Photocell System

The Chadwick-Helmuth photocell system is used to accurately measure rotational position for determining phase relationship between elements of rotating devices such as propellers, rotor blades, fans and shafts at repetition rates of 0.2 to 830 pulses per second.

The photocell system measures repetition rates for rotating devices, without affecting balance, tracking or vibration characteristics of the rotating device. Retro-reflective tape is attached to the surface of the rotating device to provide a reflective target for the optical probe. The light reflected back to the probe is sent to the photocell processor for signal processing.

The photocell system's signals are unaffected by external light such as sunlight, strobe or pulse light, and other ordinary lighting sources.



Serviceable equipment is sold with our 90 day warranty and certificate of calibration traceable to NIST.

Please note that the terms and conditions of these warranties are subject to change without notice.


Current Stock

New and serviceable photocell kits and individual components in stock, please contact us for a quote.