Liu Threshold Analyzer 1.0.2

Download LiuAnalyzer.exe below: one file, no installer, for Windows 10 (1809 or later) and Windows 11.

Added

• An application icon: a U, for the third letter of Liu and for the
  cross-section of the crater a pulse leaves. tools/make_icon.py draws it, so
  it can be changed with a diff rather than replaced as a binary.

Liu Threshold Analyzer 1.0.1

Download LiuAnalyzer.exe below: one file, no installer, for Windows 10 (1809 or later) and Windows 11.

Added

• Open. A saved JSON session can now be read back into the window from the
  footer, which is what the Save option had been promising. A file that is not
  a session, or holds a non-positive measurement, is refused with a message
  rather than half-loaded.

Changed

• The energy axis starts logarithmic. That is the view in which Liu's
  method is a straight line and the one every screenshot shows; a new user no
  longer has to find Settings to see it.

Fixed

• The threshold uncertainty now uses the whole covariance of the fit. The
  slope and intercept of a least-squares line are correlated, and the earlier
  propagation treated them as independent, although the documentation said
  otherwise. A test checks the result against an independent computation of
  the covariance matrix.

Liu Threshold Analyzer 1.0.0

Download LiuAnalyzer.exe below: one file, no installer, for Windows 10 (1809 or later) and Windows 11.

First public release. The tool has been in use since May 2026; this is the point
at which somebody else could pick it up.

Added

• Liu's method, end to end. Enter (pulse energy, crater diameter) pairs and
  read the ablation threshold fluence and the Gaussian beam waist, each with a
  1σ uncertainty propagated from the regression covariance, plus the R² of the
  fit.
• Error bars from repeats. Measurements sharing a pulse energy are grouped
  automatically and drawn with their sample standard deviation.
• A chart that makes the method obvious, with a switchable logarithmic or
  linear energy axis. On the logarithmic axis the fit is a straight line, which
  is the whole point of the technique.
• Five languages: English, Chinese, Spanish, French and Russian, switchable
  from the header. English is the default.
• Light and dark themes, switchable from Settings.
• Save as a JSON session that reopens, or as a PNG of the chart with the
  data table drawn underneath it.
• An Instructions dialog deriving every quantity from the fitted slope and
  intercept, with the error-propagation expression for each, and a diagram of
  the beam geometry.
• A one-file portable executable. No installer and no Python on the target
  machine. build.bat builds it locally; pushing a version tag builds it on a
  clean Windows runner and attaches it to a GitHub release.
• Demo data on first launch — six greyed-out points, dismissed by the first
  real measurement, so that the window is never blank and never ambiguous about
  whether the data is yours.

Fixed

• The Gaussian-beam diagram is now credited. It is adapted from a Wikimedia
  Commons figure under CC BY-SA 3.0, which requires attribution; the credit
  appears in the About dialog, so it travels inside the executable, and in
  NOTICE.
• Lint findings across the codebase: modern X | None annotations, imports from
  collections.abc, and sorted imports. Qt's model API requires a call in a
  default argument, so B008 is ignored for data_table.py with a note saying
  why rather than being worked around.