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Transportable distance measurement system based on superheterodyne interferometry using two phase-locked frequency-doubled Nd:YAG lasers
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10.1063/1.3428729
/content/aip/journal/rsi/81/5/10.1063/1.3428729
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/5/10.1063/1.3428729
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Optical setup for two-wavelength superheterodyne interferometer using frequency-doubled Nd:YAG lasers emitting at . AOM, acousto-optic modulator; BS, beam splitter; CC, corner cube; IR, infrared output; M, mirror; PD, photodetector; PZT, piezoelectric ceramic; SW, synthetic wavelength.

Image of FIG. 2.
FIG. 2.

Superheterodyne detection system: AMPL, amplifier; PD, photodetector; RF, radio-frequency; LO, local oscillator; DAQ, data acquisition.

Image of FIG. 3.
FIG. 3.

Standard deviation of the first estimation of (experimental values) vs the frequency variation . 25 measurements have been performed for each value of , with a distance . Integration time of the phase measurements is 1 s. Lasers are phase-locked around 12 GHz . Fitting the curve with Eq. (23) gives , consistent with values given in Sec. IV A.

Image of FIG. 4.
FIG. 4.

Assessment of the system stability. The left (resp. right) vertical axis is the deviation from the mean measured phase (resp. distance) vs time. The phase was averaged over 1 s. The measurement was performed with a distance . Lasers were phase-locked at .

Image of FIG. 5.
FIG. 5.

Allan deviation of distance vs averaging time.

Image of FIG. 6.
FIG. 6.

Variation in the measured synthetic phase with synthetic frequency. Averaging time of the measured phase is 30 s. Uncertainties (phase deviation less than ) are not noticeable at this scale. The top graph represents the residuals of the measured phase from the linear fit.

Image of FIG. 7.
FIG. 7.

Variation in the measured as a function of the displacement measured with the reference system.

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/content/aip/journal/rsi/81/5/10.1063/1.3428729
2010-05-25
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Transportable distance measurement system based on superheterodyne interferometry using two phase-locked frequency-doubled Nd:YAG lasers
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/5/10.1063/1.3428729
10.1063/1.3428729
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