红外测温工作原理试题.pptVIP

输出选择 热偶输出 电流输出 0 - 20 mA 4 - 20 mA 电压输出 0 - 5 伏 标准1 mV /度 RS232/RS485输出 仪器接口 控制器 数字温度表 大屏幕显示器 图形记录仪 监视器 打印机 计算机 探头附件 当环境很恶劣时，红外 探头应进行保护 高温保护套 空冷和水冷 空气吹扫套 瞄准管及窗口 高温电缆 窗口 使探头与恶劣环境隔离 测量波长要能透过窗口 测高温时用硅玻璃或石英窗口 AMTIR 窗口可用于整个光谱范围 This chart illustrates blackbody curves at different temperatures. It shows that: Curves for different temperatures never cross. We can calibrate an instrument to measure temperature at any point in the electromagnetic spectrum. Energy increases with temperature. Temperature increases shift curve to shorter wavelengths. The slope of the curve is greater at shorter wavelengths. There is more energy difference per degree difference on the shorter wavelength side of the peak. Therefore, shorter wavelengths provide a more sensitive measure of temperature. Energy from object passes through environment Water vapor and CO2 may absorb energy, giving lower readings IR measurement bands Atmospheric correction built into products Energy from the object is transmitted through the atmosphere to the sensor. Dust, steam, and particles which are in the atmosphere between the object and the sennsor can reduce the radiated energy which reaches the sensor. Air purging keeps the lens of the sensor clear and clean. Sensor should be protected from high ambient tempeatures. Use water or air cooling along with air purgin. Use hgih tempeature cables and conduit if necessary. Careful selection of mounting location. T-ambient function correct for high tempertres in surrounding areas. 红外测温原理与选型 上海皇龙自动化工程有限公司 021江明 红外测温发展过程 1800年 赫胥尔发现红外线 1828年 M’Sweeny第一个辐射温度计 19世纪末 消隐光学高温计 1901年 全辐射测温仪专利(Fery) 1931年 商用全辐射测温仪问世 (LeedsNorthrup company) 60年代后 迅猛发展 近二十年 双色、光纤、扫描等 红外测温的原理红外测温仪可捕捉从所有物体辐射出的红外能量。红外辐射是电磁频谱的一部分，电磁频谱中包括无线电波、微波、可见光、紫外线、伽玛射线和X光。 可见光 紫外光 红外光 X-射线 Gamma Rays 无线电波 EHF SHF UHF VHF HF MF LF VLF 0.1A 1A 1UA 100A 0.1 1 10 100 1cm 0.1cm 10cm 1m 100m 1km