CN202057335U - Magnetic field measurement system based on Helmholtz magnetic coil - Google Patents
Magnetic field measurement system based on Helmholtz magnetic coil Download PDFInfo
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- CN202057335U CN202057335U CN2011200541589U CN201120054158U CN202057335U CN 202057335 U CN202057335 U CN 202057335U CN 2011200541589 U CN2011200541589 U CN 2011200541589U CN 201120054158 U CN201120054158 U CN 201120054158U CN 202057335 U CN202057335 U CN 202057335U
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Abstract
The utility model discloses a magnetic field measurement system based on a Helmholtz magnetic coil. The magnetic field measurement system comprises a master control board, an LCD (liquid crystal display) display module, a current control module, a Helmholtz magnetic coil, an external photoelectric isolation module and a key input and LED (light-emitting diode) status indication module, wherein the master control board comprises a microprocessor, an LCD drive module, an analog-to-digital conversion output module, a memory, a special input and output interface and a universal output interface; the LCD drive module, the analog-to-digital conversion output module, the memory and the special input and output interface are connected with the microprocessor; an LCD display module is connected with the LCD drive module of the master control board; the key input and LED status indication module is connected with the special input and output interface; the current control module is connected with the analog-to-digital conversion output module; the Helmholtz magnetic coil is connected with the current control module; and the external photoelectric isolation module is connected with the universal output interface. With the adoption of the magnetic field measurement system, the requirements of automatic switching a measured object for high precision, high stability and uniformity of a magnetic field as well as the magnetic field direction can be met.
Description
Technical field
The utility model relates to the magnetic-field measurement field, in particular a kind of magnetic field measurement system based on the Hai Muhuo magnetic coil.
Background technology
Digital compass has had use widely in various modern product.Specifically, in multiple means of transport (as boats and ships, aircraft and automobile), adopted the instrument of digital compass as the travel direction of determining means of transport.In addition, in the mobile apparatus people that can independently advance, also adopted the instrument of digital compass everywhere as the direct of travel of determining the mobile robot.
Digital compass is measured inclination angle about earth direct north as absolute azimuth by using absolute coordinate system, and in described absolute coordinate system, earth direct north is counted as an axle.Because there is Weak magentic-field in the earth, so digital compass can be carried out orientation measurement.Thereby the performance demands of digital compass is very high, and existing measuring system magnetic field precision, stability and the homogeneity that is used for digital compass is not enough, and very high for the cost that can meet the requirements of system.
Therefore, prior art has yet to be improved and developed.
The utility model content
The purpose of this utility model is to provide a kind of magnetic field measurement system based on the Hai Muhuo magnetic coil, is intended to solve the not enough problem of magnetic field precision, stability and homogeneity of existing magnetic field measurement system.
The technical solution of the utility model is as follows: a kind of magnetic field measurement system based on the Hai Muhuo magnetic coil, wherein, comprise master control board, the LCD display module, current control module, the Hai Muhuo magnetic coil, outside photoelectric isolation module, button input and led state indicating module, described master control board comprises microprocessor, the LCD driver module, the digital-to-analog conversion output module, storer, special-purpose IO interface and general output interface, described LCD driver module, the digital-to-analog conversion output module, storer, special-purpose IO interface and general output interface all are connected to described microprocessor; Described LCD display module connects the LCD driver module of described master control board; Described button input is connected described special-purpose IO interface with the led state indicating module; Described current control module connects described digital-to-analog conversion output module, and described Hai Muhuo magnetic coil connects described current control module; Described outside photoelectric isolation module connects described general output interface.
Described magnetic field measurement system based on the Hai Muhuo magnetic coil, wherein, described master control board also comprises the usb communication module, and described usb communication module connects described microprocessor, described system also comprises a host computer, and described host computer connects the usb communication module of described master control board.
