CN202837401U - Portable intelligent metal electrical conductance meter - Google Patents
Portable intelligent metal electrical conductance meter Download PDFInfo
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- CN202837401U CN202837401U CN 201220420600 CN201220420600U CN202837401U CN 202837401 U CN202837401 U CN 202837401U CN 201220420600 CN201220420600 CN 201220420600 CN 201220420600 U CN201220420600 U CN 201220420600U CN 202837401 U CN202837401 U CN 202837401U
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Abstract
The utility model provides a portable intelligent metal electrical conductance meter and relates to metal electrical conductance detection equipment. The portable intelligent metal electrical conductance meter is used for identifying and examining alloys, examining heat treatment states, detecting material levels and sorting metals. The portable intelligent metal electrical conductance meter is provided with a signal extracting module, a signal processing module, a microprocessor module and a power source management module. The signal extracting module includes a 60KHz high-frequency sinusoidal signal generator, a voltage follower and a differential alternating-current bridge circuit; the signal processing module comprises a phase-sensitive detection circuit, a four-order low-pass filtering circuit and an A/D conversion circuit; the microprocessor module comprises a microprocessor, an LCD display, a memory, and a PC communication and temperature measurement/compensation circuit; and the power source management module includes a lithium battery and a power source conversion circuit. The portable intelligent metal electrical conductance meter is advantageous in strong anti-interference capability, digital temperature compensation, no need for zero adjustment of a standard test block, hand-hold convenience, operational simplicity and the like.
Description
Technical field
The utility model relates to a kind of conductivity metal checkout equipment, relates in particular to a kind of portable intelligent metallic conductance instrument.
Background technology
The metallic conductance instrument is a kind of equipment that is used for measuring conductivity metal, can be used for measuring and analyzing the conductivity value (as measuring the conductivity value of silver, copper, aluminium, magnesium, titanium, austenite etc. and alloy thereof) of nonferrous materials and alloy thereof, its detect principle by: pop one's head in and press close to be surveyed metal being connected with inductance sensor that high-frequency ac encourages, set up alternating magnetic field by inductance sensor probe magnetic test coil, this alternating magnetic field is by the metal of surveying, and the electromagnetic induction effect occurs with it, in the survey metal, set up eddy current.The eddy current in the metal surveyed also can produce the magnetic field of oneself, and the effect of eddy current magnetism also can change the power in former magnetic field, and then the impedance of inductance sensor probe magnetic test coil changes.Therefore when the institute metal surface of surveying or closely the surface defective or measurement appear and metal material not simultaneously, intensity and the distribution of eddy current will be had influence on, the variation of eddy current has caused again the variation of inductance sensor probe magnetic test coil impedance, according to this variation, just can indirectly know in the metal of surveying the existence of defective and kind and the performance of metal material whether change.
Traditional metallic conductance instrument volume is larger, is inconvenient to carry, and a little less than the antijamming capability, be subjected to the impact of temperature and environment large, so measurement result is not ideal enough.In addition, traditional metallic conductance instrument adopts pointer instrument to show that reading out data bothers very much, and does not possess preservation and the PC communication function of data.
At present, conductivity metal checkout equipment on the market generally all needs reference block zeroing, and this is so that complicated operation, and reference block aging after so that measure inaccurate.And device structure is complicated, high expensive.
Chinese patent ZL94208460.8 provides a kind of Intelligent diagometer, is comprised of analog measuring circuit unit and digital circuit unit.Electric waveguide measuring circuit in the analog measuring circuit comprises potential electrode, square-wave generator, range automatic switching circuit, capacitor compensating circuit, current-voltage conversion circuit and rectifying output circuit.This instrument has the advantages such as automatic range switching, the compensation of high-precision large-range distributed capacitance, digital temperature compensation.This instrument function is strong, and is easy to operate, and accuracy of instrument guarantees in each range ability to be 1%, has simultaneously the output of bound alerting signal.Can be widely used in the water treatment field of the production runes such as chemical industry, medicine, electric power, metallurgy.
Summary of the invention
The purpose of this utility model is to provide a kind of antijamming capability strong, hand-holdable carrying, the digital temperature compensation, data are by LCD display, but save data also can carry out communication with PC, and is without the reference block zeroing, easy to operate, cost is low, can be used for identifying and checking the portable intelligent metallic conductance instrument of alloy, examination condition of heat treatment, test material grade, metal sorting etc.
