Design of Experimental System of USB Data Acquisition Card-based Temperature Acquisition

In order to design a more efficient and more convenient temperature acquisition system, an approach combining USB data acquisition card with K type thermocouple temperature sensor is proposed under the circumstance of LabVIEW 2012 programming software. Firstly, the LabVIEW 2012 programming software is used to complete a temperature acquisition control program. Secondly, K type thermocouple temperature sensor is employed to transfer the temperature information. Thirdly, Then the USB data acquisition card can collect the voltage of K type thermocouple temperature sensor and convert it to a temperature scale. And, the simplification of experimental procedure can reduce the cost of development greatly. Finally, the experimental results illustrate that the range of measurement temperature is more wide and the temperature scale is more accurate.

Design of RTD temperature acquisition module based on ADuCM361

Aiming at acquiring and processing requirements of temperature sensor signal on the industrial control spot, it designs a RTD module based on ADuCM361 microprocessor. It integrates two types of processors including A -Y ADC with 24 bites high precision and ARM Cortex -M3 kernel with 32bites. Besides, it designs the hardware circuit and software flowchart of RTD temperature acquisition module. Programming practice proves that the model has many advantages concluding simple construction, strong practicability, low cost, wide measuring range, high precision, high reliability and so on.

Design of multi-channel data acquisition system based on LabVIEW and NI PXI-5105

A data acquisition system based on LabVIEW and NI PXI-5105 is presented for multi-channel data acquisition. It can realize the functions of parameter setting, data acquisition and storage, waveform display and data analysis using LabVIEW and NI-SCOPE device driver. The advantages of the system are that the setting is convenient, the operation is easy, the interface is friendly and the functions are practical. The experiment results show that the system has good stability and high reliability and is a powerful tool for multi-channel data acquisition.

Design and Implementation of a High-Speed Multi-Channel Data Acquisition System

A data acquisition system （DAS） to implement high-speed, real-time and multi-channel data acquisition and store is presented. The control of the system is implemented by the combination of complex programable logic device （CPLD） and digital signal processing （DSP）, the bulk buffer of the system is implemented by the combination of CPLD, DSP, and synchronous dynamic random access memory （SDRAM）, and the data transfer is implemented by the combination of DSP, first in first out （FIFO）, universal serial bus （USB） and USB hub. The system could not only work independently in single-channel mode, but also implement high-speed real-time multi-channel data acquisition system （MCDAS） by the combination of multiple single-channels. The sampling rate and data storage capacity of each channel could reach up to 100 million sampiing per second and 256 MB respectively.

Multi-channel & high-precision data acquisition devi ce for aerospace

This paper describes the detailed desi gn of data acquisition device with multi-channel and high-precision for aerosp ace.Based on detailed analysis of the advantages and disadvantages of tw o common acquisition circuits,the design factors of acquisition device focus o n accuracy,sampling rate,hardware overhead and design space.The me chanical structure of the system is divided into different card layers according to different functions and the structure has the characteristics of high reliability,conveni ence to install and scalability.To ens ure reliable operation mode,the interface uses the optocoupler isolated from th e e xternal circuit.The transmission of signal is decided by the current in the cur rent loop that consists of optocouplers between acquisition device and t est bench.In multi-channel switching circuit,by establ ishing analog multiplexer model,the selection principles of circuit modes are given.

Data Processing and Acquisition System for the HT-7 Multipulse Thomson Scattering Diagnostic

This article describes the data processing and acquisition system for the HT-7 mul-tipulse Thomson scattering diagnostic. An eight-pulse laser is used in the Thomson scattering system to obtain electron temperature profiles at eight different times throughout an entire plasma discharge. The major components of the diagnostic system consist of a multipulse Nd-glass laser, a photodetector's subsystem, a calibration set and a CAMAC data processing and acquisition system. The data processing software along with LeCroy 2250L will perform the data acquisition. In order to simplify the operation and extend the capability of its compatibility with other math softwares, the processing software has been improved by the authors. The new software based on the VC++ easily utilizes some math softwares to calculate the electron temperature. The new software is simpler and more operational than the old one.

