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Statements

Subject Item
dbr:Cavity_ring-down_spectroscopy
rdf:type
yago:WikicatLaserApplications yago:Abstraction100002137 yago:Application106570110 yago:WrittenCommunication106349220 yago:CodingSystem106353757 yago:Communication100033020 yago:Program106568978 yago:Software106566077 yago:Writing106359877 yago:Code106355894
rdfs:label
Spectroscopie à cavité optique 光腔衰荡光谱 Cavity ring-down spectroscopy Cavity-ring-down-Spektroskopie
rdfs:comment
La spectroscopie à cavité optique (en anglais, cavity ring-down spectroscopy, CRDS) est un type de spectroscopie laser où l'échantillon est placé à l'intérieur d'une cavité hautement réfléchissante au laser et un effet induit par l'absorption de la lumière laser est détecté. Le temps de décroissance de la lumière sortant de la cavité est déterminé en fonction de la longueur d'onde laser pulsée. Die Cavity-Ring-Down-Spektroskopie (CRDS) ist eine Spektroskopie-Methode mittels optischer Resonatoren. Üblicherweise wird nur der englische Begriff benutzt, er lässt sich übersetzen mit Hohlraum- oder Resonatorabklingzeitspektroskopie. Ein alternativer Name ist Cavity Ring-down Laser Absorption Spectroscopy (CRLAS). Wie dieser Alternativname nahelegt, wird für diese Methode der Spektroskopie üblicherweise Laserlicht verwendet. Cavity ring-down spectroscopy (CRDS) is a highly sensitive optical spectroscopic technique that enables measurement of absolute optical extinction by samples that scatter and absorb light. It has been widely used to study gaseous samples which absorb light at specific wavelengths, and in turn to determine mole fractions down to the parts per trillion level. The technique is also known as cavity ring-down laser absorption spectroscopy (CRLAS). 光腔衰荡光谱（Cavity ring-down spectroscopy，CRDS）（也称腔振铃吸收光谱，共振腔环路衰减光谱）是一种非常灵敏的光谱学方法。它可用来探测样品的绝对的光学消光，包括光的散射和吸收。它已经被广泛地应用于探测气态样品在特定波长的吸收，并可以在万亿分率的水平上确定样品的摩尔分数。这种方法也被称作激光光腔衰荡吸收光谱（Cavity ring-down laser absorption spectroscopy, CRLAS）。 一台典型的光腔衰荡光谱装置包含了一个用于照亮高精细度光学谐振腔的激光光源，和构成谐振腔的两面高反射率反射镜。当激光和谐振腔的模式共振时，腔内光强会因相长干涉迅速增强。之后激光被迅速切断，以探测从腔中逸出光强的指数衰减。在衰减中，光在反射镜间被来回反射了成千上万次，由此带来了几到几十公里的有效吸收光程。 如果吸光物质被放置在谐振腔内，则腔内光子的平均寿命会因被吸收而减少。一套光强衰荡光谱装置测量的是，光强衰减为之前强度的 1/e 所需要的时间，这个时间被称为“衰荡时间”可以被用来计算腔内吸光物质的浓度。
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dbo:abstract
Cavity ring-down spectroscopy (CRDS) is a highly sensitive optical spectroscopic technique that enables measurement of absolute optical extinction by samples that scatter and absorb light. It has been widely used to study gaseous samples which absorb light at specific wavelengths, and in turn to determine mole fractions down to the parts per trillion level. The technique is also known as cavity ring-down laser absorption spectroscopy (CRLAS). A typical CRDS setup consists of a laser that is used to illuminate a high-finesse optical cavity, which in its simplest form consists of two highly reflective mirrors. When the laser is in resonance with a cavity mode, intensity builds up in the cavity due to constructive interference. The laser is then turned off in order to allow the measurement of the exponentially decaying light intensity leaking from the cavity. During this decay, light is reflected back and forth thousands of times between the mirrors giving an effective path length for the extinction on the order of a few kilometers. If a light-absorbing material is now placed in the cavity, the mean lifetime decreases as fewer bounces through the medium are required before the light is fully absorbed, or absorbed to some fraction of its initial intensity. A CRDS setup measures how long it takes for the light to decay to 1/e of its initial intensity, and this "ringdown time" can be used to calculate the concentration of the absorbing substance in the gas mixture in the cavity. Die Cavity-Ring-Down-Spektroskopie (CRDS) ist eine Spektroskopie-Methode mittels optischer Resonatoren. Üblicherweise wird nur der englische Begriff benutzt, er lässt sich übersetzen mit Hohlraum- oder Resonatorabklingzeitspektroskopie. Ein alternativer Name ist Cavity Ring-down Laser Absorption Spectroscopy (CRLAS). Wie dieser Alternativname nahelegt, wird für diese Methode der Spektroskopie üblicherweise Laserlicht verwendet. La spectroscopie à cavité optique (en anglais, cavity ring-down spectroscopy, CRDS) est un type de spectroscopie laser où l'échantillon est placé à l'intérieur d'une cavité hautement réfléchissante au laser et un effet induit par l'absorption de la lumière laser est détecté. Le temps de décroissance de la lumière sortant de la cavité est déterminé en fonction de la longueur d'onde laser pulsée. 光腔衰荡光谱（Cavity ring-down spectroscopy，CRDS）（也称腔振铃吸收光谱，共振腔环路衰减光谱）是一种非常灵敏的光谱学方法。它可用来探测样品的绝对的光学消光，包括光的散射和吸收。它已经被广泛地应用于探测气态样品在特定波长的吸收，并可以在万亿分率的水平上确定样品的摩尔分数。这种方法也被称作激光光腔衰荡吸收光谱（Cavity ring-down laser absorption spectroscopy, CRLAS）。 一台典型的光腔衰荡光谱装置包含了一个用于照亮高精细度光学谐振腔的激光光源，和构成谐振腔的两面高反射率反射镜。当激光和谐振腔的模式共振时，腔内光强会因相长干涉迅速增强。之后激光被迅速切断，以探测从腔中逸出光强的指数衰减。在衰减中，光在反射镜间被来回反射了成千上万次，由此带来了几到几十公里的有效吸收光程。 如果吸光物质被放置在谐振腔内，则腔内光子的平均寿命会因被吸收而减少。一套光强衰荡光谱装置测量的是，光强衰减为之前强度的 1/e 所需要的时间，这个时间被称为“衰荡时间”可以被用来计算腔内吸光物质的浓度。
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