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Instrumentation, measurement, and metrology
Large-scale absolute distance measurement with dual free-running all-polarization-maintaining femtosecond fiber lasers
Download:1105次
Yuepeng Li
1
Yawen Cai
2,*
Runmin Li
1
Haosen Shi
1
[ ... ]
Minglie Hu
1
Author Affiliations
Abstract
1
Ultrafast Laser Laboratory, Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
2
Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, China
3
National Institute of Metrology, Beijing 100029, China
We demonstrate a robust femtosecond LIDAR setup by using two free-running environmentally stable all-polarization-maintaining nonlinear amplified loop mirror mode-locked fiber lasers. Based on the asynchronous optical sampling method, a ranging accuracy of ±2 μm within 65 m has been achieved, as tested in an 80-m-long underground optical tunnel. Through the Kalman filter in real-time data processing, the measurement accuracy can be maintained at a 200 Hz update rate. This setup provides a practical tool for various large-scale industrial and astronomical ranging applications.
120.0120
Instrumentation, measurement, and metrology
140.4050
Mode-locked lasers
320.7090
Ultrafast lasers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(9): 091202
Instrumentation, measurement, and metrology
Absolute cryogenic radiometer for high accuracy optical radiant power measurement in a wide spectral range
Download:842次
Haiyong Gan
*
Yingwei He
Xiangliang Liu
Nan Xu
[ ... ]
Yandong Lin
Author Affiliations
Abstract
Division of Optics, National Institute of Metrology, Beijing 100029, China
An absolute cryogenic radiometer (ACR) with a detachable optical window was designed and built for high accuracy optical radiant power measurement and photodetector spectral responsivity calibration. The ACR receiver is an electroplated pure copper cavity with a 50-μm-thick wall and inner surface coated with a specular black polymer material mixed with highly dispersible carbon nanotubes. The absorptivity of the cavity receivers was evaluated to be ≥0.9999 in the 250 nm–16 μm wavelength range and ≥0.99995 in 500 nm–16 μm. The cavity receiver works at the temperature of ~5.2 K with nanowatt-level noise-equivalent power. The relative standard uncertainty is 0.041% for the measurement of ~100 μW optical radiant power (250 nm–16 μm) and 0.015% for ~1 mW (500 nm–16 μm).
120.3930
Metrological instrumentation
120.3940
Metrology
120.5630
Radiometry
PDF全文
Full Text
Chinese Optics Letters
2019, 17(9): 091201
Instrumentation, measurement, and metrology
All-fiber pulsed laser Doppler vibrometer development based on time-domain chopping techniques
Download:787次
Shisong Wu
1,2
Yuanyang Li
1,*
Tao Lü
1,2
Hongkai Chen
1,2
[ ... ]
Jin Guo
1,2
Author Affiliations
Abstract
1
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
A 1550 nm all-fiber pulsed laser Doppler vibrometer (LDV) based on time-domain chopping techniques is developed to overcome demodulation failures caused by multipath interference. The system adopts an adjustable configuration on pulse duration and pulse repetition frequency according to the distance. An experiment is carried out at a 25 m standoff with pulse duration of 80 ns, single pulse energy of 0.4 nJ, and pulse repetition frequency of 1 MHz. A waveform and spectrogram of the demodulated voice show that the pulsed LDV system has a good performance in long-range voice listening.
120.7280
Vibration analysis
280.3340
Laser Doppler velocimetry
040.2840
Heterodyne
PDF全文
Full Text
Chinese Optics Letters
2019, 17(5): 051201
Instrumentation, measurement, and metrology
A miniaturized system for measurement of the refractive index of sub-microliter liquid
Download:699次
Minghui Chen
1,2
Wenyu Jia
1
Jintao He
1
Martial Geiser
3
Gang Zheng
1,*
Author Affiliations
Abstract
1
Institute of Biomedical Optics and Optometry, Shanghai Institute for Minimally Invasive Therapy, University of Shanghai for Science and Technology, Shanghai 200093, China
2
Beckman Laser Institute and Center for Biomedical Engineering, University of California, Irvine, CA 92612, USA
3
Systems Engineering Institute, University of Applied Sciences Western Switzerland, Sion 1950, Switzerland
This study introduced the research and development of a portable and miniaturized system for the measurement of the refractive index of sub-microliter liquid based on a microfluidic chip. A technical method of double-beam interference, was proposed for use in the measurement. Based on this, by using a laser diode as a light source, changes in the refractive index were calculated by utilizing a complementary metal–oxide–semiconductor to detect the movement of interference fringes of the liquid. Firstly, this study simulated the effects of influencing factors on the interference infringes of two Gaussian beams, such as their spot sizes, distance between two beam spots, and detection range. Secondly, this research introduced the system design and construction of the double-beam interference method and analyzed the results of refractive index tests on sub-microliter aqueous glucose solutions with different concentrations. The measurement accuracy reached 10
4
refractive index units. This system has a compact structure and is rendered portable by using batteries for its power supply. The entire system is designed to be a double Z-shaped structure with a length of about 15 cm, a width of 5 cm, and a height of about 10 cm. It can be used to measure changes in the refractive index of sub-microliter to nanoliter liquids based on the use of a microfluidic chip.