Described magnetic field measurement system based on the Hai Muhuo magnetic coil, wherein, described current control module comprises the constant-current control circuit that operational amplifier and power operational amplifier are formed;
The inverting input of described operational amplifier is connected to reference voltage through first resistance; The in-phase input end of described operational amplifier is connected to input voltage and through the 3rd resistance eutral grounding through second resistance respectively; Described operational amplifier output feeds back to the inverting input of described operational amplifier by the 4th resistance;
Described power operational amplifier is connected to the output terminal of described operational amplifier through the 5th resistance; Six resistance and first capacity earth of the inverting input of described power operational amplifier by being connected in series; The in-phase input end ground connection of described power operational amplifier; The output terminal of described power operational amplifier connects the input end of described Hai Muhuo magnetic coil, and the 7th resistance and second capacity earth by being connected in series; The output terminal of described Hai Muhuo magnetic coil be connected in parallel the 8th resistance and the 9th resistance, described the 8th resistance is connected to the inverting input of described power operational amplifier, described the 9th resistance eutral grounding.
Described magnetic field measurement system based on the Hai Muhuo magnetic coil, wherein, described Hai Muhuo magnetic coil is an one dimension Hai Muhuo magnetic coil.
Described magnetic field measurement system based on the Hai Muhuo magnetic coil, wherein, described one dimension Hai Muhuo magnetic magnetic coil is provided with two.
Described magnetic field measurement system based on the Hai Muhuo magnetic coil, wherein, described one dimension Hai Muhuo magnetic magnetic coil adopts internal diameter 300mm, 0.51mm
2Enameled wire is made around 215 circles.
Described magnetic field measurement system based on the Hai Muhuo magnetic coil, wherein, described outside photoelectric isolation module is provided with 4 the tunnel.
Described magnetic field measurement system based on the Hai Muhuo magnetic coil, wherein, described storer is a ferroelectric memory.
Described magnetic field measurement system based on the Hai Muhuo magnetic coil, wherein, the figure place of described digital-to-analog conversion output module is 14.
Described magnetic field measurement system based on the Hai Muhuo magnetic coil, wherein, described the 9th resistance is current sampling resistor, this resistance is 2 watts in 1 Europe, and temperature is floated the metal oxidation resistance for 50ppm.
The beneficial effects of the utility model: the utility model is controlled the Hai Muhuo magnetic coil by adopting current control module, the measurement that is used for digital compass has realized that measurand is to the magnetic field high precision, high stability, the automatic switchover requirement of homogeneity and magnetic direction.
Description of drawings
Fig. 1 is the theory diagram of the system that provides of the utility model.
Fig. 2 is the specific embodiment circuit structure diagram of current control module.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, below the utility model is further described with reference to the accompanying drawing embodiment that develops simultaneously.
From the theory diagram of Fig. 1 as can be seen, the magnetic field measurement system that the utility model provides comprises: master control board, LCD display module, current control module, one dimension Hai Muhuo magnetic coil, outside photoelectric isolation module, host computer, button input and led state indicating module.Described master control board comprises microprocessor MCU, usb communication module, LCD driver module, digital-to-analog conversion output module, ferroelectric memory, special-purpose IO interface and general output interface, and described usb communication module, LCD driver module, digital-to-analog conversion output module, ferroelectric memory, special-purpose IO interface and general output interface all are connected to described microprocessor MCU.Described host computer connects the usb communication module of described master control board; Described LCD display module connects the LCD driver module of described master control board; Described button input is connected described special-purpose IO interface with the led state indicating module; Described current control module connects described digital-to-analog conversion output module, and described one dimension Hai Muhuo magnetic coil connects described current control module; Described outside photoelectric isolation module connects described general output interface.
Described Wei Haimuhuo magnetic coil is provided with two, and described outside photoelectric isolation module is set to 4 the tunnel.
Described master control board is the core of system, realization to the control of peripheral module with communicate by letter, it is the chip of C8051F340 that the MCU of described master control board selects model for use, it is the chip realization of FT232RL that described usb communication module adopts model, described LCD driver module adopts SN74AHC245 to realize, described general digital delivery outlet (I/O mouth) adopts 74HC595D string and conversion integrated chip to realize, parameter is preserved and is adopted ferroelectric memory FM24CL04 to finish, it is the chip realization of AD5645RBRUZ that described digital-to-analog conversion output module adopts model, and its figure place is 14-bit.
