| 摘要 |
A television camera, such as an infrared television camera, is positioned to view a hot surface, the temperature profile of which is to be monitored and the temperature at selected points of which is to be measured. The specific application to a Czochralski type crystal puller is described. A television monitor is employed to give the temperature profile and an indicator scheme is employed with the TV monitor to allow manual positioning of the indicator to visually chosen spots on the monitor whereby the temperature at those visually chosen spots is automatically provided. The horizontal and vertical voltage used to position the pointer is also used to control a sample and hold circuit to thereby allow the sampling and holding of the video signal corresponding to the selected point. The video signal sampled is converted to digital, which digital signal may be employed to provide a visual indication of the temperature at the selected point, or alternatively, to control a process or, for example, to be processed by a computer. The particular points chosen at which temperatures are to be determined, may systematically be achieved by way of a computer.
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