CN109141342A - A kind of handheld portable precision strain gauge - Google Patents
A kind of handheld portable precision strain gauge Download PDFInfo
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- CN109141342A CN109141342A CN201810779507.XA CN201810779507A CN109141342A CN 109141342 A CN109141342 A CN 109141342A CN 201810779507 A CN201810779507 A CN 201810779507A CN 109141342 A CN109141342 A CN 109141342A
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- input
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- chip microcontroller
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- power supply
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
本发明公开一种手持便携式精密应变测量仪，属于材料的应变量测量领域。其特征在于，输入电压通过输入端AD转换器1进行数字采样变成数字信号经隔离器件2进行隔离然后再输入到单片机4进行过压/欠压比较；输出电压经输出端AD转换器3进行数字采样变成数字信号直接输入到单片机4进行过压/欠压比较；工作环境的温度由温度传感器6得到数据后输入至单片机4进行温度比较；单片机4将最终比较的结果通过显示部分5进行显示；单片机4依据比较的结果产生是否关闭的命令通过隔离器件2对DC/DC隔离电源模块进行统一的开关控制；外来控制命令通过控制接口7输入至单片机4进而对电源组进行手动控制。
The invention discloses a hand-held portable precision strain measuring instrument, which belongs to the field of strain amount measurement of materials. It is characterized in that, the input voltage is digitally sampled by the input terminal AD converter 1 and becomes a digital signal, which is isolated by the isolation device 2 and then input to the single-chip microcomputer 4 for overvoltage/undervoltage comparison; the output voltage is processed by the output terminal AD converter 3. The digital sampling becomes a digital signal and is directly input to the single-chip microcomputer 4 for over-voltage/under-voltage comparison; the temperature of the working environment is obtained from the temperature sensor 6 and then input to the single-chip microcomputer 4 for temperature comparison; Display; the single-chip microcomputer 4 generates a command of whether to turn off or not through the isolation device 2 to perform unified switch control on the DC/DC isolation power supply module according to the comparison result; external control commands are input to the single-chip microcomputer 4 through the control interface 7 to manually control the power supply group.
Description
Technical field
The invention belongs to the dependent variable fields of measurement of material, and in particular to a kind of handheld portable precision strain gauge.
Background technique
The mechanical property of material is one of basic performance of all material, and wherein the deflection of material in all cases is logical
The strain of common used material indicates.The physical significance of strain is the deformation quantity of material and the ratio of material original orientation length, is
One nondimensional physical quantity.It is very frequent for the use of deformeter in many engineering fields also or when college teaching.Work
In journey it should be understood that and measure the deformation quantities of many objects, in colleges and universities it is mostly be certain professions teaching use.
The invention device can carry out the strain measurement of multiple fields, and carry out on the basis of traditional deformeter some
It improves.It is functional mode first, apparatus of the present invention use battery functi on, compared to traditional power supply function, apparatus of the present invention function
Energy mode is more flexible, at many inconvenient places such as remote mountains etc., it is not necessary to use in the place for having power supply；And this
Invention device is there are also portable feature, and usually all shape is larger for traditional strain gauge arrangement, carries very inconvenient, many needs
It is smaller or when need that far place to be applied to space, apparatus of the present invention are more convenient flexibly.Meanwhile the present invention
Apparatus function is more complete, increases backlight, calculates etc. function, and test it is sensible there are three 0 °, 45 °, 90 ° so that making
With when can increase more feasibilities.
The experimental provision is easy to operate, cheap, performance is stable, strong applicability, highly-safe, easy to use, can have
The dynamic mechanical test of the various ball cylindrical materials of progress of effect.
Summary of the invention
The purpose of the present invention is to provide a kind of production methods of handheld portable precision strain gauge.
The object of the present invention is achieved like this:
A kind of handheld portable precision strain gauge, comprising: TVS diode 0, input terminal AD converter 1, isolating device
2, output terminals A D converter 3, single-chip microcontroller 4, display portion 5, temperature sensor 6, control interface 7 and isolated power supply 8；Its feature exists
In isolated power supply 8 is low power DC/DC isolated power supply module, to input terminal AD converter 1, output terminals A D converter 3, list
Piece machine 4, display portion 5, temperature sensor 6 and control interface 7 are powered；TVS diode 0 under normal conditions at high-impedance state,
When voltage be more than TVS diode 0 itself threshold value after will transient switching, when additional power source open when, can moment generate one
TVS diode 0 is connected in a high-voltage impact, constitutes circuit with input common end, TVS diode 0 is restored just after impact
Normal state；Input voltage becomes digital signal by the progress digital sample of input terminal AD converter 1 is isolated through isolating device 2
Then it is input to single-chip microcontroller 4 again and carries out over-voltage/under-voltage comparison；Output voltage carries out digital sample change through output terminals A D converter 3
Single-chip microcontroller 4, which is directly inputted to, at digital signal carries out over-voltage/under-voltage comparison；The temperature of working environment is obtained by temperature sensor 6
It is input to single-chip microcontroller 4 after data and carries out temperature comparison；Single-chip microcontroller 4 shows final comparison result by display portion 5；
Display portion 5 shows comparison result, current environmental temperature and input/output voltage value；Single-chip microcontroller 4 is produced according to comparison result
The raw order whether closed carries out unified switch control to DC/DC isolated power supply module by isolating device 2；External control life
Order is input to single-chip microcontroller 4 by control interface 7 and manually controls to power supply group, and control interface 7 as needed is by monolithic
The processing result of machine 4 is shown on computers.
