MEDICION DEL GROSOR DE LA PARED LATERAL DE ENVASES DE VIDRIO

REFERIDA A UN APARATO EN EL QUE EL ENVASE SE COLOCA EN UN BANO DE ACEITE QUE TIENE UN INDICE DE REFRACCION QUE COINCIDE CON EL DE LA SUPERFICIE DE LA PARED LATERAL EXTERNA DEL ENVASE. EL CUERPO DEL ENVASE ESTA ENGRANADO DENTRO DEL BANO PARA PERMITIR LA ROTACION EN TANTO SE REFRENA EL MOVIMIENTO LATERAL A MEDIDA QUE EL EXTREMO DEL ENVASE GIRA. LA ENERGIA LUMINOSA SE DIRIGE A TRAVES DEL BANO Y TANGENCIALMENTE A TRAVES DE LA PARED LATERAL DEL ENVASE DE TAL FORMA QUE SE ESTABLECE UN PATRON DE ENERGIA LUMINOSA COMO UNA FUNCION DEL GROSOR DE LA CAPA DE LA PARED LATERAL, Y EL GROSOR DE LA CAPA SE DETERMINA COMO UNA FUNCION DE DICHO PATRON LUMINOSO Apparatus for measuring glass layer thickness in the sidewall of a glass container (22) in which a container is placed in a bath (26) of oil having an index of refraction matching that of the container outer sidewall surface. The body of the container is engaged within the bath to permit rotation while restraining lateral motion as the finish of the container is rotated. Light energy is directed though the bath and tangentially through the sidewall of the container so as to establish a pattern of light energy as a function of sidewall layer thickness, and layer thickness is determined as a function of such light pattern. As applied specifically to measuring thickness of the casing glass layer in a cased glass container in accordance with the preferred method of the invention, such casing glass thickness is determined as a function of the pattern in the light energy that emerges from the oil bath.