日光温室温度传感器布置研究

通过对日光温室内部不同高度和不同水平面位置的温度传感器进行温度测量实验与分析,总结出日光温室在不同工况下的的温度分布情况,在植物生长区温度分布较均匀。建议在日光温室控制系统中,为了降低成本减少温度传感器的数量,可将一个温度传感器放在温室中间位置。     

基于单片机的昆虫热特性测量控制系统的设计

为了研究昆虫的热特性,以单片机、可控硅及DS18B20数字温度传感器为核心设计了一套昆虫热特性测量控制系统。其中,采用DS18B20数字温度传感器采样被检测的温度,以可控硅过零触发调功方式调节加热板的加热速率,分别用C语言和VB 6.0设计了相应的单片机程序和人机交互界面。该系统人机界面友好,能实时显示昆虫在加热过程中的温度并能绘制出温度随时间变化的曲线。     

多路温度单片机监控系统的研究

本文针对食品加工业中测量食品内部温度的特殊需要,研制成多路温度单片机监控系统。本系统采用单片机技术,选择针状温度传感器,实现多路温度的监控、超温报警及多种显示方式。该系统适用于食品加工、孵化室等温度监控。     

地市级移动气象计量检定系统温度传感器核查方法

现阶段,移动气象计量检定系统已广泛应用于地市级气象传感器日常核查工作中,温度传感器的核查是其中重要的组成部分.研究主要介绍温度核查装置的基本原理、操作流程和现场核查方法等内容,从而规范地市现场核查计量业务管理.     

实用多点测温系统及其在粮仓温度监测中的应用

本文介绍集成温度传感器ＡＤ５９０及由其构成的多点温度测量系统。进而给出了运用该系统设计粮仓温度监测系统的方案。     

温室多点温度测量及控制系统设计

介绍了以微处理器AT89S52为核心,通过多个温度传感器DS18820同时测量温室内不同区域温度,并对各区域温度进行分级控制的系统设计方案。     

花房温度及光照度控制电路的设计

鉴于现在国内科技水平的成果,本着节约成本、控制简单的原则,设计了花房的温度及光照度实时控制电路。利用先进的温度传感器、光照传感器测量温度和光照度,由单片机控制执行单元调节温度和光照度。给出了硬件的设计方案和软件的设计思路。花房温度高、光照度大时后自动放下遮阳网和开启风机,温度低、光照强度小时自动收起遮阳网和开大暖气阀门,使得花房内的温度和光照度控制在设定的范围之内。     

基于单片机的远程多点温度测量系统设计研究

提出了一款基于STC89C52单片机的远程多点测温系统,该系统以多个DB18B20温度传感器测量不同点温度,经单片机采集后,经RS485总线传到上位机显示与控制,实现了远程多点测温。     

家禽舍温度控制系统应用研究

设计了基于单片机的家禽舍温度自动控制系统,介绍了数字温度传感器的特点,阐述了该系统温度采集、温度显示、温度控制等硬件的设计思想,对软件模块提出详细设计方案。该系统测量精度高,性能稳定,操作简单方便,具有良好的应用前景。     

蜂巢温度全覆盖采集系统的设计与实现

为探索蜂巢内温度变化以及蜂巢恒温调控机理,设计了一种蜂巢温度采集系统。该系统由温度采集电路、嵌入式微处理器、Zigbee无线模块及上位机监测终端组成,其中温度传感器采集电路安放于2巢础间,微处理器及传输电路置于蜂箱外。采集电路以负温度系数热敏电阻作为温度传感器,微处理器控制多路切换开关、AD转换器,采用阵列式结构对巢脾各蜂房温度进行全覆盖检测、采集,采用Zigbee无线网络传输数据,利用C语言基于Visual Studio软件平台开发监测终端软件。试验表明:该系统在自然环境下运行稳定,105 s内可获取蜂巢单张巢脾2 880个蜂房温度数据,覆盖巢脾90%区域,获取温度数据与实际温度值误差小于0.5℃。     

Field performance in agricultural settings of a wireless temperature monitoring system based on a low-cost infrared sensor

Continuous measurement of plant canopy temperature is useful in both research and production agriculture settings. Industrial-quality infrared thermometers which are often used for measurement of canopy temperatures, while reliable, are not always cost effective. For this study a relatively low-cost, consumer-quality infrared thermometer was incorporated into a wireless monitoring system intended for use in plant physiological studies and in agricultural production settings. The field performance of this low-cost wireless system was compared to that of a typical research system based on an industrial-quality infrared thermometer. Performance was evaluated in terms of: reliability of data acquisition, quality of seasonal temperature measurements, seasonal stability of the consumer-quality infrared sensor, and the equivalence of temperatures measured by the consumer-quality and industrial-quality temperature sensors. Results indicate that for many common uses of plant temperature data, the two sensors provide functionally equivalent results. The cost savings and ease of use associated with the low-cost wireless temperature monitoring system present advantages over the higher-cost industrial-quality sensors which may make them a viable alternative in many agricultural settings.     

自动气象站设备维护与故障诊断处理

简要介绍了自动气象站的采集器、气压传感器、终端通讯、温湿传感器、风向风速传感器、地温传感器和雨量传感器维护,并对工作中出现自动气象站仪器故障时的诊断处理进行了描述.     

Nanotube molecular wires as chemical sensors

Chemical sensors based on individual single-walled carbon nanotubes (SWNTs) are demonstrated. Upon exposure to gaseous molecules such as NO(2) or NH(3), the electrical resistance of a semiconducting SWNT is found to dramatically increase or decrease. This serves as the basis for nanotube molecular sensors. The nanotube sensors exhibit a fast response and a substantially higher sensitivity than that of existing solid-state sensors at room temperature. Sensor reversibility is achieved by slow recovery under ambient conditions or by heating to high temperatures. The interactions between molecular species and SWNTs and the mechanisms of molecular sensing with nanotube molecular wires are investigated.     

