Enclosed Head Optical Choppers
Enclosed Head Optical Choppers
- Complete chopper system for spectoscopy applications
- Enclosed choppoer head for Oriel mounting flanges
- Stable and reliable phase locking
- Includes 4 broadband absorber coated chopper wheels
Complete Chopper System for Spectoscopy Applications
Functional block diagram for Model 75160NF Optical Chopper SystemThe 75160NF comes complete four chopper wheels, an enclosed chopper head with Oriel mounting flange, and a chopper controller with USB 2.0 interface. All it require to run is connect power cable and its ready for chopping action.
Stable and Reliable Phase Locking
For stable chopping with minimum jitter and drift, the chopper head uses precision photo-etched wheels mounted on a high-quality DC motor. In addition, the chopper controller has its own internal crystal-controlled frequency synthesizer and phase-locked loop for precisely locking the chopping frequency. A photo-interrupter on the chopper head monitors the chopping frequency, and the chopper controller actively stabilizes the motor speed to ensure stable chopping with a minimum of frequency drift.
Enclosed Chopper Head
Dimensions of Oriel Optical Chopper HeadThe controller drives the chopper head containing a multi-aperture wheel to modulate the light. The chopper head includes Oriel 1.5-inch series flanges, which couple to a wide variety of Oriel instruments. Chopper wheels are easily interchangeable. The enclosed chopper head design prevents detector saturation from unchopped background light and prevents scattering. When chopping lasers or UV beam, you can reduce potential hazards by enclosing the beam path.
Four Broadband Absorber Coated Chopper Wheels Included
Maximum beam diameter is dependent on wheel aperture size.The 75160NF comes with four chopper wheels. Oriel chopper wheels are precision etched, and coated with a broadband absorber to minimize retroreflections. The chopping rate may be set from 4 Hz to 2.00 kHz depend on the chopper wheel.
Advanced Optical Chopper Controller
The front panel display of the controller allows monitoring of the chopping frequency, as well as a number of other operating parameters. Easy-to-use cursor keys provide easy adjustment of operating parameters. The chopping rate may be set from 4 Hz to 2.00 kHz, using either the internal frequency synthesizer or an external source as the reference. Chopping mode options are selectable at the fundamental, a harmonic (2 to 15), or even a sub-harmonic (1/2 to 1/15) of the reference.
产品规格：
| INTERNAL SYNTHESIZER | |
|---|---|
| Stability | 100 ppm after one hour warm-up |
| Drift | Less than 10 ppm/°C |
| Accuracy | < 1/5 of least significant digit |
| Resolution | 3 significant digits |
| Range limits (EXT) | 4 Hz to 2.00 kHz |
| REFERENCE INPUT | |
| Input Type | Sync InTTL-level pulse |
| Frequency Limit | Same as internal oscillator |
| Pulse width | ≥ 1 µs |
| REFERENCE OUTPUT | |
| Sync Out |
TTL level square wave May be used as free-running oscillator when using EXT+, EXT- or Vext Sync setting |
| Fouter | TTL-level square wave at the chopping frequency |
| OUT 1 |
TTL level pulse: 5*Fouter in NORMAL mode (H/S)*Fouter in H/S mode |
| OUT 2 |
TTL level pulse: [H/(7*S)]*Fsync in H/S mode |
| PHASE SHIFTER | |
| Range | -180.0° to +179.0° |
| Resolution | 0.1°, increasing to 0.25° at 2.0 kHz |
| HARMONIC LOCKING | |
| Harmonic (H) | 1 to 15 |
| Subharmonic (S) | 1 to 15 |
| EXTERNAL VOLTAGE CONTROL | |
| Voltage | 0 to 10.0 VDC |
| Control Range | 0 to 100% of maximum chopping frequency |
| GENERAL | |
| Net Weight | 2.59 kg [5.7 lbs], including chopper head |
| Electrical Ratings |
100 to 240 VAC, 50 to 60 Hz 25 Watts |
| Operating Environment |
10°C to 40°C [50°F to 104°F] ≤ 90% humidity, non-condensing |
| Storage Environment |
0°C to 50°C [32°F to 122°F] ≤ 90% humidity, non-condensing |
| Altitude | < 3000 meters [10000 feet] |
| Pollution Degree |
2 |