双通道测色分光光度系统的信号处理

理论上提出了一种双通道测色分光光度系统的软硬件模型，并从信号处理的角度分析了该系统的工作原理。实践证明：采用新的软硬件模型后，系统性能在几个方面优于现行的双通道系统。     

一种快速测色分光光度计

分光光度计一般用于反射样品或透射样品的光谱测量,广泛用于化学、生物学、医疗、药检、纺织、油漆、印刷、遥感等民用工业和国防工业,获得的光谱信息在现代科技中有十分重要的价值。北京理工大学研制的测色分光光度计ＣＳＬ－１０００的组成和传统的分光光度计有所不同,它无须复杂的机械光栅扫描运动机构,省去了出射狭缝。主要由光源（闪光灯）、光耦合系统、入射狭缝、分光器、光电二极管阵列探测器、电子学系统和相应的软件组     

一种新型的分光光度计

NV-9501型可见-近红外分光光度计是由浙江大学研制成功的一种新型双光束分光光度计。本文简要介绍了仪器的结构、技术指标和特点。     

一种新型的分光光度计

ＮＶ－９５０１型可见－近红外分光光度计是由浙江大学研制成功的一种新型双光束分光光度计。本文简要介绍了仪器的结构、技术指标和特点。     

一种双操作模式的荧光分光光度计

介绍一种可工作于MC和CRT双操作模式的荧光分光光度计，给出了其工作原理和MC模式下的软硬件实现方案。该仪器可方便的在两种操作模式之间切换。     

红外分光光度计发展概况

本文对国内外红外分光光度计的发展作了综述。通过对国外主要厂家典型产品的分析,评价了国外红外分光光度计的技术水平。重点介绍了近年来付里叶变换红外分光光度计在干涉仪性能、高速扫描、KBr分束器、空间双光束技术、光源及提高分辨率等方面的技术进展和今后可能的发展趋势。简要介绍了国外仪器市场情况。对国内红外分光光度计的发展和现状作了较详细的介绍,对当前急需解决的问题提出了建议。     

一种快速分光光度计光栅参数的选择

介绍了快速分光光度计的组成 ,简述了光栅单色器的能量分布及其主要指标——色散 ,根据单色器光栅能量分布和该分光光度计的光谱范围进行光栅参数选择。使用这种方法选择的光栅完全满足快速分光光度计性能指标要求。     

紫外分光光度计介绍

紫外分光光度计分为单波长及双波长两大类,其中单波长分光光度计,又可分为单光束和双光束两类。如果按仪器结构分,可分为电子管型、晶体管型、集成数显和微机型四类。如果按用途分,可分为通用型、微量型、记录型、扫描型和多功能型五类。下面分别介绍。1.电子管型紫外分光光度计     

通用分光光度计的现代设计实践

描述了通用分光光度计的全新设计思想方案,并讨论了据此想法开发的系列产品的特点性能。     

A Novel Opto-Mechanical System Coupled to a Spectrophotometer for Measuring Coatings on Small Size Substrates and Optical Fiber Filters

Abstract

A novel opto-mechanical system coupled to a commercial spectrophotometer using optical fibers was developed to measure optical transmittance of small samples, like filters deposited on optical fiber tips or micrometric substrates, as well as to investigate transmission uniformity of filters by surface scanning. It consists of two identical modules, reference and sample, both inserted in the chamber of the spectrophotometer. Each module was formed by an optical fiber, 200 µm core diameter and numerical aperture of 0.22, supported by adjustable positioning mounts for easing alignment. The system was validated by measuring the transmittance spectrum of a coated glass substrate with and without the opto-mechanical system, showing no significant differences between both methods. To determine the system versatility were undergone two transmittance experiments: one for a filter deposited on the tip of an optical fiber and the other by scanning the surface of a coated glass substrate. It can be concluded that the opto-mechanical system allows to measurement the transmittance of small size filters and optical fibers filters, as well as to scan over large coated surfaces to investigate coating uniformity.     

MAP在生产车间的简化应用

分析了现有卡尺量值传递方式在实际工作中的不足,利用MAP的基本原则——过程统计控制,在生产车间卡尺的质量控制上简化应用计量保证方案:把车间的计量室作为主持实验室,生产车间作为参加实验室,卡尺的量值直接在生产车间进行控制。不但提高了车间的测量质量,而且降低了相关费用。     

产品色彩的配色原则与品牌形象

分析了色彩的配色原则,依据色彩的色相、明度、纯度变化关系将色彩的组合搭配分为三种形式：弱对比色彩搭配、中对比色彩搭配和强对比色彩合搭配,并探讨了在不同使用环境下,如何进行色彩的配色,进而满足人们不同的心理需求,使设计作品呈现出丰富的审美面貌,营造强烈的产品和品牌形象,最终提高企业的竞争力。     

Large scale spectrum survey in rural and urban environments within the 50 MHz–6 GHz bands

In-depth spectrum measurement was conducted in rural and urban locations, covering 50 MHz–6 GHz bands, during the weekdays and weekends. A modified duty cycle metric is presented by introducing a space variable into the existing metrics available today. An adaptive energy detection threshold technique was employed, the results indicate the average spectral occupancy of 0.18%, and 5.08% in rural and urban locations respectively during weekdays and 1.45% on weekends for urban locations. Furthermore, short and long term temporal variations of the duty cycle for each of the bands were studied, and it was found that GSM 900 shows significant temporal variation when compared with GSM 1800. It was also found that the choice of the detection threshold would significantly affect the duty cycle as GSM 900 and 1800 give exponential decay with increase in detection threshold while TV band shows very sharp exponential decay which becomes invariant after −85 dBm.     

3200型原子吸收分光光度计气路控制系统维修一例

介绍了维修３２００型原子吸收分光光度计气路控制系统所采取的措施。     

Mobile measurement of radiofrequency electromagnetic field exposure level and statistical analysis

In this study, radiofrequency electromagnetic field exposure levels were measured as mobile on the main streets of Diyarbakır during a week. The measurements were carried out using high precision spectrum analyzer with an isotropic antenna mounted on the top of a car. With this mobile measurement, large areas were measured in a short time and information about characteristics of electromagnetic environment was obtained quickly. Measurement results showed that measurement values were not in normal distribution and variances between independent variables were not homogeneous. According to Spearman’s rho correlation coefficient, there was no strong correlation between measurement days. In terms of mean electric field values, contribution of each band to total band was arranged as UMTS DL, GSM900 DL, GSM1800 DL, TV4-5, FM, and TV3 band, respectively. It was determined that all measurement values were below the reference levels of the International Commission on Non-Ionizing Radiation Protection.     

畸变电功率的模型化测量方法

本文为畸变电功率提出了一模型化的测量方法。在对待测畸变瞬时功率信号建立一参数化模型的基础上，证明了畸变电功率可由其瞬时功率信号采样值的加权平均准确获得，并推导出了由采样值求权参数的方法。提出的方法，允许畸变的瞬时功率信号含有电网频率的非整数次谐波（Ｓｕｂｈａｒｍｏｎｉｃ），允许采样过程小于电网的周期，据此方法获得的测量结果在理论上严格成立。一个算例验证了其有效性