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Simultaneous Determination of Zirconium and Hafnium by Dual System and Dual Wavelength Spectrophotometry

Rare Metals 1993年第4期12卷 301-304页

作者：张贵珠刘蜀利杨万龙何锡文史慧明 Nankai University Tianjin 300071China

A dual system and dual wavelength spectrophotometry (DSDWS) used to simultaneously determine Zr and Hf were proposed. Zr(Hf)-XO-CIMAB and Zr(Hf)-CAB-CDMAA-Triton X-100 were chosen as a pair of chromophoric systems. The difference of chromophoric behaviours between Zr and Hf is increased by the addition of hydrogen peroxide as masking agent and by adjustment of acidity. The apparent molar absorptivities of Zr and Hf are 2.0×105 and 5.0×104 L·mol-1·cm-1 respectively. The procedure is simple and rapid.

关键词： Hafnium Measurements Spectrophotometry Wave propagation wavemeters

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Compact diffraction grating laser wavemeter for cold atom experiments

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Optoelectronics Letters 2017年第5期13卷 335-338页

作者：魏春华颜树华张甜 Department of Instrument Science and Technology College of Mechatronic Engineering and Automation National University of Defense Technology Interdisciplinary Center for Quantum Information National University of Defense Technology Xi'an Aerospace Huaxun Technology Co. LTD.

We present an innovative and practical scheme of building a miniaturized wavemeter, with the advantages of low cost, high reliability and simple structure. Through a calibration test by a 780 nm external cavity diode laser(ECDL), the results show that our system gets a wavelength resolution of better than 1 pm, measurement accuracy of better than 2 pm(corresponding to a frequency of 1 GHz), and a measurement range of 8.5 nm. Finally, the multi-mode comparison test between our system and a commercial spectrum analyzer further indicates the high-precision, miniaturization and low cost of the proposed system, which shows that it is particularly suitable for ECDL and atom cooling and trapping experiments. The system design, experimental results and conclusions are of definite significance as a fine reference for other ranges of wavelength.

关键词： Calibration Spectrum analyzers wavemeters

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Breaking the speed limitation of wavemeter through spectra-space-time mapping

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Light(Advanced Manufacturing) 2024年第2期5卷 33-40页

作者： Zheng Gao Ting Jiang Mingming Zhang Yuxuan Xiong Hao Wu Ming Tang Wuhan National Laboratory for Optoelectronics(WNLO)and Next Generation Internet Access National Engineering Laboratory(NGIA) School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China

Speckle patterns generated by the intermodal interference of multimode fibers enable accurate broadband wavelength ***,the measurement speed is limited by the frame rate of the camera that captures the *** propose a compact and cost-effective ultrafast wavemeter based on multimode and multicore fibers,which employs spectral-spatial-temporal *** speckle patterns generated by multimode fibers enable spectral-to-spatial mapping,which is then sampled by a multicore fiber into a pulse sequence to implement spatial-to-temporal mapping.A high-speed single-pixel photodetector is employed to capture the pulse sequence,which is analysed using a multilayer perceptron to estimate the *** feasibility of the proposed wavelength estimation method is experimentally verified,achieving a measurement rate of 100 MHz with a resolution of 2.7 pm in a 1 nm operation bandwidth.

关键词： Speed wavemeters Spectra

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