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US 7,603,786 B2Granted
Piezoelectric quartz level sensor
AssigneeBeijing Information Technology Institute
InventorsFuxue Zhang, Wei Zhang
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AssigneeBeijing Information Technology Institute
InventorsFuxue Zhang, Wei Zhang
Estimating the term…
The present invention relates to a new piezoelectric quartz level sensor mainly applied in the attitude stabilized and control system of the aircraft, robot, vehicle, ship, oil drilling platform, construction, industrial automation equipment, radar, and satellite, comprising a sensitive element, signal processing circuit, base, outer case and socket. The piezoelectric quartz level sensor transfers the deflection angle of the object to the force exerted on two symmetrical mounted round piezoelectric quartz wafers, and then utilizing the prominent force sensitivity of the piezoelectric quartz, the level attitude parameter of an objected can be detected through the frequency variation due to the force exerted on the two piezoelectric quartz wafers. Therefore, the present invention can satisfy the demand of high stability and resolution, low non-linear degree, quick start time, wide measuring range and operating temperature, good ability to resist shock, and digital output.
A piezoelectric quartz level sensor, comprising a sensitive element, a signal processing circuit, a bottom base frame, an outer case and a socket, wherein said sensitive element comprises two round piezoelectric quartz wafers symmetrically mounted on the two sides of the axial line of a column between a top plate and a bottom plate, an overload protective unit on the axial, transverse, and vertical directions of the piezoelectric quartz wafers, wherein said axial overload protect unit comprises a sensitive block, a shock pad between said bottom plate and a pallet, and an adjustable axial retaining bolt on a mass column of the sensitive block, and said transverse and vertical overload protective unit comprises an overload protective frame, and four adjustable retaining bolts provided on said overload protective frame around said mass column, wherein said sensitive element further comprises a sealed cavity cover and a base that is fastened to said sealed cover.
Dependencies are inferred from the claim text.