Eddy current sensor and its material gear adjustment resistance determination method and test method
An eddy current sensor and gear adjustment technology, applied in the sensor field, can solve the problems of low work efficiency and poor economic benefits, and achieve the effect of overcoming the influence
Active Publication Date: 2019-03-05
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0006] The embodiment of the present invention provides an eddy current sensor and its material gear adjustment resistance determination method and testing method to solve the problem of detecting different materials in the prior art and needing to replace the corresponding sensor, resulting in poor economic benefits and low work efficiency question
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[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0026] In order to be able to detect different target materials, the inventor has carried out the following research: First, the metal conductor of the eddy current sensor is approximately regarded as a short-circuit coil, so the following can be obtained: figure 2 The equivalent circuit diagram of the air-core transformer is shown.
[0027] Among them, a mutual inductance coefficient M, R is defined between the coil and the metal conductor to be tested 1 is the coil resistance, L 1 is the coil inductance, R 2 is the conductor resistance, L 2 Is the conductor inductance, U is the excitation source voltage.
[0028] According to the equivalent circuit, it can be known from Kirchhoff's theorem:
[0029]
[0030] Among them, the equivalent inductance and internal resistance of th...
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The invention discloses an eddy current sensor, a determining method of the material level adjustment resistor of the eddy current sensor, and a test method. The eddy current sensor includes a high-frequency signal excitation source, a measurement signal generating circuit and an output terminal which are connected with one another sequentially; the measurement signal generating circuit includes a parallel resonant circuit; the parallel resonant circuit includes a coil branch and a capacitor branch which are connected in parallel; the coil branch includes a probe coil and a material level adjustment resistor which are connected in series; one end of the coil branch and one end of the capacitor branch are connected with the high-frequency signal excitation source; and the other ends of the coil branch and the capacitor branch are grounded. According to the eddy current sensor of the invention, equivalent coil impedance change due to the conductivity change of target materials to be detected can be offset through the material level adjustment resistor, so that the correlation indexes, such as sensitivity, of the eddy current sensor, can be changed, and finally, the change of the resonant voltage output characteristic curves of different target materials with displacement can be consistent, and influence on test results caused by different test materials can be eliminated.
Description
technical field [0001] The invention relates to the field of sensors, in particular to an eddy current sensor and a method for determining and testing a material gear adjustment resistance thereof. Background technique [0002] Due to the advantages of simple structure, high sensitivity and strong anti-interference ability, eddy current sensors have been widely used in mechanical parameter measurement, non-destructive testing of oil pipelines, aerospace and other fields. [0003] At present, the working methods of commonly used eddy current sensors are divided into fixed frequency amplitude modulation method, variable frequency amplitude modulation method and frequency modulation method in principle. in, figure 1 The circuit schematic diagram of the fixed-frequency amplitude modulation method is shown, which has the advantages of high stability and easy parameter adjustment, and is the mainstream design scheme. [0004] Such as figure 1 As shown, the eddy current sensor i...
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IPC IPC(8): G01D5/14G01D5/16G01B7/02G01D18/00
CPCG01B7/02G01D5/14G01D5/16G01D18/00
Inventor 俞灯军贺永玲胡叨福
Owner GREE ELECTRIC APPLIANCES INC