共查询到18条相似文献,搜索用时 343 毫秒
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把落到目标上的总的环境辐射等效成一个温度为T0的黑体辐射,研究了环境辐射改变时对热成象系统灵敏度方程的影响,从而从理论上证明了用改变环境辐射的办法可以测定目标的比辐射率。给出了用红外测温仪测定环境等效黑体温度T0的方法和实验结果。给出了用红外测温仪测定目标比辐射率的一种新方法及实验结果。对于环境辐射不能忽略时如何用比辐射计测定目标的真实温度作了方法性和原理性的讨论。对于如何用测温仪测定地物对太阳的光谱反射率也作了方法性和原理性的讨论。
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利用红外测温仪、光学测温仪、热电偶测温仪(铂铑-铂)对微波电真空器件用浸渍阴极表面、覆膜阴极表面、阴极侧面(钼筒)进行了温度对比测试研究。结果表明:采用红外测温仪和光学测温仪测试浸渍阴极表面的温度与采用热电偶测温仪测试的温度相差不大,而覆膜阴极却相差约50 ℃;采用红外测温仪和光学测温仪测试阴极侧面(钼筒)的温度相差不大,都低于热电偶测温仪测试的温度约60 ℃,这说明红外和光学测试温度值低于阴极的实际温度(热电偶测量值)。由于在阴极表面出现了物理、化学变化,红外测温仪和光学测温仪测试的阴极表面温度值在1150 ℃左右加热100 min内增加约30 ℃。分析认为这些差异主要是因为覆膜阴极的表面与浸渍阴极的表面及阴极侧面(钼筒)的发射系数不同造成的,当然测试结果也会随着这些因素的变化而有一定的变化。 相似文献
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红外测温仪光学系统像质评价的一种方法 总被引:1,自引:1,他引:0
本文根据红外辐射测温仪实际工作情况,提出评价测温仪光学系统像质的一种方法。用全视场不同物面光线的点列图计算测温仪探测器接收的目标辐射能量及其集中程度;用计算目标距离不同时(目标温度不变)探测器所接收的辐射能量的相对误差来评价测温仪光学系统的像质。 相似文献
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红外光纤测温仪光学系统设计原理 总被引:1,自引:0,他引:1
介绍红外光纤测温仪光学系统的设计原理,指出在测温仪中严格限制红外视场来消除杂散辐射的干扰可使温度测量值不随被测目标距离的改变而变化。 相似文献
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爆炸水雾灭火是一种高效、快捷的新型灭火方式。为了研究爆炸水雾与油火的作用过程,采用CCD摄像机、微细热电偶、红外测温仪3种测试手段,获得了爆炸水雾与油火作用的图像以及灭火过程中温度的变化情况。实验结果表明:爆炸水雾在冲击油面后温度发生了突降,温度突降时间与CCD记录的水雾扑灭明火的时间一致;当水袋位于油盘正上方1.0m、炸药量为2.02g、水量为3kg时,灭火持续时间约为200ms;微细热电偶能够较准确地反映爆炸水雾灭火过程的温度变化,而红外测温仪可作为辅助测温手段定性分析灭火过程中的温度变化。 相似文献
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本文对在给定水的三相点的绝对温度以一定的数值(例如T3=273.1700),同时以绝对温标代替摄氏温标以后所引起的一些实际问题作了讨论。这些问题包括气体温度计的改正及电阻温度计和温差电偶温度计的规定。本文指出,在以绝对温标为标准以后,寻求冰点的绝对温度与对气体温度计的改正两种工作统一起来了。又指出,在以绝对温标为标准以后,绝对温度测量的精确度将大大提高。 相似文献
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《Journal of Magnetic Resonance, Series A》1993,101(3):299-306
The 119Sn MAS NMR resonances of the paramagnetic stannates Ln2Sn2O7 (Ln = Nd, Sm, and Y1.8Sm0.2) have been found to be extremely sensitive to temperature, the isotropic resonances varying, at room temperature, by 14 and 1.1 ppm K−l for Nd2Sn2O7 and Sm2Sn2O7, respectively. This sensitivity has been exploited to develop three chemical-shift thermometers with reciprocal dependences on temperature. Sm2Sn2O7 is suitable for temperature calibration of standard MAS probes and the solid solution Y1.8Sm0.2Sn2O7 is a shift thermometer with an internal reference. Nd2Sn2O7 is proposed as a high-temperature shift thermometer. These thermometers were used to determine the changes in sample temperature, in a Bruker 7 mm double-bearing probe, as the MAS speed was varied. A change of 8.5 K was observed on increasing the MAS speed from 1 to 5 kHz. The short relaxation times of the 119Sn nuclei enabled short recycle times to be used, and spectra of Sm2Sn2O7 could be obtained in seconds. 相似文献
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Investigation on the direct laser metallic powder deposition process via temperature measurement 总被引:1,自引:0,他引:1
The direct laser metallic powder deposition process was investigated with the aid of a radiant thermometer by building thin walls. The measured infrared (IR) temperature signal showed good correlation with the deposition process and the quality of the deposited samples. The influence of the powder particle size and the z-increment on the quality of the deposited samples and the IR-temperature signal was examined. It was found that the particle size of the powders shows no significant influence on the measured IR-temperature signal and the deposition process. However, both the deposition process and the measured temperature signal depended strongly on the z-increment. The variation of the melt pool temperature and cooling rate resulted in an inhomogeneous dimension accuracy, microstructure and hardness of the deposited sample. An abnormal deposition process can be recognized by the IR-temperature signal. 相似文献
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利用20—300K的Hall系数测量和6-300K的红外光吸收,研究了含氧P型CZ硅单晶经450℃不同时间热处理后所产生的热施主问题。Hall系数测量表明:经100hr热处理的样品存在两个施主能级:E1=58meV,E2=110meV。对不同热处理时间的样品,从低温红外光吸收则可看见由于热施主所引起的复杂吸收光谱。这些吸收峰的数目随着热处理时间的加长而增加和加强。利用类氢模型和有效质量理论拟会和计算,可以证明与氧有关的热施主很可能是双重电荷施主。这些双重施主有多种组态,它与450℃热处理的时间有关。
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A fully automated calorimeter has been designed and tested over the temperature range 200K–400K. The system may be used for
measurements with an absolute accuracy of 0.2% of samples of approximate mass 50g and thermal capacity 15 JK−1. The temperature of the sample is determined by a quartz crystal thermometer of resolution 100 μK which is not in direct
thermal contact with the sample. The performance of the system is illustrated by results obtained on high purity copper, distilled
water and K2PbCu(NO2)6 which exhibits very sharp first order phase transitions at about 273.4K and 281.8K. 相似文献