公开(公告)号：US3899254A

公开(公告)日：1975-08-12

申请号：US38432373

申请日：1973-07-31

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： DIXON GEORGE D ,  DAVIES DAVID H ,  VOYTKO JOHN D

IPC: G01J1/48

CPC classification number: G01J1/48

Abstract: A solution is formed of a polymer which degrades in the presence of light and a photograding compound which degrades the polymer when exposed to light. A non-photo-reducible dye may be included in the solution to filter out unwanted wavelengths. When the solution is exposed to light, the polymer is degraded and the viscosity of the solution is lowered. The solution is conveniently packaged in a sealed tube with a bubble of a noninterfering gas, and the viscosity of the solution is determined by timing the rise of the bubble. The amount of light striking the meter may be determined by comparing the time required for the gas bubble to rise in the tube with the time required for a bubble to rise in identically filled tubes exposed to various known quantities of light.