C-995 Optical Chopper
- 4 Hz to 5KHz Optical Chopper with Closed Head (5/8” Apeture) and 3/30 Slot Blade
- Crystal Controlled Frequency
- Large 5 Digit LED Display
- Frequency resolution of 0.001 Hz
- External Clock Synchronization
- Covers 4 Hz to 5 KHz frequency range with only one blade
- Computer Interface for easy control
- Enclosed Chopper Blade
The C-995 Optical Chopper is a microprocessor-based control system that uses direct-digital-synthesis to deliver precise optical chopping rates from 4 Hz to 5000 Hz.
The C-995 Chopper is designed with a phase-locked-loop control system, which allows the chopping rate to also be synchronized to a user-supplied external clock ranging from 4 Hz to 5 KHz. The controller is then used to measure and display the frequency of the external clock.
The C-995 optical chopping head is attached to the controller by means of a 10 foot (3 metre) coiled cord. The precision etched blade is fully enclosed for protection from inadvertent damage. (An optional exposed or open head version is also available.)
There are two apertures on the chopper head and two sections (30 slots and 3 slots) on the blade for the high and low-frequency ranges, respectively. The aperture diameter is 15 mm with a slot width of 4.5 mm for the 30 slot section and 30 mm for 3 slot section. The small 4.75 inch (12 cm) square outline and two-inch (5 cm) maximum depth of the chopper head permits easy integration into compact optical setups. Dual #8-32 mounting holes permit the apertures to be placed at a height as low as 0.75 inches (1.9 cm) above an optical bench, or with the included 1/2 inch rod and stand, as high as 13 inches (33 cm) above the mounting surface.