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A kind of air refractive index measurement device and measurement method based on dispersion interferometry

A technology of measuring device and measuring method, which is applied in the field of refractive index measurement, and achieves the effects of short measurement period, simple device and good stability

Inactive Publication Date: 2017-03-29
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the test requires a rough measurement and requires a light source with a wider spectral line, so the multi-wavelength measurement method measures the average refractive index of various wavelengths

Method used

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  • A kind of air refractive index measurement device and measurement method based on dispersion interferometry
  • A kind of air refractive index measurement device and measurement method based on dispersion interferometry
  • A kind of air refractive index measurement device and measurement method based on dispersion interferometry

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Embodiment Construction

[0035] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0036] The device structure of the present invention is as figure 1As shown, the device includes a repetition rate-locked optical frequency comb 1 as a light source, a collimator 2 arranged at the light output end of the repetition rate-locked optical frequency comb 1, and a first plane reflector 3 that makes the incident light incident at an angle of 45° , the reflected light of the first plane reflector 3 is incident on the flat beam splitter 4 with a split ratio of 50:50 at an angle of 45°, and placed on the vacuum tube 5 at the rear end of the flat split mirror 4 with a split ratio of 50:50, so The length of the vacuum tube 5 is fixed, its interior is evacuated during manufacture, its exterior is connected to the air, two fused silica windows are glued at both ends to allow light to pass through, and the diameter of the window ensures a flat...

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Abstract

The invention provides a device for measuring the air refractivity based on a dispersion interference method and a measuring method of the device. The device comprises an optical frequency comb with locked repetition frequency, a slab beam splitter with a splitting ratio of 50:50, a vacuum tube with a certain length, a hollow pyramid subjected to surface gold plating, and a spectrum analyzer used for recording an interference spectrum, wherein the optical frequency comb with locked repetition frequency has multiple stable-frequency longitudinal molds and is capable of acquiring the dispersion characteristics of the air refractivity; the vacuum tube is internally vacuumized and is externally communicated with air, so that relative measurement for the air refractivity can be realized under a condition of avoiding air extraction and air inflation, and relatively high measurement uncertainty can be obtained. The invention further discloses the measuring method of the device. The measuring device has the advantages of simple device, short measurement period, good stability and the like, and can be used for correcting the air refractivity in real time during precise length measurement.

Description

technical field [0001] The invention belongs to the technical field of refractive index measurement, and in particular relates to an air refractive index measurement device and measurement method based on a dispersion interferometry using a femtosecond optical frequency comb as a light source. Background technique [0002] Gas refractive index is an important parameter in the fields of interferometry, optical design, etc. The influence of the air refractive index should be considered in the design and data processing of instruments working in the air environment. In general, the refractive index of air is about 1.00027, and the range of variation is 10 -6 , so the refractive index of air is generally approximated to 1. However, in high-precision measurement or design, the error introduced by this approximation cannot be ignored. Therefore, the air refractive index value needs to be accurate to one ten-thousandth digit, one hundred thousandth digit, or even higher precision...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/45
Inventor 杨丽君张弘元李岩尉昊赟
Owner TSINGHUA UNIV
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