spad op• データ種: countrate → countrate
• 呼び出し: import fullseye as fs; fs.ledger.spad_deadtime_correct(measured_hz, dead_time_ns=50.0) (実装を直接呼ぶなら import photoncount; photoncount.spad_deadtime_correct(measured_hz, dead_time_ns=50.0)、台帳から引くなら opsphoton.get("spad_deadtime_correct"))
Recover the true photon rate from a dead-time-distorted measured rate.
The exact inverse of the non-paralysable law of spad_deadtime_apply::
n = m / (1 - m*tau)
A round trip apply -> correct is exact to machine precision (measured max elementwise relative error 6.0e-16 over 2000 rates spanning 1e3 to 5e7 Hz at tau = 50 ns, where the measured rate reaches 71.4% of the 20 MHz saturation rate).
There is deliberately no paralysable inverse. m = n*exp(-n*tau) is not injective — every measured rate below the maximum 1/(e*tau) corresponds to *two* true rates, one below and one above 1/tau — so returning one of them would be a fabrication dressed as a correction. Resolve the branch with an independent measurement (e.g. an attenuator step) and invert it yourself.
*measured_hz* is a 1-D array of measured rates in counts per second; *dead_time_ns* the dead time in nanoseconds (default 50, the same
placeholder spad_deadtime_apply uses — replace it with the datasheet value). Returns the corrected true rates as a float64 1-D array.
Raises ValueError: negative, non-finite or non-1-D *measured_hz*, a non-positive *dead_time_ns*, and — instead of returning inf or a negative rate — any measured rate at or above the saturation rate 1/tau, which no non-paralysable detector can ever produce.
• photon_timeresolved ファミリ ガイド
• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。
• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。
• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。
• photon_timeresolved — py -3.11 examples/photon_timeresolved.py
countrate を入力に取れる)spad)spad_deadtime_apply · tcspc_coates_correct
*Provenance: photoncount.py — PHOTON operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.