Abstract:The carrier-catalytic organ is a common apparatus of checking the gas concentration in mine. It has high sensitivity,good linearity and can accurately check the concentration of gas. In order to anti-H2S. We improve some of anti-poisoning methods in being used, increaasing the anti-poisoning faculty obviously.

Abstract:We introduce a method to combine the technology of fiber sensor with the tradition infrared moisture detector, and design a kind of fiber bundle sensor to carry out the transmitting signal and receiving signal. We use the principle of lock - in amplifier to amplify the weak singal and send it to A/ D conversion properly. Under the condition of fitting for every quality target, we make the entire system more simpler and cheaper.

Abstract:The synthesis and characterization of the Pt nanoparticle catalyst for oxygen electrochemi- cal reduction have been studied in this paper. The catalyst was characterized by AFM, XRD and SEM. Electrochemical behavior of the oxygen reduction on the prepared electrode was investigated. A linear relationship between the limiting current and the concentration of O2 is obtained and the sensitivity is 381 nA ppm-1 when the O2 concentration is in the range 7 to 5010ppm.

Abstract:采用溶胶-凝胶法合成NASICON固体电解质材料,并以其为基体材料制作管式SO2传感器,敏感电极采用Na2SO3-30?SO4或者Na2SO4-30?SO4(摩尔比)复合硫酸盐.SO2浓度在(10～100)×10-6体积分数范围内,两种器件的灵敏度分别为81.1和60.6mV/decade.敏感电极为Na2SO3-30?SO4的元件响应和恢复时间分别为28.2 s和57.7 s;敏感电极为Na2SO4-30?SO4的元件响应和恢复时间分别为39.8 s和67.4 s.

Abstract:Pure ZnO and doped-ZnO with Sb nanoparticles, are prepared by chemical coprecipitation. X- ray diffraction(XRD) results indicates that the wurtzite structure of ZnO is formed while the amount of antimony is less than 5wt%. According to the test results of gas sensitivity and conductivity of ZnO and Sb doped-ZnO sensors , it is found that the sensitivity was influenced greatly by different sintering condition and is improved by doping the Sb,the conductive apex of Sb doped ZnO is disappeared. The result of XPS and the defect of sample can explain the changes in conductivity and gas sensitivity .

Abstract:The optimum film thickness l* and optimum grain size r0* for sensitivity in nano metal oxide gas sensing thin film are existent, and the value is dependent on the material and technics. The existence of optimum grain size is a new kind of mesoscopic effect, which is from the disability of Fermi statistics for negative oxide ions when the grain size reduced to a certain extent, according to the modification of Kubo theory for the grains keeping neuter to fermi statistics when the grain size reduced to character length rm , we get that r0* =2rm, and the values of rm and optimum grain size r0* are estimated with the word function in Kubo theory.

Abstract:From the formula of reaction exothermic rate, the differential equation of C(t) in the closed chamber test is given. From the solution of C(t), it shows that the closed tested chamber is a very slowly precess in concentration attenuation and the error caused by C can be ignored.

Abstract:The moisture measurement of undissolved solid, grease and gas is studied based on the principle of Karl - Fishcher coulometry, which cannot be conducted directly by CA - 06 moisture equipment. Through online of carrier gas, evaporating apparatus and host machine of moisture detector, a moisture detecting system of solid, grease and gas is constructed. The application of CA - 06 moisture equipment has been successfully expensed. The moisture measurement has good repeatability and reliable analytic results as well as high degree of accuracy. Experimental studies on foam materials, fumed silica, polyurethane foam and silicone as well as higher pure hydrogen are conducted by this technique and excellent measurement results are obtained.

Abstract:在快中子反应堆的气体回路上,用露点仪测量了快堆几个覆盖气体系统氩气中杂质水分的含量.测量时,通过将露点仪的探头从干燥器中拔出,使露点仪的本底升高1～5μL/L后再进行测量,可以较快地得到测量结果,对于测量水分含量小于15μL/L的氩气,这是方便、可行的方法.

Abstract:Have tested the resistance of the humidity-sensitive material ZnCr2O4-V2O5-LiO-ZnO in different gas surroundings, such as hydrogen, carbon dioxide, coal gas and ethanol (steam). It indicates that the resistance is independent of the gas, however the temperature affects the resistance obviously.

Abstract:以溶胶-凝胶法(Sol-gel)制备纳米SnO2及其不同比例的铜源掺杂物.采用热分析(TG-DTA),XRD等手段对其产物进行表征,利用静态配气法测试了掺杂产物的气敏性能.实验结果表明:采用Sol-gel法制备掺杂SnO2的气敏性能,同时受铜源和掺杂量的影响,且掺杂产物对乙醇不很敏感,但在150℃工作温度下对0.005%的H2S具有36367倍的高灵敏度.

Abstract:The installation and principle of the test room maintaining a low dew point temperature u-sing the tape 5A molecular sieves in the long-term are discussed. The method and result for test stability with a long-term using for a sensors are introduced.

Abstract:Poly(4-vinylpyridine) (P4VP)can graft onto nanosized carbon black(CB)to obtain a composite, which was quaternized and crosslinked with bromobutane and 1,4-dibromobutane to prepare resistive-type humidity sensitive material. The investigations on its humidity responses revealed that it exhibits high conductivity even at very low humidity, and both ionic and electronic conduction contributed to its conductivity. The content of CB,quaternization and crosslinking reaction of PVP greatly affect the relative contributions of the two types of conduction, thus modulating the humidity sensitive properties of the composite. Under optimized conditions, the composite exhibits a very wide sensing range of 0-98% RH.

