A method and device for measuring the refractive index of gas

A gas refractive index and gas measurement technology, which is applied in the field of optical measurement, can solve the problems of complex operation process and inaccurate measurement results, and achieve the effect of stable system and adjustable measurement sensitivity

Active Publication Date: 2020-06-19
HUNAN UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

These measurement methods or results are not accurate enough, or the operation process is complicated

Method used

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  • A method and device for measuring the refractive index of gas
  • A method and device for measuring the refractive index of gas
  • A method and device for measuring the refractive index of gas

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0023] The embodiment of the present invention proposes a measurement of the refractive index of gas by using an optical frequency comb. This method converts the refractive index information into a microwave signal through phase conversion, and uses a mature microwave instrument to realize the measurement of the refractive index of the gas to be measured. Compared with optical measurement methods, it has the characteristics of adjustable measurement sensitivity and stable system.

[0024] In this example, if figure 1 As shown, the gas refractive index measurement device includes an optical frequency comb generation module, a gas measurement cell 108 , a first photodetector 109 , a second photodetector 201 , a radio frequency switch 202 , a spectrum analyzer 203 , and a signal acquisition and processing module 204 . The optical frequency comb generating mo...

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Abstract

The invention discloses a method and a device for measuring the refractive index of gas. The method comprises the following steps: inflating gas to be measured into a gas measuring pool; enabling a light frequency comb to enter a first photoelectric detector after going through the gas measuring pool; measuring an electrical signal output by the first photoelectric detector by the frequency spectrograph and collecting the measuring result of a frequency spectrograph; and calculating the refractive index of gas to be measured, wherein the formula of refractive index is as shown in the specification, c is velocity of light, delta f is the frequency space between every two adjacent wave crests or wave hollows of the electric signal obtained by the frequency spectrograph, and d is the length of light in the gas measuring pool passing through the gas to be measured. The measurement of the refractive index of gas is realized by using the light frequency comb, the information of refractive index is converted onto a microwave signal through a phase position, the measurement of the refractive index of gas to be measured is realized by adopting a mature microwave instrument, and compared with optical measurement means, the method has the characteristics of measurement sensitivity adjustability, system stability and the like.

Description

technical field [0001] The invention relates to the field of optical measurement, in particular to a method and device for measuring the refractive index of gas. Background technique [0002] Refractive index is a basic physical quantity that characterizes the optical properties of substances, and this parameter is an important condition for determining the synthesis, manufacture and application of substances in various fields. [0003] At present, the measurement methods of gas refractive index include optical interference method, surface plasmon resonance method, optical fiber sensing method and critical angle method. These measurement methods or results are not accurate enough, or the operation process is complicated. [0004] Therefore, there is a need for a gas refractive index measurement method and device with accurate measurement results and simple operation. Contents of the invention [0005] The invention provides a gas refractive index measurement method and d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N22/00
CPCG01N22/00
Inventor 彭亮李慧霖陈信伟程旭升
Owner HUNAN UNIV OF SCI & TECH
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