Abstract:
The present invention provides a pyrometer system with a tube having a top portion and a bottom portion associated. A pyrometer head is associated with the bottom portion of the elevator tube, and operable to transmit and receive radiation through the tube. A sleeve is connected with the top portion of the elevator tube. A lens, having a focal length which is a function of temperature, and which is related to a distance of a work piece positioned from the lens, is coupled to the sleeve. The sleeve has a coefficient of thermal expansion, and alters the distance between the lens and the work piece due to the coefficient of thermal expansion as a function of temperature to compensate for changes in the focal length of the lens due to variations in temperature.
Abstract:
The present invention provides a pyrometer system with a tube having a top portion and a bottom portion associated. A pyrometer head is associated with the bottom portion of the elevator tube, and operable to transmit and receive radiation through the tube. A sleeve is connected with the top portion of the elevator tube. A lens, having a focal length which is a function of temperature, and which is related to a distance of a work piece positioned from the lens, is coupled to the sleeve. The sleeve has a coefficient of thermal expansion, and alters the distance between the lens and the work piece due to the coefficient of thermal expansion as a function of temperature to compensate for changes in the focal length of the lens due to variations in temperature.
Abstract:
The present invention is directed to a pyrometer system and comprises an elevator tube. The elevator tube comprises an inner tube and an outer tube surrounding the inner tube in telescoping arrangement and extending from a top to a bottom thereof, the arrangement defining a fluid passageway therebetween. The elevator tube further comprises a port associated with the outer tube that is operable to transmit a cooling gas therethrough into the fluid passageway. A pyrometer head is coupled to the bottom of the inner tube and is operable to transmit and receive radiation through the inner tube. The system further comprises a spider collar coupled to at least one of a top of the inner tube or outer tube, and is operable to support a work piece for thermal measurement thereof. In another embodiment, a sleeve having a coefficient of thermal expansion is provided at the top portion of the elevator tube, so that temperature dependent changes in the focal length of a lens associated with the sleeve are compensated.