Crosstalk of HgCdTe long-wavelength infrared （LWIR） n-on-p diode arrays was measured using scanning laser microscopy. During the measurement, HgCdTe diode arrays with different diode pitches were frontside illuminat...Crosstalk of HgCdTe long-wavelength infrared （LWIR） n-on-p diode arrays was measured using scanning laser microscopy. During the measurement, HgCdTe diode arrays with different diode pitches were frontside illuminated by a He-Ne laser at liquid nitrogen temperature and room temperature. The experimental results show that crosstalk between the nearest neighboring diodes decreases exponentially as the diode pitch increases, and the factors that affect the obtained crosstalk are presented and analyzed. Crosstalk out of the nominal diode area （optically sensitive area） is also measured and discussed.展开更多
The solidification process of AISI 304 stainless steel during cooling at a rate of 0.05 K/s has been observed in situ using a confocal scanning laser microscope （CSLM）. The results show that the 8 phase appeared fir...The solidification process of AISI 304 stainless steel during cooling at a rate of 0.05 K/s has been observed in situ using a confocal scanning laser microscope （CSLM）. The results show that the 8 phase appeared first in liquid steel, as the temperature decreased, the γ phase precipitated prior at δ-grain boundary at 1452. 2 ℃, the liquid steel disappeared at 1 431.3 ℃, and then the γ phase precipitated on the δ ferrite. Based on the Scheil-Gulliver solidification model, the solidification processes of AISI 304 stainless steel are simulated using the Scheil model in Thermo Calc, and the simulation results agree well with the results observed in the experiment.展开更多
31Cr Mo V9是欧洲牌号的高淬透性合金钢,属于近几年国产化过程中新研制的钢种。为比较国内外成品钢质量的差距,提高中国该钢种的冶炼水平,选取不同产地的31Cr Mo V9钢,对其中的非金属夹杂物进行研究。电解钢样观察其中夹杂物的外观形貌...31Cr Mo V9是欧洲牌号的高淬透性合金钢,属于近几年国产化过程中新研制的钢种。为比较国内外成品钢质量的差距,提高中国该钢种的冶炼水平,选取不同产地的31Cr Mo V9钢,对其中的非金属夹杂物进行研究。电解钢样观察其中夹杂物的外观形貌,并对钢样进行金相观察和利用高温共聚焦显微镜观察钢样的组织变化。研究发现,单一成分的夹杂物多为长条状,而复合夹杂物多为球形。研究过程所选取的中国生产的钢材与德国钢材在夹杂物的数量和形态控制上存在差距,中国生产的钢材单位面积内夹杂物的数量更多,夹杂物的大小不均匀,形态控制不理想。就成分而言,德国钢材的夹杂物成分主要是以Al2O3、Ca O、Mn S等组成的复合夹杂物,而中国钢材的夹杂物存在着成分的波动性。共聚焦显微镜试验过程中发现,在升温过程中夹杂物会发生球化现象,降温过程中,钢样开始形成马氏体组织的温度有所不同,中国钢样为580℃,德国钢样为450℃,这与其本身晶体的成分有关,最后的组织为马氏体+碳化物颗粒+残余奥氏体。展开更多
基金Project supported by the National Natural Science Foundation of China (Nos.60221502,10434090)the Shanghai City Committee of Science and Technology in China (Nos.07JC14058,0752nm016)
文摘Crosstalk of HgCdTe long-wavelength infrared （LWIR） n-on-p diode arrays was measured using scanning laser microscopy. During the measurement, HgCdTe diode arrays with different diode pitches were frontside illuminated by a He-Ne laser at liquid nitrogen temperature and room temperature. The experimental results show that crosstalk between the nearest neighboring diodes decreases exponentially as the diode pitch increases, and the factors that affect the obtained crosstalk are presented and analyzed. Crosstalk out of the nominal diode area （optically sensitive area） is also measured and discussed.
基金Item Sponsored by National Natural Science Foundation of China(50434040)
文摘The solidification process of AISI 304 stainless steel during cooling at a rate of 0.05 K/s has been observed in situ using a confocal scanning laser microscope （CSLM）. The results show that the 8 phase appeared first in liquid steel, as the temperature decreased, the γ phase precipitated prior at δ-grain boundary at 1452. 2 ℃, the liquid steel disappeared at 1 431.3 ℃, and then the γ phase precipitated on the δ ferrite. Based on the Scheil-Gulliver solidification model, the solidification processes of AISI 304 stainless steel are simulated using the Scheil model in Thermo Calc, and the simulation results agree well with the results observed in the experiment.
文摘31Cr Mo V9是欧洲牌号的高淬透性合金钢,属于近几年国产化过程中新研制的钢种。为比较国内外成品钢质量的差距,提高中国该钢种的冶炼水平,选取不同产地的31Cr Mo V9钢,对其中的非金属夹杂物进行研究。电解钢样观察其中夹杂物的外观形貌,并对钢样进行金相观察和利用高温共聚焦显微镜观察钢样的组织变化。研究发现,单一成分的夹杂物多为长条状,而复合夹杂物多为球形。研究过程所选取的中国生产的钢材与德国钢材在夹杂物的数量和形态控制上存在差距,中国生产的钢材单位面积内夹杂物的数量更多,夹杂物的大小不均匀,形态控制不理想。就成分而言,德国钢材的夹杂物成分主要是以Al2O3、Ca O、Mn S等组成的复合夹杂物,而中国钢材的夹杂物存在着成分的波动性。共聚焦显微镜试验过程中发现,在升温过程中夹杂物会发生球化现象,降温过程中,钢样开始形成马氏体组织的温度有所不同,中国钢样为580℃,德国钢样为450℃,这与其本身晶体的成分有关,最后的组织为马氏体+碳化物颗粒+残余奥氏体。
