JP2008185600A - Improved accelerated weathering apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for accelerated wheathering testing specimens having discharge lamps as a concentrated light source for accelerating fading, and deteriorating of composition and structure of specimens and also having an improved control, calibration structure, and operations method. <P>SOLUTION: Irradiation is sensed by a test module for monitoring a weathering test process from an improved location, in the manner in which the specimens are exposed to irradiance. The test modules are attached to a pocket formed in a door of a test chamber so that the senstive modules are not exposed to harsh environment in the test chamber. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a device that promotes the weathering effect of a sample, and more particularly, a discharge lamp that serves as a concentrated light source that promotes fading, composition, and structural deterioration of a sample, and a control, calibration structure, It relates to an improved operation method. In a preferred embodiment according to the present invention, an ultraviolet fluorescent lamp that approximates natural sunlight at the ultraviolet spectral point is used as a light source, and this causes deterioration, and this will be described in particular. . However, it will be understood that other discharge lamps, typically xenon lamps, etc. may be used as the light source.

  As shown in FIG. 1, a conventional test apparatus using a discharge lamp has eight ultraviolet lamps 10 provided in a test chamber 12 and extending symmetrically downward in a cross section. The sample 14 to be tested is mounted on two opposing sample support walls of the housing of the test apparatus for the inner surface to face the lamp and receive irradiation therefrom. In the illustrated apparatus, there are two samples, an upper part and a lower part, but there may be only one sample or two or more samples. The back surface of the sample 14 is exposed to the atmosphere outside the apparatus. The outside air is heated and blown into the chamber 12 to adjust the temperature of the chamber 12. The moisture in the moisture supply tank 16 is heated by conventional means and evaporated to supply moisture to the chamber 12.

  In the above test apparatus, as an example of the operation, the sample 14 is irradiated with irradiation light at a temperature of 60 ° C. for 16 hours, and then the lamp 10 is turned off and the interior of the chamber 12 is caused to generate moisture. Hold at 50 ° C. for 8 hours. These two steps (these constitute one cycle of the degradation test operation) are repeated in succession. While the lamp is turned off, the humidity of the chamber 12 is high, and the back surface of the sample is exposed to low temperature outside air. Thereby, the surface of the sample becomes wet by liquefaction. Thus, humidification of the sample, irradiation with ultraviolet rays, and drying are repeated, and the deterioration of the sample is promoted. It will be appreciated that the above description is only one example of a cycle for this type of device.

  However, there are problems with the apparatus shown in FIG. First, there is nothing that senses the output of the fluorescent lamp 10 in order to detect the deterioration rate or control the irradiation output. In this type of apparatus, the usual way to make the output from the lamp uniform is to rotate the position of the lamp at a predetermined time interval and in a predetermined procedure. Instead of testing to detect the actual output of the lamp, an assumption of power output is made and a rotation procedure is created taking this assumption into account.

  Another disadvantage of this type of device is that there is no one for adjusting the lamp during start-up and operation. Therefore, the lamp life is shortened and the test accuracy is distorted. Furthermore, it does not have the function of calibrating the illumination from the lamp.

  Various attempts have been made to remedy the above disadvantages of the conventional test apparatus shown in FIG. These include the Atlas Ci35 FADE-OMETER (registered trademark) device from Atlas Electric Devices Company, the device XENOTEST (registered trademark) 1200 CPS from Heraeus, US Pat. No. 4,544,995 issued October 1, 1985, US Pat. No. 4,544,995 issued to Cocot et al. Issued on Apr. 27, 1971, and US Pat. No. 5,206,518 issued to Fedo et al. Issued Apr. 27, 1993.

  Atlas devices are being used with xenon arc lamps and have a closed-loop illumination monitor as the primary light control system. The monitor uses a light pipe, an interference filter, and a photosensitive diode that supplies power to the solid state electronic device, maintains a predetermined irradiation level, and sums the energy received by the sample through the integrator. The device further includes a manual illumination control for periodically calibrating the system.

  Heraeus devices are also being used with xenon arc lamps. This device has three light detectors that detect the output of three separate xenon arc lamps.

  A conventional device that includes the elements of these two devices described above has a discharge lamp. This is a xenon type and is installed vertically. A filter around the discharge lamp is provided to pass only light of a desired wavelength. The sensor is provided to sense the output of the discharge lamp arranged vertically, and the rotating sample holding rack is arranged so as to surround the discharge lamp. Each detection part is comprised so that irradiation from each discharge lamp may be detected exceeding fixed time. The rotating sample holding rack rotates the sample placed on the sample holding rack. The sensor is adapted to detect the output of the discharge lamp, and the rotating sample holding rack is attempted to provide a uniform dose to each sample as an overall average. The inner wall is used to direct the reflected light of the discharge lamp to the outside sample.

  It is known that other devices having a UV lamp with a similar configuration of FIG. 1 have a single sensor. However, in such a configuration, it is necessary to adapt the characteristics of the lamp prior to installation. This is necessary because the sensor senses only the lamp closest to the installation location. Thus, the sensor assumes that the lamp that is spaced from the sensor behaves the same as the lamp that it is actually sensing.

  The Suga patent attempted to improve the apparatus shown in FIG. 1 by adjusting the arrangement of the discharge lamp 10 in FIG. 1 to be asymmetric. The discharge lamps 10 are not arranged directly below each other, but rather they have a special arrangement. This is performed in the Suga patent with the intention of uniform irradiation by the sample 14.

  The Cocot et al. Patent refers to an apparatus that uses an elongate illumination source within a cylindrical carrier surface. The Cocot et al. Patent discloses three methods for providing uniform illumination to a sample. First, a mirror that reflects usable light is installed. Next, the light source is designed to increase the luminous intensity at the edge. Finally, an irradiation disk is used to suppress the divergence of irradiation from the light source.

  The Fedor et al. Patent is similar in construction to the apparatus shown in FIG. 1 and has an improved light output controller and light generator in the test chamber. The Fedor et al. Patent discloses an apparatus having a housing having a test chamber and a sample support wall provided in the chamber. A light source is provided in the test chamber. The ballast is connected to the light source and controls the amount of power received by the light source from the power source. The controller is connected to the ballast and generates a ballast control signal for controlling the operation of the ballast according to a desired target value. A light source detector is placed in the sample support wall to detect existing illumination in the test chamber. Thus, the light source detector can generate an illumination signal, which is input to the controller. In order to maintain the desired target value, the ballast control signal is adjusted, for which the controller uses the irradiation signal. The calibration unit has a reference detector inserted in the sample support wall adjacent to the light source detector, which detects irradiation in the test chamber and generates a reference irradiation signal. The reference illumination signal is sent to a calibration meter where a calibration signal is generated. The calibration signal is sent to the controller for device calibration.

