Biaxial inclination sensor

G - Physics – 01 – C

Patent

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Details

G01C 9/06 (2006.01) G01C 9/18 (2006.01) G01C 9/20 (2006.01) G01C 9/24 (2006.01) G01C 9/28 (2006.01) G01C 9/36 (2006.01)

Patent

CA 2169213

A biaxial inclination sensor including, in the inner bottom of a circular liquid chamber (11) formed in a sensor holder (1) made of an insulating material and having a bottom surface (28) made horizontal, one common electrode (2) made of 18K gold having a low ionization tendency in a central position and vertical with respect to the bottom surface (28) and four outer electrodes (3) made of the same material as the common electrode (2) and passing vertically through the bottom surface (28) at points of intersection of two horizontal orthogonal lines passing through the center and a circle of a predetermined radius about the center and all having the same surface area. An opening in the liquid chamber (11) of the sensor holder (1) is closed off in a liquidproof manner by a glass window plate (4) having a spherical concave portion (9) of a surface roughness less than JIS Rmax 0.25 in its inner surface. A gas bubble (8) and an electrolyte (7) made by mixing pure water as a solvent, magnesium sulfate as a solute and anhydrous methanol as a solution in such ratios that the impedance between the electrodes is 10K .OMEGA.. are sealed into the sealed liquid chamber (11) in amounts such that the common electrode (2) is always submerged in the electrolyte and does not make contact with the gas bubble (8). The biaxial inclination sensor has a high resolution and reproducibility and stability of detection with which it is possible to secure a high level indication of inclination angle zero by attitude control.

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