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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Earth and Space Sciences · 术语表

什么是 Interference colour, order, Michel-Lévy chart？

又称： interference colour · order (of an interference colour) · Michel-Lévy chart

Definition 8.12 University Earth and Space Sciences — Year 1 · 第 8 章 — Optical Mineralogy

The interference colour of an anisotropic grain is its colour between crossed polars in white light, at $45{}^{\circ}$ from extinction; it depends only on its retardation $\Delta$ . The colours repeat in bands of about $550\,\mathrm{nm}$ of retardation, each ending with a red-violet tint; each band is an order (first, second, third…). The Michel-Lévy chart shows the interference colours against the retardation, with the lines $\Delta = d\,\delta$ that relate the thickness of a section, the birefringence of a mineral and its colour.

A Michel-Lévy chart computed from first principles: for each retardation, the colour of white light (CIE standard illuminant D65) through crossed polars and a plate at 45 from extinction, from the CIE 1931 colour-matching functions (data © CIE, CC BY-SA 4.0) and the sRGB transform, normalised to the light passed by parallel polars. The black lines give = d\, for the birefringence of each mineral; the dashed line is the standard thickness of 30\, µ m. The red-violet tints that end the orders fall at 542, 1074 and 1605\, nm in this computation. — A Michel-Lévy chart computed from first principles: for each retardation, the colour of white light (CIE standard illuminant D65) through crossed polars and a plate at $45{}^{\circ}$ from extinction, from the CIE 1931 colour-matching functions (data © CIE, CC BY-SA 4.0) and the sRGB transform, normalised to the light passed by parallel polars. The black lines give $\Delta = d\,\delta$ for the birefringence of each mineral; the dashed line is the standard thickness of $30\,\text{µ}\mathrm{m}$ . The red-violet tints that end the orders fall at 542, 1074 and $1605\,\mathrm{nm}$ in this computation.

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