Patent ID: 9733193
Date: 2017-08-15
CPC Classifications: G01B,G01N

Claim:
1. An apparatus for non-contact measurement of the dimensional parameters of an elongated, non-guided industrial product being extruded continuously in free space, comprising: a source of terahertz radiation; a scanner system for scanning the product with a curtain of parallel rays of said radiation across the product from one side thereof; a sensor for detecting the composition of emitted radiation following its passage through said extruded product, positioned opposite said scanner system; and an image analyzer unit operatively associated with the sensor for performing time related imaging analysis of said emitted radiation thereby to determine said dimensional parameters, characterized in that said analyzer incorporates a processor for computing correction data representative of variation in the transit times between the rays in different positions in the curtain of parallel rays crossing the product as its position varies therein, due to swaying in its path of travel or other factors, said processor being adapted to provide time related correction signals that account for the variation in transit times between the rays for each ray and the movement of the product to said analyzer to equalize the transit times of the rays crossing the product thereby to improve the accuracy of the dimensional parameters of the product being measured.