基于FPGA的多通道温度采编装置设计

针对飞行试验中对设备温度测量的需求,设计了一种适用于飞行测试的高精度多通道温度采编装置。设计以FPGA构建信号采集处理系统,采用AD8227和AD590来实现信号的调理和温度冷端补偿,通过标准RS422协议实现16路温度信号传输,并采取线性拟合的方式对输出进行非线性校正,提高了系统准确率和稳定性。测试结果表明,测温电路全量程内最大测量误差为±0.083%F.S.。经过测试验证,该方案传输过程无丢帧零误码,系统运行高效、可靠。

面向STM32单片机的智能温度监测报警系统

为了实现对温度的无人化监测,作者设计了面向STM32单片机的智能温度监测报警系统。该系统采用STM32F103为主控制芯片,通过配合使用DHT11温湿度复合型传感器来监测房间内的温度,当被测室内温度高于或低于预先设置的温度时,LCD1602显示屏以及LED警示灯会向工作人员传递温度异常等相关信息。该系统实现了室内温度的智能化监测,具有成本低、操作简单等特点,具有较强的使用价值。

无绝缘轨道电路室外监测产品设计优化研究

介绍无绝缘轨道电路室外监测设备温度采集功能的设计优化方案。通过对产品的型式试验,分析温度传感器采用集中式安装方式时,影响温度采集速度的因素。通过优化温度传感器的安装方式,解决温度采集响应慢的问题,并通过试验进行验证。

电力电缆接头温度异常故障远程在线监测系统设计

电力电缆接头温度异常故障是影响系统运行的重要因素,以人工为主的检测方式存在较大缺陷,研究提出一种电力电缆接头温度异常故障远程在线监测系统。在硬件设计中,利用DSP和FPGA双重芯片,采集并解析电力电缆接头温度信号数据;选择双频通信监测模块,处理电缆接头的温度信号。在软件设计中,设计电缆接头温度信号采集算法和接收端信号数据处理方法;通过测量电缆外缘表面温度,实现电缆温度异常故障在线监测。系统完成对4组状态的电缆接头检测,当相对湿度为95%Rh、电压为110 V时,均能通过电缆接头的温度变化,对应接头的异常温度故障状态,具有实际应用效果。

高温地层对传感器采集钻井液参数的影响及解决方法

钻井液的流变参数优化设计对于整个项目的安全,保证钻井的高效优质有非常重要的意义,国内外目前并没有形成系统科学、定性定量的钻井液参数采集模式。考虑到钻井液的密度和电导率会随着温度的变化产生线性变化,温度过高会使采集参数的传感器的元器件造成形变,形变致使传感器发出参数变化,排除钻井液本体性能变化因素。分析了背景环境及影响因素,结合测试验证展开叙述,充分研讨了高温地层对传感器采集钻井液参数的影响及解决方法,希望能够为该领域的技术发展和工程建设提供有效的参考。

基于国民技术MCU全国产测温模块设计

设计一种基于全国产化器件的热电阻测量模块,采用国民技术MCU作为处理器,瑞盟科技MS5194T作为测温芯片,使用CA-IS3742HW隔离,模块可热拔插,采用多路全双工串行422实现与其他模块间的数据交互,通过MCU的GPIO引脚连接到通信芯片使能信号来控制模块的发送,避免其他模块接收到不正确的数据。分析了二线接法、三线接法和四线接法方式以及误差,提出激励电流交换通道同时测量REF电阻两端电压并采用同一参考电压来测量热电阻的方法,通过高低温试验验证了其可行性和准确性。该模块全部基于全国产化元器件,保证了芯片供应链安全。

铁路货车轴温实时监测系统中采集处理与MVBC编解码功能的设计及验证

为保障列车运行安全,该文对铁路货车轴温实时监测系统进行设计与验证,在采集通道接口防护基础上实现温度信号的通道选择、滤波、AD转换和电绝缘等功能,保障数据采集的可靠性。为解决温度测量和传感器的故障检测问题,该研究对模拟输入子系统和信号处理子系统进行深入设计,从而实现铁路货车轴温监测设备的数据采集和处理功能,并利用FPGA设计完成多功能车辆总线控制器MVBC编解码模块。最后,通过对温度信号处理子系统、MVBC总线控制器编解码模块的系统进行验证,达到预期效果。

基于CKS32系列MCU和LoRa的电机温度采集装置

针对目前电机温度监测存在的不足,提出了1种基于CKS32系列MCU和LoRa的电机温度无线采集装置。装置采用的LoRa无线传输方式能有效解决有线传输存在的布线困难,以及ZigBee、WiFi等无线传输方式存在的通信距离短、功耗高和通信成本高等问题。为了得到精确的温度值,该装置的软件采用最小二乘分段线性拟合方法进行计算,仿真结果表明,最大误差温度仅为0.18℃。实际测试结果表明,该测温方法具有占用内存小、计算速度快、测温精准等优势。同时,装置的最远通信距离能达到2.5km,电池工作寿命能达到784d,具有通信距离远、功耗低等优点,有较好的应用价值。