  The Fedo device further has a septum in the test chamber. The partition is configured to selectively block light from the light source array or change the direction. The light beam is blocked or changed in direction so that the light beam on the sample support wall becomes more uniform.

  The fade device further includes a plurality of simultaneously operating automatic adjustment control channels for controlling the output of the individual light sources. The plurality of channels controls the output of at least one light source.

  While the above is an improvement over the prior art device described above, there are still drawbacks. Looking at the Atlas and Heraeus devices, both use sample rotating rack members. This rack is needed for basic reasons. Atlas devices have a monitor system that monitors the total power output of the xenon arc lamp to maintain a preset total illumination power level that exceeds a certain time throughout the system. The Heraeus device uses three sensors to control the output of three different lamps over a period of time. These sensor members are used to produce a certain irradiation over a certain time. However, none of these devices uses a sensor member that generates irradiation spatially and continuously.

  Both of these devices use rotating sample racks in an attempt to achieve spatial uniformity. Therefore, spatial uniformity is achieved by rotating the sample in the carousel around the lamp, so that the significant amount of light received by each sample has different illumination at each point around the sample surface. Shows the average. Although the uniformity is increased by the rotation of the rack, a motor and related drive mechanism are required, and the configuration of the apparatus becomes more complicated.

  However, although these devices have the function of sensing irradiation, these functions are intended only for a constant temporal output, not spatial. Due to the structure of the device, the irradiation is different for each point around the sample. Therefore, the area located in front of the discharge lamp is a high irradiation area, whereas the sample at a point away from the discharge lamp receives lower irradiation. The rotation of the rack is intended to make the irradiation on the sample uniform as a whole.

  Known UV systems using a single sensor have the disadvantage that the lamp needs to be adapted to the system. This requires extensive testing of the lamp before use. As a further disadvantage, in such a system, when a lamp located far from the sensor location burns in or loses its function, a decrease in lamp output is not perceived. This is correct because only the most recent lamp is actually sensed, and the remaining lamps are assumed to be functioning as well.

  The Suga patent attempts to improve the uniformity of the light hitting the sample by separating the two central lamps from the sample in order to increase the uniformity of the light from the top to the bottom of the sample. The disadvantage of this configuration is that it is not easy to modify existing weathering devices to obtain the Suga patent improvement.

  The disadvantage of the Cocot et al. Patent is that it assumes a single lamp system. The disadvantage of other Cocot patents is the increased complexity and cost of the device.

  A further drawback with the above conventional test apparatus is its calibration function. These devices require manual operation by an operator. Conversely, this means that the operator needs to make a critical decision in order to make a proper calibration. Since the operator is responsible for making decisions while manually recalibrating the device, the accuracy of the calibration will depend on the skill of the operator. Furthermore, since calibration is performed manually, downtime occurs during such calibration, and inaccuracies due to operator error exist with considerable probability.

  The Fedor patent attempts to automate the control and calibration procedures of the test equipment. Simultaneous control monitors multiple sensors located in the sample support wall and controls each separate channel. To calibrate the individual sensors, the operator opens the door and installs a reference sensor inside the sample support wall in the test chamber, in close proximity to the individual sensor. Unfortunately, the calibration operation is unduly error prone to the operator. The operator must manually select the lamp type and the respective calibration position. The problem with this calibration procedure is that the operator must ignore the safety system, which further causes an error in reading the reference sensor. In addition, the operator is exposed to harmful ultraviolet radiation.

  Fedo also seeks to control the radiation of light within the chamber by providing a partition between the lamp trains. The disadvantage of this configuration is that the individual sensors and the reference sensor are mounted inside the sample support wall. In this arrangement, the sensor is exposed to all of the exposure effects encountered by the sample. Thus, when used in this device, the sensor will fail, resulting in test errors. Another drawback is the ballast for controlling the lamp power. Fedor uses only conventional ballast in which a signal is sent to the ballast to increase or decrease the power from the ballast.

  A further disadvantage of the fade device is the use of a coincidence control algorithm, which causes an error bias in the sensor reading. As a result, the irradiation measurement value becomes inaccurate. Thus, the control system can have an error bias and the test results can be unreliable.

  Therefore, an improved accelerated weathering device is desired in terms of sensor placement, unbiased sensor reading, control and calibration methods, ballast configuration and operation. The present invention is an improved accelerated weathering device that overcomes all of the above and other problems, is easy to operate and has a highly reliable test configuration.

  In order to solve the above problems, the present invention includes an enclosure having at least one door for accessing a test chamber provided in the enclosure, and a sample holder provided in the test chamber. A sample mounting part for supporting, a light source installed in the test chamber for generating light in the test chamber, a power source for supplying power to the light source, and being removed in a pocket provided in at least one door Connected to a light source that controls the amount of power from the power source that the light source receives and the test module that detects the irradiation from the light source in the test chamber that is installed and generates an irradiation signal corresponding to the detected irradiation Are connected to the test ballast, the test module and the ballast, and the ballast operation is controlled by sending a ballast control signal. And a calibration module that detects illumination in the test chamber to generate and display a reference value representative of the detected illumination, the controller testing to maintain the desired illumination in the test chamber. The ballast control signal is adjusted in response to the illumination signal received from the module, and the calibration module is interchangeably replaced with a test module in the pocket to detect illumination in the test chamber and adjust the ballast control signal. Therefore, the accelerated weathering device is characterized in that a reference value input to the controller is displayed on the calibration module.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2A is a front view of the improved accelerated weathering test apparatus 200 according to the present invention. The apparatus 200 includes an enclosure 202 having at least one door 204 for accessing an internal test chamber 206. Although only one door 204 is described here, those skilled in the art will appreciate that another door, identical in shape and function, is in an opposing position. The test chamber 206 is constituted as a whole by a tank in the enclosure 202. A sample mounting device 208 (FIG. 14 is the optimal view) is installed in the test chamber 206 to hold the sample holder 210. The jack 205 is installed in the enclosure 202 to connect a plug and download the acquired data or data stored in the device 200. The jack may be any structure that provides the desired interface characteristics. For example, RS485, RS232, or another interface may be used.

