共查询到20条相似文献,搜索用时 78 毫秒
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为了保证中阶梯光栅光谱仪能够具有足够的波段范围,设计了一套校正装置,对该校正装置的校正原理、波段校正范围、校正分辨率等问题进行了讨论和研究。首先,对中阶梯光栅光谱仪的光学元件进行了公差分析,并介绍了自动光谱校正的原理和流程。选定聚焦镜作为调整环节并根据CCD接收器像面的利用情况给出了调整分辨率要求,然后设计了校正装置,并对校正装置的分辨率进行了理论计算。最后,对校正装置的校正效果进行了实验验证。实验结果表明:校正装置在方位方向的校正分辨率可达0.006 25°、俯仰方向的分辨率可达0.006 25°、前后方向的分辨率可达0.005mm。校正装置可以将10像素的波段偏移调整回CCD正常接收范围内,从而保证光谱仪器的全谱段波段范围。 相似文献
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衍射双波段红外光学系统设计 总被引:1,自引:0,他引:1
基于定向光栅能对不同波长的不同级光谱闪耀的原理,从一种比较新颖的角度将衍射光学元件成功地应用于双波段红外光学系统设计,使系统在衍射效率达80%的中波红外波段3.8~4.2μm和长波红外波段8.8~11.5μm同时较好地完成像差校正,会聚到共同的焦点。最后以一个f/2单透镜衍射光学系统进行了验证。设计结果表明,此双波段光学系统结构紧凑、原理简单、不需要额外的机械设备,为双波段成像、探测提供了一条新的思路。 相似文献
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红外观察仪图像畸变的校正 总被引:9,自引:1,他引:9
通过对红外观察仪成像失真原因的分析,建立了一个非线性畸变校正的数学模型,该模型适用存在径向非线性失真的成像系统,并基于该模型对红外观察仪输出的图像进行了畸变校正,给出了实验结果,经过校正后的图像检测点的最大定位误差在1个像素以内。方案还具有可扩充性和可移植性。 相似文献
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多波段共口径红外系统光机热一体化设计 总被引:3,自引:0,他引:3
针对红外系统对热辐射比较敏感的特点,即除了来自系统外部的杂散热辐射会影响系统的性能,系统内部的热辐射也会降低系统的灵敏度,在研制某型号红外系统中,根据技术指标对其光学系统、机械结构以及热辐射抑制进行了详细论述和设计.系统口径1000mm,采用可见光、中波红外、长波红外3个光谱波段共用口径的光学结构,可见光波段焦距2000 mm,目视鉴别率690 lp/mm,中波红外波段焦距为2000 mm,长波红外波段焦距为2000 mm.采用地平式二维转动机构以实现对成像头部组件俯仰、方位的调整,保证对目标的瞄准和跟踪.重点对系统内部杂散辐射进行了分析,包括机械内壁不同表面不同发射率对像面接收辐射能的影响,以及光机内壁不同温度不同发射率对像面接收辐射能的影响.设计了水冷循环系统制冷光机系统的温度,降低系统内部杂散辐射.测试结果表明,可见光波段焦距及目视鉴别率达到了预先设计的要求值,各红外分系统的焦距也分别到达了预先设计的要求值,所摄取的图像对比度清晰. 相似文献
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报道了MPF-4荧光光谱仪波长系统的故障分析和排除方法,给出了故障的修复实例,并介绍了波长的校正方法和步骤。 相似文献
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本文介绍一种用于提高QB476型红外水份仪测量精度的自校正系统。该方法适用于所有受某些因素影响而需要人工调电位器来修正零点的仪器、仪表。 相似文献
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针对红外光谱分析在高校实验教学和科研中,如在有机化学、生物化学、药物学等专业类的实验教学及科研项目中的重要作用及遇到的一些实际问题,根据自己在实际工作中的经历,介绍红外光谱解析的步骤、红外光谱解析中要注意的事项及制样中的一些技巧等. 相似文献
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《Measurement》2015
Registration of thermoluminescence (TL) spectra technique for irradiated samples in Perkin Elmer LS 55 spectrometer using developed high-temperature accessory during single heating cycle is shown. Functionality of serial instrument for RT–773 K temperature range is significantly widen. Spectrally resolved TL dependencies for h-BN micropowders and bulk AlN single crystals following UV irradiation are studied. TL spectral features of h-BN powders, synthesized by carbamide and plasma-chemical techniques, are determined and quantified. It is shown that the difference between TL curves obtained by the described and the standard modes does not exceed 10%. 相似文献
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New analytical methods using fluorescence detection are becoming increasingly quantitative and require easy-to-use material standards for fluorometer qualification and method validation. NIST is responding to this need by developing and producing such standards. Reported here is the first step in this process, which is to qualify a research-grade fluorescence spectrometer for measuring true fluorescence spectra of reference material candidates. "True" spectra are defined here as those with fluorescence intensity, either relative or absolute as required, and wavelength both being reported with high accuracy and known precision, after wavelength has been calibrated and corrections for excitation intensity and detection system response have been applied. The uncertainties determined in relative and absolute intensity-corrected fluorescence spectra using both calibrated source (CS)- and calibrated detector (CD)-based methods were compared. The CS-based method gave uncertainties, typically about +/-5% for relative spectral correction, that were about half that of the CD-based method for determining both relative and absolute spectral correction factors. Absolute spectral correction factors can be determined using either method without knowing the optical geometry of the instrument. The absolute spectral correction factors were found to have much larger uncertainties than the corresponding relative correction factors with uncertainties for the CS-based method of +/-10% to +/-15% being typical and +/-20% or more not being uncommon, particularly for excitation and emission wavelengths below 400 nm. Uncertainties arising from detection system nonlinearity and instrument polarization ratios were also explored. 相似文献
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An evanescent-field scanning microscope for infrared microanalysis has been developed. This microscope uses an evanescent field produced by total internal reflection with a high refractive index prism to attain a high spatial resolution, better than the wavelength. This microscope was combined with a Fourier-transform spectrometer. The principle of the method and experimental results for edge detection at different absorption wavelengths are described. 相似文献
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介绍了MagiX型X射线荧光光谱仪在使用过程中的常见故障,分析了故障产生的原因,提出了解决办法和使用中应注意的事项. 相似文献