foerfaringssaett foer control of any upptraedande, not oenskvaerda formfoeraendringar in a manufactured product

摘要

PCT No. PCT/SE87/00232 Sec. 371 Date Nov. 2, 1988 Sec. 102(e) Date Nov. 2, 1988 PCT Filed May 12, 1987 PCT Pub. No. WO87/07363 PCT Pub. Date Dec. 3, 1987.A method for monitoring a product under manufacture for possible deformation or changes in shape. In accordance with the method there is produced at given time intervals a series of halographic product images from which the rate at which possible changes in deformation take place in time can be estimated or evaluated. These estimated values relating to the rate of deformation and the rate of progressive changes therein are extrapolated so as to obtain the final value of the deformation of the product in relation to the state or form of the product immediately subsequent to the time of its manufacture. The process of manufacture is controlled on the basis of this final value, and the product is preferably cooled forcibly prior to producing the series of images.