Group: Newport
Catalog excerpts
S p e c t r o s c o p y I n s t r u m e n t s 1321 Email: sales@newport.com • Web: newport.com MONOCHROMATORS AND SPECTROGRAPHS SINGLE CHANNEL DETECTION SYSTEMS MINISPECTROMETERS BENCHTOP SPECTROMETERS AND CCD CAMERAS FT-IR SPECTROMETERS ACCESSORIES FOR SPECTROSCOPY INSTRUMENTS These are our stand alone chopper systems; each system includes a chopper controller and chopper head. Chopper blades are sold separately. They modulate a continuous wave source for detection by pyroelectric and other detectors, and by a digital lock-in. You can lock the chopper on a reference signal and control the phase. Note, the Oriel Merlin™ Digital Lock-in controls Oriel choppers, so there is no need to buy one of these systems which includes the controller; refer to page 1222 for Merlin™ Choppers. Note, also, that the Apex chopper system (see page 152) can be used as a stand-alone unit. Open or Closed Chopper? We offer two types of Chopper Systems: open and closed. Both chopper systems use the same controller, and most of the same wheels. Open chopper system • Less expensive • Lets you chop multiple beams simultaneously with dual chopper wheels • Rod mountable Enclosed Chopper System • Chopper blade is enclosed; provides safer operation • Safeguards against hazardous scattered light from high intensity sources • Has 1.5 Inch Series flanges for direct coupling to Oriel Light Sources or Detectors • Offers on/off “shutter” frequency Chopper Wheels We offer two types of chopper wheels: single and dual aperture. Both are 5 inch (128 mm) diameter wheels with standard aperture patterns. The single aperture models fit in either chopper head; the dual aperture models are only usable in the open chopper head. Use the dual aperture models to chop multiple beams simultaneously. The wheels are precision etched, and coated with a broadband absorber to minimize retroreflections. You can vary the chopping frequency with the controller. In any situation, the maximum chopping rate depends upon: 1. Beam diameter, which determines the maximum number of apertures you can use (see Fig. 1) 2. Maximum rotation rate of the motor: 80 rps for continuous duty operation. The Chopper Wheels Table shows the number of apertures, maximum chopping frequency and beam diameter limit for each wheel, at full modulation. If the beam size is limiting the chop rate, consider focusing the beam at the chopper to reduce the beam size. This allows you to use a wheel with more apertures, and therefore get a higher chop rate. SINGLE APERTURE CHOPPER WHEEL DUAL APERTURE CHOPPER WHEEL SLOTS FOR BLADE POSITION LARGEST BEAM JUST FITS INSIDE OF APERTURE Fig. 1 The largest beam fits just inside the aperture with its edge at the aperture edge. This is the largest beam which is fully blocked by the blade. With two blades, you can use the slots to rotate one blade with respect to the other, to choose the duty cycle. • Variable frequency, sub-Hz to 2400 Hz • Digital display of true frequency; accurate to ±1 digit • Dual aperture wheels for sum or different frequencies • Phase control to a reference • On/Off stop capability Oriel Optical Choppers 75159 Open Chopper System with Dual Aperture Chopper Wheel
Open the catalog to page 11322 Phone: 1-800-222-6440 • Fax: 1-949-253-1680 S p e c t r o s c o p y I n s t r u m e n t s MONOCHROMATORS AND SPECTROGRAPHS BENCHTOP SPECTROMETERS MINISPECTROMETERS SINGLE CHANNEL DETECTION SYSTEMS AND CCD CAMERAS ACCESSORIES FOR FT-IR SPECTROMETERS SPECTROSCOPY INSTRUMENTS 1.0 (25) 3.0 (76) 3.9 (99) 2.8 (71) 3.3 (84) SAME MOUNTING HOLE PATTERN AS 75158 75159 OPEN CHOPPER 75158 ENCLOSED CHOPPER (FRONT VIEW) 1.0 (25) 1.5 INCH SERIES MALE FLANGE 5.75 (146) 4.4 (112) 2.7 (68) 4.0 (102) 5.4 (137) 75158 ENCLOSED CHOPPER (REAR VIEW) 1.25 (32) 2.0 (51) 1.0 (25) 1.5 (38) 3.0 (76) 2.57 (65) 0.25...
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