THz 計算ツール
Five analysis tools and four conversions that come up in every terahertz experiment. Everything runs in your browser; nothing is sent anywhere.
膜厚解析
時間領域スキャンをドロップすると、試料の膜厚と屈折率が得られます。内部エコーが分離できる場合は両者を同時に解くため、屈折率の仮定も校正試料も不要です。ブラウザ内で動作し、データはどこにも送信されません。
ツールを開く →塗膜厚さ解析
1 回の反射スキャンから自動車塗装の各層を求めます — クリア、ベース、プライマー、電着。エコーはパルス内で重なるため、波形全体を一度に当てはめます。どの層が実在するかも判定します。
ツールを開く →Terahertz transmission
A reference scan and a sample scan in, transmission out. Both transformed, the spectra drawn against the noise floor so you can see where the data ends, and refractive index and absorption from a thickness. Linear, per cent, log or dB.
ツールを開く →Organic crystal phase matching
What thickness of DAST, DSTMS, OH1 or BNA gives the most terahertz, and where the band ends. Coherence length, the phonon, and output against thickness, from indices you can replace with your own measurements.
ツールを開く →EO 検出帯域幅
GaP や ZnTe の電気光学検出器が実際に得られる帯域幅。結晶、厚み、プローブ波長、パルス幅を選ぶと、速度不整合とフォノンがどこで帯域を制限するかが曲線に現れます。
ツールを開く →スペクトル単位換算
TDS スキャン範囲 ↔ 分解能
周波数分解能は時間波形の長さで決まります：Δf = 1/T。
PCA Scanner: 標準 600 ps / < 2 GHz、オプション 3 ns / < 0.5 GHz。
回折限界スポット
d = 1.22 λ f / D.
RIGI 視野
対物レンズ前の焦点面アレイの有効面積。
アプリケーションノート
What these tools are doing, and where each method quietly gives a wrong answer.
Refractive index and absorption from a THz-TDS measurement
How the standard thick-slab extraction works, what it assumes, and the four places it quietly gives you a wrong answer: etalons, phase unwrapping.
Read it →Choosing an electro-optic crystal for a target bandwidth
GaP, ZnTe, GaSe and BBO compared honestly. Why velocity mismatch, not material quality, sets your detection bandwidth.
Read it →Organic crystal thickness: why thicker stops helping
DAST, DSTMS, OH1 and BNA. Coherence length, terahertz absorption and pump absorption each cap the useful thickness.
Read it →Dynamic range, and where your data stops being data
Bandwidth claims mean nothing without a dynamic range to go with them. How to measure the noise floor honestly.
Read it →Water vapour lines and what they do to a transmission spectrum
Why atmospheric absorption lines throw spikes into a transmission ratio, why purging is the real fix.
Read it →