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气敏元件性能检测装置的研究 总被引:1,自引:0,他引:1
为了促进气敏元件的研究与开发,本文介绍了一种气敏元件性能检测装置。该装置克服了以往气敏元件测试系统的结构复杂,操作繁琐等诸多不足,具有简单易行,功能齐备等优点,适用于气敏元件的参数测试及可靠性试验过程中的监测。 相似文献
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补偿式气敏元件的研究 总被引:2,自引:0,他引:2
提出了由n型气敏材料和p型气敏材料构成的补偿式气敏元件的原理及实现补偿的条件.据此原理制作了由γ-Fe_2O_3和LaFeO_3构成的补偿式元件.该元件有效地克服了乙醇的干扰,提高了对丁烷的选择性. 相似文献
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木文阐明了气敏元件性能参数特点,分析了现今普遍采用的基本测试电路之不足,提出了用恒流法测试气敏元件的设想。 相似文献
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ZnSnO_3-乙醇气敏元件特性及其可靠性研究 总被引:3,自引:0,他引:3
本文报导了ZnSnO_3气敏材料电导率随温度变化的测试结果.以它为基体材料制备乙醇气敏元件,对其电阻随乙醇气浓度变化的特性进行了讨论.元件的强制失效实验分析表明,该类元件在正常工作条件下,处于高浓度检测气体气氛中不发生“中毒”和失效;还给出了一些对生产工艺较有意义的数据. 相似文献
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为了提高卷烟制造过程中的控制精度与质量稳定性,设计实现了烟支物理参数的在线检测,所测得的烟支物理参数包括:重量、长度、圆周、圆度、密度、湿度、吸阻、通风率等。在设计方案中从系统架构的角度设计了系统硬件和软件,以及软硬选择的细节问题。本系统在湖南常德卷烟厂进行了实际的测试和应用,对于烟支各个物理参数检测所得数据在允许的误差范围内,从而实现了系统多参数测量的功能。 相似文献
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Monolithic sensor array based on a quartz microbalance transducer with enhanced sensitivity for monitoring agricultural emissions 总被引:2,自引:0,他引:2
A low-cost sensor array system for agricultural applications is presented. The sensor array is based on a quartz crystal microbalance (QMB) transducer with a novel heating structure. Selective host molecules are used as gas-sensitive layers. The gas-sensitive layers were optimized for the selective detection of ammonia at varying humidity concentrations. A mode of operation is presented which allows on-line monitoring of ammonia without a reference gas (RG). In addition, this temperature modulation (TM) mode improves the signal-to-noise ratio of the sensors compared to the usually applied RG mode. Multivariate regression models are applied on the sensor array data to selectively predict the ammonia concentration in agricultural emissions. 相似文献
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In order to determine the correlation between the gas-sensitive properties of the thermocatalytic gas sensor (TGS) and the porous structure of the carrier, two types of carriers have been investigated. Their sorptional parameters at different calcination temperatures have been studied. The parameters of the porous structure and the gas-sensitive properties of the TGS are characterized by measurements of benzene vapour adsorption and methane oxidation using methane/air mixtures, respectively. The obtained data indicate that the sensitivity of the TGS is related in some way with the structural parameters of the carrier (pore size and diameter distribution). Carriers must have a sorption capacity no less than 0.30 cm3 g−1, surface area of 100–140 m2 g−1 and possess biporous pore-volume size distribution. 相似文献
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火警系统是飞机上关系飞行安全的极其重要的设备之一,由于设计和使用环境等各方面的原因,火警系统可靠性差,尤其是虚警率较高,因此研制了飞机火警系统测试设备,它是一套数字采集式多参数智能综合测试系统;该设备以嵌入式工控机为核心,采用单元积木式结构,软件采用C语言编程,以Windows NT作为操作平台,用来管理整个系统的软、硬件资源;该智能综合测试设备具有可靠性高、通用性好,使用、操作简便直观,测试过程程序化、自动化,对测试环境的适应能力强等优点;经使用,该设备功能齐全,技术先进,性能优越,对保证飞行安全具有十分重要的意义。 相似文献
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A neural network-based approach for dynamic quality prediction in a plastic injection molding process 总被引:9,自引:1,他引:8
Wen-Chin Chen Pei-Hao Tai Min-Wen Wang Wei-Jaw Deng Chen-Tai Chen 《Expert systems with applications》2008,35(3):843-849
This paper presents an innovative neural network-based quality prediction system for a plastic injection molding process. A self-organizing map plus a back-propagation neural network (SOM-BPNN) model is proposed for creating a dynamic quality predictor. Three SOM-based dynamic extraction parameters with six manufacturing process parameters and one level of product quality were dedicated to training and testing the proposed system. In addition, Taguchi’s parameter design method was also applied to enhance the neural network performance. For comparison, an additional back-propagation neural network (BPNN) model was constructed for which six process parameters were used for training and testing. The training and testing data for the two models respectively consisted of 120 and 40 samples. Experimental results showed that such a SOM-BPNN-based model can accurately predict the product quality (weight) and can likely be used for various practical applications. 相似文献