Two-color terrameter

Huggett, G. R.

doi:10.1016/0040-1951(81)90044-5

Cited by 14 publications

(6 citation statements)

References 8 publications

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“…This concept was originally proposed in the 1960s (Earnshaw and Owens 1967) and refined by Abou-Zeid in 2008. In 1975, Hugget and Slater presented a first out-door capable electronic distance meter based on this principle, a predecessor of the renowned Terrameter (Huggest and Slater 1975;Huggett 1981). Critical for this measurement concept is a very accurate measurement of the optical path lengths.…”

Section: Environmental Sensing and Compensationmentioning

confidence: 99%

The European GeoMetre project: developing enhanced large-scale dimensional metrology for geodesy

et al. 2023

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We provide a survey on the joint European research project “GeoMetre”, which explores novel technologies and their inclusion to existing surveying strategies to improve the traceability of geodetic reference frames to the SI definition of the metre. This work includes the development of novel distance meters with a range of up to 5 km, the realisation of optical multilateration systems for large structure monitoring at an operation distance of 50 m and beyond, and a novel strategy for GNSS-based distance determination. Different methods for refractivity compensation, based on classical sensors, on dispersion, on spectroscopic thermometry, and on the speed of sound to reduce the meteorological uncertainties in precise distance measurements, are developed further and characterised. These systems are validated at and applied to the novel European standard baseline EURO5000 at the Pieniny Kippen Belt, Poland, which was completely refurbished and intensely studied in this project. We use our novel instruments for a reduced uncertainty of the scale in the surveillance networks solutions for local tie measurements at space-geodetic co-location stations. We also investigate novel approaches like close-range photogrammetry to reference point determination of space-geodetic telescopes. Finally, we also investigate the inclusion of the local gravity field to consider the deviations of the vertical in the data analysis and to reduce the uncertainty of coordinate transformations in this complex problem.

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Section: Environmental Sensing and Compensationmentioning

confidence: 99%

The European GeoMetre project: developing enhanced large-scale dimensional metrology for geodesy

et al. 2023

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“…Slater & Huggett (1976) included a microwave GEODETIC MONITORING OF AUSTRALIAN TECTONISM 413 wave-length with blue and red laser measurements to correct for the water-vapour density along the path, and reported a stability approaching 1 part in 10 7 for distances of up to 10 km. A two-wave instrument incorporating the principles of their 1976 prototype is now commercially available (Huggett, 1981). An attempt is also being made to develop an instrument capable of 5 parts in 10 8 accuracy over 50 km paths (Moody & Levine, 1979).…”

Section: Horizontal Controlmentioning

confidence: 99%

Geodetic monitoring of tectonic deformation in the Australian region

Stolz

Lambeck

1983

Journal of the Geological Society of Australia

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“…The first experimental demonstration of dual-wavelength compensation was presented over 50 years ago using a He–Ne laser at 632.8 nm and light at 368.1 nm filtered from a mercury arc lamp [ 9 ]. Based on the same principle, the commercial instrument Terrameter was later conceived using a He–Ne (633 nm) and a He–Cd (440 nm) laser [ 10 ]. However, limitations imposed by the technical challenges of the setup made this commercial realization impractical, and the necessary fractional stability (Δ f / f ) of the laser frequency ( f ) prevented the achievable accuracy from getting close to the accuracy level of the empirical equations.…”

Section: Introductionmentioning

confidence: 99%

High-precision intermode beating electro-optic distance measurement for mitigation of atmospheric delays

Ray

Salido-Monzú

2023

Journal of Applied Geodesy

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High-precision electro-optic distance measurement (EDM) is essential for deformation monitoring. Although sub-ppm instrumental accuracy is already feasible with state-of-the-art commercial technology, the practically attainable accuracy on distances over more than a few hundred meters is limited by uncertainties in estimating the integral refractive index along the propagation path, which often results in measurement errors of several ppm. This paper presents a new instrumental basis for high-accuracy multispectral EDM using an optical supercontinuum to enable dispersion-based inline refractivity compensation. Initial experiments performed on two spectrally filtered bands of 590 and 890 nm from the supercontinuum show measurement precision better than 0.05 mm over 50 m for an acquisition time of around 3 ms on the individual bands. This represents a comparable performance to our previously reported results on 5 cm by over a range of 3 orders of magnitude longer, which can still be improved by increasing the acquisition time. The preliminary results indicate a relative accuracy of about 0.1 mm at 50 m on each wavelength. Improvement is possible by calibration and by implementing a self-reference scheme that mitigates slow drifts caused by power-to-phase coupling. The results reported herein thus indicate that the presented approach can be further developed for achieving sub-ppm accuracy of refractivity compensated distance measurements on practically useful ranges and under outdoor conditions.

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Two-color terrameter

Cited by 14 publications

References 8 publications

The European GeoMetre project: developing enhanced large-scale dimensional metrology for geodesy

The European GeoMetre project: developing enhanced large-scale dimensional metrology for geodesy

Geodetic monitoring of tectonic deformation in the Australian region

High-precision intermode beating electro-optic distance measurement for mitigation of atmospheric delays

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