Energy Modulators & Optical Chopper Wheels
Variable-speed rotating disk optical chopper wheels for modulating radiation from blackbody sources, tungsten filament lamps, Nernst glowers, mercury lamps, and other infrared sources. Designed for use with lock-in amplifiers in FTIR spectroscopy, radiometry, and IR detector characterization setups. Precision frequency control with interchangeable blade sets covers 1.25 Hz to 45 kHz.
IR-762
Energy Modulator
Compatible WithIR-508, IR-518 blackbodies
Display4-digit red LED, 1 Hz resolution
Freq. ControlPrecision rotary knob
Motor11-pole DC, sleeve bearing
FinishMIL-A-8625E Type II black anodized
Blades2-slot (20–200 Hz), 10-slot (20 Hz–1 kHz), 30-slot (60 Hz–3 kHz)
IR-860
High-Performance Energy Modulator
Compatible WithIR-563, IR-564, IR-574 blackbodies
Spindle Speed75 – 7500 RPM
Stability0.5% of set frequency or 0.25% of full scale over 4 hours
ControlClosed-loop brushless DC with phase sensors
Reference Output0–5 V TTL, 600 Ω
Blades10 interchangeable blades: 1.25 Hz – 45 kHz