Category : Optics (components, coatings, instruments and systems) > Optical instrumentation, systems and accessories

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Precision Light Chopper

General
The model 197 is a compact, high performance, low-cost optical chopper, offering features and benefits that are ideal for use in modern photometric systems.

The unit is self contained, comprising a dual aperture chopper blade, motor and the necessary driving electronics. Each aperture provides an independent reference output allowing simultaneous dual frequency operation (10:1 ratio) or dual-path experiments. Frequency control is by a precision internal oscillator set by a 4-digit push-button selector on the unit or by the application of an external AC reference signal. The unit is powered via a remote line power supply.

Mounting holes are provided in the base and right-hand side of the housing (viewed from the front) to allow for mounting the model 197 onto an optical bench or support rod.

Quartz Crystal Frequency Accuracy and Stability
The model 197, in common with all SIGNAL RECOVERY light choppers, uses a quartz crystal oscillator as its primary frequency standard. The oscillator signals is divided down to yield the required chopper frequency, and then the motor speed is continuous adjusted to phase lock the actual chopper frequency to this required value. The result is a chopper with an output frequency as stable as other modern frequency sources.

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