This paper presents coherence concepts including time coherence, spatial coherence and complex correlation function.

本文介绍光的相干性概念，其中包括空间相干性、时间相干性和复相干函数。

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In formation evaluation slowness-time coherence is used in conjunction with an array-sonic tool in which the full waveforms at each receiver have been recorded.

在地层评价中，时差相关技术用于阵列声波测井中，阵列声波测井仪的每一个接收器都记录全波列信号。

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Fiber grating is manufactured by application of phase mask means, which is of low requirement of time coherence and monochromaticity for light-source, simple craft and high rate of finished products.

运用相位掩模法刻蚀光纤光栅，该方法对光源的时间相干性和单色性要求较低，工艺简单，成品率高。

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Long-time observers see the Bonn meeting as a last chance to create a central authority that gives the country coherence without repression and modernises without trampling traditional ways of life.

ECONOMIST: Special report