Abstract: A non-intrusive position detector is provided. In one embodiment, a system includes a valve having a main body and an actuator to control flow through the valve. The actuator can be disposed within an actuator housing coupled to the main body. The system also includes a position detector including a camera mounted inside a detector housing. The detector housing can be installed over an aperture in the actuator housing such that the actuator within the actuator housing is in view of the camera through the aperture. A processor can be used to determine the position of the actuator from image data collected by the camera. Additional systems, devices, and methods are also disclosed.