Compared with prior art, the beneficial effects of the present invention are:
This circuit is to use digital circuit can be with function required for flexible setting and can be with far distance control, anti-interference ability
It is relatively strong.The present invention can the input and output voltage of real-time detection multichannel DC/DC isolated power supply and the temperature of ambient enviroment, and will
Collected analog quantity becomes digital quantity and is input in single-chip microcontroller to carry out data monitoring, when a certain power work is abnormal
It waits and shutdown or startup backup power source just is carried out to power-supply device, the easy to use and flexible of the circuit is in the system supported power supply
It can play the role of power supply selection in debugging, simultaneously because the addition of serial ports can control power-supply device at a distance
System, and anti-interference ability is stronger；The circuit it is low in cost.
Detailed description of the invention
Fig. 1 is internal module schematic diagram；
Fig. 2 is Figure of description；
Fig. 3 is equipment appearance figure；
Fig. 4 is rear panel figure；
Fig. 5 is front panel figure；
Fig. 6 is measuring principle block diagram.
Specific embodiment
The present invention is explained in detail with reference to the accompanying drawing:
Specific embodiment one:
A kind of handheld portable precision strain gauge belongs to the invention device of material mechanical performance fields of measurement, the device
It is intended to through internal single-chip microcontroller, control circuit and element, to the measurement that the object connected by electric wire is strained, then by certainly
The LCD liquid crystal display of body reads corresponding numerical value, so that it is determined that the strain value size of object being measured, it then can also be to it
Mechanics parameter needed for him calculates.Mainly by TVS diode 0, input terminal AD converter 1, isolating device 2, output inside it
Hold AD converter 3, single-chip microcontroller 4, display portion 5, temperature sensor 6, control interface 7, isolated power supply 8 etc. and a few part structures of keyboard
At.When apparatus of the present invention work, the object under test electric wire for posting foil gauge is connect with apparatus of the present invention interface, is then beaten
Switch power supply carries out the setting of sensitivity, and then the numerical value in three channels returns to zero, after applying respective loads to testee, just
Corresponding strain value can be shown on LCD liquid crystal display equipment screen.Other than most basic measurement strains function, present invention dress
It sets and is also equipped with compensation, storage, computing function, can first store the experimental data of front when carrying out multiple groups experiment, and
After being all measured, all strain values are combined calculating；Furthermore the present apparatus is also equipped with the function such as backlight and electric power detection
Can, it is easy to use and monitors.
Essence of the invention is exactly: to mistake/under-voltage detection of the output voltage of single power module and operating ambient temperature
Monitoring, when any one Parameters variation exceed given range when, closing control just is carried out to entire isolated power supply group, from
And realize the protection to institute's power supply unit.
Power module a to power module n is n DC/DC isolated power supply module, and each power module generally only provides one kind
Voltage, n are worth selection related with the system of practical application, and certain n value is the smaller the better.
The effect of TVS diode 0 be under normal conditions at high-impedance state, will wink after voltage is more than the threshold value of pipe itself
Between be connected.When additional power source is opened, a high-voltage impact can be generated in moment, TVS diode 0 is connected, it is public with input
End constitutes circuit, the diode recovery normal condition after impact altogether.Influence this reduces impact to power-supply device rises
To the protective effect of anti-input impact.
The primary power source voltage of input is transformed into the digital signal of nbit by isolating device by input terminal AD converter 1
2, which are input to single-chip microcontroller 4, carries out over-voltage/under-voltage comparison, since DC/DC power module is typically all wide range input close limit
Voltage output, thus can by compare it is upper and lower be limited to +/- the 20% of input voltage value in the range of, be more than this range just
Provide alarm.
The digital signal that will be transformed into nbit by output terminals A D converter 3 per power supply all the way of output is input to monolithic
Machine 4 carries out over-voltage/under-voltage comparison.The bound compared is according to actual needs depending on the input voltage range of power supply unit.
Temperature sensor 6 monitors the operating ambient temperature of power supply group, selects digital temperature sensor, can thus incite somebody to action
Digital signal is directly transmitted to single-chip microcontroller 4, carries out temperature comparison inside it, and the lower limit compared can be chosen in n power module
Required operating ambient temperature it is minimum 85% or so.
