhesive layer 10 is introduced between the adapting body 8 and the piezoelectric element 4 .

[0033] As primary electro-mechanical conversion principles, eg the electrostatic effect, the magnetostrictive effect, or the piezoelectric effect is used in the ultrasonic transducer 2 . In the case of piezoelectric ceramics as the primary converter element, different resonant vibration modes result, which, depending on the geometry, are more or less pronounced, or which are coupled differently to one another or Decoupling. In the case of simple square or cylindrical geometries, the following vibration modes can firstly be obtained, all of which can be used, at least in principle, for ultrasonic conversion:

[0034] - Thickness vibrations of thin piezoelectric sheets, wherein, in particular when the diameter of the piezoelect...

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Abstract

The invention relates to a method for manufacturing an ultrasonic transducer core (2), comprising: at least one piezoelectric transducer element (4); at least one adapting body (8) which facilitates vibration coupling between the piezoelectric converter (4) and the surrounding medium; at least one temperature expansion compensator (6); the method has the following steps: placing the piezoelectric converter element (4) into a molded into the mold; placing the adapting body into the forming mold; introducing a molding mass into the forming mold, so that the molding mass is in contact with the adapting body (8) and with the piezoelectric The converter element (4) realizes a non-positive, chemical and / or form-locking connection; and the mold mass is hardened to form the temperature expansion compensation body (6). Furthermore, the invention relates to an ultrasonic transducer core (2) which is produced in particular according to the method.

Description

technical field [0001] The invention relates to a method for producing an ultrasonic transducer core and to an ultrasonic transducer core. Background technique [0002] The invention relates to an ultrasonic transducer, which is used as a flow meter, for example in the field of method technology or in the automotive field (in particular for the measurement of volume flow or mass flow in the air intake and / or exhaust of internal combustion engines); or Use as environmental sensors, in particular in the front and / or rear of the bumper of the vehicle, for example for parking assistance systems and / or collision avoidance systems. Typical ultrasonic transducers are used here: they not only transmit ultrasonic waves into a fluid medium (for example air, gas and / or liquid), but also receive ultrasonic waves. Ultrasonic signals are usually transmitted via a fluid medium from the transmitter to the receiver or from the transmitter into the environment and the reflected ultrasound si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/66B06B1/06H10N30/01
CPCB06B1/067G01F1/662
Inventor J·瓦尔特H·劳施
Owner ROBERT BOSCH GMBH
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