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Leak detection using acoustic wave transducer

A technology of acoustic wave transducer, leak detection device, applied in the field of detection of leaks

Inactive Publication Date: 2016-04-27
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The subject matter of the present application was developed in light of the current state of development and in particular in light of the problems and disadvantages of conventional hermetically sealed chambers which have not yet been fully resolved by currently available systems

Method used

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  • Leak detection using acoustic wave transducer
  • Leak detection using acoustic wave transducer
  • Leak detection using acoustic wave transducer

Examples

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Embodiment Construction

[0026] References throughout this specification to "one embodiment," "an embodiment," or similar language mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. The appearances of the phrases "in one embodiment," "in an embodiment," and similar language throughout the specification may, but are not necessarily all referring to the same embodiment. Similarly, use of the term "embodiment" means an embodiment of a particular feature, structure, or feature described in connection with one or more embodiments of the present disclosure, however, there is no explicit correlation to indicate that the embodiment may otherwise be associated with a or more embodiments.

[0027] figure 1is a schematic block diagram of one embodiment of an acoustic wave actuator 110 and acoustic wave transducer 120 leak detection device 100 included within a hermetically sealed cavity 50 . ...

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Abstract

The present disclosure relates to a leak detection apparatus that includes an acoustic wave actuator mounted within a hermetically sealed chamber. The hermetically sealed chamber isolates a fluid medium from an external atmosphere and the acoustic wave actuator propagates an acoustic wave through the fluid medium. The apparatus further includes an acoustic wave transducer mounted within the hermetically sealed chamber and a comparison module. The acoustic wave transducer detects fluid pressure wave data related to the acoustic wave. The comparison module calculates an acoustic velocity based on the fluid pressure wave data and compares the acoustic velocity to a predetermined threshold velocity in order to recognize leaks in the hermetically sealed chamber.

Description

technical field [0001] The present disclosure relates to hermetically sealed cavities and, more particularly, to detecting leaks within hermetically sealed cavities using acoustic wave transducers. Background technique [0002] Hard disk drives are widely used to store digital data or electronic information in enterprise data processing systems, computer workstations, portable computing devices, digital audio players, digital video players, and the like. Typically, hard disk drives store data on one or more magnetic recording media each having a layer made of a magnetic material. A hard disk drive includes a read / write head provided with a write member in which regions or bits of magnetically polarized magnetic material encode different polarities to binary 0s or 1s. Thus, data is recorded in the form of magnetically encoded areas or bits of magnetic poles. The direction of magnetization can be referred to as one of a positive state and a negative state. Each bit is capab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/18
CPCG01M3/24G01N29/024G01N29/036G01N29/4427G11B20/1816
Inventor 江口一崔成熏初治广海
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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