Display portion 5 according to the volume needs of physical device must can also should not, its effect is exactly to visually see
It surveys, plays the role of convenient, the content of display can be set according to demand.
Control interface 7 is the transmission port of manual command, can be a common switch, is also possible to serial ports, in this way
The internal information of single-chip microcontroller 4 can be passed on the control computer of whole system, the working condition of its power supply is monitored.
Isolated power supply 8 is low power DC/DC power module, powers to the component in dotted line frame, can thus protect
Card power protecting and controling circuit is constantly in working condition, and is isolated with the primary power source of input.
Isolating device 2 is a critically important link, it plays the role of by input sample and output sampling isolation, such as
Isolation is not added in fruit, and the practical transfer efficiency for proving seriously reduce DC/DC module damages power supply.
Single-chip microcontroller 4 is the CPU of this circuit, and the transmitting-receiving of all orders will be executed by it, all collected power supplys
The working condition of equipment will also be transmitted to it.
Attached drawing gives the composition of the device of the invention: by TVS diode 0, input terminal AD converter 1, isolating device 2,
Output terminals A D converter 3, single-chip microcontroller 4, display portion 5, temperature sensor 6, control interface 7, isolated power supply etc. 8 etc. forms,
Middle isolated power supply 8 be small power electric source module it be to power to the component part in dotted line frame.
The course of work:
Input voltage by input terminal AD converter 1 carry out digital sample become digital signal through isolating device 2 carry out every
Over-voltage/under-voltage comparison is carried out from single-chip microcontroller 4 is then input to again；Output voltage carries out digital sample through output terminals A D converter 3
Become digital signal and is directly inputted to the progress over-voltage/under-voltage comparison of single-chip microcontroller 4；The temperature of working environment is counted by temperature sensor 6
Word temperature sensor is sensitive, is input to the progress temperature comparison of single-chip microcontroller 4 after obtaining data；Single-chip microcontroller 4 is by final comparison result
It is shown by display portion 5；Display portion 5 shows comparison result, current environmental temperature and input/output voltage value；
Single-chip microcontroller 4 generates that the order whether closed unites to DC/DC isolated power supply module by isolating device 2 according to comparison result
One switch control；External control command is input to single-chip microcontroller 4 by control interface 7 and manually controls to power supply group,
Control interface 7 as needed can also show the processing result of single-chip microcontroller 4 on computers.
Specific embodiment two:
A kind of handheld portable precision strain gauge, it is characterised in that: the device mainly includes TVS diodes 0, input
Hold AD converter 1, isolating device 2, output terminals A D converter 3, single-chip microcontroller 4, display portion 5, temperature sensor 6, control interface
7, isolated power supply 8 etc. and several parts such as external LCD liquid crystal display equipment screen and keyboard.It can be achieved in multiple fields such as mechanic
Journey, aerospace, civil engineering, national defense industry, communications and transportation etc., the strain value measurement of object；By being glued on testee
Foil gauge is pasted, and runs wires to the control channel interface on foil gauge and invention device, recycles itself control function, it will be by
The strain that object generates is surveyed to show by LCD liquid crystal display equipment screen.Then subsequent calculating can be carried out as needed
And utilization.
The TVS diode 0 is equivalent to one big resistance value element, when voltage is more than its maximum permissible value, electricity
Road will be connected automatically.When work, the voltage pulse of an external moment can make TVS diode 0 be connected, and entirely input public
End constitutes closed circuit state.After surge voltage, TVS diode 0 is back to normal, this just reduces pulse high-voltage well
The damage of equipment is influenced, is played a protective role.
The main function of the input terminal AD converter 1 is the number letter that the primary power source voltage of input is converted to nbit
Number, it is used for module below；And what is exported will be transformed into the number of nbit per power supply all the way by input terminal AD converter 1
Signal is input to single-chip microcontroller 4 and carries out over-voltage/under-voltage comparison.
The isolating device 2 accepts the digital signal for the nbit being converted to after the processing of input terminal AD converter 1, and connects
Be transmitted to next stage；It has primarily served the effect of input sample and output sampling isolation, if isolation is not added, reality is proved
The transfer efficiency that DC/DC module can seriously be reduced, damages power supply.
The single-chip microcontroller 4 accepts the signal that isolating device 2 is transmitted through, and carries out over-voltage/under-voltage comparison, due to DC/DC power supply
Module is typically all wide range input close limit voltage output, therefore the upper and lower scope limitation compared can inputted
In the range of +/- the 20% of voltage value, alarm is just provided more than this range.
The effect of the display portion 5 is exactly to play the role of convenient for naked-eye observation, and the content of display can basis
Demand and set, whole size is made according to equipment volume.
