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chromatography • spectroscopy 33

Scripting language increases power of spectrometer

Steeper and ‘cheaper’ optical filters for Raman spectroscopy

In Raman spectroscopy applications, a laser beam is used to create Raman scattered light from a sample under test. The Raman ‘finger print’ is measured by a spectrometer. Optical filters are critical components in Raman spectroscopy systems to prevent undesired light from reaching the spectrometer. There are four basic types of filters

Now available for Ocean Optics’ Jaz modular sensing system, Jaz Scripting Language (Jaz-SPL),enables users to customise spectrometer data acquisition, processing and export functions. Jaz is a family of stackable

components that share common electronics and communications. Included in the Jaz stack is a CCD-array spectrometer that can be optimised for a variety of measurements and a microprocessor with display. With Jaz-SPL, the power of

its onboard microprocessor can be harnessed with scripts for simple data acquisition, processing and export of results to an SD card. An Ethernet-equipped Jaz can be remotely controlled by a PC, or the Jaz can run the script from an SD card with no need for a PC. As a reference point for starting new scripts, sample scripts and a

programming language reference manual are included with the software. The modular design of the Jaz

family, with user-selected grating and slit options optimised for a variety of application needs, allows it to be customised for a range of applications in field, lab or process environment. With the new software, users will

be able to further tailor measurements to their requirements, without any special programming knowledge. Ocean Optics’ optical sensing

technology enables diverse applications in medical and biological research, environmental monitoring, life science, and science education. Its complementary technologies includes spectrometers, chemical sensors, metrology instrumentation, optical fibres and thin films and optics.

For more information, visit

Fig. 1. Example of a 633nm high performance LPF.

to choose from: LPF (long pass) edge filters, SPF (short pass) edge filters, notch filters and laser-line filters. Laser-line filters are an obvious choice as laser transmitting filters, and notch and edge filters can both be used as laser blocking filters. Which one you choose depends on the application. If both stokes and anti-stokes Raman

scattering should be measured simultaneously one would choose a notch; if we are looking at the smallest stokes shifts, one would choose a steep edge filter. Iridian Spectral Technologies offers

the steepest edge pass filter on the market. For a regular edge pass filter, the Raman shift goes from 100 to 50cm-1. If you wish to see stokes and anti-

stokes at the same time, the notches offer a very good solution.

Enter 33 or ✔ at

Iridian Spectral Technologies based in Ottawa, ON, Canada.

Fig. 2. This is what it allows you to do. Graphing software allows easy access to data for clear presentations

SigmaPlot graphing software from SYSTAT goes beyond simple spreadsheets to help you show off your work clearly and precisely. With SigmaPlot, users can produce high-quality graphs without spending hours in front of a computer. SigmaPlot offers seamless Microsoft

Office integration, so you can easily access data from Microsoft Excel spreadsheets and present your results in

Microsoft PowerPoint presentations. Graph creation starts with

SigmaPlot’s interface. Take advantage of industry-standard menu design, menu toolbars, right mouse button support and graph preferences. Select the graph type you want to create from the Graph Toolbar’s easy-to-read icons. The interactive Graph Wizard leads you through every step of graph creation.

You get compelling, publication-quality charts and graphs in no time. Some of the key new features are:

more than 100 2D and 3D technical graph types; customise every detail of your charts and graphs; quickly plot your data from existing graph templates in the Graph Style Gallery; 50 of the most frequently used statistical tests in scientific research by integrating SigmaStat into

one application; share high-quality graphs and data on the web; enzyme kinetics previously an add on module now built into Sigmaplot v12.

Enter 33A or ✔ at

Systat Software Inc is based in Hounslow, Middlesex, UK.

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