Abstract: An optical device may include an infrared detection unit that detects heat generated at a weldment during welding, a visible light detection unit that detects plasma generated at the weldment and a spectroscopic unit that detects wavelength-specific luminosity at the weldment, wherein the optical device determines an occurrence of welding defects at the weldment based on the detected heat, the detected plasma, and/or the detected wavelength-specific luminosity of the weldment.

Abstract: A leakage electrolyte solution detection device includes a hyperspectral imaging device, an image extractor, and a determination unit. The hyperspectral imaging device includes an optical unit that collects reflected light by scanning a rechargeable battery on which the electrolyte solution injection process has been completed, a dispersive element that disperses light processed by the optical unit, and an image sensor that converts the light dispersed by the dispersive element into an electric signal, and acquires a hyperspectral image of a rechargeable battery. The image extractor extracts an image of a band related to a characteristic wavelength of an electrolyte solution from the hyperspectral image. The determination unit determines a presence or absence of a leakage electrolyte solution by analyzing the image extracted by the image extractor.

Abstract: A drying device that includes a drying furnace having an inlet and an outlet, a drying unit installed inside the drying furnace and for drying a to-be-dried object, a number of upper and lower rolls alternately arranged at internal top and bottom portions of the drying furnace, and a roll driver connected to the plurality of upper and lower rolls and moving the upper rolls upwardly and the lower rolls downwardly, wherein after the to-be-dried object is transferred from the inlet to the outlet, the roller driver moves the upper rolls downwardly, moves the lower rolls upwardly, or moves the upper rolls downwardly and the lower rolls upwardly.

Abstract: A drying device that includes a drying furnace having an inlet and an outlet, a drying unit installed inside the drying furnace and for drying a to-be-dried object, a number of upper and lower rolls alternately arranged at internal top and bottom portions of the drying furnace, and a roll driver connected to the plurality of upper and lower rolls and moving the upper rolls upwardly and the lower rolls downwardly, wherein after the to-be-dried object is transferred from the inlet to the outlet, the roller driver moves the upper rolls downwardly, moves the lower rolls upwardly, or moves the upper rolls downwardly and the lower rolls upwardly.

Abstract: An embodiment of the present invention provides a heat treatment apparatus, which can improve a thermal processing speed by increasing a transfer rate of heat energy applied to a heat treatment target using hot air and can reduce a temperature deviation in the heat treatment target. The heat treatment apparatus includes a hot air generator that generates hot air; a heat treatment furnace for performing a thermal process on a heat treatment target disposed therein using the hot air generated from the hot air generator; and a temperature radiator disposed in the heat treatment furnace to be spaced a predetermined distance apart from the heat treatment target, wherein the temperature radiator absorbs some of the hot air supplied from the hot air generator and supplies the same to the heat treatment target as radiant energy.