灰树花菇房多点温湿度监测系统设计

【目的】设计灰树花菇房温湿度监测系统并对其进行多点监测.【方法】首先,根据灰树花菇房的结构,进行集成式温湿度传感器的多点布置,以采集温湿度实时数据.而后,借助于无线传输模块,将数据实时传输到温湿度实时监测下位机系统.最后,开发上位机监控软件实现对每个节点温湿度数据的实时存储、显示和查询.【结果】通过将传感器、无线传输、上位机等硬、软件系统的合理布局和设计,采集灰树花菇房多点温湿度数据,并进行实时传输和存储,实现对灰树花菇房温湿度进行有效地监测.【结论】根据该监测系统所测温湿度值与仿真计算的温湿度分布值对比分析,两者差异很小,验证所设计检测系统的可行性.     

Agricultural applications of a low-cost infrared thermometer

Plant canopy temperature is used in many studies of plant/environment interactions and non-contact measurement is often made with radiometric surface thermometers commonly referred to as infrared thermometers. Industrial-quality infrared thermocouples are widely available and often used in agricultural research. While research on canopy temperature has provided management tools for production agriculture, the high cost of the industrial-quality infrared thermocouples has limited their adoption and use in production agriculture settings. Our objective was to evaluate a low-cost consumer-quality infrared thermocouple as a component of a wireless thermal monitoring system designed for use in a production agriculture setting. The performances of industrial-quality and low-cost consumer-quality sensors were compared under controlled constant temperature and under field conditions using both grass and cotton canopies. Results demonstrate that under controlled constant-temperature the two types of infrared thermocouples were “significantly the same” at 10 °C, 20 °C and 30 °C and “significantly not the same” at 40 °C and 50 °C. Across the temperature range tested, the consumer-quality infrared thermocouples temperature reading was closer to the thermocouple reading than the industrial-quality infrared thermocouples. A field comparison of industrial-quality and consumer-quality infrared thermocouple sensors monitoring a grass canopy and a cotton canopy indicated that the two types of sensors were similar over a 13–35 °C range. The measurement of temperature made with two types of sensors would not differ significantly. Based on these results we conclude that the lower-cost consumer-quality infrared thermometers are suitable for use in production agricultural applications.     

管道流动实验装置的研制与调试

介绍了一种测试复杂流变体管流实验装置的研制情况，给出了专门标定该装置压力传感器，温度传感器，蠕动泵以及管路内径的方法。经过标定和调试的装置可以测试复杂流体的各种流变特性，同时可以模拟工业管道的各种工况。     

基于LabVIEW的农田自动灌溉系统的设计

综合利用计算机虚拟仪器技术、自动控制技术和现代农业技术,研究开发了基于LabVIEW的农田灌溉自动化控制系统。该系统通过设置在田间的各种传感器,实时获得农田的生态环境信息参数,并将信息参数传给计算机,计算机进行处理和分析,根据分析数据控制灌溉设备的起停和灌溉量,实现农田的自动灌溉。     

基于ZigBee无线传感器网络的海南省耕地监测管理系统

通过在海南省10个核心示范大田洋野外安装环境温湿度传感器、土壤温度水分传感器等,利用Zig Bee无线传输方式,构建了一个基于物联网的耕地远程实时监测系统。该系统基于已建立的海南耕地质量改良信息共享平台,实现了铺前镇、枫木镇、大路镇、东成镇等大田洋环境数据位置的地图显示,实现了耕地环境的空气温湿度、土壤温湿度、光照度、CO2等数据的实时采集,根据用户的需求可查询某一段时间的历史监测数据,为用户对无线传感器和野外耕地环境的数据监测提供了远程管理,提高了海南耕地环境的信息化管理水平。     

一种多点土壤电导率实时监测系统的研制

为获取建立溶质运移模型所需的土壤溶质浓度参数,根据土壤溶液电导率与溶液浓度c的线性关系,应用电流电压四端法,研制出一种多点土壤电导率实时监测系统。该系统硬件部分自行设计的四针微型探头可减小对溶质运移的扰动,且可高密度分布在土壤中;连接8路电导率探头和1路温度探头的高精度数据采集器DAB能够实现8通道土壤电导率测量及温度辅助测量,并可通过485总线接口实现系统规模的扩展。采用VC开发的监测显示平台能够完成采集器参数设置,数据采集、显示与存储功能。通过对采集器通道和探头的标定,有效解决了多点土壤电导率实时监测的一致性问题。标定试验结果表明,数据采集器8通道电导测量值与标准电导的相关系数为0.999 5,表明通道标定后有效提高了其测量准确度,减小了各通道测量差异;通道标定后采集器各通道测量的标准溶液电导G与其电导率σ具有良好的线性关系,但不同电导率条件下探头的测量结果存在较为明显的偏差,说明探头制作过程引起的结构差异不可忽略,进而采用分段标定方法对每一个探头的结构常数进行标定。     

A microcomputer-based system for feed control, temperature control and temperature recording in an experimental fish hatchery

An automatic feed delivery system and complementary temperature control and recording system designed to save labor and improve the efficiency of an experimental fish rearing facility is described. A microcomputer with a 6502 type microprocessor accepts an instruction array of feeding times and amounts, as well as upper and lower temperature limits for activation of an alarm and a heater, respectively. Feed is released by solenoid-actuated devices constructed from common materials and components. All other peripheral devices (real-time clock, disk drive input-output control and temperature sensors) are commercially available. The BASIC program for control of feeding and temperature is available upon request.