calcPowderSensCoeff function

double? calcPowderSensCoeff(double v0Mps, double t0C, double v1Mps, double t1C,)

Calculates powder sensitivity coefficient (fractional velocity change per 15°C)/// from two raw measurement pairs without requiring an Ammo object. from two raw measurement pairs without requiring an Ammo object.

• v0Mps / t0C — reference muzzle velocity and powder temperature
• v1Mps / t1C — secondary measured velocity and temperature

Returns null when the pair is degenerate:

• either velocity is non-positive
• velocities are equal (no Δv)
• temperatures are equal (no Δt)

Implementation

double? calcPowderSensCoeff(
  double v0Mps,
  double t0C,
  double v1Mps,
  double t1C,
) {
  if (v0Mps <= 0 || v1Mps <= 0) return null;
  final double vDelta = (v0Mps - v1Mps).abs();
  final double tDelta = (t0C - t1C).abs();
  if (vDelta == 0 || tDelta == 0) return null;
  final double vLower = v1Mps < v0Mps ? v1Mps : v0Mps;
  return (vDelta / tDelta) * (15.0 / vLower);
}