초록 ▼

The present invention is a thermometer used for measuring furnace temperatures in the range of about 1800°to 2700°C. The thermometer comprises a broadband multicolor thermal radiation sensor positioned to be in optical alignment with the end of a blackbody sight tube extending into the furnace. A va

The present invention is a thermometer used for measuring furnace temperatures in the range of about 1800°to 2700°C. The thermometer comprises a broadband multicolor thermal radiation sensor positioned to be in optical alignment with the end of a blackbody sight tube extending into the furnace. A valve-shutter arrangement is positioned between the radiation sensor and the sight tube and a chamber for containing a charge of high pressure gas is positioned between the valve-shutter arrangement and the radiation sensor. A momentary opening of the valve shutter arrangement allows a pulse of the high gas to purge the sight tube of air-borne thermal radiation contaminants which permits the radiation sensor to accurately measure the thermal radiation emanating from the end of the sight tube.

대표청구항 ▼

A temperature sensing device for use in a high-temperature environment comprising: an elongated blackbody sight tube penetrating into the environment; chamber means coupled to said sight tube at a location external of said environment; thermal radiation sensing means supported by said chamber at a l

A temperature sensing device for use in a high-temperature environment comprising: an elongated blackbody sight tube penetrating into the environment; chamber means coupled to said sight tube at a location external of said environment; thermal radiation sensing means supported by said chamber at a location thereon remote to the coupling with the sight tube and in optical alignment with a surface at the distal end of the sight tube innermost within the environment and indicative of the temperature in the environment; conduit means coupled to said chamber for charging said chamber with high-pressure gas; and valve means carried by said chamber for isolating the interior of the sight tube from the pressurized gas in said chamber and the thermal radiation sensing means, said valve means being sequentially actuatable for effecting the flow of the charge of pressurized gas from said chamber through the sight tube to purge said sight tube of airborne thermal radiation attenuating material prior to measuring the temperature of said surface at the distal end of the sight tube with the thermal radiation sensing means through an opening in the actuated valve and for isolating the interior of the sight tube from said chamber and the thermal radiation sensing means between measurements of the temperature of said surface.