CN202255275U - Portable strain measuring instrument - Google Patents
Portable strain measuring instrument Download PDFInfo
- Publication number
- CN202255275U CN202255275U CN2011203942618U CN201120394261U CN202255275U CN 202255275 U CN202255275 U CN 202255275U CN 2011203942618 U CN2011203942618 U CN 2011203942618U CN 201120394261 U CN201120394261 U CN 201120394261U CN 202255275 U CN202255275 U CN 202255275U
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- strain gauge
- bridge
- core circuit
- portable
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- Expired - Lifetime
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 239000011888 foil Substances 0.000 claims description 16
- 230000009466 transformation Effects 0.000 claims description 6
- 230000011664 signaling Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 14
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 5
- 238000004891 communication Methods 0.000 abstract description 3
- 238000013500 data storage Methods 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
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Abstract
本实用新型涉及一种便携式应变测量仪，属于测量仪器仪表技术领域。便携式应变测量仪由机壳、核心电路板、液晶显示面板、按键键盘和电池组成，核心电路板又包含传感器恒流源供电电路、放大电路、AD转换芯片、数据存储器和微处理器，核心电路板上带有电源接口、液晶显示接口、键盘接口、测量信号接口和RS232接口，其中电源接口、信号接口和RS232接口共用一个DB9接口的9针插座。该便携式应变测量仪体积小、成本低、操作简单、使用方便、便于携带，集成了全桥、半桥和1/4桥切换功能，不需要外接补偿桥盒，将供电、通信和测量3种外部接口集成到了一组DB9接口上，减少了外部接口数量，增加了系统的集成度和可靠性，提高了设备的通用性。
The utility model relates to a portable strain gauge, which belongs to the technical field of measuring instruments. The portable strain gauge consists of a casing, a core circuit board, a liquid crystal display panel, a keypad and a battery. The core circuit board also contains a sensor constant current source power supply circuit, an amplifier circuit, an AD conversion chip, a data storage device and a microprocessor. The core circuit board is provided with a power interface, a liquid crystal display interface, a keyboard interface, a measurement signal interface and an RS232 interface, wherein the power interface, the signal interface and the RS232 interface share a 9-pin socket of a DB9 interface. The portable strain gauge is small in size, low in cost, simple in operation, easy to use and portable, and integrates full-bridge, half-bridge and 1/4-bridge switching functions, does not require an external compensation bridge box, and integrates three external interfaces of power supply, communication and measurement into a set of DB9 interfaces, thereby reducing the number of external interfaces, increasing the integration and reliability of the system, and improving the versatility of the equipment.
Description
Technical field
The utility model relates to a kind of portable strain gauge, belongs to the surveying instrument field of instrumentation technology.
Technical background
Strain gauge specifically is the deformation monitoring Displaying Meter that belongs to based on the foil gauge principle, carries out the instrument and equipment of automatic measurement to engineering safety, is widely used in strain security monitorings such as bridge, dam.
Existing strain gauge can satisfy certain practical applications demand, but has the deficiency of the following aspects:
1. mostly existing strain gauge is to place large-scale rack box, is unfavorable for outdoor portable measurement;
2. existing strain gauge all only has the full bridge measurement design, when measuring non-full-bridge foil gauge such as half-bridge, 1/4 bridge, all needs an external compensation bridge box, has increased portable burden;
3. existing strain gauge has used a plurality of interfaces in measurement, power supply, data transmission, and versatility is poor, and user's operation easier is bigger.
Summary of the invention
The purpose of the utility model is in order to overcome the deficiency of existing strain gauge, to propose a kind of portable strain gauge, being used to measure the strain value of foil gauge.
The utility model is realized through following technical scheme.
A kind of portable strain gauge of the utility model; Form by foil gauge, casing, core circuit plate, display panels, key board and battery; The core circuit plate comprises sensor constant current source power supply circuit, amplifying circuit, AD conversion chip, data-carrier store and microprocessor again; Have power interface, LCD interface, keyboard interface, measuring-signal interface and RS232 interface on the core circuit plate; Wherein power interface, signaling interface and RS232 interface are external interface, and 9 needle sockets of three shared DB9 interfaces of interface;
Above-mentioned core circuit plate, display panels, key board and battery all are positioned at casing; Above-mentioned battery is that core circuit plate, display panels provide power supply;
Above-mentioned constant current source is positioned on the core circuit plate, and the BG_V+ of 9 needle interfaces through the DB9 interface and AGND pin are that the outside foil gauge to be measured of casing provides power supply;
The signal that foil gauge produces is sent into amplifying circuit through the measuring-signal interface of core circuit plate; Signal after amplifying circuit amplifies is sent into the AD conversion chip and is carried out the AD conversion and the result is sent into microprocessor through iic bus; Microprocessor deposits the AD transformation result in data-carrier store, simultaneously the AD transformation result is carried out data scaling and calibrated result is sent into display panels through LCD interface showing;
The voltage signal at battery two ends carries out the AD conversion and the result is sent into microprocessor through iic bus through the AD conversion chip, can realize the monitoring to cell voltage;
The keyboard interface of microprocessor through the core circuit plate is connected with key board, and in order to the setting command that the reception key board is imported, the user is provided with the bridge type pattern of foil gauge to be measured through key board, and the bridge type pattern comprises three kinds on full-bridge, half-bridge and 1/4 bridge;
Microprocessor is communicated by letter with peripheral host computer through the RS232 interface, the AD transformation result is sent into host computer further handle;
Above-mentioned AD conversion chip works in single acquisition or continuous acquisition working method at the controller of microprocessor.
