X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1988-11-02
1990-03-20
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Absorption
378157, 378 58, G01N 2304
Patent
active
049107577
ABSTRACT:
Two X-ray transmission images of an object, e.g. an electronic device package structure having plural soldering layers are detected in two directions inclined to the plural layers, on the basis of a relative position relation between both X-ray transmission images, one X-ray transmission image is converted on the assumption that soldering portions to be detected are located at a certain layer, into the image in the direction in which the other X-ray transmission image has been detected, and the converted X-ray transmission image is with the other X-ray transmission image to decide that the soldering portions at coincided positions are located at the layer at issue. Further, an object such as an electronic device package structure having soldering portions is irradiated with plural kinds of X-rays with different photon energy spectra to detect the corresponding X-ray transmission images of the object and the X-ray transmission images are processed referring to a previously prepared numerical value table indicating relations between the transmission distances of the plural kinds of X-rays for the soldering portions of the other substance and the transmission X-ray intensities therefor in order to separately detect an image of the soldering portions.
REFERENCES:
patent: 3848130 (1974-11-01), Macovski
patent: 3944830 (1976-03-01), Dessing
patent: 3974386 (1976-08-01), Mistretta
IEEE Trans. Nucl. Sci. NS-27, No. 2, (1980), pp. 961-968. (Provided in English).
Kiyasu Senya
Ninomiya Takanori
Church Craig E.
Hitachi , Ltd.
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