公开(公告)号：US3560748A

公开(公告)日：1971-02-02

申请号：US3560748D

申请日：1967-04-27

Applicant: INDUSTRIAL NUCLEONICS CORP

Inventor： HATTEN BERNARD W

IPC: G01N23/16 ,  G01T1/17

CPC classification number: G01N23/16

Abstract: A nucleonic measuring gauge for cigarette tubing in which a housing contains a radiation source and has an aperture controlled by a sliding shutter, in which a U-shaped spring steel shutter lock is positioned in the path of shutter movement and has leaves which are held in an open position by a quantity of meltable material permitting the shutter to move between the leaves, and in which the spring leaves are stressed to close together behind the shutter blocking the shutter in a closed position upon occurrence of an abnormally high ambient temperature with the melting of the material.