基于LabVIEW的温度采集系统设计

文章针对日常生活中温度这一基本环境参数,设计并开发了一套基于LabVIEW的温度采集系统。该系统利用温度传感器DS18B20进行温度数据采集,采用LabVIEW上位机软件实现温度显示、数据分析处理与存储等功能。该系统有适应性较强、液晶显示等优点,具有温度信息实时监控、响应速度快、温度检测范围为-55~125℃等特点。

高数采温度记录器功耗测试及分析

为实现对温度数据的完整采集,用于快速升降温设备(如快速核酸检测仪温度校准的无线温度记录器)通常需具备高采样频率。本文采用两种方法,对该类高速采温度记录器的功耗进行的测试和分析。同时,为更好地满足快速升降温设备的现场校准需求,对低功耗设计的无线温度记录器可兼顾高采样频率和低功耗进行了验证。

基于STM32的智能土壤温度测量仪设计

针对目前地面气象观测系统中的地温分采集器技术体制落后、通信手段单一、维护不便等问题,设计了一款基于STM32高性能处理芯片的智能土壤温度测量仪。通过构建要素数据采集、数据质量控制及组包传输等功能模块,测量仪能实现不同梯度土温、草温等要素数据的实时获取,同时利用Wi-Fi、RS232、RS485等多种通信方式将报文传输至上位机软件进行数据监测及产品加工。利用地温分采集器与测量仪的运行数据进行对比分析,初步验证了测量仪采集数据的准确度。实际应用效果表明,该测量仪具备运行稳定可靠、测量精度高、传输时效高等优点,能较好地满足地面气象观测需求。

Multi-channel retarding field analyzer for EAST

A multi-channel retarding field analyzer（MC-RFA） including two RFA modules and two Langmuir probes to measure the ion and electron temperature profiles within the scrape-off layer was developed for investigations of the interplay between magnetic topology and plasma transport at the plasma boundary.The MC-RFA probe for the stellarator W7-X and first measurements at the tokamak EAST was designed.The probe head allows simultaneous multichannel ion temperature as well as for electron temperature measurements.The usability for radial correlation measurements of the measured ion currents is also given.

ZYNQ7020的超声阵列测温系统设计

设计了一种基于ZYNQ7020的超声阵列测温系统,实现对尾焰温度的实时、精确检测。本设计以基于ZYNQ7020的8通道数据采集卡作为中控系统,搭配A/D芯片、放大滤波电路、功率放大电路完成对原始数据的采集。利用并行化多通道A/D数据采集系统设计了并行化收发时序,在ZYNQ中集成了Linux系统,设计DMA内核驱动程序,将采集到的回波数据上传至上位机。利用信号调制及互相关算法、最小二乘法在上位机进行二维温度场的信息重建并获得相应的温度场图像。经过测试,设计的超声测温系统可以有效获取回波信号并对其进行算法处理,完成对二维温度场的重建。

热渐进成形中加热方式及其测温方法的研究进展

渐进成形是一种先进的制造技术,可满足小批量产品高精高效的生产需求。在航天航空、电子及精密仪器领域中的部件通常具有轻质高强的特点,但在室温下整体延展性较差的材料(钛合金、镁合金、铝合金)很难通过传统的渐进成形方法来成形,使用热辅助方法就显得尤为重要。简要介绍了渐进成形技术的发展及成形原理,并综述了国内外研究学者在热渐进成形技术中使用的加热方法,将其分为两种类型:整体加热和局部加热,进一步对比分析了两种加热方式的优缺点,其中,电加热方式适用范围较广且加热温度较高,加之其设备结构简单,具有较大的应用前景。在此基础上,针对不同加热方式,综述了相应的成形装置及温度测控方式,测温方式分为接触式测温和非接触式测温。对比两种测量方法,接触式测温精度高且测温范围较大,但难以测量运动中物体的温度;非接触式测温通常用于测量运动中的物体和小范围内的温度,并且不会对被测物体的温度场造成影响,但其制造成本较高且测量精度相对较低。分析了各种成形装置及温度测控系统的适应工况,将温度控制在材料成形的最佳温度附近可以提高材料的成形性和成形精度。