Pangolin Quickshow is the most used software for laser shows, thanks to its ease of use and performances. The FB3 controller included with the software enables to control a laser projector using the ILDA standard protocol and is connected to the computer with USB.
The analyst uses a point-counting grid, which is available in several forms. It can be a grid pattern printed on a transparent sheet that can be placed over a printed micrograph or projected onto a live microscope image using a camera lucida. Alternatively, analysts can use a graticule or reticule (a small, calibrated glass disc) placed inside the microscope's eyepiece. The standard does not mandate a specific grid design; any grid with an array of points is acceptable as long as it is used systematically.
ASTM E562-19e1 provides the "ground truth" for these measurements, ensuring that different labs and manufacturers can produce comparable, accurate data. 2. The Methodology: Systematic Manual Point Counting
The point count technique relies on simplicity, reproducibility, and statistical independence. Instead of tracing complex boundaries or attempting to compute areas manually, an operator overlays a transparent grid onto a microstructural image. The Grid Structure
covers automated image analysis, ASTM E562 remains vital because: Low Contrast astm e562-19e1
Standard grid configurations typically contain , formed by the intersection of orthogonal lines.
The magnification on the light optical microscope (LOM) or scanning electron microscope (SEM) should be chosen so that the microstructural features are clearly resolved. However, it should not be so high that only a fraction of a single phase particle fills the entire grid.
Adjust magnification so that grid intersections rarely fall on the same discrete particle. The analyst uses a point-counting grid, which is
High strength combined with ductility is achieved by controlling the volume fraction of hard martensite islands within a soft ferrite matrix.
Let's assume a metallurgist is measuring the volume fraction of delta ferrite in a cast austenitic stainless steel specimen using a across 3 fields of view (
Understanding ASTM E562-19e1: The Standard for Systematic Manual Point Count Phase Quantification The standard does not mandate a specific grid
If you need to implement this testing method for a specific material or quality control pipeline, let me know: What you are evaluating? What target phase or constituent you need to measure?
As the hours ticked by, the data accumulated. The standard provided the equations to calculate the standard deviation and the 95% confidence interval. It told him not just what the volume fraction was, but how much he could trust that number.
Pi=(Number of internal points)+0.5×(Number of boundary points)cap P sub i equals open paren Number of internal points close paren plus 0.5 cross open paren Number of boundary points close paren
