spectrometer op• Data kinds: table → table
• Call: import fullseye as fs; fs.ledger.spectrometer_bandpass(design, slit_width_um=25.0, pixel_um=14.0, input_na=0.1, wavelengths_nm=None, slit_height_mm=1.0, pupil='circular') (to call the implementation directly, import gratingspec; gratingspec.spectrometer_bandpass(design, slit_width_um=25.0, pixel_um=14.0, input_na=0.1, wavelengths_nm=None, slit_height_mm=1.0, pupil='circular'); from the registry, opsoptics.get("spectrometer_bandpass"))
Spectrometer bandpass (FWHM of the instrument line shape) per wavelength, from the slit, the pixels and diffraction.
> The detailed description below is the original text — the summary and the headings are translated.
design: czerny_turner_design の表。
slit_width_um: 入口スリットの幅 w。0 は理想の点(回折と画素だけが残る)。
pixel_um: 検出器の画素の幅(分散方向)。0 は理想の連続の検出器。
input_na: スリットに入る光の NA(コリメータで平行になったビームの直径 D = 2 f_col tan(asin NA) を決め、
照らされた溝の数 N = D / (d cos α) と回折の線幅を決める)。
wavelengths_nm: 評価する波長(None なら帯域の 5 点)。
slit_height_mm: スリットの高さ(エタンデュだけに効く)。
pupil: "circular"(円いビーム、既定)/ "rectangular"(一様に照らした矩形 = 教科書の mN)。
返り値(table、波長ごとの配列):
• slit_image_um —— w' = w (f_cam / f_col)(cos α / cos β)(Palmer (8-11a)、焦点面の上、収差なし)。
• reciprocal_dispersion_nm_per_mm —— P = d cos β / (|m| f_cam)(焦点面の上)。
• slit_image_flat_um / reciprocal_dispersion_flat_nm_per_mm / obliquity_factor —— カメラの軸に垂直な平らな検出器の上(局所の倍率 1 / cos²(β − β_c)、czerny_turner_design の写像 x = f tan(β − β_c) と同じ)。装置関数と FWHM はこちらで作る。積 w' P(スリットで決まる帯域)はどちらでも同じ。
• slit_limited_nm (= w d cos α / (|m| f_col)、β に依らない) / pixel_limited_nm (= p P) / palmer_bandpass_nm (= P sup(w', p)、Palmer (8-12)) / diffraction_fwhm_nm(回折だけの FWHM)/ rayleigh_limit_nm (= λ / (|m| N))。
• fwhm_um / fwhm_nm —— 装置関数(回折 ⊗ スリットの像 ⊗ 画素)の FWHM。
• resolving_power (= λ / FWHM) / grating_resolving_power (= |m| N) / pixels_per_fwhm。
• regime —— 最も幅の大きい寄与("slit" / "pixel" / "diffraction")。
• line_shapes —— 波長ごとの装置関数 pairs(Δλ [nm], 最大 1 に正規化)。
• etendue_mm2sr —— スリットの面積 × π NA²(スループットはこれに比例する。w と分解能の取引)。
Raises ValueError: 設計の表でない、帯域の外の波長、NA が (0, 0.95] の外、幅が負、瞳の名前の誤り。
Every optics op validates its input before computing (nothing slips through silently):
• Units are baked into the argument name — _mm / _um / _deg / _mrad. Confusing mm with µm does not crash; it yields a plausible-looking wrong answer, so the name prevents it. Nothing here guesses the unit from the magnitude.
• Strings raise ValueError — float('50') succeeds, so an unparsed configuration value would slip through as a length (measured: thin_lens('50', '200') returned a plausible 66.667 mm). bool is refused too, as the implicit promotion True == 1.
• complex / masked arrays raise ValueError (real-valued slots only; silently dropping the imaginary part or peeling off the mask is refused). NaN/Inf raises ValueError on every input.
• Division by zero and its relatives are refused by name: focal length 0, radius of curvature 0, refractive index <= 0, a fully opaque aperture (all zeros, so the normalisation is 0/0), a PSF whose sum is <= 0, a Stokes vector with S0 = 0, and an object sitting at the front focal point (the image is at infinity).
• Only two ops return a non-finite value, and both state it as a contract: depth_of_field returns far_mm = inf beyond the hyperfocal distance (that is what the hyperfocal distance means), and gaussian_beam returns wavefront_radius_mm = inf at the waist (the radius of curvature of a plane wavefront). Both also return a finite companion (far_is_infinite / curvature_per_mm). Any other silent NaN/Inf is detected internally and raises ValueError — "float64 overflowed" and "the answer is infinite" are different claims, so the first is never returned wearing the face of the second.
• Size caps: generated grids are capped by optics.MAX_GRID (4096); supplied fields/PSFs/apertures by optics.MAX_FIELD_ELEMENTS (2^24); ABCD element chains by optics.MAX_SYSTEM_ELEMENTS (1024); Zernike by MAX_ZERNIKE_TERMS (512) / MAX_ZERNIKE_ORDER (40) / MAX_ZERNIKE_BASIS (2^25). This closes, fail-closed, the paths where a small argument triggers a huge internal allocation (measured: n_max=40 × 4096² needs 108 GB).
• Physically impossible states are refused too: a Stokes vector with degree of polarisation > 1, negative transmittance, negative intensity, and invalid Zernike indices such as n-|m| odd.
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
• poc_spectrometer_illumination — py -3.11 examples/poc_spectrometer_illumination.py
table as input)abcd_matrix · wavefront_stats · sfr_from_edge · paraxial_trace · seidel_coefficients · spot_stats · tolerance_analysis · wavefront_from_opd
spectrometer)grating_dispersion · czerny_turner_design · spectrometer_slit_image · spectrometer_spectrum
*Provenance: gratingspec.py — OPTICS operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.