Absolute air refractive index measurement and tracking based on variable length vacuum cell

Yu, Xin; Zhang, Tieli; Ellis, Jonathan D.

doi:10.1117/1.oe.55.6.064112

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Yu et al developed a refractometer for the absolute RIA measurement and relative RIA tracking by adopting four modified Wu-type heterodyne interferometers and a variable length vacuum cell. The standard deviation of the measurement discrepancy of RIA between the proposed method and the Edlén equations is 2.8 parts in 10 7 [18]. Schödel et al realized RIA measurement under a low-pressure regime by imaging interferometry using PTB's ultra-precision interferometer and one vacuum cell, and an agreement of 10 −9 was achieved by comparing the measured values with the ones obtained from Bönsch's formula [19].…”

Section: Introductionmentioning

confidence: 90%

“…In order to solve this problem, the second kind adopts one or more permanent evacuated chambers [16][17][18][19][20]. Based on laser heterodyne interferometry, Huang et al realized the measurement range of 3.1 × 10 −4 and the uncertainty of 2.3 × 10 −8 by synthesizing a set of synthetic pseudo-wavelengths with three specific length vacuum cells [16].…”

Section: Introductionmentioning

confidence: 99%

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Precision measurement of the refractive index of air using a phase modulated homodyne interferometer with a variable length vacuum cavity

Chen

Yan

et al. 2019

Meas. Sci. Technol.

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Precision measurement of the refractive index of air (RIA) using a phase modulated homodyne interferometer with a variable length vacuum cavity is proposed. In this method, to realize precise measurement of RIA, the vacuum cavity is pushed to generate a continuous optical path change between air and vacuum, and the resulting phase change of the interferometer is demodulated with an ellipse-fitting PGC-Arctan algorithm. In order to demodulate the interference phase accurately, a hybrid phase modulation is realized by applying a sinusoidal modulation to an electro optical modulator and a triangular modulation to a piezoelectric transducer. The feature of this individual modulation is that it can guarantee sufficient data for elliptical fitting without sacrificing the modulation depth. The significant advantage of the proposed method is that it can correctly count the integral fringes during the vacuum cavity pushing even with vibrating and air fluctuation as well as precisely demodulate the phase before and after the pushing by calibrating the ellipse parameters in real time. The measurement principle and phase demodulation are described in detail. The static signal processing experiment was carried out to evaluate the accuracy of the phase demodulation scheme. Two RIA measurement experiments were performed, and the results are compared with those obtained with Edlén equations to validate the feasibility and effectiveness of the proposed method. Experimental results show that the standard deviation of RIA is better than 2.6 × 10 −8 in 20 min and 4.6 × 10 −8 in 8.5 h.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Precision measurement of the refractive index of air using a phase modulated homodyne interferometer with a variable length vacuum cavity

Chen

Yan

et al. 2019

Meas. Sci. Technol.

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Investigation of optical force on magnetic nanoparticles with magnetic-fluid-filled Fabry-Perot interferometer

Yao

Rao

et al. 2018

Sci Rep

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The optical force acting on the magnetic nanoparticles (MNPs) is investigated with the magnetic-fluid-filled fiber-optic Fabry-Perot interferometer. The shift of interference spectra is related with the local refractive index variation in the light path, which is assigned to the optical-force-induced outward movement of MNPs. The influence of magnetic fluid’s viscosity, ambient temperature, strength and orientation of the externally applied magnetic field on the optical-force-induced MNPs’ movement is studied in details. The results of this work provide a further understanding of interaction between light and MNPs and clarify the dynamic micro-processes of MNPs within magnetic fluid under external stimuli. It may have the potentials in the fields of light-controllable magnetic-fluid-based devices and vector magnetic field detection.

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Research progress and application of air refractive index measurement technology based on laser interference

Zhang¹,

Liu²,

Jin³

et al. 2021

International Conference on Optics and Image Processing (ICOIP 2021)

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Absolute air refractive index measurement and tracking based on variable length vacuum cell

Cited by 3 publications

References 17 publications

Precision measurement of the refractive index of air using a phase modulated homodyne interferometer with a variable length vacuum cavity

Precision measurement of the refractive index of air using a phase modulated homodyne interferometer with a variable length vacuum cavity

Investigation of optical force on magnetic nanoparticles with magnetic-fluid-filled Fabry-Perot interferometer

Research progress and application of air refractive index measurement technology based on laser interference

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