Described LCD display module adopts 2 row * 16 characters, and described button input and led state indicating module comprise 6 led state indications, and 5 button implementation patterns switch parameter setting and parameter calibration function.The contact output of described outside photoelectric isolation module adopts NEC solid-state relay PS7206 to realize.Described current control module is the key modules of the system that provides of the utility model, and it adopts power amplifier OPA544 to realize.Described one dimension Hai Muhuo magnetic coil adopts internal diameter ￠ 300mm, 0.51mm
2Enameled wire is made around 215 circles.Outside photoelectric isolation module described in the utility model is provided with four tunnel outputs, and described one dimension Hai Muhuo magnetic coil is provided with two.Wherein 5 buttons are respectively: " RETURN " key, " SET " key, " UP " key, " DOWN " key and " MODE " key.
The magnetic field intensity scope of the Hai Muhuo magnetic coil magnetic field measurement system that process experiment the utility model provides is: 0 ~ 1800mgs; The magnetic field precision is: ± 1mgs; Magnetic field stability is: ± 5mgs/24 hour; Magnetic field is stabilization time: 3 seconds.
The control flow of described magnetic field measurement system comprises automatic mode and manual mode, and wherein said automatic mode is: behind system's power-up initializing, enter the networking state and can carry out online communication, this moment, system can operate accordingly according to the instruction that host computer sends; Described manual mode is: " RETURN " key 3S that presses on the equipment carries out release, treat that release is finished after, equipment will enter manual mode, can carry out quick pattern and general mode this moment and select.If will withdraw from manual mode, then press once more on the equipment " " key, this moment, equipment will withdraw from manual mode to RETURN, entered automatic mode.
Described manual mode comprises quick pattern and general mode, wherein said quick pattern is: press " SET " key on the equipment, to enter quick pattern, under quick pattern, " RETURN " key of pressing on the equipment can be controlled light source switch, " UP " key of pressing on the equipment is controlled the switch of N pole field, pressing " DOWN " key controls the switch of S pole field, if will withdraw from quick pattern, then once more by " SET " key, will withdraw from quick pattern this moment, returns to released state.Described general mode is: press " MODE " key, enter general mode, under general mode, press " MODE " key continuously, can carry out model selection, 5 kinds of patterns are arranged usually: relay output control (Relay OUTPUT), N pole field control (N Magnetic Field), S pole field control (S Magnetic Field), light source control (Brightness) is demarcated control (Calibration).By pressing " UP " key, magnetic field value increases, and presses " DOWN " key then, and magnetic field value reduces.Press " RETURN " key under this pattern, return to released state.
Wherein, described magnetic field calibration mode (Calibration) is: select " Calibration " by pressing " MODE " key, press " SET " key then, enter calibration mode.Under calibration mode, be divided into brightness value again and demarcate, N pole field value is demarcated, and S pole field value is demarcated, and after demarcation is finished, presses " RETURN " key and returns upper mode.N pole field value is demarcated: in N pole field value is demarcated, there are three groups of data to need to demarcate, and owing to exist (be approximately 200 ~ 270mGS, the different location is variant) of terrestrial magnetic field, so calibration value is respectively 300mGS, 900mGS, 1800mGS.Select corresponding calibration value by the SET key, observe the value on the GS Gauss table then, compare the value of GS table and the setting value of equipment, regulate by " UP " key and " DOWN " key, by " UP " key, magnetic field value increases, by " DOWN " key, magnetic field value reduces, and is identical up to two values, presses " SET " key and preserves.S pole field value is demarcated similar, and just calibration value is a bit different, is respectively 0,900mGS, 1800mGS.
Described relay output control (Relay OUTPUT) is: select " Relay OUTPUT " by pressing " MODE " key, press " SET " key and enter relay output control model, then by coming " DIALOG MODE " by " MODE " key, " USB ", " ACC DET ", " ACC ID ", " LIGHT ", " SOUTH ", " NORTH " select to determine, press the switch that " SET " key carries out corresponding control then.Under this pattern, press " RETURN " key and return upper mode.
