论文信息 - Dual axis tiltmeter with nanorad resolution based on commercial force compensation weigh cells

Dual axis tiltmeter with nanorad resolution based on commercial force compensation weigh cells

High precision measurements and monitoring of tilt or inclination are not only essential in the field of geophysics and geodesy but also in ultraprecise force and mass measurements. We present a new concept for high resolving tilt/ inclination measurements. Thereto a commercial electromagnetic force compensation (EMFC) weigh cell is mounted in a hanging position and loaded with a defined weight. Thus the system conforms to a pendulum. By measuring the tilt depended deflection of the pendulum with the position sensor of the weigh cell we achieved a measuring rage of ± 2 mrad. By operating the pendulum like a hanging balance and compensating the pendulum deflection with the balance internal voice coil a tilt dependent lateral force is measured. In this case the measurement range of the Tiltmeter was extended to ± 9 mrad. In both measurement modes a standard deviation of < 10 nrad (1.5 nrad filtered) within a period of 30 minutes was achieved. Index Terms tiltmeter, inclinometer, electromagnetic force compensation

[1] Paul Melchior,et al. Earth Tides , 1952, Nature.

[2] Haruo Sato,et al. Borehole-type tiltmeter and three-component strainmeter for earthquake prediction , 1986 .

[3] Duncan Carr Agnew,et al. Strainmeters and tiltmeters , 1986 .

[4] Randall D. Peters,et al. Mechanically adjustable balance and sensitive tilt meter , 1990 .

[5] Hideo Hanada. GROUND VIBRATIONS AND TILTS , 1998 .

[6] Jon R. Pratt,et al. A Flexure Balance With Adjustable Restoring Torque for Nanonewton Force Measurement | NIST , 2002 .

[7] V. Nesterov,et al. Facility and methods for the measurement of micro and nano forces in the range below 10?5 N with a resolution of 10?12 N (development concept) , 2007 .

[8] Uwe Brand,et al. A new facility to realize a nanonewton force standard based on electrostatic methods , 2009 .

[9] V. Nesterov,et al. A nanonewton force facility and a novel method for measurements of the air and vacuum permittivity at zero frequencies , 2009 .

[10] Falko Hilbrunner,et al. HIGH PRECISSION OPTICAL POSITION SENSOR FOR ELECTROMAGNETIC FORCE COMPENSATED BALANCES , 2010 .

[11] André rer. nat. Gebauer. The impact of topographic and geological features on deformations of the upper crust , 2010 .

[12] Falko Hilbrunner,et al. Force measurement of low forces in combination with high dead loads by the use of electromagnetic force compensation , 2012 .