Optical filter wheel CAIRN RESEARCH

The Cairn Optospin fast stepping / spinning filter changer (a.k.a. the rotor) is designed with both photometric and imaging systems in mind. It can be configured with either three or six filter positions, allowing for simultaneous use of several dyes. Unlike previous versions of "the rotor" the Optospin accepts 25mm filters making it suitable for both excitation and emission wavelength changing. The microprocessor control unit allows the operation to be "tuned" to the application, giving fine control over the acceleration speed, degree of damping etc.

Continuous spinning mode is our recommended rotor based solution for photometric measurements, and rotor speeds from less than 2 to over 100 revolutions per second are routinely possible with this system. Each filter position can also be discontinuously selected, with switching times of 35msec between adjacent positions or 55msec between opposite wheel positions. The low end of the spinning speed range allows synchronous spin with a video camera at normal frame rates and the discontinuous stepping mode is ideally suited to wavelength selection for imaging applications.

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