California Institute of Technology

The United States of America As Represented by the United States

Paul K Henry

Donald B Bickler

Edward P Fortier

D Daniel LoGiurato

The invention relates to a stabilization device for stabilizing dendritic web seed buttons during initiation of crystal growth from a float zone melt. The invention includes angular maintenance means for maintaining a constant angular orientation between the axis of a growth initiation seed and the upper surface of a web button during withdrawal of the web button from the melt. In the preferred embodiment, the angular maintenance means includes an adjustable elevation tube which surrounds the seed, the weight of which may be selectively supported by the seed button during web button withdrawal.

Device for mechanically stabilizing web ribbon buttons during growth

The sensing head of a two-color band ratioing pyrometer of a known type using a fiber optic cable to couple radiation to dual detector photodiodes is improved to have high spatial resolution by focusing the radiation received through an objective lens (i.e., by focusing the image of a target area) onto an opaque sheet spaced in front of the input end of the fiber optic cable. A two-mil hole in that sheet then passes radiation to the input end of the cable. The detector has two channels, one for each color band, with an electronic-chopper stabilized current amplifier as the input stage followed by an electronic-chopper stabilized voltage amplifier.

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Altadena, CA, United States of America

Paul K Henry