  In the present embodiment, in the sample mounting device 208, the top rail and the bottom rail form a sample support wall as a whole. The bottom rail is installed at a first or outer position of the tank adjacent to the axis of rotation of the door 204. Since the upper rail is in the second or inner position in the tank away from the top of the door near the center of the chamber 206, the mounting device is on a plane inclined to the vertical axis. A sample holder 210 is installed on each sample support wall for exposure to light, heat and liquid in an accelerated exposure environment. The sample holder 210 is positioned almost continuously on the sample support wall. One of the sample holders is not attached, but this forms an opening 216 along the sample support wall that cooperates with a pocket 218 formed in the door 204. Thus, when the door 204 is closed, the sensor 220 attached to the pocket 218 is exposed to the light source 212 for accurate illumination detection.

  A light source 212 is installed in the test chamber 206 to generate light in the test chamber 206. In this embodiment, a plurality of light sources 212 or a lamp row is used. In this embodiment, a plurality of lamps are installed in the first row and the second row, and each has four lamps. One skilled in the art will appreciate that the configuration, shape, and number of lamps can be varied without departing from the invention. The light source 212 is selected from a group of lamps that generate ultraviolet rays in the range of UV-A, UV-B, and UV-C. For example, the lamp may be a fluorescent lamp, xenon or other suitable lamp.

  A power source (not shown, see FIG. 3) supplies power to the light source 212. For example, the power source may be a single phase 110V or 120V, multiphase 220V, 240V, 440V available as required, as required. An external door protector 214 may be provided connected to the enclosure 202 to protect the enclosure 202 during extended testing. The control panel 216 is for use by an operator in an operating system, as will be described in detail below.

  FIG. 2 (b) is a detailed perspective view of the tank portion 222 of the accelerated weathering test apparatus of FIG. 2 (a). The tank portion 222 is a cabinet type enclosure having a pair of doors 204 on opposite surfaces, and constitutes the inside of the test chamber 206. The light source is installed in the test chamber 206 and power is supplied to the light source by a power source as described above and as detailed below. The tank portion 222 further has an inner frame and an outer panel 224.

  The first door 204 is attached to an opposing side panel 224 so as to rotate, and is opposed to a second door (not shown). This is attached to the side panel 224 for rotation. Although only the first door is shown in the figure, the second door is the same in terms of structure and function. Therefore, only the first door will be described below. Door 204 provides access to test chamber 206. An embedded pocket 218 is formed in a substantially middle portion of the door 204 and has a recess on the outer surface of the door 204. A test module (not shown but described in detail below) and a calibration module (not shown but described in detail below) are each replaceable and removable in a pocket (described in more detail below). Installed. A pair of vertically arranged test modules (not shown, described in detail below) detects each irradiation in the test chamber 206 from the light source and generates an irradiation signal indicative of the detected irradiation. In addition, because it is removably installed, the test module is not placed in the harsh environment of the test chamber.

  The test module (not shown, detailed below) includes a test sensor 226 that is formed at a location corresponding to the light source in the pocket 218 to detect illumination in the test chamber from the light source. Is inserted into the formed hole 228. The test module is configured to sense separate spaces of the five sample mounting devices. The test sensor may be of any type known to those skilled in the art, such as an optical photodiode.

  The bottom surface of the pocket 218 is inclined with respect to the door 204, and forms a surface parallel to the surface forming the sample support wall. As a result, the bottom surface of the pocket 218 comes close to the sample support wall and the sample holder 210 thereon, but the pocket 218 does not contact the sample mounting device 208 or the sample holder 210. When the door is closed, the inclined bottom surface of the pocket 218 causes the sensor 226 to be evenly positioned between adjacent lamps within the opening 216 of the mounting device. However, this arrangement may be modified so that the pocket 218 protrudes on either side if necessary from the structure of other parts of the accelerated weathering test apparatus. The shape, depth, and contour of the pocket 218 preferably corresponds to the shape of the lamp in the test chamber.

  In accordance with the present invention, the test sensor 226 accurately detects irradiation for each pair of lamps. The pocket 218 has a back surface 230 of the pocket 218 that is spaced apart from the rotation axis of the door 204 and is longer than the front surface 232 of the pocket 218 adjacent to the rotation axis of the door 204 and extends toward the test chamber. It has a substantially triangular shape when viewed from above. The test sensor 226 includes a support or protrusion and an input that is used as a light pipe to move the lamp illumination to a test module installed outside the test chamber 206 within the pocket 218 of the door 204. It is done. The test sensor 226 further includes an optical filter that allows light of a certain wavelength to pass therethrough. The door 204 has a small handle at the top for opening and closing.

  The tank 222 constitutes a test chamber 206 in which the environment is operated by taking in light, heat, and moisture. The multiple holes 234 in the end panel 224 of the tank 222 are for lamps. Similarly, there are multiple holes in the opposing end panels of the tank. The lamp electrical connections are made outside the test chamber to avoid corrosion that can cause control system errors resulting in inaccurate test results.

  The temperature sensor 236 generates a temperature signal corresponding to the temperature in the test chamber 206 and sends the temperature signal to a controller (detailed below) to maintain the desired illumination in the test chamber 206. The temperature sensor 236 may be configured to replace the sample in the sample holder 210, or another small configuration may be employed. Smaller ones require an alternative sample holder 238 in which the temperature sensor 236 is placed between the two sample holes 240. Those skilled in the art will understand which sensor configuration can be used to generate the temperature signal. In this embodiment, the temperature sensor is a sensor whose body is black and generates a signal corresponding to the temperature inside the test chamber 206.

  FIG. 3 is a schematic end view of an accelerated weathering test apparatus illustrating the characteristics of a plurality of self-adjustable control channels for continuously controlling the output of a light source array according to the present invention. In this embodiment, a ballast 302 is provided for each of the four individually adjustable control channels. Since each performs the same operation, only one will be described. Reference numerals 310, 312, 314, and 316 denote test modules, and 308 denotes a controller. Each of the test modules 310, 312, 314, 316 has a plug 328 that allows the controller 308 to automatically test the module when the test module 310, 312, 314, 316 is placed in the pocket 318. In order to connect the controller 308 and the test modules 310, 312, 314, and 316 to be connected to the terminals 310, 312, 314, and 316, a terminal 330 installed in the pocket 318 is connected.

  Each ballast 302 is connected to at least one of the plurality of light sources 304 in order to control the amount of power received by the light source 304 from the power source 306. The control channel further includes a controller 308 connected to the test modules 310, 312, 314, 316, a temperature sensor 318, 320, a control panel 322, and a ballast 302 that generates ballast control signals that control the operation of the individual ballasts 302. Have.

