公开(公告)号：US3613441A

公开(公告)日：1971-10-19

申请号：US3613441D

申请日：1970-01-19

Applicant: US ARMY

Inventor： PAPIRNO RALPH R

IPC: G01L1/02 ,  G01L1/08 ,  G01L5/12

CPC classification number: G01L1/083 ,  G01L1/02

Abstract: A LOAD TO BE MEASURED TENDS TO DEFLECT, CRUSH OR WARP A RING TYPE OF TRANSDUCER. HOWEVER, A SENSOR DETECTS THE SLIGHTEST DEFLECTION OR WARPING OF THE RING AND ACTUATES APPARATUS TO RESTORE THE RING SO THAT THE NET RESULT IS SUBSTANTIALLY ZERO DEFLECTION OF THE TRANSDUCER RING. THE FORCE REQUIRED OF THE APPARATUS, TO HOLD THE TRANSDUCER RING OR TO RESTORE THE RING TO ZERO DEFLECTION, IS PROPORTIONAL TO THE FORCE APPLIED TO THE RING. BY MEASURING THIS FORCE, BY A HYDRAULIC PRESSURE GAGE, FOR EXAMPLE, THE MAGNITUDE OF THE LOAD TO BE MEASURED CAN BE ASCERTAINED. IN SIMPLE TERMS, A "HEAVY DUTY" YET VERY SENSITIVE SCALE IS PROVIDED TO INDICATE LIGHT OR HEAVY WEIGHT OR FORCE. NEVERTHELESS, THE SENSING ELEMENT INCURS SUBSTANTIALLY ZERO DEFLECTION. AND, THIS IS TRUE EVEN WHEN COMPARATIVELY LIGHTWEIGHT AND INEXPENSIVE APPARATUS IS USED.