Composite wall, notably motor vehicle windshield, including an u

Details Composite wall, notably motor vehicle windshield, including an u Composite wall, notably motor vehicle windshield, including an u

1995-01-17

1997-01-28

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

318DIG2, 318483, 318460, 296 9615, H04R 1700, G05B 500

Patent

active

055983804

ABSTRACT:
The composite wall comprises a first sheet and second sheet separated by an intermediate layer as well as an ultrasonic detection device placed on a face of said second sheet and comprising a transducer element able to emit an incidental ultrasonic signal of frequence f, and able to receive an ultrasonic signal reflected on a face of said first sheet. The intermediate layer comprises at least facing the transducer element, an inserted element whose two faces are respectively in close contact with the first and second sheets. Further, the frequence f of the transducer element satisfies the following relationships:

REFERENCES:
patent: 5138241 (1992-08-01), Shimizu et al.
patent: 5266873 (1993-11-01), Arditi et al.
patent: 5414257 (1995-05-01), Stanton
patent: 5432415 (1995-07-01), Ittah et al.

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