  The test sensors 324 included in the individual test modules 310, 312, 314, and 316 have a linear response in the ultraviolet range in order to detect illumination within the test chamber 326. The test modules 310, 312, 314, 316 generate irradiation signals corresponding to detection of irradiation from the plurality of light sources 304, and the signals are transmitted by a transmission device installed in the test modules 310, 312, 314, 316. It is transmitted to the controller 308. In this example, test modules 310, 312, 314, and 316 amplify and filter the illumination signal to reduce frequency noise. Those skilled in the art will appreciate that this can be accomplished by a variety of means. For example, reducing frequency noise can be accomplished by converting a high impedance signal to a low impedance signal with gain or in a desirable manner. The irradiation signal is sent to the controller 308, which periodically adjusts the ballast control signal to maintain the irradiation signal at a desired value. The controller 308 may selectively or additionally have software that performs some or all of these functions. The ballast control signal is further adjusted by the controller 308 based on the current draw of the ballast.

  The ballast control signal is initially based on a set value indicating the desired illumination in the test chamber input by the operator. In operation, the controller 308 transmits a ballast control signal to the ballast 302 based on the set value. The test modules 310, 312, 314, 316 sense illumination from a nearby light source and send an illumination signal to the controller 308. The controller 308 receives the irradiation signal from at least one of the test modules 310, 312, 314, and 316. The controller 308 then adjusts each ballast control signal based on the increase between the ballast control signal and the illumination signal. Thereafter, the controller 308 outputs the adjusted ballast control signal. The above steps are then repeated in the next test module 310, 312, 314, 316 for the desired time period. In another embodiment, the temperature sensor 318 sends a temperature signal to the controller 308. The controller 308 then further adjusts the individual ballast control signals based on the temperature signal.

  The ballast 302 has circuitry that applies a low voltage to the light source 304 for a desired amount of time to warm up the light source 304 before ignition at start-up. This minimizes the impact on the light source 304, thereby extending life and reducing expenditure. For example, the desired time is approximately 1.5 seconds and the voltage is 2-5V, although other numbers can be used by those skilled in the art. Further, after the light source 304 is warmed, an ignition pulse is applied to the light source 304. The ignition pulse is preferably in the range of approximately 400V. Thereafter, the voltage is not raised from the low voltage to the full operation voltage of the light source 304, but gradually raised to that level and returned to the set operation voltage. Thereby, the impact on the light source 304 can be further minimized. The ballast 302 may selectively or additionally include software that performs some or all of these functions.

  Lamp performance depends on a number of factors such as environmental temperature, current, and voltage. These factors must be taken into account in order to optimize the performance of the light source 304. The present invention takes the above factors into account by measuring and inputting these variables into the control system so that the system is optimized by the gain factors. As a result, the life of the light source 304 is extended. By monitoring these variables, the illumination of the light source 304 is controlled separately from the sensor or in cooperation with the sensor as a dual feedback scheme. This is particularly advantageous in predicting the life of the light bulb 304.

  FIG. 4 is a top perspective view of the test module 400. The test module 400 includes a housing 401 having a main body portion 402, a cap 404, a protruding portion 406, a display portion 408, and an attachment device 410. A high-density connecting member (not shown) is also provided. The housing 401 is generally hollow for mounting test sensors and related electronics. The protrusion 406 extends from a hole in the bottom of the housing. The protrusion 406 functions as a known light pipe for sending light from the chamber to the test sensor to generate an illumination signal. The cap 404 is fixed to the main body portion 402 by a plurality of screw fastenings 412. One skilled in the art will appreciate that other suitable fastening methods may be used. Display 408 indicates that the sensor module is properly installed and operating. The attachment device 410 has a pair of substantially U-shaped members installed on both sides of the housing 401 for snapping a protrusion disposed on the bottom surface of the pocket. A printed circuit board (not shown) includes electronic components for amplifying and removing the signal generated from the test sensor and transmitting the signal to the system controller. Amplification and removal of the irradiation signal has the purpose and effect of reducing high frequency noise. This is accomplished by a number of methods known to those skilled in the art. For example, conversion of a high impedance signal into a low impedance signal together with a gain. A plurality of screws (not shown) are used to secure various different parts of the sensor. Other construction, assembly methods and devices can also be used.

  FIG. 5 is a lower perspective view of the test module 500 of FIG. A protrusion 502 and a connection member 504 are shown. The high-density connecting member 504 has a plurality of pins 506 and a ground shield 508. The connection member 504 connects between the sensor module 500 and the system controller. This type of cable (not shown) is securely fixed and mounted inside the door, which makes it highly durable and subject to the harsh environment of the test chamber and the adverse operation of the operator A perfect installation is obtained.

  FIG. 6 shows a calibration module 600 that includes a body 602, a cap 604, a mounting member 606, a display 608, a protrusion 610, a reference sensor (not shown), and a high density connector. (Not shown). The calibration module 600 detects the illumination in the test chamber for generating and displaying a reference value 614 indicative of the detected illumination. The calibration module 600 can be interchanged with a test module in the pocket.

  The cap 604 is fixed to the main body 602 by a plurality of fasteners 611 and has a hole 612 through which the display 608 can be observed. The display 608 generates a numerical image 614 in response to a signal from a reference sensor installed in the housing. The numerical image 614 is a reference value indicating the irradiation detected by the reference sensor. The operator inputs a reference value to the controller to adjust the ballast control signal. The attachment member 606 is U-shaped, and is installed on opposite sides of the main body 602 in order to snap the protrusions arranged on the bottom surface of the pocket. The structure and function are the same as the mounting member on the test module of FIGS.

  Display 608 has a plurality of pins that snap into the circuit board to accommodate signals generated by the reference sensor and associated electronics. The sensor is in communication with the circuit board, the circuit, and components thereon, to generate a signal indicative of detected illumination from a nearby bulb in the test chamber. The calibration module 600 has at least two internal calibration routines that allow calibration of at least two different types of ultraviolet light using the same calibration module. The calibration module 600 may further include an internal channel that automatically calibrates a group of lamps that generate ultraviolet light in the UV-A, UV-B, and UV-C ranges.

  FIG. 7 is a bottom perspective view of the calibration module 700 of FIG. 6 with protrusions 702 and high density connectors 704 shown. The protrusion 702 has the same structure and function as the protrusion of the test module that operates as a known light pipe to protect the reference sensor from the harsh environment of the test chamber. Similarly, the high density connector 704 is connected to a similar high density terminal installed in a door pocket as a test module. Connection to the system controller confirms that the calibration module 700 is in the proper calibration position, and confirms that the type of ultraviolet radiation detected is UV-A, UV-B, UV-C. The calibration module 700 may optionally or additionally have software that performs some or all of these functions. The calibration sensor (not shown) does not automatically send the reference signal generated by the reference sensor to the system controller, but the value is output only to the display for operator observation and manual display. Any type of suitable reference sensor may be used to accomplish this function. For example, the reference sensor may be an optical photodiode or other suitable sensor. The operation of the calibration module and the calibration procedure are described in detail in the following description.

