Binary code symbol for non-linear strain measurement and apparatus and method for analyzing and measuring strain therewith
First Claim
1. A rectangular binary code symbol for non-linear strain measurement, comprising:
- a solid, continuous perimeter;
first and second data regions along adjacent sides of the perimeter, each data region comprising a number of data cells, each data cell representing a single bit of binary data;
first and second utility regions along adjacent sides of the perimeter opposite the first and second data regions, each utility region comprising a number of utility cells of alternating appearance;
first and second finder cells at opposite corners of the rectangle; and
inner and outer quiet regions distinguishing the first and second data regions, the first and second utility regions, and the first and second finder cells from their background.
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Abstract
A binary code symbol for non-linear strain measurement designed specifically for perimeter-based deformation and strain analysis. The symbol 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. The inner half of the utility regions can be used to store auxiliary information and/or codes. There are two distinct finder cells on opposite corners 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 in accordance includes a target, a sensor, and a computer, wherein the target is a binary code symbol.
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Citations
18 Claims
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1. A rectangular binary code symbol for non-linear strain measurement, comprising:
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a solid, continuous perimeter;
first and second data regions along adjacent sides of the perimeter, each data region comprising a number of data cells, each data cell representing a single bit of binary data;
first and second utility regions along adjacent sides of the perimeter opposite the first and second data regions, each utility region comprising a number of utility cells of alternating appearance;
first and second finder cells at opposite corners of the rectangle; and
inner and outer quiet regions distinguishing the first and second data regions, the first and second utility regions, and the first and second finder cells from their background. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A non-linear strain gage comprising:
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a target associated with an object for which at least one of strain and fatigue damage is to be measured and emitting a detectable physical quantity, the target comprising a rectangular binary code symbol for non-linear strain measurement, the binary code symbol including;
a solid, continuous perimeter;
first and second data regions along adjacent sides of the perimeter, each data region comprising a number of data cells, each data cell representing a single bit of binary data;
first and second utility regions along adjacent sides of the perimeter opposite the first and second data regions, each utility region comprising a number of utility cells of alternating appearance;
first and second finder cells at opposite corners of the rectangle; and
inner and outer quiet regions distinguishing the first and second data regions, the first and second utility regions, and the first and second finder cells from their background;
sensor means for pre-processing the detectable physical quantity emitted by the target and output data representing the physical quantity, the sensor means being compatible with the detectable physical quantity;
means for analyzing the data output by the sensor means to define the binary code symbol; and
means for measuring the strain on the object directly based on the pre-processed and analyzed data. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of measuring strain on an object directly, comprising the steps of:
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associating a binary code symbol with an object in such a way that deformation of the binary code symbol and deformation under load of the object bear a one-to-one relationship, wherein the binary code symbol emits a detectable physical quantity and includes;
a solid, continuous perimeter;
first and second data regions along adjacent sides of the perimeter, each data region comprising a number of data cells, each data cell representing a single bit of binary data;
first and second utility regions along adjacent sides of the perimeter opposite the first and second data regions, each utility region comprising a number of utility cells of alternating appearance;
first and second finder cells at opposite corners of the rectangle; and
inner and outer quiet regions distinguishing the first and second data regions, the first and second utility regions, and the first and second finder cells from their background;
identifying the changes in the binary code symbol as a function of time and change in the load applied to the object; and
translating the changes in the binary code symbol into a direct measurement of strain. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification