CN203337299U - Resistance strain-type multi-channel high-accuracy force measurement system - Google Patents
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Abstract
Description
技术领域technical field
本实用新型属于传感器测力系统技术领域，涉及一种电阻应变式多路高精度测力系统，产品适用于对位移、力、压力等物理量的应变式多路高精度在线监测、桥梁受力产生的变形监测以及长时间野外压力测量与记录等方面。The utility model belongs to the technical field of sensor force measurement systems, and relates to a resistance strain type multi-channel high-precision force measurement system. Deformation monitoring and long-term field pressure measurement and recording.
背景技术Background technique
用电阻应变式传感器测力的方式因具有灵敏度高、体积小且能在恶劣环境下使用的优点，迄今已被广泛地使用在位移、力、压力、精确温度测量等物理量的测量中。对于利用金属应变体制作的传感器，由于常用电阻应变仪在线性测量范围中，相当于材料受力产生线性应变的最大值约为1/1000左右，常用传感器的灵敏度为2左右，也就是说当在供桥电压为5V时，受力引起的电压信号最大只有约5÷1000×2V=10mV，而常见A/D转换器的基准电压为3～5V，这就需要有一个放大倍数为100倍左右的低漂移、高精度放大电路，所以对测力电路的调理电路要求比较高。The method of measuring force with a resistance strain sensor has been widely used in the measurement of physical quantities such as displacement, force, pressure, and precise temperature measurement because of its advantages of high sensitivity, small size, and ability to be used in harsh environments. For sensors made of metal strain bodies, since the commonly used resistance strain gauges are in the linear measurement range, the maximum value of the linear strain caused by the force of the material is about 1/1000, and the sensitivity of the commonly used sensors is about 2, that is to say, when When the bridge supply voltage is 5V, the maximum voltage signal caused by force is only about 5÷1000×2V=10mV, while the reference voltage of common A/D converters is 3~5V, which requires an amplification factor of 100 times Left and right low-drift, high-precision amplifier circuits, so the requirements for the conditioning circuit of the force measuring circuit are relatively high.
又对于桥梁变形、矿山采掘受压变形相似模拟实验等应用场合来说，需要同时检测多达数十到几百路的压力信号，需要一台计算机监测多路压力信号，这就要求能有一个可同时监测多路压力信号的前端数据采集器。考虑现场的应用环境，前端机应包括信号变送调理电路在内就应具备体积小，通信接口连线简单的特点。Also, for applications such as bridge deformation, mine excavation compression deformation similar simulation experiments, etc., it is necessary to detect tens to hundreds of pressure signals at the same time, and a computer is required to monitor multiple pressure signals, which requires a A front-end data collector that can simultaneously monitor multiple pressure signals. Considering the on-site application environment, the front-end computer should have the characteristics of small size and simple communication interface connection, including the signal transmission and conditioning circuit.
此外，对于在野外或矿井中长期监测但没有通信链路的应用场合，需要将大量的分时测量数据进行记录和保存，这也要求采集器具备较大容量的具有掉电保护功能的数据存储器。In addition, for long-term monitoring applications in the field or in mines without communication links, it is necessary to record and save a large amount of time-sharing measurement data, which also requires the collector to have a large-capacity data memory with power-down protection function .
目前本领域尚没有完全适用于上述要求的测力系统,以往沿用的传感器测力设备相应还存在有硬件电路的结构复杂、运算速度和响应速度较低程序代码较多，需要占用CPU的软件运行资源以及不能实现多机通信和高速传输信息等问题。At present, there is no force measuring system fully suitable for the above requirements in this field. The sensor force measuring equipment used in the past still has complex structure of hardware circuit, low operation speed and response speed, and there are many program codes, which need to occupy CPU. Resources and the inability to realize multi-computer communication and high-speed information transmission.
实用新型内容Utility model content
本实用新型的目的在于对现有技术存在的问题加以解决，提供一种硬件电路结构简单、运算速度和响应速度块、不占用CPU的软件运行资源、可实现多机通信和高速传输信息的电阻应变式多路高精度测力系统，产品特别适用于对位移、力、压力等物理量的应变式多路高精度在线监测、桥梁受力产生的变形监测以及长时间野外压力测量与记录等方面的应用。The purpose of the utility model is to solve the problems existing in the prior art, and to provide a resistor with simple hardware circuit structure, fast operation speed and response speed, no occupation of CPU software operating resources, and the ability to realize multi-machine communication and high-speed information transmission Strain-type multi-channel high-precision force measurement system, the product is especially suitable for strain-type multi-channel high-precision online monitoring of displacement, force, pressure and other physical quantities, deformation monitoring of bridges caused by force, and long-term field pressure measurement and recording. application.
为实现上述发明目的而采用的技术解决方案是这样的：所提供的电阻应变式多路高精度测力系统具有单片机、智能应力测量与A/D转换电路、多路输入信号切换电路、应力传感器、AT45DB161存储器以及串行CAN转换电路，所说的单片机采用内置有A/D模拟输入和I2C多机通信接口的8051F410单片机，应力传感器的输出端依次经多路输入信号切换电路和智能应力测量与A/D转换电路后通至单片机的应力测量输入端，AT45DB161存储器的输出/输入端与单片机对应的输入/输出端联接,串行CAN转换电路的输出/输入端与单片机的CAN转换输入/输出端联接。The technical solution adopted in order to realize the purpose of the above invention is as follows: the resistance strain type multi-channel high-precision force measuring system provided has a single-chip microcomputer, an intelligent stress measurement and A/D conversion circuit, a multi-channel input signal switching circuit, and a stress sensor. , AT45DB161 memory and serial CAN conversion circuit, said single-chip microcomputer adopts 8051F410 single-chip microcomputer with built-in A/D analog input and I 2 C multi-computer communication interface, and the output terminal of the stress sensor passes through the multi-channel input signal switching circuit and the intelligent stress one by one. After the measurement and A/D conversion circuit, it is connected to the stress measurement input end of the single-chip microcomputer, the output/input end of the AT45DB161 memory is connected to the corresponding input/output end of the single-chip microcomputer, and the output/input end of the serial CAN conversion circuit is connected to the CAN conversion input of the single-chip microcomputer / output connection.
上述电阻应变式多路高精度测力系统中，所说的智能应力测量与A/D转换电路采用FS511模数转换器。In the above-mentioned multi-channel high-precision force measurement system of resistance strain type, the said intelligent stress measurement and A/D conversion circuit adopts FS511 analog-to-digital converter.
上述电阻应变式多路高精度测力系统中，所说的多路输入信号切换电路采用单8通道数字控制模拟电子开关CD4051。In the above resistance strain type multi-channel high-precision force measuring system, the multi-channel input signal switching circuit adopts a single 8-channel digital control analog electronic switch CD4051.
上述电阻应变式多路高精度测力系统中，所说的串行CAN转换电路为82C250转换电路，用于实现TTL与CAN信号的转换。In the above resistance strain type multi-channel high-precision force measuring system, the serial CAN conversion circuit is an 82C250 conversion circuit, which is used to realize the conversion of TTL and CAN signals.
在本实用新型所述系统内，8051F410单片机是一个8位CPU，它运行速度高，最高振荡频率可以达到50MHz，执行指令的机器周期与震荡周期相同，与现有的一些文献资料介绍的类似电路采用8051系列单片机制成的产品相比，使用相同的晶振频率，运算速度提高12倍，8051F410单片机内部有SPI和I2C串行数据接口，直接访问其特殊功能寄存器就可以进行快速串行通信，可以自动完成一个字节的数据传送，具有简化编程、减少占用CPU资源的优点。In the system described in the utility model, the 8051F410 single-chip microcomputer is an 8-bit CPU, which has a high operating speed and a maximum oscillation frequency of 50 MHz. The machine cycle of executing instructions is the same as the oscillation cycle, which is similar to the similar circuit introduced by some existing documents. Compared with the products made of 8051 series single-chip microcomputer, using the same crystal oscillator frequency, the operation speed is increased by 12 times. The 8051F410 single-chip microcomputer has SPI and I 2 C serial data interfaces inside, and direct access to its special function registers can perform fast serial communication. , can automatically complete a byte of data transmission, which has the advantages of simplifying programming and reducing CPU resource occupation.
该测力系统中采用的模数转换器FS511(智能应力测量与A/D转换电路)是台湾富晶半导体公司推出的一款高精度、低功耗模数转换器，其内核是一个18位精度的△-∑ADC，还集成有低噪声运算放大器、低通滤波器、数字滤波器，能对输入信号多次滤波，实现高精度A／D转换。该器件采用SPI总线与外部微处理器接口，通过内部的控制寄存器，用户可根据需要配置转换速率、极性、传感器电源控制等，从而得到不同的A／D转换频率、输出速率、A／D精度等。与微处理器接口采用SPI总线，经过设计者制作的实际电路试验验证：本系统采用该芯片1小时内的采样分辨率达到了18位，即20万分之一，实测使用量程为200kg的荷重传感器，分辨率达到了1g。利用该模数转换器芯片省略了高精度信号放大和基准电压电路，降低了对供桥电源精度的要求。The analog-to-digital converter FS511 (intelligent stress measurement and A/D conversion circuit) used in the force measurement system is a high-precision, low-power analog-to-digital converter launched by Taiwan Fujing Semiconductor Corporation. Its core is an 18-bit The high-precision △-∑ADC also integrates low-noise operational amplifiers, low-pass filters, and digital filters, which can filter the input signal multiple times to achieve high-precision A/D conversion. The device uses the SPI bus to interface with the external microprocessor. Through the internal control register, the user can configure the conversion rate, polarity, sensor power control, etc. according to the needs, so as to obtain different A/D conversion frequency, output rate, A/D precision etc. The interface with the microprocessor uses the SPI bus, which is verified by the actual circuit test made by the designer: the sampling resolution of this system within 1 hour using this chip reaches 18 bits, that is, one part of 200,000, and the actual measurement range is 200kg. The sensor has a resolution of 1g. The use of the analog-to-digital converter chip omits the high-precision signal amplification and reference voltage circuits, and reduces the requirement on the precision of the power supply for the bridge.
该测力系统中采用的AT45DB161存储器是一款具有串行SPI接口的非易失性存储器，它内部有2M字节的数据存储器，允许最高数据传送速率为30Mbps，内部数据存储是以页方式存储的，共有4096页，每页可以放置528个字节数据。使用时注意，每次快速按30Mbps的速率只能发送一页数据，等待3mS的数据保存后才能写下一页数据。擦除工作是按区进行，一个区有64K字节，也可以整片擦除，擦除整个芯片需要2秒的时间。The AT45DB161 memory used in the force measurement system is a non-volatile memory with a serial SPI interface. It has a 2M byte data memory inside, allowing the highest data transfer rate of 30Mbps. The internal data storage is stored in pages There are 4096 pages in total, and each page can hold 528 bytes of data. When using, please note that only one page of data can be sent at a rate of 30Mbps each time, and the next page of data can only be written after the data is saved for 3mS. The erasing work is carried out by area. One area has 64K bytes, and the entire chip can also be erased. It takes 2 seconds to erase the entire chip.
该测力系统的数据传输中使用了串行汽车总线CAN协议，串行CAN转换电路选用82C250，由于它允许的传输数字信号幅度为mV级，具有很好的抗干扰能力，它允许在一对传输总线上并联最多128个控制分机，并在传输距离达到10km的情况下，允许传输速率高达1Mbps，使得系统有很高的响应速度，可以实现远距离高速传输信息。The data transmission of the force measuring system uses the serial automobile bus CAN protocol, and the serial CAN conversion circuit uses 82C250. Because it allows the transmission of digital signal amplitudes of mV level, it has good anti-interference ability. It allows a pair of A maximum of 128 control extensions are connected in parallel on the transmission bus, and when the transmission distance reaches 10km, the transmission rate is allowed to be as high as 1Mbps, which makes the system have a high response speed and can realize long-distance high-speed transmission of information.
附图说明Description of drawings
图1是本实用新型的系统结构框图。Fig. 1 is a system structure diagram of the utility model.
具体实施方式Detailed ways
以下将结合附图对本实用新型内容做进一步说明，但本实用新型的实际制作结构并不仅限于下述的实施例。The content of the utility model will be further described below in conjunction with the accompanying drawings, but the actual production structure of the utility model is not limited to the following embodiments.
参见图1，本实用新型所述的电阻应变式多路高精度测力系统包括单片机1、数据存储器2、智能应力测量与A/D转换电路3、多路输入信号切换电路4、应力传感器5、AT45DB161存储器6、通信状态及其电源电压显示器7、按键指令输入器8、串行CAN转换电路9及稳压电源电路10。单片机1采用内置有A/D模拟输入和I2C多机通信接口的8051F410单片机，应力传感器5的输出端依次经多路输入信号切换电路4和智能应力测量与A/D转换电路3后通至8051F410单片机的应力测量输入端，AT45DB161存储器6的输出/输入端与8051F410单片机对应的输入/输出端联接,串行CAN转换电路9的I/O口与8051F410单片机的CAN转换I/O口联接。具体实施结构中，数据存储器2采用24C02，智能应力测量与A/D转换电路3采用FS511模数转换器，多路输入信号切换电路4采用单8通道数字控制模拟电子开关CD4051，行CAN转换电路9为82C250转换电路。Referring to Fig. 1, the resistance strain type multi-channel high-precision force measuring system described in the utility model includes a single-chip microcomputer 1, a data memory 2, an intelligent stress measurement and A/D conversion circuit 3, a multi-channel input signal switching circuit 4, and a stress sensor 5 , AT45DB161 memory 6, communication status and power supply voltage display 7, key command input device 8, serial CAN conversion circuit 9 and regulated power supply circuit 10. Single-chip microcomputer 1 adopts 8051F410 single-chip microcomputer with built-in A/D analog input and I 2 C multi-computer communication interface. To the stress measurement input end of the 8051F410 single-chip microcomputer, the output/input end of the AT45DB161 memory 6 is connected to the corresponding input/output end of the 8051F410 single-chip microcomputer, and the I/O port of the serial CAN conversion circuit 9 is connected to the CAN conversion I/O port of the 8051F410 single-chip microcomputer . In the specific implementation structure, data memory 2 adopts 24C02, intelligent stress measurement and A/D conversion circuit 3 adopts FS511 analog-to-digital converter, multi-channel input signal switching circuit 4 adopts single 8-channel digital control analog electronic switch CD4051, and CAN conversion circuit 9 is the 82C250 conversion circuit.
该电阻应变式多路高精度测力系统的基本技术要点将8051F410单片机用于多路高精度测力的控制核心，充分利用其内部资源串行SPI和I2C多机通信接口；使用8051F410单片机内部SPI与串行数据存储芯片接口，用来按设定的时间存储记录采集压力数据；使用多功能高精度、低漂移FS511模数转换器和多路输入信号切换电路CD4051，将8051F410与FS511用单片机内部SPI数据接口进行数据通信，用于压力传感器供桥电源的开关控制，用FS511内部的信号放大器进行信号的放大与调零，简化了采样与调信号理硬件电路，节省了材料，满足单片机能够准确测量模拟信号的需要，使用FS511内部的传感器电源控制功能可以使该实用技术适用于电池供电的场合。使用CAN串行物理接口及CAN串行数据总线来为系统提供通信链路，传输距离可以增加到10km，并允许最高速率达1Mbps，可以实现多机通信和高速传输信息；采用单片机内部I2C软件接口与24C02非易失性存储器传送数据，用于存放分机信息与传感器标定数据。The basic technical points of the resistance strain type multi-channel high-precision force measurement system use 8051F410 single-chip microcomputer as the control core of multi-channel high-precision force measurement, make full use of its internal resources serial SPI and I 2 C multi-computer communication interface; use 8051F410 single-chip microcomputer The internal SPI interface with the serial data storage chip is used to store, record and collect pressure data according to the set time; use the multi-functional high-precision, low-drift FS511 analog-to-digital converter and the multi-channel input signal switching circuit CD4051 to use the 8051F410 and FS511 The internal SPI data interface of the single-chip computer is used for data communication, which is used for the switch control of the bridge power supply of the pressure sensor. The signal amplifier inside the FS511 is used for signal amplification and zero adjustment, which simplifies the sampling and signal modulation hardware circuit, saves materials, and meets the requirements of the single-chip computer. To be able to accurately measure the needs of analog signals, using the sensor power control function inside the FS511 can make this practical technology suitable for battery-powered applications. CAN serial physical interface and CAN serial data bus are used to provide communication links for the system, the transmission distance can be increased to 10km, and the maximum rate is allowed to reach 1Mbps, which can realize multi-computer communication and high-speed transmission of information; use the internal I 2 C of the microcontroller The software interface transmits data with 24C02 non-volatile memory, which is used to store extension information and sensor calibration data.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104977116A (en) * | 2015-07-10 | 2015-10-14 | 四川奇胜科技有限公司 | Micro-differential voltage transmitter |
| CN105739377A (en) * | 2015-12-26 | 2016-07-06 | 惠州市蓝微新源技术有限公司 | Circuit for transmitting and receiving CAN data information by using common I/O ports of single-chip microcomputer and control method |
| CN107167269A (en) * | 2017-06-01 | 2017-09-15 | 陈畅 | A kind of strain-type electronic dynamometer |
| CN107478375A (en) * | 2017-07-24 | 2017-12-15 | 中国北方车辆研究所 | Bus type multichannel pressure acquisition sensing device |
| CN109855794A (en) * | 2018-12-09 | 2019-06-07 | 北京航天计量测试技术研究所 | A kind of pressure in-line calibration device based on the fusion of multi-communication protocol information |
| CN111504528A (en) * | 2020-05-11 | 2020-08-07 | 苏州博广远智能科技有限公司 | Multi-path force measuring module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104977116A (en) * | 2015-07-10 | 2015-10-14 | 四川奇胜科技有限公司 | Micro-differential voltage transmitter |
| CN105739377A (en) * | 2015-12-26 | 2016-07-06 | 惠州市蓝微新源技术有限公司 | Circuit for transmitting and receiving CAN data information by using common I/O ports of single-chip microcomputer and control method |
| CN105739377B (en) * | 2015-12-26 | 2017-03-29 | 惠州市蓝微新源技术有限公司 | Using the circuit and control method of the common I/O transmitting-receivings CAN data messages of single-chip microcomputer |
| CN107167269A (en) * | 2017-06-01 | 2017-09-15 | 陈畅 | A kind of strain-type electronic dynamometer |
| CN107478375A (en) * | 2017-07-24 | 2017-12-15 | 中国北方车辆研究所 | Bus type multichannel pressure acquisition sensing device |
| CN109855794A (en) * | 2018-12-09 | 2019-06-07 | 北京航天计量测试技术研究所 | A kind of pressure in-line calibration device based on the fusion of multi-communication protocol information |
| CN111504528A (en) * | 2020-05-11 | 2020-08-07 | 苏州博广远智能科技有限公司 | Multi-path force measuring module |
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