6 main function of temperature sensor is the operating ambient temperature for monitoring power supply group.Digital temperature sensor is selected,
Digital signal can be thus directly transmitted to single-chip microcontroller 4, carry out temperature comparison inside it, the lower limit compared can choose n
Required operating ambient temperature is minimum in a power module 85% or so.
The control interface 7 is the transmission port of manual command, is common a switch or serial ports, thus can be with
The internal information of single-chip microcontroller 4 is passed on the control computer of whole system, the working condition of its power supply is monitored.
The isolated power supply 8 is low power DC/DC power module, gives input terminal AD converter 1, output terminals A D converter
3, single-chip microcontroller 4, display portion 5, control interface 7 and temperature sensor 6 are powered.Power protection control is ensured that in this way
Circuit is constantly in working condition, and is isolated with the primary power source of input.
The keyboard portion is mainly to control shortcut key when each function, inside connection single-chip microcontroller portion in outside
Point, the processing and calculating of signal are carried out after key by single-chip microcontroller 4.
Claims (1)
1. a kind of handheld portable precision strain gauge, comprising: TVS diode (0), input terminal AD converter (1), isolator
Part (2), output terminals A D converter (3), single-chip microcontroller (4), display portion (5), temperature sensor (6), control interface (7) and isolation
Power supply (8)；It is characterized in that, isolated power supply (8) is low power DC/DC isolated power supply module, input terminal AD converter is given
(1), output terminals A D converter (3), single-chip microcontroller (4), display portion (5), temperature sensor (6) and control interface (7) are supplied
Electricity；TVS diode (0), will moment after voltage is more than TVS diode (0) threshold value itself under normal conditions at high-impedance state
Conducting can generate a high-voltage impact in moment, TVS diode (0) is connected when additional power source is opened, public with input
End constitutes circuit altogether, and TVS diode (0) restores normal condition after impact；Input voltage passes through input terminal AD converter (1)
Carry out digital sample become digital signal through isolating device (2) be isolated then be input to again single-chip microcontroller (4) carry out over-voltage/owe
Pressure ratio compared with；Output voltage becomes digital signal through output terminals A D converter (3) progress digital sample and is directly inputted to single-chip microcontroller (4)
Carry out over-voltage/under-voltage comparison；The temperature of working environment is input to single-chip microcontroller (4) progress after obtaining data by temperature sensor (6)
Temperature compares；Single-chip microcontroller (4) shows final comparison result by display portion (5)；Display portion (5) display is compared
As a result, current environmental temperature and input/output voltage value；Single-chip microcontroller (4) generates the life whether closed according to comparison result
It enables and unified switch control is carried out to DC/DC isolated power supply module by isolating device (2)；External control command is connect by control
Mouthful (7) are input to single-chip microcontroller (4) and then manually control to power supply group, and control interface (7) as needed is by single-chip microcontroller (4)
Processing result is shown on computers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810779507.XA CN109141342A (en) | 2018-07-16 | 2018-07-16 | A kind of handheld portable precision strain gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810779507.XA CN109141342A (en) | 2018-07-16 | 2018-07-16 | A kind of handheld portable precision strain gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109141342A true CN109141342A (en) | 2019-01-04 |
Family
ID=64800666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810779507.XA Pending CN109141342A (en) | 2018-07-16 | 2018-07-16 | A kind of handheld portable precision strain gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109141342A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170253A (en) * | 2007-09-29 | 2008-04-30 | 哈尔滨工程大学 | Digital protection circuit for multiple DC/DC isolated power supplies |
| CN202712814U (en) * | 2012-05-16 | 2013-01-30 | 洛阳隆盛科技有限责任公司 | Shutdown output over-voltage and under-voltage protection circuit |
| CN205482905U (en) * | 2016-01-18 | 2016-08-17 | 西安远方航空技术发展总公司 | Portable strain sensor detector and system |
| CN206638208U (en) * | 2016-08-25 | 2017-11-14 | 陕西省地质环境监测总站 | A kind of hand-held Crack Monitoring instrument |
-
2018
- 2018-07-16 CN CN201810779507.XA patent/CN109141342A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101170253A (en) * | 2007-09-29 | 2008-04-30 | 哈尔滨工程大学 | Digital protection circuit for multiple DC/DC isolated power supplies |
| CN202712814U (en) * | 2012-05-16 | 2013-01-30 | 洛阳隆盛科技有限责任公司 | Shutdown output over-voltage and under-voltage protection circuit |
| CN205482905U (en) * | 2016-01-18 | 2016-08-17 | 西安远方航空技术发展总公司 | Portable strain sensor detector and system |
| CN206638208U (en) * | 2016-08-25 | 2017-11-14 | 陕西省地质环境监测总站 | A kind of hand-held Crack Monitoring instrument |
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Application publication date: 20190104 |
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| RJ01 | Rejection of invention patent application after publication |