The utility model is provided with the signal extraction module, signal processing module, microprocessor module and power management module;
The signal extraction module comprises high frequency sinusoidal signal generator, voltage follower and differential alternating current bridge circuit; High frequency sinusoidal signal generator adjustable frequency and amplitude, the high frequency sinusoidal signal generator connects voltage follower, in order to improve the carrying load ability of high frequency sinusoidal signal, the signal of voltage follower out divides two-way that driving source is provided afterwards: the one tunnel connects differential alternating current bridge circuit, another road connects the phase-sensitive detection circuit in the signal processing module, so that the modulation and demodulation process has the driving source of same frequency, a brachium pontis of differential alternating current bridge adopts the inductance sensor probe;
Signal processing module comprises phase-sensitive detection circuit, quadravalence low-pass filter circuit and A/D change-over circuit; Phase-sensitive detection circuit output termination quadravalence low-pass filter circuit input end, quadravalence low-pass filter circuit output termination A/D change-over circuit input end, the microprocessor signals input end in the A/D change-over circuit input termination microprocessor module;
Microprocessor module comprises microprocessor, LCD display, storer, PC communication and temperature survey compensating circuit; Power management module comprises lithium battery power supply and power-switching circuit; Microprocessor control signal output terminal connects respectively LCD display, storer, PC communication and temperature survey compensating circuit; Microprocessor control LCD display, can will show that data are stored in the storer, and memory data can be read LCD display, microprocessor control PC communication, the measurement data that is stored in the storer is sent on the PC, the temperature survey compensating circuit extracts temperature, and microprocessor carries out compensation data;
Power management module comprises lithium battery and power-switching circuit, and lithium battery connects the power-switching circuit input end, and the power-switching circuit output terminal connects respectively signal extraction module, signal processing module and microprocessor module.Lithium battery directly-chargeable, power-switching circuit provide the power supply of each module stability.
Described signal extraction module, signal processing module, microprocessor module and power management module are integrated on the same circuit board.
Compare with existing metallic conductance instrument, the present invention has following outstanding advantages:
1) antijamming capability is strong.
2) do not need the reference block zeroing.
3) hand-held easy to carry, simple to operate.
Description of drawings
Fig. 1 is the theory diagram of the utility model embodiment.
Fig. 2 is the circuit theory diagrams of the signal extraction module of the utility model embodiment.
Fig. 3 is the circuit theory diagrams of the signal processing module of the utility model embodiment.
Fig. 4 is the circuit theory diagrams of the microprocessor module of the utility model embodiment.
Fig. 5 is the circuit theory diagrams of the power management module of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Referring to Fig. 1, the utility model embodiment mainly by high frequency sinusoidal signal generator 1, voltage follower 2, alternating current bridge 3, differential amplifier circuit 4, phase-sensitive detection circuit 5, quadravalence low-pass filter circuit 6, A D change-over circuit 7, microprocessor 8, LCD display 9, storer 10, PC communication 11, temperature survey compensating circuit 12 and lithium battery power supply and power-switching circuit 13 form.Wherein, high frequency sinusoidal signal generator 1, voltage follower 2, differential alternating current bridge circuit (comprising alternating current bridge 3 and differential amplifier circuit 4) have formed the signal extraction module; Phase-sensitive detection circuit, quadravalence low-pass filter circuit and A/D change-over circuit have formed signal processing module; Microprocessor, LCD display, storer, PC communication and temperature survey compensating circuit have formed microprocessor module; Lithium battery power supply and power-switching circuit have formed power management module.
High frequency sinusoidal signal generator 1 connects voltage follower 2, and signal out divides two-way that driving source is provided afterwards: the one tunnel connects alternating current bridge 3 and differential amplifier circuit 4; Another road connects phase-sensitive detection circuit 5.Phase-sensitive detection circuit 5 connects quadravalence low-pass filter circuit 6, be connected with described A/D change-over circuit 7 again, A/D change-over circuit 7 digital signal output ends connect microprocessor 8 signal input parts, and microprocessor 8 signal controlling ends connect respectively LCD display 9, storer 10, PC communication 11 and temperature survey compensating circuit 12.Lithium battery power supply and power-switching circuit 13 are the supply power of described signal extraction module, signal processing module and microprocessor module.Described signal extraction module, signal processing module, microprocessor module and power management module are integrated on the same circuit board.
Referring to Fig. 2 and Fig. 1, high frequency sinusoidal signal generator 1 adjustable frequency and the amplitude of described signal extraction module, high frequency sinusoidal signal generator 1 connects voltage follower 2, and signal out divides two-way that driving source is provided afterwards: the one tunnel connects the differential alternating current bridge circuit that is made of alternating current bridge 3 and differential amplifier circuit 4; Another road connects described phase-sensitive detection circuit 5, so that the modulation and demodulation process has the driving source of same frequency.Inductance sensor probe L1 is as a brachium pontis of differential alternating current bridge.Adjustment precision variable resistor RW3 regulates the output frequency of sinusoidal signal to 60kHz, and adjustment precision variable resistor RW2 makes output amplitude to the 1.5V.U2(XR2206) pin two is sine output signal, connects one by high speed amplifier U4(LF353) voltage follower 2 that consists of, in order to improve the carrying load ability of high frequency sinusoidal signal.Voltage follower connects dual power supply.The differential alternating current bridge circuit that alternating current bridge 3 and differential amplifier circuit 4 consist of is comprised of resistance R 11, the accurate adjustable resistance RW1 of 5K, inductance L 1 and the L2 of 2 330 μ H of 3K.
