Precise outdoor distance measurement using a HeNe laser beat distance meter

Fujima, Ichiro; Seta, Katuo; Brown, N.; Ciddor, PhilipE.

doi:10.1016/0030-3992(94)90015-9

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In these ways the aforementioned problems were minimised and the standard deviations achieved over 80 m were ± 18 µm. Some other methods for the construction and calibration of base-lines using interferometric techniques are found in the literature [2][3][4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Development of a calibration system for electronic distance measuring instruments

Forde¹,

Howick²

2001

SPIE Proceedings

View full text Add to dashboard Cite

This paper describes the design of a facility to calibrate electronic distance measuring instruments (EDMs), as used in surveying (electronic theodolites) and large scale industrial measurement, over the range of 0 to 60 m. The combined uncertainty of the system at 60 m, estimated at the 95% confidence level, is expected to be 0.4 mm. The EDM is compared with a heterodyne laser measurement system in a back-to-back configuration. The trolley carrying the optics travels on aluminium rails. In order to improve the straightness of the path followed by the reflectors during measurement, the trolley optics are mounted on a two-axis motorised translation stage which uses a quadrant diode to track an additional guiding laser beam parallel to the required path. Once programmed, the trolley tracking electronics are autonomous and no connection is necessary to external power or control sources for that. However, radio frequency remote control of the motor propelling trolley motor would assist the measurements.

show abstract

Section: Introductionmentioning

confidence: 99%

Development of a calibration system for electronic distance measuring instruments

Forde¹,

Howick²

2001

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…A sinusoidal modulated beam can be obtained using three techniques: external modulation using an electrooptic modulator, 1 direct modulation of a laser diode or a lightemitting diode and the intermode beat of a laser. 2 The external modulation method using an optical waveguide modulator can be used to produce a sinusoidal modulated beam with a modulation frequency of up to 20 GHz. Therefore, the measurement resolution of a distance meter can be improved by using optical waveguide modulators.…”

Section: Introductionmentioning

confidence: 99%

High-resolution distance meter using optical modulators at 3.5 GHz

Fujima¹,

Seta²,

Matsumoto³

et al. 1997

Opt. Eng

Self Cite

View full text Add to dashboard Cite

A high-resolution distance meter is fabricated using optical waveguide modulators. The modulation frequencies of the optical modulators are around 3.5 GHz, while the modulation frequencies of the optical intensity are around 7 GHz because the modulation bias voltages are set at the peaks of the electrooptic characteristics. The distance meter was evaluated in the National Research Laboratory of Metrology (NRLM) tunnel, which is a semiunderground tunnel. The measurement resolution has a standard deviation of 12 m for a distance range of 0.5 to 5 m after correction of the cyclic error. © 1997 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(97)01012-X]

show abstract

“…Laser interferometers are not appropriate for the purposes mentioned above because they require a moving carriage in order to measure the distance between two points. A sinusoidal modulated beam can be obtained using three techniques: external modulation using an electro-optic (EO) modulator [1], direct modulation of a laser diode (LD) or a light-emitting diode and the intermode beat of a laser [2]. The external modulation method using an optical waveguide modulator can be used to produce a sinusoidal modulated beam with a modulation frequency of up to several tens of gigahertz.…”

Section: Introductionmentioning

confidence: 99%

High-resolution distance meter using optical intensity modulation at 28 GHz

Fujima¹,

Iwasaki²,

Seta³

1998

Meas. Sci. Technol.

View full text Add to dashboard Cite

A high-resolution distance meter was fabricated using optical waveguide modulators. An optical intensity modulation frequency of 28 GHz was utilized for the displacement measurement when the driving frequencies to the optical modulators were around 14 GHz. The distance meter was evaluated in the National Research Laboratory of Metrology (NRLM) tunnel, which is a semi-underground tunnel. The measurement resolution is 1 and 3 µm for a distance of 5 and 100 m, respectively, in one standard deviation after correction of the cyclic error. Furthermore, cyclic errors are examined for 28 GHz optical intensity modulation.

show abstract

Precise outdoor distance measurement using a HeNe laser beat distance meter

Cited by 3 publications

References 0 publications

Development of a calibration system for electronic distance measuring instruments

Development of a calibration system for electronic distance measuring instruments

High-resolution distance meter using optical modulators at 3.5 GHz

High-resolution distance meter using optical intensity modulation at 28 GHz

Contact Info

Product

Resources

About