Because the key modules of the system that described current control module is the utility model to be provided, so the utility model provides a kind of current control module concrete constant current control principle, its particular circuit configurations principle as shown in Figure 2.It forms differential amplifier circuit by operational amplifier OP07D, constitutes subtracter, and forms constant-current control circuit by power operational amplifier OPA544.
The inverting input of described operational amplifier OP07D is connected to reference voltage Vref through first resistance R 2, and Vref is 2.5V in the present embodiment; Through second resistance R, 3 connection value input voltage vin, described input voltage is 0-5V to its in-phase input end respectively; Also through the 3rd resistance R 7 ground connection; Described operational amplifier OP07D output feeds back to its inverting input by the 4th resistance R 6.
Described power operational amplifier OPA544 is connected to the output terminal of described operational amplifier OP07D through the 5th resistance R 10; Six resistance R 14 and first capacitor C 24 ground connection of the inverting input of described power operational amplifier OPA544 by being connected in series; The in-phase input end ground connection of described power operational amplifier OPA544; The output terminal of described power operational amplifier OPA544 connects the input end of described Hai Muhuo magnetic coil, and the 7th resistance R 16 and second capacitor C, 3 ground connection by being connected in series; The output terminal of described Hai Muhuo magnetic coil be connected in parallel the 8th resistance R 12 and the 9th resistance R 18, described the 8th resistance R 12 is connected to the inverting input of described power operational amplifier OPA544, described the 9th resistance R 18 ground connection.Described the 9th resistance R 18 is a current sampling resistor, and this resistance adopts 2 watts in 1 Europe, and temperature is floated the metal oxidation resistance for 50ppm.
The computing formula of output Vout1 of being made of differential amplifier circuit operational amplifier OP07D is as follows:
Vout1=K1(Vin?–Vref），
Wherein, K1=R6/R2=R7/R3=1.
This differential amplifier circuit constitutes a subtracter, its make input voltage vin from 0 ~ 5V be converted into-2.5V ~+2.5V output.
Form the output terminal of the inverting input concatenation operation amplifier OP07D of constant-current control circuit, in-phase input end ground connection by OPA544 power amplifier.The computing formula of the output Vout2 of this power amplifier is derived as follows:
Vout1/R10?=?-Vout2/R12 ------------------------(1)
I?=?-K2*?Vout1
Wherein, K2=R12/R10/R18=0.638,
I?≈?I1 --------------------------(2)
I?=?-K2*K1(Vin?–Vref)?=?-0.638(Vin?–?2.5) -------------(3)
According to (3) formula draw input voltage 0 ~ 5V may command 1.595 ~-1.595A electric current output, thereby reach the purpose of controlling magnetic field intensity, because under the situation that coil turn and coiling radius are determined, magnetic field intensity is directly proportional with electric current I by coil, the switching of the direction of current controlling magnetic field S utmost point and the N utmost point need be considered the influence of terrestrial magnetic field simultaneously.
What the utility model embodiment provided is the magnetic field that one dimension Hai Muhuo magnetic coil produces, and can improve being designed to the magnetic field measurement system that three-dimensional Hai Muhuo magnetic coil produces with this principle.
What the utility model provided specifically is used in the measurement of digital compass based on the magnetic field measurement system of Hai Muhuo magnetic coil.System has realized measurand to the magnetic field high precision, high stability, the automatic switchover requirement of homogeneity and magnetic direction.And the production cost of system is very low.
Should be understood that; application of the present utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or conversion, all these improvement and conversion all should belong to the protection domain of the utility model claims.
Claims (10)
1. magnetic field measurement system based on the Hai Muhuo magnetic coil, it is characterized in that, comprise master control board, LCD display module, current control module, Hai Muhuo magnetic coil, outside photoelectric isolation module, button input and led state indicating module, described master control board comprises microprocessor, LCD driver module, digital-to-analog conversion output module, storer, special-purpose IO interface and general output interface, and described LCD driver module, digital-to-analog conversion output module, storer, special-purpose IO interface and general output interface all are connected to described microprocessor; Described LCD display module connects the LCD driver module of described master control board; Described button input is connected described special-purpose IO interface with the led state indicating module; Described current control module connects described digital-to-analog conversion output module, and described Hai Muhuo magnetic coil connects described current control module; Described outside photoelectric isolation module connects described general output interface.