Referring to Fig. 3 and Fig. 1, the phase-sensitive detection circuit 5 of described signal processing module connects quadravalence low-pass filter circuit 6, be connected with A/D change-over circuit 7 again, and be to send into microprocessor 8 corresponding input ports after the digital signal with analog signal conversion.Phase-sensitive detection circuit 5 is by LF353 and respective peripheral the electric circuit constitute, and the pin two place of LF353 connects the high frequency sinusoidal signal in the signal extraction module, so that the modulation and demodulation process has the driving source of same frequency.Quadravalence low-pass filter circuit 6 is by LF353 and respective peripheral the electric circuit constitute, and its cutoff frequency is 1K, and gain is 3.
Referring to Fig. 4 and Fig. 1, the microprocessor 8 control LCD display 9 of described microprocessor module, storer 10, PC communication 11, temperature survey compensating circuit 12.Microprocessor control LCD display can will show that data are stored in the storer, and memory data can be read LCD display.Microprocessor control PC communication sends to the measurement data that is stored in the storer on the PC.The temperature survey compensating circuit extracts temperature, and microprocessor carries out compensation data.The voltage signal that obtains behind low-pass filter is stored in the microprocessor after transforming through AD.Temperature-compensation circuit 12 is comprised of digital thermometer, reading and writing and finish the required power supply of temperature inversion and provided by data line itself.Through the conductivity value after the temperature compensation by LCD display out.The data communication device of storage is crossed serial ports and is connected to PC, receives with the serial ports assistant.
Referring to Fig. 5 and Fig. 1, the lithium battery power supply of described power management module and power-switching circuit 13 are used for to described signal extraction module, signal processing module and microprocessor module power supply.Lithium battery directly-chargeable, power-switching circuit provide the power supply of each module stability.The power supply lithium battery power supply, diode 1N4148 prevents reverse power connection.Obtain respectively the power supply of stable 12V, 8V, 5V with three TL431 and peripheral circuit.The indirect electric capacity of 1 pin of TL431 and 3 pin reduces power supply noise.ICL7660S negative supply chip obtains-the 8V power supply.
Claims (2)
1. portable intelligent metallic conductance instrument is characterized in that being provided with the signal extraction module, signal processing module, microprocessor module and power management module;
The signal extraction module comprises high frequency sinusoidal signal generator, voltage follower and differential alternating current bridge circuit; High frequency sinusoidal signal generator adjustable frequency and amplitude, the high frequency sinusoidal signal generator connects voltage follower, in order to improve the carrying load ability of high frequency sinusoidal signal, the signal of voltage follower out divides two-way that driving source is provided afterwards: the one tunnel connects differential alternating current bridge circuit, another road connects the phase-sensitive detection circuit in the signal processing module, so that the modulation and demodulation process has the driving source of same frequency, a brachium pontis of differential alternating current bridge adopts the inductance sensor probe;
Signal processing module comprises phase-sensitive detection circuit, quadravalence low-pass filter circuit and A/D change-over circuit; Phase-sensitive detection circuit output termination quadravalence low-pass filter circuit input end, quadravalence low-pass filter circuit output termination A/D change-over circuit input end, the microprocessor signals input end in the A/D change-over circuit input termination microprocessor module;
Microprocessor module comprises microprocessor, LCD display, storer, PC communication and temperature survey compensating circuit; Power management module comprises lithium battery power supply and power-switching circuit; Microprocessor control signal output terminal connects respectively LCD display, storer, PC communication and temperature survey compensating circuit; Microprocessor control LCD display, can will show that data are stored in the storer, and memory data can be read LCD display, microprocessor control PC communication, the measurement data that is stored in the storer is sent on the PC, the temperature survey compensating circuit extracts temperature data, carries out compensation data by microprocessor;
Power management module comprises lithium battery and power-switching circuit, and lithium battery connects the power-switching circuit input end, and the power-switching circuit output terminal connects respectively signal extraction module, signal processing module and microprocessor module.Lithium battery directly-chargeable, power-switching circuit provide the power supply of each module stability.
2. portable intelligent metallic conductance instrument as claimed in claim 1 is characterized in that described signal extraction module, signal processing module, microprocessor module and power management module are integrated on the same circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220420600 CN202837401U (en) | 2012-08-22 | 2012-08-22 | Portable intelligent metal electrical conductance meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220420600 CN202837401U (en) | 2012-08-22 | 2012-08-22 | Portable intelligent metal electrical conductance meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202837401U true CN202837401U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220420600 Expired - Fee Related CN202837401U (en) | 2012-08-22 | 2012-08-22 | Portable intelligent metal electrical conductance meter |
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| CN (1) | CN202837401U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541318A (en) * | 2018-10-11 | 2019-03-29 | 宁波大学 | A kind of silicon waveguide Conductivity detection circuit |
-
2012
- 2012-08-22 CN CN 201220420600 patent/CN202837401U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541318A (en) * | 2018-10-11 | 2019-03-29 | 宁波大学 | A kind of silicon waveguide Conductivity detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20150822 |
|
| EXPY | Termination of patent right or utility model |