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Digital Light Intensity Controller

Digital Light Intensity Controller
2Pages

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226 Phone: 1-800-222-6440 • Fax: 1-949-253-1680 L i g h t S o u r c e s TECHNICAL REFERENCE MONOCHROMATOR AND INCANDESCENT SOURCES ARC SOURCES DEUTERIUM SOURCES CALIBRATION SOURCES FIBER ILLUMINATORS PHOTOLITHOGRAPHY SOLAR SIMULATORS INSTRUMENTS ACCESSORIES FOR ORIEL LIGHT SOURCES Oriel Digital Light Intensity Controller 68950 Digital Light Intensity Control Box (right) with Arc Lamp Power Supply. The 68950 is a light intensity controller and digital timer in one. The light intensity controller maintains a constant light output from your arc, deuterium and quartz tungsten halogen lamps, and the digital timer allows timed exposures and dose control. RS-232 communications allow computer controlled operation. The control box of the 68950 houses the light intensity controller and the digital timer. The large LED readout displays timer and light intensity controller (LIC) information. Do I Need A Light Intensity Controller? Our power supplies are highly regulated; they operate lamps at constant current or power, even if the line voltage changes over a wide range. Even with lamp current constant, the light output of many lamps varies with age, filament or electrode erosion, gas adsorption or desorption, and, particularly for mercury lamps, ambient temperature. Both the total output and the distribution of power between the spectral lines from a mercury lamp change with temperature. These effects cause output variations with time, with different and sometimes pronounced frequency dependence. Even the relatively simple quartz tungsten halogen lamps exhibit output variations: evaporation and halogen cycle redeposition of tungsten constantly change the microstructure of the filament. The 68950 corrects for these lamp output changes, maintaining a constant, long term output, from the lamp. Fig. 1 shows the marked improvement in output stability when a 68950 is used. 0 20 40 60 80 100 120 140 160 0.990 0.992 0.994 0.996 0.998 1.000 1.002 1.004 1.006 1.008 1.010 TIME (Hour) 75 Watt Xe with 68950 75 Watt Xe RADIANT INTENSITY Fig. 1 Intensity of arc lamp under 68950 control, and without 68950 control Works With these Oriel Power Supplies Model Description 69907 50 to 200 W Universal Arc Lamp Power Supply 69910 200 to 500 W Mercury Arc Lamp Power Supply 69911 200 to 500 W Xenon Arc Lamp Power Supply 69920 450 to 1000 W Universal Arc Lamp Power Supply 69922 800 to 1800 W Universal Arc Lamp Power Supply 69931 40 - 250 W Radiometric Power Supply 69935 160 - 1100 W Radiometric Power Supply 68840 68840 Deuterium Lamp Power Supply 0 20 40 60 80 1.000 1.002 1.004 1.006 1.008 1.010 RELATIVE INTENSITY TIME (Hours) WITH 68950 CONTROL WITHOUT 68950 CONTROL Fig. 2 Intensity of QTH Lamp under 68950 control, and without 68950 control. Mounting We recommend that you rod mount the light sensor as shown in Fig. 3, using a 5° Wedge, (such as our 44645 BK7 Glass or 44899 Fused Silica Wedge) to split off part of the beam. The normal surface reflection off the substrate is enough to “pick-off” a portion of the beam for monitoring by the 68950 sensor. You can also use a beamsplitter at 45°, but you may need to attenuate the light hitting the sensor with an aperture, diffuser or filter, depending upon the reflectance of the beamsplitter. The 7123 Mount holds a 1 inch (25.4 mm) diameter optic at the input of the light sensor. Another method of monitoring the light output, if you have plenty of light to spare, is to use an integrating sphere at the output of the source, and mount the light sensor on one of the sphere’s ports. Both of the methods described above maximize the performance from the 68950, as you are monitoring the output • Light intensity controller and digital timer in one • Ensures stable long term output from arc, deuterium and quartz tungsten halogen lamps • Dose control • RS-232 communications

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227 Email: sales@newport.com • Web: newport.com L i g h t S o u r c e s TECHNICAL REFERENCE CALIBRATION SOURCES DEUTERIUM SOURCES ARC SOURCES INCANDESCENT SOURCES MONOCHROMATOR AND FIBER ILLUMINATORS SOLAR SIMULATORS PHOTOLITHOGRAPHY INSTRUMENTS ACCESSORIES FOR ORIEL LIGHT SOURCES 5° WEDGED BEAM SPLITTER SAMPLING SURFACE AT 10° TO BEAM LIGHT INTENSITY CONTROLLER SENSOR HEAD 7123 FILTER HOLDER LAMP HOUSING Fig. 3 Ideal mounting configuration for 68950 Light Sensor. Accessories You can remotely control the 68950 or 68945 via a push button switch, model 68955. Specifications AC Input 115/230...

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Digital Light Intensity Controller 2Pages

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Digital Light Intensity Controller
2Pages