  FIG. 8 is a flow diagram illustrating a series of controls for the four test modules in connection with the accelerated weathering test apparatus. The controller 800 may be any suitable device, for example, a programmable logic regulator (PLC) or other suitable device that continuously monitors and controls illumination, calibrates the controller, and outputs the light source. It may be used as the main system controller for operation of the test unit, including various different weathering test operations based on a plurality of self-adjustable controllable channels to control. The controller 800 automatically detects the difference between the test module and the calibration module.

  Since the remaining control channels are similar and follow the same procedure, the control channel 801 algorithm and procedure for one channel will be described. The control channel includes a test module having a pair of lamps 802, 804 and a test sensor 806, a transmission device and a ballast 808. The control channel is continuously adjusted with the desired number of periods. For example, the first control channel 801 is adjusted, after which the controller moves to the second control channel to make the adjustment. The controller then moves to the third control channel and makes adjustments. Thereafter, the controller moves to the fourth control channel and performs adjustment. Thereby, a test cycle is formed. The controller 800 then repeats for the desired number of cycles and starts a continuous adjustment.

  In operation, the irradiation set value 810, the test parameter 812, and the temperature set value 814 are input to the controller 800 by the operator via the user interface. The user interface can be any suitable display or data entry device. For example, the user interface may be a touch screen or any suitable device. The user interface explains in detail the detection irradiation of the four control channels, which are irradiation setting value 816, test parameter display 818, temperature setting value 820, and 822, 824, 826, and 828 in this embodiment, in the following description. In such a way, it is displayed at any time on the screen of the user interface.

  Controller 800 then initiates the test procedure according to test parameters 812. Since the other control channels function similarly, only the first control channel 801 will be described. The irradiation set value 810 sets a first ballast control signal transmitted from the controller 800 to the ballast 808 in order to set the amount of current received by the lamps 802 and 804.

  The test module sensor 806 detects the illumination at that point from a nearby lamp, generates an illumination signal, and sends it to a proportional-integral derivation module (PID) in the controller so that the illumination signal is sent to the controller 800 as desired. Is compared with the set value 810 input. The gain is a measurement of an error between the set value 810 and the actual irradiation signal generated by the test sensor 806. The latest ballast control signal from the controller's proportional integral derivation module based on the increment value is sent to the ballast 808 to simultaneously adjust the illumination output of the lamps 802, 804. Thereafter, the controller 800 moves to the next control channel for irradiation detection, compares it with the set value, provides a modified ballast control signal, and adjusts the irradiation. Since this process is performed continuously and repeatedly, accurate control of the irradiation for the individual control channels is maintained.

  Additional inputs may be added to individual control channel algorithms, procedures. In a manner similar to the sample mounting described above, a temperature sensor 830 mounted on the black body panel in the test chamber responds to temperature changes and generates a temperature signal to maintain the desired temperature in the test chamber. A temperature signal is sent to the controller 800 to adjust the heater to do so. After comparing the irradiation signal with the irradiation set value and determining the increment, the heater control signal is adjusted. The PID updates the heater control signal from the controller based on the temperature increase value. In another example, the temperature sensor 830 may be mounted on the sample holder between the samples as described above. In yet another embodiment, a temperature signal may be sent to the controller 800 that adjusts the ballast control signal to maintain the desired illumination in the test chamber. In this embodiment, the ballast control signal is adjusted after comparing the temperature signal and the temperature set value to determine the increment. The PID updates the ballast control signal from the controller based on the temperature increase value. The temperature signal and setpoint provide an additional level of control over the illumination output. It is known that irradiation decreases as the temperature of the lamp increases. Furthermore, it is also known that the resistance of a substance depends on its temperature. However, when the lamp set value is the maximum output and the temperature is low, the conventional apparatus cannot compensate for the increase in temperature. However, using the temperature replenishment method described above, the lamp can be abused to compensate for temperature changes and increase lamp life. The ballast controls the irradiation output of the lamp according to the ballast control signal.

  At the beginning of the test procedure, the ballast preheats the photofilament with a low voltage, preferably 2-3 volts, for approximately 1-1.5 seconds. Next, an ignition pulse is applied to the light filament in the range of approximately 400 volts. Thereafter, the voltage gradually increases until the lamp output becomes full. Thereafter, the operating voltage drops to a desired set value. This voltage is maintained during the test procedure. The current to the lamp is relatively low, 430 mA with AC 100V. The crest factor is 1.2 or less, and the lamp state such as voltage and current is obtained 5% from the monitor coil of the output transformer. The voltage range of the ballast control signal is DC 0 to 10V. From 10V to 2V, 10 to 100% of the lamp output is controlled, whereas when the control voltage is 0 to 2V, the lamp output of 130 to 100% is controlled. If the filament resistance decreases due to temperature changes, the ballast maintains the current constant at a lamp temperature of 70 ° C. without loading the output voltage. A function of dimming is also provided using a voltage frequency converter. Increasing the frequency makes the lamp dim, and decreasing the frequency makes the lamp brighter. The reverse is true as well.

  The calibration module 832 includes a calibration or reference sensor 834 that detects the type of the lamp 836 and generates and displays a reference value 838. The calibration algorithm and procedure will be described in detail below.

  9 to 12 are flowcharts showing the operation of the controller / user interface. In FIG. 9A, the main directory is displayed in block 900, from which the operator can reach another subroutine screen of the user interface by pressing an appropriate operation button in decision block 902. it can. The operation buttons access the following subroutine screen, main 904, preview 906, monitor 908, irradiation calibration 910, execution / cancel 912, test list 914, and edit 915.

  FIG. 9B is a flowchart showing the operation of the test list screen. As a result, the operator can load the set existing test into the execution memory or preview any test. Each test has different parameters depending on the substance being tested and the environment. Types of parameters include, but are not limited to, irradiation intensity, cycle time, humidity, temperature, and the like.

