基于C8051F020的智能红外报警系统设计     

熊杰 《黄冈师范学院学报》2014,(3):47-49

以C8051f020单片机作为控制核心,采用热释电红外传感器模块DYP-ME003作为前端探测器,通过SPI协议模式对语音芯片ISD1700进行语音录放功能的精确操控,实现语音门铃录音、播放,报警声录音、播放等。若有人入侵,则通过单片机控制GSM模块按照设置好的号码及信息发送到主人的手机上,达到报警目的。测试结果表明,该系统能真实再现语音效果,运行稳定、可靠。  相似文献   

Light-induced color changes and chemical modification of treated and untreated chestnut wood surface     

none 《文物保护研究》2013,58(2):131-139

Abstract

The aim of this work is to study the surface modifications of chestnut (Castanea sativa Mill.) wood by reflectance spectrophotometry and Fourier transform infrared spectroscopy (FTIR) in order to understand the mechanisms that cause changes and to suggest possible solutions to avoid degradation phenomena. The experimental data were statistically treated to evaluate their significance. Concerning the surface protection of wood, starting from the results obtained by testing different commercial products, attention was focused on a novel organic preservative/consolidant product (Linfoil^®) that has attracted great interest in the field of conservation of wooden artifacts. Color monitoring showed that wood surface color undergoes an important variation due to photoirradiation, occurring within the first 24 hours and mainly due to L* decrease and b* increase. Though the protective treatment modifies wood color, nevertheless the product tested seems to protect the wood surface by reducing photoyellowing. FTIR analysis indicated that irradiation caused the degradation of lignin and increased the concentration of the chromophore groups on the wood surface. Changes in the chromaticity coordinates can be linked to the degradation of lignin and to increase of the concentration of carbonyl groups.  相似文献   

FTIR Measurement of Cellulose Microfibril Angle in Historic Scots Pine Wood and Its Use to Detect Fungal Decay     

Kate Hudson-McAulay  David Auty 《文物保护研究》2018,63(6):375-382

Microfibril angle (MFA) – the orientation of cellulose fibres in the S2 layer of the secondary cell wall – is a key determinant of the stiffness and strength of timber. The microfibril angle depends on the way in which the timber was grown and its position within the tree. Microfibril angle can be measured by X-ray diffraction and other methods, but the methods in current use are slow or require advanced instrumentation. The aim of this study was to explore the use of polarised Fourier transform infrared (FTIR) microscopy as a relatively fast and inexpensive method for measuring MFA in historic Scots pine (Pinus sylvestris L.). The FTIR measurements were calibrated against X-ray measurements of MFA in modern Scots pine. We observed a wide range in MFA values and a radial pattern of MFA similar to modern Scots pine in undecayed Scots pine heartwood from sixteenth and seventeenth century beams in Scottish secular buildings. The density of the heartwood was also similar to modern plantation-grown Scots pine despite the much slower growth rate recorded in the ring widths of the historic timber. The sapwood, which had been attacked by both insect pests and fungi, showed an erratic reduction in density and a large increase in MFA compared to the modern material. The increased sapwood MFA was attributed to selective destruction of the S2 layer of the wood cell walls by fungal decay. Using MFA measurements in conjunction with density offers the possibility to estimate the mechanical properties of sound historic pine timber, to detect fungal decay more sensitively than by density alone, and to distinguish between pest and fungal attack in a way that relates directly to the remaining mechanical performance of the timber.  相似文献   

光电探测系统的设计原理及应用   总被引：2，自引：0，他引：2  

朱立文 《鄂州大学学报》2003,10(4):52-55

该文根据“非典”时期红外测温仪的应用，讨论了光电系统的设计思想和基本原理及应用。  相似文献   

论二正（异）丙氧基-三嗪的合成     

唐皓李宪平  肖新初 《娄底师专学报》2005,(5):33-36

以三聚氯氰为起始原料合成了四种三嗪衍生物,并用红外光谱和质谱分析法对它们进行了表征.产品检测结果表明,四种三嗪衍生物有较高熔点,在常温下不易挥发.  相似文献   

快速检测熏硫银耳系统设计及实验教学应用     

王硕南  王永清  张欣  周颖昌 《教育教学论坛》2019,(7):73-74

银耳被硫磺熏蒸后能够防霉变、防虫蛀,并且鲜艳卖相好。但长期服用熏硫银耳会伤害身体。本项目开发了便携式可见-近红外光谱法快速检测硫熏银耳测试系统,通过对熏硫银耳样品的实验测试结果,得到熏硫银耳中残留的硫磺在715 nm和835 nm处存在明显吸收峰,说明银耳含有硫磺残留,实现了熏硫银耳中硫磺残留量的快速检测。有助于市场现场鉴别熏硫银耳,为加强市场管理提高了有效检测方法。将研究结果用于传感器等课程实验教学后,激发了学生的学习兴趣,有助于工科学生实践创新能力的培养。  相似文献   

电教设备中央控制系统的设计     

陈丹 《中国教育技术装备》2003,(3):12-15

阐述了为在一个综合控制平台上对各种多媒体设备及灯光、窗帘，摄像机的运作实行遥控，如何利用分布式单片机控制技术，PC机串行通信技术，红外二次调制编码遥控等技术，进行硬件，软件的设计，分析了它们的原理及实现手段。  相似文献   

智能小区管理系统设计     

梁保家  陈诗伟 《江西教育学院学报》2008,29(3):46-49

文章论述了一种采用低成本单片机为核心、基于TCP／IP协议的智能小区管理系统的设计方法,详细分析了系统的硬件模块组成和软件通讯实现方案,该系统实现了小区的网络化智能管理。  相似文献   

红外激光油位测量系统的研究     

李延廷 《临沂师范学院学报》2008,30(6):52-54

提出了一种利用红外激光进行油位测量的新方法及相应的实验室测量系统．重点介绍了系统的特点、组成及工作原理,并对系统的实际测量效果、存在的问题进行了简要的分析．  相似文献   

基于89C51的非接触式红外数字测温计的设计   总被引：1，自引：0，他引：1  

权建军 《兰州石化职业技术学院学报》2008,8(3):29-31

传统的温度测量方法基本上都是接触式测量,使用方面有很多局限。红外测温是目前最主要的非接触式测温方式之一,被广泛应用于各行各业。采用台湾凌阳公司的红外测温模块解决了传统测温中需接触的问题,并且具备回应速度快、测量精度高、测量范围广,以及可同时测量环境温度和目标温度的特点,配合MCS51单片机成为一个测量距离达30米的非接触式的温度测量计。  相似文献