Choppers

Optics & Photonics

Optical Chopper/Shutter offers 10 ms response with no click.

April 23, 2013

Featuring variable frequency from DC–25 Hz, Model CH-62 consists of blade mounted on motor with limited rotation angle. Current in one direction will set chopper to open position, while current in other direction will set chopper to close position. In internal mode, CH-62 is used as variable low frequency chopper with frequency set by internal oscillator adjustable from 1–25 Hz. In external mode, CH-62 is used as chopper or shutter and is controlled by external TTL signal input up to 25 Hz.  Read More

Optics & Photonics

Optical Chopper offers frequency stability better than +/-0.1%.

July 26, 2002

Variable frequency Optical Chopper utilizes Dual Phase Lock-In Amplifier to allow greater offset before saturation of gains settings. Blades are 102 mm diameter, chemically blacked, photo-etched discs that allow for operation frequency range of 5 Hz to 20 kHz. They come in 2, 5, 10, 30, and 200 slots. LED display provides direct read-out of chopping frequency, which is set by adjusting 10-turn dial or by applying and external, BNC control input. Read More

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