Acoustic inspection method

Details Acoustic inspection method Acoustic inspection method

1983-05-26

1984-11-06

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73 405A, 165 11R, G01N 2900

Patent

active

044804733

ABSTRACT:
There is disclosed an acoustic inspection method for determining whether the actual fluid flow path through a manufactured fluid flow system such as an evaporator core is of a prescribed length and thereby free of such manufacturing errors as cause a shortened or lengthened fluid flow path. The method comprises the steps of passing a test sound wave of predetermined frequency along the actual fluid flow path through the manufactured fluid flow system and comparing the phase angle of the test sound wave at the exit of the actual fluid flow path being inspected with that of a reference sound wave of the same frequency passing along the exactly prescribed fluid flow path length and on the basis that a difference in phase angle indicates that the fluid flow path being inspected is not of the prescribed length.

REFERENCES:
patent: 3753260 (1973-08-01), Nelkin et al.
patent: 3930556 (1976-01-01), Kusuda et al.
patent: 4289019 (1981-09-01), Claytor
patent: 4327576 (1982-05-01), Dickey et al.
patent: 4412453 (1983-11-01), Nagai et al.

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