CN2283829Y

CN2283829Y - Intelligence magnetic means coating thickness measuring instrument

Info

Publication number: CN2283829Y
Application number: CN 96239324
Authority: CN
Inventors: 姚广仁
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-12-10
Filing date: 1996-12-10
Publication date: 1998-06-10
Anticipated expiration: 2006-12-10

Abstract

The utility model relates to an intelligence magnetic means coating thickness measuring instrument. The utility model relates to a device for measuring the thickness of non-magnetic covering layer on a magnetic metal base, wherein, a sensor is composed of a loop which is composed of an inductance coil L with an iron core, an alternating current power supply, and a resistor R. Both ends of the iron core coil are respectively an output terminal of a thickness voltage signal VL; an oscillator can output an alternating current signal to the sensor; the sensor can output a coating thickness signal to a precise detection circuit; the signal can be processed into a readable signal by the precise detection circuit, a differential amplifying circuit, a V/F converter, an SCM, and a liquid-crystal displayer. The measuring instrument can reduce the manufacturing cost. The utility model has the advantages of convenient use, simple and convenient manufacture and modulation, wide measuring range, low power consumption, small machine body, convenient operation, convenient portability, high resolution, and multiple functions.

Description

Intelligent magnetic method coating thickness gauge

The utility model relates to a kind of device of measuring the non magnetic cover thickness on the magnetic metal matrix.

The magnetic method thicknessmeter of releasing on the domestic and international market generally adopts the mutual inductance type magnetoresistive transducer at present, and its power consumption is big, and measurement range is less than normal, does not adopt computer technology, the intellectuality of being unrealized.

The utility model provides a kind of coating thickness gauge that overcomes the prior art shortcoming.

The utility model is realized by following scheme: it is made up of stabilized voltage supply, oscillator, sensor, accurate detecting circuit, differential amplifier circuit, V/F transducer, single-chip microcomputer, LCD, hummer and function key, it is characterized in that sensor constitutes the loop by telefault L, AC power and the resistance R of ribbon core and forms, the iron-core coil two ends be thickness voltage signal V _LOutput terminal, oscillator is to sensor output AC signal, sensor is to accurate detecting circuit output coating thickness signal, accurate detecting circuit is exported to differential amplifier circuit, differential amplifier circuit is exported to the V/F transducer, and the V/F transducer is exported to single-chip microcomputer, and single-chip microcomputer is exported to LCD and hummer, function key links to each other with single-chip microcomputer, exports direct-current working volts by stabilized voltage supply to oscillator, sensor, accurate detecting circuit, differential amplifier circuit, V/F transducer and single-chip microcomputer.

The utlity model has following advantage:

1, adopted computer technology, realized the intellectuality of magnetic method coating thickness detector, the part hardware capability of existing thicknessmeter can be finished by software on the utility model, has reduced manufacturing cost, and all measuring process is finished by the key membrane switch operation, and is easy to use.

2, adopted the self-induction type magnetoresistive transducer, it is easy to make debugging.

3, low power dissipation design, Overall Power Consumption 60mw.

4, body pocket microminiature, use, easy to carry.

5, the LCD numeral shows, the resolution height, and resolution can reach 10 μ m, no vision error.

6, function is many, has realized robotization, intellectuality.During as the operating supply voltage deficiency, prompting operation person changes battery automatically, and each the measurement when showing measurement result has buzz prompting operator measurement to finish.

7, measurement range is wide, 0-3mm.

Accompanying drawing 1 is the magnetoresistive transducer synoptic diagram of coating thickness gauge;

Accompanying drawing 2 is the schematic block circuit diagram of coating thickness gauge;

Accompanying drawing 3 is the circuit theory diagrams of coating thickness gauge.

Below in conjunction with accompanying drawing the utility model is further described:

As Fig. 2, shown in 3, coating thickness gauge is by stabilized voltage supply 10, oscillator 1, sensor 2, accurate detecting circuit 3, differential amplifier circuit 4, V/F transducer 5, single-chip microcomputer 6, liquid crystal display circuit 7, hummer 8 and function key 9 are formed, wherein oscillator 1 is in parallel with sensor 2, for sensor 1 provides voltage is the AC signal of 300HZ for the 4V frequency, the input end of the output terminals A of sensor 2 and accurate detecting circuit 3 joins, the output terminal B of accurate detecting circuit 3 and the input end of differential amplifier circuit 4 link, the output terminal C and the V/F transducer 5 of differential amplifier circuit 4 link, the output terminal D and the single-chip microcomputer 6 of V/F transducer link, function key 9 links with single-chip microcomputer 6, single-chip microcomputer 6 is to liquid crystal display circuit 7 output display data signal, measure the signal that finishes to hummer 8 outputs, stabilized voltage supply 10 is to oscillator 1, sensor 2, accurate detecting circuit 3, differential amplifier circuit 4, V/F transducer 5, single-chip microcomputer 6 output services voltages.

As shown in Figure 1, the magnetoresistive transducer loop that the telefault L that has iron core and 4 volt of 300 hz AC power supply and resistance R form of serving as reasons, telefault L two ends are signal output part.

During measurement, the end face of sensor L and testee are by touching, at this moment, ferromagnetism matrix by the magnetic line of force in the iron core and testee is coupled, when the testee coating thickness not simultaneously, the magnetic resistance of magnetic loop is just different, thus the inductance value that causes passing telefault L changes.At this moment, the voltage V at telefault two ends _LAlso will change, thereby realized that physical quantity thickness is to electric weight V with the difference of coating thickness _LTransformation.

Obtain thickness signal V at sensor 2 two ends _LAfterwards, import accurate detecting circuit 3, convert the thickness that exchanges to the direct current thickness signal, through differential amplifier 4 signal is amplified again, the voltage signal of this direct current thickness information is transformed into frequency signal through V/F transducer 5, again this frequency signal is sent into single-chip microcomputer 6.IC among Fig. 3 ₇Be latch, IC ₆Be memory under program, IC ₈Be single-chip microcomputer, IC ₆, IC ₇, IC ₈Constitute the single-chip microcomputer mini system, under the cooperation of relative program, finished functions such as scale transformation, gamma correction, code system transformation.

IC among Fig. 3 ₉, IC ₁₀, IC ₁₁With the circuit of LCD formation LCD 7, IC ₉, IC ₁₀, IC ₁₁Be made up of the CD4543 chip, realize decoding function, the binary-coded decimal that single-chip microcomputer is exported is translated into seven segment code, drives LCD and shows measurement result.

Claims

1, a kind of intelligent magnetic method coating thickness gauge, it is made up of stabilized voltage supply, oscillator, sensor, accurate detecting circuit, differential amplifier circuit, V/F transducer, single-chip microcomputer, LCD, hummer and function key, it is characterized in that sensor constitutes the loop by telefault L, AC power and the resistance R of ribbon core and forms, the iron-core coil two ends be thickness voltage signal V _LOutput terminal, oscillator is to sensor output AC signal, sensor is to accurate detecting circuit output coating thickness signal, accurate detecting circuit is exported to differential amplifier circuit, differential amplifier circuit is exported to the V/F transducer, and the V/F transducer is exported to single-chip microcomputer, and single-chip microcomputer is exported to LCD and hummer, function key links to each other with single-chip microcomputer, exports direct-current working volts by stabilized voltage supply to oscillator, sensor, accurate detecting circuit, differential amplifier circuit, V/F transducer and single-chip microcomputer.