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顾培夫 《仪表技术与传感器》1982,(4)
本文依据等效折射率概念,通过膜系匹配,得到了优良的截止滤光片和负滤光片。由于设计中充分考虑到材料选择和膜厚控制的限制,故设计得到的滤光片在工艺上是易于实现的。 相似文献
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诱导透射滤光片的特性分析与制备 总被引:1,自引:0,他引:1
采用金属和介质膜组合的诱导透射滤光片,具有高透射和宽截止的优良特性。本文介绍了用于可见区和近红外区的二种诱导透射滤光片的理论分析、制备工艺及其实验结果。 相似文献
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高截止度宽带红外滤光片是新型红外地球敏感器的关键件之一。介绍了高截止度宽带红外滤光片的设计方法和镀膜的工艺技术 ,给出了膜系设计和研制的结果 ,并与国内外同类滤光片的光学特性进行了比较 ,试验表明这种红外滤光片的膜系设计是成功的 相似文献
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论述用于激光荧光肺癌定位系统滤光片的膜系设计,制备这套滤光片所采取的工艺措施,最后给出研制的结果。 相似文献
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红外地球敏感器用高截止度宽带红外滤光片研制 总被引:1,自引:0,他引:1
高截止度宽带红外滤光片是新型红外地球敏感器的关键件之一.介绍了高截止度宽带红外滤光片的设计方法和镀膜的工艺技术,给出了膜系设计和研制的结果,并与国内外同类滤光片的光学特性进行了比较,试验表明这种红外滤光片的膜系设计是成功的. 相似文献
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高截止度宽带红外滤光片是新型红外地球敏感器的关键件之一.介绍了高截止度宽带红外滤光片的设计方法和镀膜的工艺技术,给出了膜系设计和研制的结果,并与国内外同类滤光片的光学特性进行了比较,试验表明这种红外滤光片的膜系设计是成功的. 相似文献
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在六氟化硫气体检测中经常会使用红外气体传感器,红外滤光片是红外气体传感器的核心元件。对六氟化硫的红外气体探测中,研制性价比较高的10.56 μm窄带滤光片尤其重要。首先,通过测量空气和六氟化硫气体的红外吸收光谱,明确了基于NDIR技术的红外传感器需要的滤光片的光谱指标。然后,使用单晶硅为基底,锗和硫化锌为高、低折射率材料,设计了窄带膜系和截止膜系两种膜系结构。通过选择合理的工艺参数,镀制了中心波长为10.562 μm、带宽为175 nm、峰值透射率为80.2%、截止范围为2~18 μm(除通带)的红外滤光片。最后,经环境测试和传感器测试,证明该滤光片满足使用要求。 相似文献
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Funane T Atsumori H Kiguchi M Tanikawa Y Okada E 《The Review of scientific instruments》2011,82(9):093101
A noncontact near-infrared scanning system for multi-distance absorption measurement of deep biological tissue was developed. An 808-nm laser, whose focal point on the surface of biological tissue is controlled by a galvano scanner, is used as a light source. A phosphor is placed at a detection focal point on the tissue surface. The light that propagates through tissue and exits from the tissue surface beneath the phosphor excites the phosphor. The fluorescence emitted from the phosphor is detected by an avalanche photodiode. The system is used to measure 20 points on tissue surface at which source-detector (S-D) distances are 7-45 mm (with 2-mm intervals). Neither the light source nor the detector contacts the tissue surface. The system was validated by using it to measure the absorption change of an absorber (which is embedded in a deep layer of a tissue-simulating phantom) while the surface-layer thickness of the phantom was changed from 1 to 12 mm. It was demonstrated that both the relative absorption change of the absorber and the absolute thickness of the surface layer can be estimated from the measured optical-density change (ΔOD) and the dependence of ΔOD on S-D distance, respectively. 相似文献
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提出了一种采用基于电流模的放大器和滤波器电路设计方法,并利用第二代电流传输器CCⅡ实现了三阶巴特沃思低通电流模滤波器。在对第二代电流传输器结构和原理进行分析的基础上,利用CCⅡ设计了三阶巴特沃思低通电流模滤波器,并把R和C提取到CCⅡ芯片外面使它更好应用于低频荧光信号测量。电路经过Pispice的仿真证明了电路的可行性,从而提高了荧光信号检测电路的速度和信噪比,使得检测精度大大提高。本文提出的方法正确、原理清楚、电路可行。并且,电流模技术为微弱荧光信号的低噪声测量、放大和滤波提供了一条可行的技术路线。 相似文献
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针对车载激光路面断面仪性能受检测车垂直振动及姿态变化影响的问题,设计并实现了一种车载激光断面仪运动补偿用IMU/GPS/OD组合测量系统,采用低成本IMU结合捷联解算算法计算检测车的三维位置、速度和姿态,通过GPS和里程仪结合最优滤波技术抑制低成本IMU在捷联解算过程中形成的累积误差,并提出了一种基于IMU/GPS/OD组合测量系统的检测车垂直振动位移的计算方法。最后进行了室内实验验证,实验结果表明,该IMU/GPS/OD组合测量系统应用于车载激光断面仪是可行的。 相似文献
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Fluorescence detection, in principle, permits the detection of the extended x-ray absorption fine structure (EXAFS) of more dilute atoms than can be obtained in absorption. To take advantage of this it is necessary, in practice, to eliminate the background that normally accompanies the fluorescence signal. We describe an x-ray filter assembly that accomplishes this purpose. The unique characteristic of the assembly is a slit system that minimizes the fluorescence background from the filter. The theory of the slit assembly is presented and is found to agree with measurements made on the Fe EXAFS of a dilute sample. The filter assembly has a better effective counting rate in this case than that of a crystal monochromator design. 相似文献
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Spectral (or multi-color) microscopy has the ability to detect the fluorescent light of biological specimens with a broad range of wavelengths. Currently, the acousto-optic tunable filter (AOTF) is widely used in spectral microscopy as a substitute for a multiple-dichroic mirror to divide excitation and emission signals while maintaining sufficient light efficiency. In addition, systems which utilize an AOTF have a very fast switching speed and high resolution for wavelength selection. In this paper, confocal-spectral microscopy is proposed with a particular spectrometer design with a wavelength-scanning galvano-mirror. This enables the detection of broadband (480-700 nm) fluorescence signals by a single point detector (photomultiplier tube) instead of a CCD pixel array. For this purpose, a number of optical elements were applicably designed. A prism is used to amplify the dispersion angle, and the design of the relay optics matches the signals to the diameter of the wavelength-scanning galvano-mirror. Also, a birefringent material known as calcite is used to offset the displacement error at the image plane depending on the polarization states. The proposed multi-color confocal microscopy with the unique detection body has many advantages in comparison with commercial devices. In terms of the detection method, it can be easily applied to other imaging modalities. 相似文献