Beneficial effect
A kind of portable strain gauge of the utility model, volume is little, cost is low, simple to operate, easy to use, be easy to carry; Integrated full-bridge, half-bridge and 1/4 bridge handoff functionality do not need can accomplish the measurement to different bridge type foil gauges under the situation of external compensation bridge box; Can the simplified measurement operation through button setting, improve efficiency of measurement; Adopt single low power supply, increased the stability of electric power system; To supply power, communicate by letter and measure 3 kinds of external interfaces and be integrated on one group of DB9 interface, reduce external interface quantity, increase the integrated level and the reliability of system, improve the versatility of equipment.
Description of drawings
Fig. 1 is the schematic appearance of portable strain gauge;
Among Fig. 1,1 is casing, and 2 is key board, and 3 is 9 needle sockets, and 4 is display panels;
Fig. 2 is 9 needle socket wiring schematic diagrams of portable strain gauge;
Mode of connection when Fig. 3 is used for full bridge measurement for measuring instrument among the embodiment 1;
Mode of connection when Fig. 4 is used for half bridge measurement for measuring instrument among the embodiment 2;
Mode of connection when Fig. 5 measures for measuring instrument among the embodiment 3 is used for 1/4 bridge.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
A kind of portable strain gauge; Its profile is as shown in Figure 1, is made up of foil gauge, casing, core circuit plate, display panels, key board and battery, and the core circuit plate comprises amplifying circuit, AD conversion chip, data-carrier store and microprocessor again; Have power interface, LCD interface, keyboard interface, measuring-signal interface and RS232 interface on the core circuit plate; 9 needle sockets of power interface, signaling interface and the shared DB9 interface of RS232 interface wherein, the wiring schematic diagram of socket is as shown in Figure 2, among Fig. 2; 1 is the BG_V+ signal, is used for the sensor power supply; 2 is the PC_TXD signal, and 3 is the PC_RXD signal, and 2 and 3 all are used for serial communication; 4 is the AAGND signal, is used to connect foil gauge sensor mask line; 5 is the AGND signal, is used for power supply of strain-ga(u)ge transducer negative pole and serial communication; 6 is the BG_S+ signal, and 9 is the BG_S-signal, and 6 and 9 all are used for the strain-ga(u)ge transducer DATA REASONING; 7 is the BAT signal, and 8 is the PGND signal, and 7 and 8 all are used for external power charging;
Above-mentioned strain gauge adopts single 3.3V power supply, and its used powered battery voltage is 3.7V;
Above-mentioned AD conversion chip is 16 chips;
Core circuit plate, display panels, key board and battery all fixedly mount with casing in, foil gauge is positioned at outside and its signal of casing and sends into amplifying circuit through the measuring-signal interface of core circuit plate;
The casing size is 162 * 84 * 36mm.
Above-mentioned portable strain gauge is used for full bridge measurement; Its mode of connection is as shown in Figure 3; Earlier be set to the full-bridge mode of operation,, A, the C line of strain-ga(u)ge transducer be connected to 1,5 pin of 9 needle sockets through the sensor distribution through the button strainmeter; B, D lead end are connected to 6,9 pin; Portable strain gauge is to A, the C power supply of sensor, and the magnitude of voltage that the resistance change that B, D cause strain reflects is sent into the core circuit plate, through after amplification, AD conversion, the display process numerical value being shown on liquid crystal panel.
When above-mentioned portable strain gauge is used for half bridge measurement; Its mode of connection is as shown in Figure 4; Earlier strainmeter is placed the half-bridge mode of operation,, A, the C line of strain-ga(u)ge transducer is connected to 1,5 pin of 9 needle sockets through the sensor distribution through button; B is connected to 6 pin; Portable strain gauge is to A, the C power supply of sensor, and the magnitude of voltage that the resistance change that the D ' in B and the portable strain gauge internal compensation circuit causes strain reflects is sent into the core circuit plate, through after amplification, AD conversion, the display process numerical value being shown on liquid crystal panel.
