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Temperature-controlled accelerated weathering device
| Details |
Inventors: Robbins, III, Joseph S.;
Assignee: DSET Laboratories, Inc. (Phoenix, AZ)
Primary Examiner: Yasich; Daniel M.
Assistant Examiner:
Attorney, Agent or Firm: Cahill, Sutton & Thomas
A temperature-controlled accelerated weathering test apparatus concentrates solar radiation upon target samples and controls the flow rate of cooling ambient air circulated across the target samples in order to maintain the target sample temperature substantially constant despite variations in ambient daytime temperature and variations in solar radiation intensity. A temperature sensor is secured to an aluminum panel mounted upon the target board of the test apparatus proximate to the target samples for generating an electrical signal relating to the temperature of the target samples. The temperature sensor and related aluminum panel are coated black to enhance absorbtion of solar radiation. A controller responsive to the electrical signal generated by the temperature sensor controls the application of electrical power to a blower motor used to circulate cooling ambient air across the target samples. The controller increases the speed of the blower motor when the sensed temperature of the target samples is above a predetermined set point, and decreases the speed of the blower motor when the sensed temperature of the target samples is below the predetermined set point. |
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DETAILED DESCRIPTION Briefly described, and in accordance with one embodiment thereof, the present invention relates to an accelerated weathering test apparatus of the type used to concentrate solar radiation upon test samples supported by a target board, and wherein the temperature of the test samples is maintained substantially uniform during daylight hours despite variations in the daytime ambient air temperature and variations in solar radiation intensity.
The test apparatus includes a solar reflector for concentrating solar radiation onto the target board for illuminating the test samples.
The apparatus also includes an air circulation system for circulating cooling ambient air across the target board for cooling the test samples.
The air circulation system includes a fan powered by an electrical motor for creating a flow of cooling ambient air.
In order to maintain the temperature of the test samples substantially constant during daylight hours, the apparatus of the present invention includes a temperature sensor mounted to the target board for exposure to the concentrated solar radiation and for generating an electrical signal indicative of the temperature of the test samples mounted to the target board.
The present invention also includes a control mechanism electrically coupled to the temperature sensor and responsive to the electrical signal generated thereby for selectively controlling the application of electrical power to the electrical motor included within the air circulation system.
In this manner, the control mechanism serves to vary the speed of the electrical motor and thereby control the flow rate of cooling ambient air circulated across the target board.
When the sensed temperature of the test samples increases, the control mechanism increases the speed of the blower motor to circulate more cooling ambient air across the target board in order to lower the temperature of the test samples.
Similarly, if the sensed temperature of the target samples drops below the desired nominal temperature, the control mechanism decreases the speed of the blower motor to permit the test samples to warm up
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Optical Systems 