Abstract:The WO3 based gas sensor is based on hall effect. The semiconductor material has selective adsorption to the gas that changes the electronic concentration which also raises hall coefficient , corresponding changes in the export of hall electromotive force. The experimental results show that the outputed voltage is from several millivolt to hundreds of millivolt and alters when the tensity of NO2 changed. The conclution is that this gas sensor based hall effect is a prospective gas sensor of new type.

Abstract:The WO3 powder is prepared by sol-gel method, whose microstructure is analyzed by u sing SEM and TEM, and the WO3-based trimethylamine(TMA) gas sensor doped with Pd is made for detecting the fish freshness. Both Its minimum detection concentration and work-temperature are low, and its sensitivity, selectivity and stability are all excellent.

Abstract:The developed chlorine gas sensor based on controlled potential electrolysis has PTFE multi-hole hating-water membrane and diffusion electrode which be made ultramicroparticle gold power by pressured compostite method. The working principle of this sensor is expressed. The results of measurement are discussed and analysed.

Abstract:The WO3 nanometer material can be prepared by sol-gel and improved sol-gel. We use it to make the direct-heating type gas sensor,and carry on the test to the low density NO2 gas. The result indicates that the WO3 material prepared by improved sol-gel has a very small particle size, its surface is loose,and it has very good sensitivities to low concentration even extremely low concentration NO2 gas. The element responds and resumes very quickly and has good selectivity. All elements have supreme sensitivity under lower working voltage, which means that the working temperature is relatively low. It helps to reduce the power consumption.

Abstract:In the paper, theory and application of solid electrolyte is recounted in detail. Electric theory of ZrO2 solid electrolyte and adulterate alter character are described. Development direction of new type sensor is discussed.

Abstract:Starting from the function requirement of the device, the design rule of polymer humidity sensor is briefly presented. The humidity sensitive mechanism, structure of the device, process and design method on humidity sensitive polymer are recounted. Moreover is illustrated with apply examples.

Abstract:The preparation of gas sensitive organ by using SnO2 is a kind of sensitive material, casting a layer consisted of Fe2O3 and MnO2 or active alumina impured with CuO on the surface of organ. This kind of organ could effectively isolate and remove the interfere of ethanol, smog, organ's gas and other mixed gas.

Abstract:甲烷气体通常需要在较高的工作温度下工作,要达到这个工作温度区间,元件体电阻越大,功耗也就越大;要降低功耗,就要降低元件体电阻.本文所述元件是在SnO2敏感膜材料中掺入Pd,Sb2O3,Al2O3等添加剂,制成微珠式元件,从而大大降低了元件的体电阻,设计出一种低功耗CH4气敏元件.此种元件在低于150 mW的加热功率下,在5000×10-6的CH4气氛中灵敏度可达到3以上,响应时间小于10 s,且具有良好的选择性和稳定性.

Abstract:ZnO thin film gas sensors having better gas sensing characters and better stability have been got on Al2O3 substrat by powder sputtering, so the practicality of ZnO thin film has been a chieved, it shows that ZnO is a new kinds of gas sensing basic materials besides SnO2. This work has also shows the law of the dependence of gas sensing current IG on alcohol concentration C.

Abstract:载体催化元件是最为常用的矿下瓦斯浓度检测器件,它灵敏度较高,线性度好,可精确地检测瓦斯浓度.为了克服其容易H2S中毒的缺点,采用并改进了现有的防中毒方法,明显地提高了元件的抗中毒能力.

Abstract:The technics of two kinds of thin film gas sensors made by powder sputtering are introduced. The structure and the experimental results of basic parameters are given in this paper.

Abstract:给出了SnO2/10?O2(0.4mm×0.6mm×0.4mm)元件的温耗特性曲线,研究了老化的温度和时间,研究了气敏电流Ig与气体浓度C的关系,并给出了一个普遍适用的规律.

Abstract:The principle and development of a multi-way permeation tubes generator are introduced. The selection of permeation tube, the method of selecting fitting permeation tube and the structure of this device are described in detail. According to the validation in measurement, it is proved that the device has well accuracy and reliability in running.

Abstract:The control system for Swsy-A type of two-pressure humidity generator used for humidity sensor calibration is introduced in this paper. Its technical performance and test result are elaborated. The main technical specifications and their solutions are also discussed.

Abstract:The necessity and gist of the revision of verification regulation of mechanical thermo-hy grometers is illustrated in the paper.

Abstract:Chilled-mirror dew-point hygrometers are widely used as humidity transfer standards. This paper discusses our method to evaluate the uncertainty components of chilled mirror hygrometer during calibration process, and also a few possible influencing factors we are interested in .

Abstract:This paper introduces the evaluation method of uncertainty for the calibration to the two-pressure humidity generator in the field, and the source of the uncertainty mainly comes from the precision dew point meter,the precision thermometer Pt100 and itself. Through the testing data for the humidity generator, it supplies the detailed analysis.

Abstract:介绍了双压法湿度发生器标准装置的技术指标、测量方法和不确定度评定.测试结果和不确定度分析表明,该发生器在25～ 25℃测量范围内,露点温度测量的不确定度不大于0.04℃.满足我国湿度量值传递的准确度要求.

Abstract:In the article, the recent research progress of biosensors is simply introduced, regarding the development of enzyme biosensors as the clues. Delivering the principle outset from the electronics of the enzyme , we discusses of the biosensors development process of three generations. Finally, the development tendency and prospect of biosensors in the future are predicted.

Abstract:The primary and -working standard on humidity measuring and their relationship are introduced in this paper. It also point out emphatically that it is significant to promise the measurement and calibration of humidity sensors, by correctly using standard humidity generator of two-pressure method, two-temperature method, divided flow method and saturated salt method.

Abstract:This paper mainly introduces the content and the development of"China Humidity Net".