When above-mentioned portable strain gauge is used for the measurement of 1/4 bridge; Its mode of connection is as shown in Figure 4, as the internal compensation part, through button strainmeter is placed 1/4 bridge mode of operation earlier in the frame of broken lines; Through the sensor distribution; The A lead end of strain-ga(u)ge transducer is connected to 1 pin of 9 adapters, and B is connected to 6 pin, the C ' power supply of portable strain gauge in A and portable strain gauge internal compensation circuit; The magnitude of voltage that the resistance change that D ' in B and the portable strain gauge internal compensation circuit causes strain reflects is sent into the core circuit plate, after system's process amplification, AD conversion, the display process numerical value is shown on liquid crystal panel.
Those skilled in the art; Under the situation of spirit that does not break away from the utility model and scope; Can also make various variations and modification, so all equivalent technical schemes also belong to category of the present invention, its scope of patent protection is to be limited the application's claims.
Claims (5)
1. portable strain gauge is characterized in that:
Form by foil gauge, casing, core circuit plate, display panels, key board and battery; The core circuit plate comprises amplifying circuit, AD conversion chip, data-carrier store and microprocessor again, has power interface, LCD interface, keyboard interface, measuring-signal interface and RS232 interface on the core circuit plate;
Above-mentioned core circuit plate, display panels, key board and battery all are positioned at casing, and foil gauge is positioned at the casing outside;
Above-mentioned battery is that core circuit plate, display panels provide power supply;
Above-mentioned constant current source is that the outside foil gauge of casing provides power supply through power interface;
The signal that foil gauge produces is sent into amplifying circuit through the measuring-signal interface of core circuit plate; Signal after amplifying circuit amplifies is sent into the AD conversion chip and is carried out the AD conversion and the result is sent into microprocessor through iic bus; Microprocessor deposits the AD transformation result in data-carrier store, simultaneously the AD transformation result is carried out data scaling and calibrated result is sent into display panels through LCD interface showing;
The voltage signal at battery two ends carries out the AD conversion and the result is sent into microprocessor through iic bus through the AD conversion chip;
The keyboard interface of microprocessor through the core circuit plate is connected with key board, and in order to the setting command that the reception key board is imported, the user is provided with the bridge type pattern of foil gauge to be measured through key board, and the bridge type pattern comprises three kinds on full-bridge, half-bridge and 1/4 bridge;
Microprocessor is communicated by letter with peripheral host computer through the RS232 interface, the AD transformation result is sent into host computer further handle.
2. a kind of portable strain gauge according to claim 1 is characterized in that:
Said power interface, signaling interface and RS232 interface are external interface, and 9 needle sockets of three shared DB9 interfaces of interface.
3. a kind of portable strain gauge according to claim 1 is characterized in that:
Said strain gauge adopts single 3.3V power supply.
4. a kind of portable strain gauge according to claim 3 is characterized in that:
Used powered battery voltage is 3.7V in the strain gauge.
5. a kind of portable strain gauge according to claim 1 is characterized in that:
Said AD conversion chip is 16 chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203942618U CN202255275U (en) | 2011-10-17 | 2011-10-17 | Portable strain measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203942618U CN202255275U (en) | 2011-10-17 | 2011-10-17 | Portable strain measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202255275U true CN202255275U (en) | 2012-05-30 |
Family
ID=46116504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203942618U Expired - Lifetime CN202255275U (en) | 2011-10-17 | 2011-10-17 | Portable strain measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202255275U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066947A (en) * | 2015-07-17 | 2015-11-18 | 路桥华祥国际工程有限公司 | Safety alarm device for cast-in-place concrete template steel pipe support |
| CN105716652A (en) * | 2014-12-03 | 2016-06-29 | 中国飞机强度研究所 | Detector circuit |
| CN111272136A (en) * | 2020-03-03 | 2020-06-12 | 上海澄测电子科技有限公司 | Portable strain signal data acquisition box |
-
2011
- 2011-10-17 CN CN2011203942618U patent/CN202255275U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716652A (en) * | 2014-12-03 | 2016-06-29 | 中国飞机强度研究所 | Detector circuit |
| CN105716652B (en) * | 2014-12-03 | 2018-01-16 | 中国飞机强度研究所 | A kind of detector circuit |
| CN105066947A (en) * | 2015-07-17 | 2015-11-18 | 路桥华祥国际工程有限公司 | Safety alarm device for cast-in-place concrete template steel pipe support |
| CN111272136A (en) * | 2020-03-03 | 2020-06-12 | 上海澄测电子科技有限公司 | Portable strain signal data acquisition box |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120530 |