Automatic static calibration device of clearance-changed type current vortex sensor
A technology of eddy current sensors and calibration devices, which is applied in the direction of adopting electrical devices, measuring devices, instruments, etc., can solve the problems of low precision, long manual operation time, error-prone, etc., and achieve the effect of high precision and simple structure
Inactive Publication Date: 2012-10-31
BEIJING UNIV OF CHEM TECH
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Problems solved by technology
[0017] The disadvantage of manual calibration is that the manual operation of the displacement mechanism is slow, manual recording is time-consuming and labor-intensive, and it is also prone to errors
The whole calibration process is inefficient
The precision of the manual displacement mechanism is low. If the displacement precision is improved, the manual operation time will be longer and the efficiency will be lower.
Method used
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Embodiment 1
[0049] In this embodiment, automatic static calibration can be performed on two sensors of the same type at the same time; parameters of the two sensors can also be compared.
[0050] Attached below image 3 , with Figure 4 , with Figure 5 The present invention is described in further detail with the specific embodiment:
[0051] Select a diameter in the main static standard index table of the HZ-8500 series eddy current sensor as The probe, the eddy current sensor with a range of 10mm, the length of the spline groove of the worm gear is 14mm, and the length of the spline of the screw is 3mm, then the axial displacement of the screw relative to the frame should be 11mm. The stepping motor chooses 45C340C reactive stepping motor, its power supply voltage is DC12V, the current is 0.4A, the holding torque is 0.118Nm, and the step angle is 1.5 degrees. Because the stepper motor is different from other motors for control purposes, its biggest feature is that it accepts digit...
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The invention relates to an automatic static calibration device of a clearance-changed type current vortex sensor. for overcoming the deficit of the manual static calibration device, the automatic static calibration device of a clearance-changed type current vortex sensor, capable of making the calibration of the current vortex sensor automatize, improving the efficiency of the calibration of thecurrent vortex sensor, improving the accuracy of the calibration, storing the result of the static calibration to display in the chart or other form and print, is designed. the invention has the following main technical points: 1, a stepping motor is used for driving a worm wheel mechanism, a turbine drives a micro offset axis; 2, a set of micro- displacement driving mechanism drives a plurality of current vortex disk; 3, a single-chip is used for controlling the stepping motor, processing the outgoing signal of the current vortex preposing device, driving the signal device and processing a operating keyboard, storing the calibration data, controlling the automatic calibration process and the data transference between a communicating interface and an upper machine.
Description
technical field [0001] The invention relates to a device for calibrating a sensor, in particular to an automatic static calibrating device for a variable gap type eddy current sensor. Background technique [0002] Eddy current sensors refer to sensors made using the eddy current effect. According to Faraday's law of electromagnetic induction in physics, it can be seen that if a block of metal is placed in an alternating magnetic field or made to cut the magnetic force line in the magnetic field, then an induced current will be generated in the metal block, and this current is in the metal block. Closed, so it is called eddy current. Its basic structure principle is as figure 1 As shown, when the coil is passed an alternating current i 1 , the space around the coil generates an alternating magnetic field H 1 . At this time, an induced electromotive force will be generated in the metal block placed in this magnetic field, thereby forming an eddy current i 2 , the eddy cu...
Claims
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IPC IPC(8): G01B7/02
Inventor 王天娜张连凯
Owner BEIJING UNIV OF CHEM TECH