Abstract: Provided is a weathering test instrument that includes: a light source section including a plurality of solid-state light-emitting elements, in which the solid-state light-emitting elements are different in kind from one another, and are configured to emit light beams having respective wavelength regions that are different from one another; a light receptor configured to receive the light beams radiated from the light source section individually for the respective wavelength regions; and a controller configured to control radiant intensities of the respective solid-state light-emitting elements individually, based on received light amounts for the respective wavelength regions derived from the light receptor, and thereby control irradiance at a sample surface for each of the wavelength regions to allow an accelerated test of a sample to be performed.

Abstract: Provided is a weathering test instrument that includes: a light source section including a plurality of solid-state light-emitting elements, in which the solid-state light-emitting elements are different in kind from one another, and are configured to emit light beams having respective wavelength regions that are different from one another; a light receptor configured to receive the light beams radiated from the light source section individually for the respective wavelength regions; and a controller configured to control radiant intensities of the respective solid-state light-emitting elements individually, based on received light amounts for the respective wavelength regions derived from the light receptor, and thereby control irradiance at a sample surface for each of the wavelength regions to allow an accelerated test of a sample to be performed.

Abstract: A weather-fastness test method utilizing a novel sample holder and constituted by the steps of fixing the sample to the holder which is provided with metal coils the shape of which varies in accordance with the variation in the temperature of the ambient air and the radiation heat from a light source and which are connected so as to apply a force to the sample as the temperature changes, placing the sample under predetermined conditions, e.g. exposing the sample to radiation by light, to air having a temperature and humidity of predetermined levels, and to rain, while the sample is under repeated tension, compressive force and/or bending stress due to the variation of the shape of the coils and imparted to the sample, and then evaluating the weather-fastness resistance of the sample.

Abstract: A light fastness/weather resistance accelerated test apparatus, including a test tank having a discharge duct, a light source at the center of the test tank with a sample rotating frame rotatable around the light source and a black panel thermometer mounted on the sample rotating frame. A sensor on the sample rotating frame senses the temperature at the position of a sample. An air flow regulator is provided on the test tank, a blower is mounted for discharging air into the bottom of the tank, and a circulating duct is connected between the air flow regulator and the blower. A damper in the air flow regulator is movable to open the inside of the tank to the discharge duct or to direct air from within the tank into the circulating duct. An air mixer has a further damper and a bypass opening into the air flow regulator. The further damper is controlled to direct air through the bypass in response to the temperature outside the apparatus.