  At block 916, a list of available tests is provided to the operator. At decision block 918, the operator determines whether to select the current test. If YES, the operator proceeds to FIG. 11B, which is an execution / cancellation screen. This figure will be described later. If no, the system proceeds to decision block 920 where the operator decides whether to load the test. If YES, the system then proceeds to block 922 where the test procedure is downloaded and executed via an execute / stop screen described below with respect to FIG. If at decision block 920 the operator selects not to load the test, then the system proceeds to decision block 924 where the operator determines whether to edit the existing test. If yes, then the system proceeds to the editing scene. This will be described later with reference to FIG. If no, the system then proceeds to decision block 926 where the operator determines whether to preview the test. If yes, then the system proceeds to the preview screen. This will be described later with reference to FIG. If no, then the system returns to block 916 where the test list is displayed and the procedure begins again.

  FIG. 10 is a flowchart showing the operation of the edit screen. The edit screen corresponds to the edit button 915 on the main directory screen 900 and the block 924 on the test list screen, which allows the operator to create a new test and edit any test parameters of an existing test. . For example, the operator can select the type of lamp used during the test or select parameters such as UV type, spray condensation cycle, segmentation time, UV irradiation set value, temperature set value. is there. At decision block 928, the operator selects the test to be edited. Block 930 indicates the selection of the UV cycle, whereby the operator enters the concentration of irradiation at block 932. Block 934 shows a spray condensation cycle that allows the operator to select either spray or condensation at decision block 936. Block 938 indicates a time selection, which allows the user to enter a time at block 940. Block 942 indicates selection of an irradiation set value, which allows the operator to input an irradiation set value at block 944. Block 946 indicates the selection of the temperature setpoint, which allows the operator to input the temperature setpoint at block 948. Block 950 indicates the selection of lamp types, whereby the operator selects which of the available lamp types to use in the test at decision block 952. In decision block 928, regardless of which change in the parameters indicated in blocks 930-952 the operator has selected, the operator can proceed to decision block 954, where the operator can test (ie, , A collection of parameter values) can be selected to save. If no, then the system returns to decision block 928; if yes, the system saves the test parameters and returns to the main directory screen at block 900.

  FIG. 11A is a flowchart showing a preview screen, which corresponds to the preview button 906 and the test list screen block 926 on the main directory screen 900, whereby the operator previews any test parameter. be able to. At block 956, the system displays the test input and parameters. The system then proceeds to decision block 958 where the operator selects a different test. If the operator selects a different test display, the system then proceeds to decision block 960 where the operator selects which test to display and then returns to block 956. If the operator chooses not to display a different test, the system then proceeds to decision block 962 where the operator chooses whether to choose from an existing test list. If the operator chooses to choose from an existing test list, the system then proceeds to block 916 of FIG. 9 (b). If not, the system then returns to the main directory at block 900.

  FIG. 11B shows the selection of the execution / cancel screen corresponding to the execute / cancel button on the main directory screen 900. On this screen, the operator can execute or cancel the test. At block 964, the system displays the test time and irradiation parameters. The system then proceeds to decision block 966 where the operator chooses whether to perform the test. If yes, then the system proceeds to the main screen described below with respect to FIG. If no, then the system proceeds to decision block 968 where the operator makes a decision to run or abort the test. If YES, the system then returns to block 964. If no, then the system proceeds to decision block 970 where the operator decides whether to reset the test. If yes, the system then returns to block 964; if no, then returns to the main directory screen of block 900.

  FIG. 12A is a flowchart showing a case where the main screen button 904 is selected from the main directory screen 900. In block 972, the system displays all main test information. Block 974 displays the device mode, and block 976 displays the name of the currently running test (ultraviolet, spray condensation cycle, etc.). Block 978 displays the currently executing execution memory, and block 980 displays irradiation and temperature set values. Block 982 displays the actual values of irradiation and temperature for the currently running test. Block 984 displays a message about the status of the currently running test. When finished, the system returns to the main directory at block 900.

  FIG. 12B is a flowchart showing monitor screen selection, which corresponds to the monitor button 908 on the main directory screen 900. At block 986, the system displays the illumination settings for each control channel. At block 988, the system displays the actual value of irradiation in each control channel. At block 990, the system displays the temperature setpoint and measured value for each control channel. At block 992, the system performs the update and then returns to the main directory screen at block 900.

  FIG. 12C is a flowchart showing selection of the irradiation calibration screen, and corresponds to the irradiation calibration button 910 on the main directory screen 900. This screen allows the operator to enter calibration module reference values written by the operator during the calibration procedure described later in connection with FIG. At block 994, the operator inputs a reference value for each control channel. The system then returns to the main directory screen at block 900.

  FIG. 13 is a flowchart showing a calibration procedure according to the present invention. During this procedure, the test module installed in the door pocket is removed from the predetermined first position, and instead the calibration module is placed in the first position. Those skilled in the art will understand that a calibration procedure must be performed every 400 hours by industry standard. However, the operator may calibrate the device at any time during the test, and the calibration will be performed if the controller does not respond as the operator desires or if the lamp does not respond according to the monitor control procedure described above. It may be programmed to display a request message.

  At block 1000, the controller asks the operator if he wishes to calibrate the device. If NO, the controller enters a loop and asks again after a predetermined time. If yes, then at block 1002, the controller determines whether the test is currently running. If so, then at block 1004, the controller stores the irradiation setpoint, temperature setpoint and other test data and test time in memory prior to the procedure. At block 1006, the operator must enter calibration exposure and temperature setpoints. At decision block 1008, the controller then determines whether the measured values of irradiation and temperature match the set values and are stable. If NO, the controller then asks again at decision block 1008 after entering the loop for a period of time. If yes, then, at block 1010, the controller fixes all four outputs to the control channel ballast so that the lamp output is not disturbing.

  The test module in the first position is removed and replaced with the calibration module as described above, and the controller automatically recognizes that the appropriate sensor is in the proper position. The calibration module further automatically determines the type of UV lamp (UV-A, UV-B, UV-C) or obtains the information from the controller. If there is a discrepancy, the calibration module is determined to be correct. The calibration module generates a reference value, which must be obtained by the operator at block 1012 (ie, manually entered). The calibration module is then removed and replaced with the operational test module in the first position. It should be noted that this procedure is repeated for each test module location.

  After the procedure at each test module location, the controller asks at block 1014 whether the reference calibration data is ready to be input to the controller. If NO, then the operator obtains a calibration data reference value for the next test module position. If YES, then at block 1016, the operator enters a reference data value into the controller. At block 1018, the controller calculates a new gain value that adjusts the ballast control signal. At block 1020, the controller asks if the test was running. If YES, then at block 1022, the test irradiation and temperature setpoints are reset and the test is resumed. If no, then the controller ends the calibration procedure. Preferably, the controller includes a processing unit and a memory storing program processing, and when the program is read into the processing unit, the controller is adapted to activate the test and calibration procedures.

