SAI Modulated Arc Lamp

The SAI™ Modulated Arc Lamp has been developed as part of a system for both visualization and measurement of complex airflows with small, neutrally-buoyant soap bubbles. In particular, it provides an intense, collimated light beam of uniform intensity which can be modulated over a wide range of frequencies. This allows the motion of the bubbles to be determined from speeds as low as 2 fps to speeds as high as 200 fps or more. For different flow situations, the beam can be readily modified to optimize the lighting.

	SAI™ MODULATED ARC LAMP ALS-300/SW The SAI™ Modulated Arc Lamp has been developed as part of a system for both visualization and measurement of complex airflows with small, neutrally-buoyant soap bubbles. In particular, it provides an intense, collimated light beam of uniform intensity which can be modulated over a wide range of frequencies. This allows the motion of the bubbles to be determined from speeds as low as 2 fps to speeds as high as 200 fps or more. For different flow situations, the beam can be readily modified to optimize the lighting.



	The principal component of the Modulated Arc Lamp is the SAI™ Optical Shroud. Our current Model OS 300-3 is designed expressly for use with the PE300 Watt Cermax Lamp manufactured by PerkinElmer Optoelectronics. This unique unit is a xenon-filled, short-arc lamp containing an integral reflector. The Cermax Lamp is housed in the PerkinElmer HX2 Frame and powered by the PerkinElmer PS300-13 Laboratory Power Supply.


	SWITCHER POWER SUPPLY ON ROLLING STAND

	The Optical Shroud, itself, contains three basic elements: (i) A condensing lens, (ii) a special aperture cradle and (iii) a projection lens assembly. The condensing lens serves to redistribute the light emitted by the Lamp more uniformly and a special Aperture, to change the cross-section shape and size of the beam. The third element, the Projection Lens Assembly, focuses an image of the Aperture at the desired distance from the system. A handle on the Aperture extends outside the Optical Shroud for insertion, removal and adjustment. The Lamp Holder is mounted inside a rectangular Light Shield to eliminate any stray light coming from the Holder. A Handle is provided on top of the Light Shield to carry and reposition the Optical Shroud. Also, the Light Shield Base has bumper feet for general support on any flat surface.


	SAI™ OPTICAL SHROUD MOUNTED TO ROLLING STAND
	The Model PS300-13 Laboratory Power Supply is a new switcher design by PerkinElmer Optoelectronics. For a long time, Sage Action, Inc. has used the ILC Technology Model PS300-1 Power Supply and associated components with our various SAI™ Optical Shroud designs to observe continuous bubble trajectories for general airflow patterns. To measure velocities, though, it is necessary to modulate the light output. Initially, we developed an external unit, but later we developed the smaller internal SAI™ VMC-2 Arc Lamp Modulator. This unit was completely integrated into the PS300-1 and worked extremely well. Still, this modification was fairly complex and costly. The new PS300-13 eliminates these disadvantages. In fact, it is a user programmable lamp power source. There are three membrane switches on the front panel labeled "MENU", "A" and "B". These switches permit selection of four operating modes: Continuous Current Supply Mode, Variable Time Mode, Internal Modulation Mode and External Modulation Mode. The four modes and their functions are monitored from the front panel by means of a LCD Display. The Display is 4 Lines x 20 Characters wide with blue background and white text. This is very convenient to work with, not only for the status and data it provides, but also the directions for operation. Output current to the Lamp is supplied by two Multi-Contact Powerline Series connections on the front panel, and power to the fan and lamp interlock on the lamp frame, by a 4 pin socket connector. Although not used at present, there is a 9 pin D-subminiature connector for remote input and two 2mm sockets for external modulation input. Altogether, the new PS300-13 offers a great replacement to the PS300-1 with a VMC-2. It is extremely compact and light, being a small fraction of the size and weight of the ILC PS300-1. Sage Action, Inc. has worked cooperatively for many months on this effort with PerkinElmer and we believe our Customers will find the new SAI™ Modulated Arc Lamp with the new PE Power Supply really “user friendly”. This, in turn, enhances the application of our MAL for non-invasive velocity measurements of the instantaneous flowfield along the “natural” streamlines.

	INDIVIDUAL SPECIFICATIONS - *SAI™ OPTICAL SHROUD / MODEL OS 300-3* Circular Beam Spread: 3" - 25" Dia @ 6' Iris Diaphragm Diameter: 1/8" - 1 1/2" Rectangular Beam Spread: 19" x 0" - 19" x 6 1/2" @ 6' Adjustable Slit Width: 0" - 7/16 " Focusing Range: 28" - Infinity Projection Lens Focal Length (Each): 220 mm Lamp: PE300 Watt Cermax Lamp Cooling: Forced Convection Average Bulb Life: 1000 Hrs Overall Dimensions: 21" L x 5 1/2" D x 8 3/4" H Base Mounting Plate: 8" L x 5 1/2" W x 1/2" T w/ Two 1/4-20 UNC Threaded Inserts Holder Cable Length: 10' Overall Weight: 10 Lbs XENON ARC LAMP Beam Half Angle @ 0 Hrs: 5º / Visible Output @ 0 Hrs: 5000 lm Beam Half Angle @ 100 Hrs: 6º / Visible Output @ 100 Hrs: 3500 lm Beam Half Angle @ 1000 Hrs: 7º / Visible Output @ 1000 Hrs: 3250 lm PERKIN ELMER SWITCHER POWER SUPPLY MODEL PS300-13 Line Voltage: 100 - 240 Vac Maximum Line Current: 7 Aac Line Frequency: 50/60 Hz Starting Pulse, Voltage: 30 KV Lamp Voltage, Operating: 13 - 16 Vdc Lamp Current, Operating: 4 - 24 Adc Overall Dimensions: 12" D x 10" W x 7" H Overall Weight: 7 1/4 Lbs Operating Temperature Range: 6°C - 45°C Storage Temperature: (-20°C) - (85°C) Markings: UL and CE (PENDING) INTERNAL MODULATION Current "OFF TIME": 100 - 30,000 μSec Current "ON TIME": 100 - 42,000 μSec Modulation Depth: 0 - 84% (Rectangular Waveform) The Modulation Depth MD is the ratio of the change in high lamp current Ih to the low lamp current Il. Maximum attainable modulation depth depends on the individual lamp characteristics, the lamp on time Th, the off time Tl and the high lamp current Ih.