optical gage

optical gage

[′äp·tə·kəl ′gāj]
(engineering)
A gage that measures an image of an object, and does not touch the object itself.
References in periodicals archive ?
(Even coolant film on parts will distort an optical gage reading.) Typical applications of optical-electric gaging systems include preprocess control of excessive stock, intermediate-process size control (for example, on centerless grinders), and postprocess checks for dimensional control or final inspection.