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

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)
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 IR-860

IR-860

High-Performance Energy Modulator

Compatible WithIR-563, IR-564 blackbodies
Spindle Speed75 – 7500 RPM
Stability0.5% of set frequency 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
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Need a Specific Frequency Range or Blade Configuration?

Interchangeable blades cover 1.25 Hz to 45 kHz. Table mounts and custom configurations available. Contact us for your application.

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