Device for testing formation of connection

Details Device for testing formation of connection Device for testing formation of connection

1988-08-24

1989-10-03

Myracle, Jerry W.

Measuring and testing

Speed, velocity, or acceleration

Response to multiple sensing means or motion conditions

738653, G01N 2100

Patent

active

048708658

ABSTRACT:
A first laser beam is modulated at a modulation frequency and focused on a first point in the proximity of a connection being tested so as to generate a photothermo elastic wave thereat, and a second laser beam is focused on a second point in the proximity of the connection, which second point is separated from the first point. The second laser beam is scattered at the second point. A detector detects a modulation-frequency component of the scattered second laser beam, so as to detect a propagated level at the second point of the photo-thermo elastic wave from said first point based on the detected modulation-frequency component of the scattered second laser beam. The propagation of the elastic wave depends on the strength of the connection and the detected level of the elastic wave indicates strength of the connection.

REFERENCES:
patent: 3605486 (1971-09-01), Anderholm et al.
patent: 4453414 (1984-06-01), Ronemus et al.
G. Roussett et al., "Influence of Thermoelastic Bending on Photoacoustic Experiments Related to Measurements of Thermal Diffusivity of Metals", J. Appl. Phys., May 1983.
G. Roussett et al., "A Pulsed Thermoelastic Analysis of Photothermal Surface Displacements in Layered Materials", J. Appl. Phys., May 1985.
Paolo Cielo et al., "Photoacoustic and Photothermal Evaluation of Stratified Materials", Applied Optics, Apr. 1986.

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