  FIG. 14 is a cross-sectional view of an apparatus that is an embodiment of the present invention. The apparatus 1100 includes a test chamber 1104, a test module 1106, a sample holder 1108, a lamp 1110, a door 1112, and a tank 1102 that defines a wetting system 1114. In this embodiment, the test chamber 1104 has eight lamps 1110. As described above, these lamps may be fluorescent lamps, xenon or other suitable lamps. The sample holder 1108 is located on the sample mounting device 208, which has a lower rail 208A and an upper rail 208B and is defined in a plane substantially parallel to the plane in which the lamp is defined. ing. The lamp 1110 is located away from the sample holder 1108 and as a result provides the desired weathering effect. In addition, the wetting system 1114 additionally provides a conventional weathering effect.

  The door 1112 has a pocket 1116 for mounting the test module 1106. This is advantageous in that the test module, which is a temperature sensitive electronics, is removed from the test chamber 1104 and located outside the test chamber. As a result, a very stable signal is generated, and irradiation control is more stable without signal drift. As a result, the lamp 1110 lasts for a longer period, thus reducing spending. A small gap 1118 is shown between the face of the pocket 1116 and the sample holder 1108. This avoids unwanted or unintended effects on the test procedure or results.

  FIG. 14 further shows that a portion 1020 of the test module 1106 protrudes from the surface of the pocket 1116 to detect the illumination of two adjacent lamps 1110. The end of the sensor protrusion has an input for transferring UV light to the test sensor in the test module via light pipe technology. The optical filter may be used in connection with the test sensor and may be embedded in the optical photodiode. The present invention is particularly advantageous because the input is placed in the sample holder 1108 substantially as a sample. Thus, sensor readings and associated illumination signals will accurately represent the illumination received by the sample. The test module 1106 can be removed separately from the door as described above. Further, as described above, for calibration of the weathering device, the calibration module is replaced with a test module and is co-located with the test module.

  The present invention is not limited to the description of the apparatus and method shown and described above, and other modifications and changes can be conceived. Changes may be made to the above apparatus without departing from the true spirit and scope of the present invention. For example, embodiments of the present invention may be modified or added so that all or part of the functions are performed by software. Therefore, the above-described subject matter should be construed as illustrative and not in a limiting sense.

It is a figure which shows the conventional test apparatus using a discharge lamp. (a) is a partial front view of the improved accelerated weathering test apparatus according to the present invention. (b) is a detailed perspective view of the tank part of the accelerated weathering test apparatus of (a). 1 is a schematic end view of an accelerated weathering test apparatus showing characteristics of a control channel according to the present invention. FIG. It is an upper perspective view of the test module concerning the present invention. It is a downward perspective view of the test module concerning the present invention. FIG. 3 is a top perspective view of a calibration module according to the present invention. FIG. 6 is a lower perspective view of a calibration module according to the present invention. It is a flowchart which shows a series of control of the optical sensor module which concerns on this invention. It is a flowchart which shows operation | movement of the system controller user interface which concerns on this invention. It is a flowchart which shows operation | movement of the system controller user interface which concerns on this invention. It is a flowchart which shows operation | movement of the system controller user interface which concerns on this invention. It is a flowchart which shows operation | movement of the system controller user interface which concerns on this invention. It is a flowchart which shows the calibration procedure which concerns on this invention. It is sectional drawing of the apparatus which is an Example of this invention.

Explanation of symbols

10 Lamp 12 Chamber 14 Sample 16 Moisture supply tank 200 Improved accelerated weathering test device 202 Enclosure 204 Door 205 Jack 206 Test chamber 208 Sample mounting device 210 Sample holder 212 Light source 214 External door protection unit 216 Opening 218 Pocket 220 Sensor 222 Tank 224 Side panel 226 test sensor

Claims (27)

