NESTED BINARY CODE SYMBOL

摘要

A nested binary code symbol (200) comprising a boundary binary code symbol (110) and at least a core code symbol (120) that provides encoded data, wherein the core code symbol (120) is nested within and concentric with the boundary binary code symbol (110) The boundary binary code symbol (110) is rectangular with a continuous outer perimeter, two data regions along adjacent sides of the rectangle, and a utility region adjacent each side opposite the data regions. Each data region is made up of a number of data cells, and each utility region is made up of utility cells with alternating appearance. There are two distinct finder cells on opposite comers of the rectangle, which can be used to orient the symbol. A non-linear strain gage for measuring the strain on an object under load include a target, a sensor, and a computer, wherein the target is a nested binary code symbol (200).