A method for optically determining the temperature of a molten metal with a measuring device, including calibrating a replacement measuring chain by a measuring chain as a system-internal measuring standard. The measuring device includes an optical waveguide, to guide electromagnetic radiation emitted from the metal or from the tip of the optical waveguide to an optical detector, at least one replacement optical waveguide, an optical detector for determining the temperature of the metal from an analysis of the electromagnetic radiation, a measuring chain, in which the optical waveguide is the measurement recorder, and at least one replacement measuring chain, in which a replacement optical waveguide is the measurement recorder. A reeling device includes a conveying device for successive reeling of the optical waveguide from a stock and of the replacement optical waveguide from a replacement stock, a receiving device for a stock and at least one replacement stock.

An apparatus for measuring temperature of turbine blades, including: a radiation collection device, a data processing module; a master control unit (MCU); a calibration module; and a motion servo. The radiation collection device includes a scan reflector, a collimator lens, a first dichroic mirror, a first focus lens, a visible and near-infrared (VNIR) detector, a second dichroic mirror, a second focus lens, a short-wave infrared (SWIR) detector, a third focus lens, and a medium-wave infrared (MWIR) detector. The calibration module includes a calibration reflection mirror and a blackbody furnace. The scan reflector, the collimator lens, the first dichroic mirror, the second dichroic mirror, the third focus lens, and the MWIR detector are disposed successively along a first optical axis; the first dichroic mirror, the first focus lens, and the VNIR detector are disposed successively along a second optical axis that is perpendicular to the first optical axis.

An apparatus for measuring the temperature of a glass melting furnace includes a glass window part which has a transparent glass window and is mounted to a temperature measurement hole of the glass melting furnace and extended outward from the glass melting furnace, and a camera part which has a thermographic camera to capture image of an inside of the glass melting furnace through the glass window part. The measuring apparatus supplies cooling gas into the through hole in upper and lower directions, thereby preventing the surface of the glass window from being covered with fumes, and confines heated gases and fumes to the glass melting furnace.

The invention relates to an immersion device and a method for detecting a position of an optical cored wire using an immersion device. An immersion device for measuring a temperature of a metal melt inside an electric arc furnace vessel with an optical cored wire comprises a blowing lance for blowing purge gas into an entry point to the vessel and a detecting means for detecting a position of the optical cored wire. The optical cored wire can be moved in a feeding channel and/or in the blowing lance relative to the entry point. The detecting means is configured to detect the presence of the optical cored wire in or close to the blowing lance. This enables short distances between the leading end of the fiber and the melt and, thus, short time intervals between temperature measurement sequences.

A device for detecting at least one thermographic image including a thermal camera sensitive to infrared radiation for acquiring the thermographic image; a protective case, inside which the thermal camera is inserted, having a window through which the thermal camera is able to acquire the thermographic image; a screen, positioned outside the protective case and movable between a first operating position at which it is superposed on the window to protect it from environmental disturbances and a second operating position wherein it is shifted from the window, allowing the thermal camera to acquire the thermographic image; a pneumatic system for supplying air inside the protective case having an inlet outside the protective case; a computerised command and control unit; the pneumatic system includes means for adjusting and distributing the air operating inside the protective case and in communication with the external inlet controlled by the computerised command and control unit.

An apparatus and method for thermal imaging of an interior space of a high temperature furnace through an opening in a wall of the furnace. An outer housing houses at least a portion of a rigid borescope. The outer housing has a port for aspirating ambient air through the outer housing to cool the rigid borescope and passing the air through a hole at the end of the outer housing and into the furnace. A camera is operatively connected to a rigid borescope but is located such that it is isolated from the air passing through the outer housing.

The invention relates to a method and an arrangement for precise monitoring and control of torrefaction temperature, which enables accurate control of the quality and properties of the torrefied material. The method includes determining the surface temperature of the biomass in the torrefaction arrangement is using an IR-thermometer and hot nitrogen gas a purge gas.

Disclosed is a pyranometer with a housing, a sensor in the housing, an inner window and an outer dome-shaped window both overlying the sensor. An air inlet duct and an air outlet duct extend in the housing and end in a space confined by the outer window for passing air through the space, from the inlet duct to the outlet duct. The housing is substantially closed such that no outside air flows are allowed into the housing and includes a ventilator, the inlet duct being in fluid communication with a high pressure side of the ventilator, the outlet duct being in fluid communication with a low pressure side of the ventilator. The air blown into the space below the outer window is heated by the ventilator power and optionally by and added electrical heater.

An apparatus and method for thermal imaging of an interior space of a high temperature furnace through an opening in a wall of the furnace. An outer housing houses at least a portion of a rigid borescope. The outer housing has a port for aspirating ambient air through the outer housing to cool the rigid borescope and passing the air through a hole at the end of the outer housing and into the furnace. A camera is operatively connected to a rigid borescope but is located such that it is isolated from the air passing through the outer housing.

Provided is an outer casing having a bottomed tube shape, the casing having a cooling water supply port, and a cooling water discharge port, and being inserted into a high-temperature furnace; an inner casing having a bottomed tube shape inserted into the outer casing; an imaging unit that is disposed in the inner casing which captures an image of the exterior of the outer casing; and partition members that are between an inner surface of the outer casing and an outer surface of the inner casing which define a first flow channel, a second flow channel, and a communicating channel for communicating the first flow channel and the second flow channel between the bottom of the outer casing and the partition members.