An enclosure having at least one door for access to a test chamber provided in the enclosure;
A sample mounting portion for supporting a sample holder provided in the test chamber;
A light source array installed in the test chamber for generating light in the test chamber;
A power source for supplying power to the light source array;
With multiple automatically adjustable control channels that continuously control the output of the light source array,
Each control channel controls the output of at least one light source, and the plurality of control channels are detachably installed in a pocket formed in the door, and are configured to detect different spaces in the sample mounting portion. An accelerated weathering apparatus characterized by having a test module. Each control channel has a ballast connected to at least one light source that controls the amount of power from the power source received by the at least one light source;
A controller that is connected to the test module and the ballast, and that controls the operation of the ballast by transmitting a ballast control signal;
A test sensor included in each test module;
A transmitter that is placed in the test module, connected to the test sensor and the controller, sends the irradiation signal to the controller so that the controller adjusts the ballast control signal to maintain the irradiation signal at the desired setpoint. Prepared,
The test sensor is inserted into a hole formed in the pocket, is positioned at a corresponding position of at least one light source, detects irradiation in the test chamber from at least one light source, and generates an irradiation signal representing the detected irradiation. The apparatus of claim 1.   The apparatus according to claim 1, comprising first and second light source rows having first and second sample support walls, each row having four lamps.   The apparatus of claim 1, wherein the plurality of test modules comprises four test modules arranged in the pocket such that each test module substantially selects illumination from two adjacent lamps.   The apparatus of claim 1, wherein the plurality of control channels comprises four separately adjustable control channels.   The calibration module further detects the illumination in the test chamber and generates a reference value indicative of the detected illumination, and a reference connected to the reference sensor and input to the control channel to adjust the output of the light source array. The apparatus of claim 1 having a reference value display for displaying the value.   A temperature sensor connected to the controller that monitors the temperature in the test chamber, generates a temperature signal, and sends the temperature signal to a controller that adjusts the ballast control signal to maintain the desired illumination within the test chamber The apparatus of claim 2 further comprising:   A temperature sensor connected to the controller that monitors the temperature in the test chamber, generates a temperature signal, and sends the temperature signal to a controller that adjusts the heater control signal to maintain the desired temperature in the test chamber The apparatus of claim 2 further comprising:   The apparatus of claim 1, wherein the plurality of test modules amplifies the illumination signal to reduce frequency noise.   10. The apparatus of claim 9, wherein the frequency noise reduction is achieved by converting a high impedance signal to a low impedance signal along with gain. The controller has a processing unit and a memory that stores the program processing. When the program is read by the processing unit, the controller receives the set value input of the desired irradiation signal and starts the test procedure. This procedure is
Outputting a ballast control signal to the ballast based on a set value;
Receiving an irradiation signal input from the test module;
Adjusting the ballast control signal based on the gain between the set value and the illumination signal;
Outputting an adjusted ballast control signal;
The apparatus of claim 2 including the step of repeating the test procedure steps for a desired period of time. The controller further includes program instructions that, when read by the processing unit, cause the controller to select one of a plurality of control channels for calibration and initiate the calibration procedure. The procedure is
Disconnecting the test module associated with the selected control channel;
Connecting a calibration module having a reference sensor to the selected control channel;
Detecting, using a reference sensor, existing illumination in the test chamber by illumination from a light source generally associated with the selected control channel to generate a reference value;
Displaying the reference value on the display included in the calibration module;
Repeating the above steps for each control channel;
Entering a reference value into the controller;
Comparing reference values and setpoints associated with each control channel;
12. The apparatus of claim 11, comprising adjusting the gain of each control channel to calibrate the light source output associated with each control channel. The calibration step further comprises: using a calibration module to detect a group of lamps that generate ultraviolet radiation in the UV-A, UV-B, UV-C range;
The apparatus of claim 12, further comprising the step of automatically communicating the detected lamp to a controller. An enclosure having at least one door for access to a test chamber provided in the enclosure;
A light source installed in the test chamber for generating light in the test chamber;
A power source for supplying power to the light source, and a ballast connected to the light source and the power source to control the amount of power from the power source received by the light source;
It is connected to the test module and the ballast, and includes a controller that controls the operation of the ballast by sending a ballast control signal.
The ballast has a circuit that controls activation of the light source to apply a low pressure to the light source for a desired period of time to warm the light source before ignition, thereby minimizing impact on the light source and As the life of
The accelerated weathering apparatus, wherein the controller adjusts the ballast control signal in response to the irradiation signal received from the test module to maintain the desired irradiation in the test chamber.   The apparatus of claim 14, wherein a low voltage is gradually applied to the light source until the operating voltage is reached.   A temperature sensor connected to the controller that monitors the temperature in the test chamber, generates a temperature signal, and sends the temperature signal to a controller that adjusts the ballast control signal to maintain the desired illumination within the test chamber 15. The apparatus of claim 14, further comprising:   A temperature sensor connected to the controller that monitors the temperature in the test chamber, generates a temperature signal, and sends the temperature signal to the controller that adjusts the heater control signal to maintain the desired temperature in the test chamber. 15. The apparatus of claim 14, further comprising:   The apparatus of claim 14, wherein the controller monitors the illumination signal and adjusts the ballast control signal accordingly to maintain the desired illumination within the test chamber.   The apparatus of claim 14, wherein the desired period is at least approximately 1.5 seconds.   The apparatus of claim 14, wherein the low voltage is approximately 2-5 volts. A test chamber, a sample mounting, and a light source powered by a power source controlled by a ballast;
Each control channel includes a plurality of self-adjustable control channels that continuously control the light source output, including a test module that includes a test sensor that controls the output of at least one light source and detects illumination within the test chamber. An accelerated sample weathering test method in a test apparatus,
Detecting an existing illumination in the test chamber by illumination from a light source generally associated with the control channel using one of the test sensors to generate an illumination signal;
Transmitting an irradiation signal detected by the test sensor to a controller of the control channel;
Comparing to determine whether the illumination signal is equal to the set value;
Adjusting the ballast control signal for the ballast associated with the control channel so that the output of the light source is adjusted;
Repeating the above steps until the ballast control signal associated with each control channel is adjusted, making one cycle;
Repeating the above steps a desired number of cycles;
Selecting one of the control channels for calibration;
Disconnecting the test module associated with the selected control channel;
Connecting a calibration module having a reference sensor to the selected control channel;
Detecting an existing illumination in the test chamber by illumination from a light source generally associated with a selected control channel using a reference sensor to generate a reference value;
Displaying the reference value on the display included in the calibration module;
Immediately repeating these disconnection, connection, detection and display steps described above for each control channel;
Entering a reference value into the controller;
A step of comparing the set value with the reference value;
An accelerated sample weathering test method comprising the step of adjusting each control channel again to calibrate the light source output associated with each control channel.   Each control channel further includes a temperature sensor connected to the controller that monitors the temperature in the test chamber, and the method further includes generating a temperature signal and a desired illumination in the test chamber. 23. The method of claim 21, comprising transmitting a temperature signal to a controller that adjusts the ballast control signal to maintain.   Each control channel further includes a temperature sensor connected to the controller that monitors the temperature in the test chamber, and the method further includes generating a temperature signal and a desired illumination in the test chamber. The method of claim 21, comprising sending a temperature signal to a controller that adjusts the heater control signal to maintain.   The method of claim 21, further comprising the steps of monitoring a current draw of the ballast and adjusting a ballast control signal to maintain a desired illumination in the test chamber. A test chamber, a sample mounting, and a light source powered by a power source controlled by a ballast;
Each control channel includes a plurality of self-adjustable control channels that continuously control the light source output, including a test module that includes a test sensor that controls the output of at least one light source and detects illumination within the test chamber. An accelerated sample weathering test method in a test apparatus,
Controlling the activation of the light source by a circuit in the ballast that applies a low voltage to the light source for a desired time to warm the light source before ignition, in order to minimize the impact on the light source and extend the life of the light source When,
Detecting an existing illumination in the test chamber by illumination from a light source generally associated with the control channel using one of the test sensors to generate an illumination signal;
Transmitting an irradiation signal detected by the test sensor to a controller of the control channel;
Comparing to determine whether the illumination signal is equal to the set value;
Adjusting the ballast control signal for the ballast associated with the control channel based on the gain between the setpoint and the illumination signal so that the output of the light source is adjusted;
Repeating the above steps until the ballast control signal associated with each control channel is adjusted, making one cycle, repeating the above steps a desired number of cycles,
Selecting one of the control channels for calibration;
Disconnecting the test module associated with the selected control channel;
Connecting a calibration module having a reference sensor to the selected control channel;
Detecting an existing illumination in the test chamber by illumination from a light source generally associated with the selected control channel using a reference sensor to generate a reference value;
Displaying the reference value on the display included in the calibration module;
Immediately repeating these disconnection, connection, detection and display steps described above for each control channel;
Entering a reference value into the controller;
A step of comparing the set value with the reference value;
An accelerated sample weathering test method comprising the step of adjusting each control channel again to calibrate the light source output associated with each control channel.   26. The method of claim 25, wherein the desired time is at least 1.5 seconds.   26. The method of claim 25, wherein the low voltage is in the range of approximately 2-5 volts.

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