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Brookhaven bi-200SM light scattering goniometer + laser
Brookhaven BI-200SM Light Scattering Goniometer + Laser
Manufacturer: Brookhaven Instruments Corporation
Location: Warehouse - Atlanta, GA
Functional Condition: Fully Functional
*Omnichrome 543-AP Argon-Ion Laser (s/n: 1331)
*Omnichrome Power Supply for laser, Model 160
* Stepping motor controlled, multiangle measurements
* Particle size and size distributions
* Mw, Rg, A2 for dilute polymer solutions
* Cross-correlation detector option
* Avalanche photodiode detector option
* CONTIN, Zimm, Guinier, Fractal, and more
The Brookhaven Approach to Light Scattering
Light Scattering occurs when polarizable particles in a sample are bathed in the oscillating electric field of a beam of light. The varying field induces oscillating dipoles in the particles and these radiate light in all directions. This important and universal phenomena is the basis for explaining why the sky is blue, why fog and emulsions are opaque and other observations. It has been utilized in many areas of science to determine particle size, molecular weight, shape, diffusion coefficients etc. Brookhaven Instruments' scientists have extensive experience in the development of instruments and methods for light scattering and this experience has been incorporated into the BI-200SM to make it the finest instrument available for research applications of light scattering.
With a Brookhaven Instruments BI-200SM system this rich field of exploration is open to you for studies of both Static Light Scattering (SLS) and Dynamic Light Scattering (DLS).
The Bl-200SM Research Goniometer System provides access to all of these studies with an automatic, modular and versatile system. It is a precision instrument designed for exacting scattering measurements. Based on a special turntable with precision ball bearings and stepping motor, the Bl-200SM's modern design and quality construction guarantee precise measurements due to the wobble-free movement of the detector. It is field proven in hundreds of laboratories. It is ideal for macro-molecular studies and submicron particle sizing.
The BI-200SM's modularity simplifies system expansion. Featuring a standard optical rail, the BI-200SM can be used with neutral density filters, a polarizer, an analyzer, and a reference detector. Special sample requirements can often be met by changing the cell holder design or size.
Special Features of the BI-200SM Research Goniometer System
Both DLS and SLS modes: Correlation & Intensity Measurements
Large angular Range: 8 to 155 with 25mm cells: 15 to 155 with 12mm cells.
Fine Adjustment Control: Read angle to 0.01 directly on large, fine-control adjustment knob.
Open Design/Standard Optical Rails: Facilitates user customizations for special purposes.
Temperature Control: Heating and cooling via any standard external circulator Separate temperature and filtration plumbing.
Special Design Glass Vats: Specially polished and flat entrance window ensures minimum flare.
Alignment Cell: Fine-screw vertical adjustment makes finding the center of rotation easier.
Multiple Laser Line Filters: Filter wheel with 632.8 (HeNe), 514.5/488.0 nm (Ar+), one open position for weak scatterers, and 2 blank (shutter) positions. Also available with 532 nm bandpass filter
Enhanced Viewing Optics: Coated, precision achromats coupled with behind-the-slit viewing and high-quality eyepiece make alignment easier.
Additional Alignment Aperture: Alignment of laser much simpler and faster.
Variety of Cell Holders: High precision cell holders standard, low-priced round cells available: 27.5 mm dilution vials fit cell holder sleeve. Special small-volume cell available.
In the SLS mode, time-averaged intensity measurements are made - at either fixed or variable angles - in the range from 8 to 155 and analyzed with software provided for the methods of Zimm, Berry, Debye, Guinier, Kratky etc. Such evaluations using measured angular or concentration dependencies of the intensity of the scattered light provide key information for those interested in the such topics as:
* Mw Molecular weight determinations
* A2 Determination of second virial coefficient
* Complex fluid characterization
From these DLS measurement many interesting subjects may be explored, among them:
* Particle size distributions
* Particle aggregation phenomena
* Nucleation processes & protein crystallization
Beam Focus and Steering: Includes mounts, adjustments, and apertures.
Turntable: 200 mm O.D. turntable, worm gear and ball bearings; manual or automatic selection of angles in 0.01 steps; precision machined base with mounting holes; positioning table with micrometer adjustments. (Power supply and controller for stepping motor is optional)
Specimen Cell Assembly: Including thermal enclosure, centering adjustments, separate plumbing for temperature control and index matching liquids, round cell holders, square cell holder and alignment cell.
Index Matching Vat: With optically flat and specially polished entrance window; precision machined and annealed to minimize stray light.
Periscopic Beam Stop: Located inside vat to prevent flare from exit window; provided with coupling for use with optional, zero-angle reference detector.
* Entrance aperture of 3 mm.
* Coated, adjustable achromat for focusing scattered light onto 200 micron slit. Slit position adjustable.
* Reflex mirror and high quality eyepiece for viewing scattering region through slit.
* Filter turret with 632.8, 514.5, 488.0 nm, 2 closed positions, and 1 open position. other filters available.
* Secondary pinhole turret: 100, 200 and 400 micron pinholes for DLS measurements; 1, 2 and 3 mm pinholes for SLS measurements.
A policy of continual improvement may lead to specification changes.
BI-DNDC: Differential Refractometer. New
BI-CrossCorr: Eliminate detector artifacts by cross correlation.
BI-SFS: The new BI-SFS sample filtration system provides a fast and convenient way to clean your light scattering samples, a necessity for samples smaller than 20nm. Utilizing Teflon tubing and nonreactive components, the BI-SFS is compatible with most sample filtration needs. Its modular design allows users to change pump heads and speeds to encompass virtually any possible application.
BI-APD: Avalanche photo diode, up to 10 times the sensitivity.
BI-HV: High voltage power supply.
BI-LRM: Laser rail and mounts for most lasers. Lasers are frequently supplied by the user. Contact the factory for recommendations.
BI-TCA: Temperature controller, external circulator type, -20 to 100 C, analog setting and readout, 0.2 stability.
BI-TCD: Temperature controller, external circulator type, -20 to 100 C, alphanumeric setting and readout, 0.1 stability.
BI-FC: Filtration/circulation system for index matching liquid. New gear pump and rigid Teflon tubing.
BI-RC12: Nominal 12 mm O.D. Round Glass Cell, polyethylene cap.
BI-SC: 10mm path length Glass Square Cell & PTFE cap.
BI-RC25: Nominal 25 mm O.D. Round Quartz Cell, dual Teflon tops, mounting ring.
BI-RC27: Nominal 27.5mm O.D. Dilution Vials, package of 100 with HDPE screw caps.
BI-SVC: Small-volume cell for precious samples
BI-2DS: Reference detector including mount. Is recommended for use with Bl-ZP software when laser drift is greater than 1% and/or when measuring samples that absorb strongly
BI-PA: Polarization Analyzer, Glan-Thompson prism, 5x10 -6 extinction, 2-position mount.
BI-Spec/Adap Inquire about adapting parts of your existing light scattering system.
1. Laser rail and mounts, optional
5. Upright for 2 mm alignment aperture
7A,B. Center of rotation adjustment screws
7C. Center of rotation locking screw
8. Center of rotation adjustment table
9. Beam focusing and steering lens assembly
12A. Lens adjustment, horizontal
12B. Lens adjustment, vertical
13A. Slit adjustment, horizontal
13B. Slit adjustment, vertical