2. the magnetic field measurement system based on the Hai Muhuo magnetic coil according to claim 1, it is characterized in that, described master control board also comprises the usb communication module, described usb communication module connects described microprocessor, described system also comprises a host computer, and described host computer connects the usb communication module of described master control board.
3. the magnetic field measurement system based on the Hai Muhuo magnetic coil according to claim 1 is characterized in that, described current control module comprises the constant-current control circuit that operational amplifier is formed and power operational amplifier is formed;
The inverting input of described operational amplifier is connected to reference voltage through first resistance; The in-phase input end of described operational amplifier is respectively through the second resistance connection value input voltage with through the 3rd resistance eutral grounding; Described operational amplifier output feeds back to the inverting input of described operational amplifier by the 4th resistance;
Described power operational amplifier is connected to the output terminal of described operational amplifier through the 5th resistance; Six resistance and first capacity earth of the inverting input of described power operational amplifier by being connected in series; The in-phase input end ground connection of described power operational amplifier; The output terminal of described power operational amplifier connects the input end of described Hai Muhuo magnetic coil, and the 7th resistance and second capacity earth by being connected in series; The output terminal of described Hai Muhuo magnetic coil be connected in parallel the 8th resistance and the 9th resistance, described the 8th resistance is connected to the inverting input of described power operational amplifier, described the 9th resistance eutral grounding.
4. the magnetic field measurement system based on the Hai Muhuo magnetic coil according to claim 1 is characterized in that, described Hai Muhuo magnetic coil is an one dimension Hai Muhuo magnetic coil.
5. the magnetic field measurement system based on the Hai Muhuo magnetic coil according to claim 4 is characterized in that, described one dimension Hai Muhuo magnetic coil is provided with two.
6. the magnetic field measurement system based on the Hai Muhuo magnetic coil according to claim 5 is characterized in that, described one dimension Hai Muhuo magnetic coil adopts internal diameter 300mm, 0.51mm
2Enameled wire is made around 215 circles.
7. the magnetic field measurement system based on the Hai Muhuo magnetic coil according to claim 1 is characterized in that, described outside photoelectric isolation module is provided with 4 the tunnel.
8. the magnetic field measurement system based on the Hai Muhuo magnetic coil according to claim 1 is characterized in that, described storer is a ferroelectric memory.
9. the magnetic field measurement system based on the Hai Muhuo magnetic coil according to claim 1 is characterized in that, the figure place of described digital-to-analog conversion output module is 14.
10. the magnetic field measurement system based on the Hai Muhuo magnetic coil according to claim 3 is characterized in that, described the 9th resistance is current sampling resistor, and this resistance is 1 ohm 2 watts, and temperature is floated the metal oxidation resistance of 50ppm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782619A (en) * | 2021-01-31 | 2021-05-11 | 山西大学 | Magnetic field direction quick switching device suitable for Helmholtz coil |
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2011
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782619A (en) * | 2021-01-31 | 2021-05-11 | 山西大学 | Magnetic field direction quick switching device suitable for Helmholtz coil |
| CN112782619B (en) * | 2021-01-31 | 2021-09-17 | 山西大学 | Magnetic field direction quick switching device suitable for Helmholtz coil |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN KERUI TECHNOLOGY CO., LTD. Free format text: FORMER NAME: COLIBRI AUTOMATION (SHENZHEN) CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518057, Guangdong Province, Nanshan District province Shenzhen hi tech Zone, seven industrial district, sparrows first floor Patentee after: Shenzhen Kerui Technology Co., Ltd. Address before: 518057, Guangdong Province, Nanshan District province Shenzhen hi tech Zone, seven industrial district, sparrows first floor Patentee before: Colibri Automation (Shenzhen) Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111130 Termination date: 20160303 |