PROCESS DEVICE WITH PROCESS VARIABLE MEASUREMENT USING IMAGE CAPTURE DEVICE

摘要

A field device (12) for monitoring a process variable of an industrial process includes an image capture device (100). A process component (106) exhibits relative motion as a function of a process variable. The image captures device (100) captures an image which changes due to the relative motion of the process component (106). An image processor (102) coupled to the image capture device (100) detects relative motion of the process component (106) and measures the process variable based upon the detected relative motion. Output circuitry (30) provides an output related to the measured process variable.