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This paper shows that the dimension of internal structure of a component can be measured remotely to a resolution better than 5 μm by use of the combination of high resolution optical microscopy and image processing.A specialised high resolution, long working distance and diffraction limited lens was used to image within the component. A series of digital images were made to map spatially the interior of the component. An edge detector was then used to localise the specific location of features in order that an accurate internal measurement could be made. A visualisation of the internal surface finish was also achieved. 相似文献
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改进型Czerny-Turner成像光谱仪光学系统设计方法 总被引:6,自引:2,他引:6
像散是目前影响Czerny-Turner结构成像光谱仪空间分辨率最大的像差。首先引入柱面反射镜,利用光焦度衡量像散大小,推导出易于计算的像散校正公式,有效地校正了像散。给出准直镜到光栅距离的计算方法,有效校正了成像光谱仪边缘视场像差。给出了成像光谱仪像面倾角的计算方法,实现了宽波段的像差校正。最终利用上述方法设计了一套用于115~200nm的改进型Czerny-Turner成像光谱仪,焦距f′=48mm,F数为5.0,全视场、全波段调制传递函数(MTF)在0.7以上。全波段光谱分辨率为0.22nm,像面大小为8mm×7mm。设计方法适用于多种结构要求的成像光谱仪。 相似文献
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A multiwalled carbon nanotubes (MWNT) modified glassy carbon electrode (GCE) coated with poly(orthanilic acid) (PABS) film
(PABS–MWNT/GCE) has been fabricated and used for simultaneous determination of dopamine (DA) and uric acid (UA) in the presence
of ascorbic acid (AA) by differential pulse voltammetry (DPV). Scanning electron microscopy, Fourier transform infrared spectra,
and electrochemical techniques have been used to characterize the surface morphology of the PABS–MWNT composite film and the
polymerization of ABS on electrode surface. In comparison with the bare GCE and the MWNT-modified GCE, the PABS–MWNT composite
film-modified GCE, which combines the advantages of MWNT and the self-doped PABS, exhibits good selectivity and sensitivity
for the simultaneous and selective determination of UA and DA in the presence of AA. Due to the different electrochemical
responses of AA, DA, and UA, PABS–MWNT/GCE can resolve the overlapped oxidation peak of DA and UA into two well-defined voltammetric
peaks with enhanced current responses using both cyclic voltammetry (CV) and DPV. The peak potential separations between DA
and UA are 170 mV using CV and 160 mV using DPV, respectively, which are large enough for the selective and simultaneous determination
of these species. In the presence of 0.5 mM AA, the DPV peak currents are linearly dependent on the concentration of UA and
DA in the range of 6–55 and 9–48 μM with correlation coefficients of 0.997 and 0.993, respectively. The detection limits (S/N = 3) for detecting UA and DA are 0.44 and 0.21 μM, respectively. The PABS–MWNT/GCE shows good reproducibility and stability
and has been used for the simultaneous determination of DA and UA in the presence of AA in samples with satisfactory results. 相似文献
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大口径轻质反射镜采用柔性支撑结构可以降低外界力载荷、惯性载荷及热载荷的负作用,从而保证光学系统的成像质量。为消除加工、检测与系统装调过程的定位误差,研究了应用于计算机控制能动磨盘加工(CCAL)技术抛光的柔性限位支撑模型。利用有限元分析软件(Ansys),分析φ1.8m轻质镜采用柔性限位支撑时,CCAL技术抛光引起轻质镜的最大倾斜量、最大主应力以及主镜面变化范围,对支撑盘的口径及位置进行了优化设计,模拟仿真18点弹簧在不同压缩量下的镜面变形。仿真分析结果表明,柔性限位支撑的结构刚度、轻质镜底板倾斜量满足能动磨盘加工条件,最大主应力强度远小于主镜的许用应力,主镜面变形符合加工要求。 相似文献
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分析了高次非球面与其加工用最接近球面之间的几何关系特点,提出了一种基于1维搜索的高精度高次非球面最接近球面计算方法。该算法可以计算二次或高次凹(凸)非球面的加工用最接近球面半径、球心位置及非球面度。通过计算实例与现有计算最接近球面的方法相比,该算法在计算高次非球面时将最大非球面度从500.8 m减小到30.0 m,在计算二次非球面时计算结果与精确公式法得到的结果一致。计算实例表明该方法计算高次非球面时得到的最接近球面更优、计算精度更高,且适用于任意次非球面最接近球面的精确计算。 相似文献