Combined coding type vortex lattice absolute position sensor

Abstract

The invention relates to a combined coding type vortex lattice absolute position sensor, which belongs to the technical field of measuring instruments. The combined coding type vortex lattice absolute position sensor comprises a fixed lattice, a movable lattice and a control mechanism, wherein the movable lattice is movably arranged on the fixed lattice and is connected with the control mechanism for outputting sensing signals, the fixed lattice comprises a measuring code passage and a positioning code passage which are mutually parallel, the movable lattice comprises two movable lattice code passages corresponding to the measuring code passage and the positioning code passage, a plurality of independent metal positioning conductors are arranged on the positioning code passage, the average value of the spaces between two metal positioning conductors is the same as the wavelength of the positioning code passage, and the space between any two adjacent metal positioning conductors conforms to the combined coding rule. The invention carries out the improvement by aiming at the disadvantages and the defects of the vortex lattice in the prior art, is applicable to various waterproof electronic measuring devices, can lower the requirement of the existing vortex lattice sensor on the technology, and can further improve the measuring precision.

Description

technical field [0001] The invention relates to a device in the technical field of measuring instruments, in particular to a combined coded eddy current grid absolute position sensor. Background technique [0002] Various measuring tools used in the existing manufacturing sites are generally developing in the direction of digitalization, large range, absolute code, etc., and the requirements for waterproof, dustproof, shockproof, and antimagnetic are getting higher and higher. At present, the large-range displacement sensors with waterproof function launched around the world can be summarized into the following four types: [0003] The first is a displacement sensor based on the principle of a differential transformer. This type of sensor uses the eddy current effect to form a differential transformer type displacement sensor. It consists of a pair of transmitting coils and receiving coils. It realizes large-scale displacement measurement through mutual inductance changes, a...

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Problems solved by technology

The disadvantage is that the sensor coil part is relatively large, which is not conducive to further miniaturization

[0004] The second type is a displacement sensor based on the principle of variable reluctance. This type of sensor uses the magnetoresistance effect to form a magnetoresistive displacement sensor. It is small in size, can realize large-scale displacement measurement, and has a waterproof function, but the influence of magnetic particulate matter cannot be ruled out. , and the displacement sensor output signal of this principle is incremental

However, due to manufacturing errors and installation accuracy, these types of sensors are still prone to large numbers of errors, that is, the disadvantages of low absolute positioning accuracy and poor reliability

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