120.3890
Medical optics instrumentation
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Chinese Optics Letters
2019, 17(4): 041201
Instrumentation, measurement, and metrology
Participation in the absolute gravity comparison with a compact cold atom gravimeter
Download:839次
Zhijie Fu
1,2
Qiyu Wang
1
Zhaoying Wang
1,*
Bin Wu
2
[ ... ]
Qiang Lin
2,**
Author Affiliations
Abstract
1
Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027, China
2
Center for Optics and Optoelectronics Research, College of Science, Zhejiang University of Technology, Hangzhou 310023, China
The first Asia-Pacific Comparison of Absolute Gravimeters (APMP.M.G-K1) was organized by the National Institute of Metrology (NIM) of China from December 21, 2015 to March 25, 2016 in Changping, Beijing. Our compact cold atom gravimeter (CCAG) was transported from Hangzhou to Beijing with a long distance of about 1200 km to participate in this comparison. The CCAG is the only one, to the best of our knowledge, that is based on the principle of atom interferometry among all the instruments. Absolute gravity in the indicated three test sites has been measured as requested by the organizer. The sensitivity of our CCAG is estimated to be
90
μ
Gal
/
Hz
, even when the measurements are carried out without any vibration isolation. Besides, the accuracy of this gravimeter has been evaluated to be about
19
μ
Gal
by considering the significant system errors. Our results show a good agreement with the given reference value.
120.3180
Interferometry
PDF全文
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Chinese Optics Letters
2019, 17(1): 011204
Instrumentation, measurement, and metrology
Method for simultaneously and directly measuring all six-DOF motion errors of a rotary axis
Download:678次
Jiakun Li
Qibo Feng
*
Chuanchen Bao
Bin Zhang
Author Affiliations
Abstract
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
We report a method for simultaneously and directly measuring all six-degrees-of-freedom (six-DOF) motion errors of a rotary axis. Such a method combines the principles of laser interferometry and laser collimation measurement. One reference rotary axis and two retro-reflectors are used to achieve simultaneous sensitivity to all six errors in a full-circle measuring range. As no separation models are required, our method is capable of dynamically measuring these errors in real time and conveniently determining the origin of the errors. An automatic measuring device is built. The effectiveness of our method is experimentally demonstrated.
120.3930
Metrological instrumentation
PDF全文
Full Text
Chinese Optics Letters
2019, 17(1): 011203
Instrumentation, measurement, and metrology
Double-pass grating imaging spectrometer
Download:807次
Xin Meng
1
Zhongming Yang
2,*
Jinyu Du
3
Guobin Fan
3
Author Affiliations
Abstract
1
Science and Technology on Electronic Test & Measurement Laboratory, The 41st Research Institute of CETC, Qingdao 266555, China
2
School of Information Science & Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, China
3
Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China
A double-pass grating imaging spectrometer is proposed and demonstrated. The traditional entrance slit is replaced by a middle reflective slit, which is used as a spectral filter rather than a spatial filter. The light from the scene passes through the same dispersive grating twice. The full image of the scene can be obtained with a snapshot. Therefore, the stripe noise and image distortion caused by image mosaicking can be eliminated. Besides, the target is easier to be captured and focused, just like using a camera. This method can be used to obtain clearer spectral images of the scene conveniently and quickly.
120.6200
Spectrometers and spectroscopic instrumentation
110.4234
Multispectral and hyperspectral imaging
300.6190
Spectrometers
PDF全文
Full Text
Chinese Optics Letters
2019, 17(1): 011202
Instrumentation, measurement, and metrology
Imaging method of single layer graphene on metal substrate based on imaging ellipsometer with large field of view
Download:680次
Guiyun Li
1,2
Liyuan Gu
1,2
Jingpei Hu
1
Linglin Zhu
1
[ ... ]
Huijie Huang
1,2
Author Affiliations
Abstract
1
Laboratory of Information Optics and Opto-Electronic Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
Single layer lattice graphene deposited on the metal substrate can hardly be imaged by the optical microscope. In this Letter, a large field-of-view imaging ellipsometer is introduced to image single layer graphene which is deposited on a metal substrate. By adjusting the polarizer and the analyzer of imaging ellipsometer, the light reflected from surfaces of either single layer graphene or a Au film substrate can be extinguished, respectively. Thus, single layer graphene can be imaged correspondingly under brightfield or darkfield imaging modes. The method can be applied to imaging large-area graphene on a metal substrate.
120.2130
Ellipsometry and polarimetry
160.4670
Optical materials
160.4760
Optical properties
PDF全文
Full Text
Chinese Optics Letters
2019, 17(1): 011201
Instrumentation, measurement, and metrology
Detection of water surface capillary wave by analysis of turning-point local signal data using a laser interferometer
Download:796次
Lieshan Zhang
Xiaolin Zhang
*
Wenyan Tang
Author Affiliations
Abstract
School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
A laser interferometry technique is developed to detect water surface capillary waves caused by an impinging acoustic pressure field. The frequency and amplitude of the water surface capillary waves can be estimated from the local signal data at some special points of the phase modulated interference signal, which is called the turning points. Demodulation principles are proposed to explain this method. Experiments are conducted under conditions of different intensity and different frequency driving acoustic signals. The results show the local signal data analysis can effectively estimate the amplitude and frequency of water surface capillary waves.
120.3180
Interferometry
120.7280
Vibration analysis
PDF全文
Full Text
Chinese Optics Letters
2017, 15(7): 071201
Instrumentation, measurement, and metrology
Entanglement-free determination of pretilt angles of twisted nematic liquid-crystal cells by phase measurement
Download:807次
Che-Wen Chiang
1,*
Ping-Chun Lin
2
Kei-Hsiung Yang
2
Author Affiliations
Abstract
1
Institute of Photonic System, National Chiao Tung University, Tainan City 71150, China
2
Institute of Imaging and Biomedical Photonics, National Chiao Tung University, Tainan City 71105, China
The pretilt angle of a twisted nematic (TN) liquid crystal display has a strong effect on viewing angles and response times of the display as well as shifting the light-leaking disclination lines into the black-matrix area within pixels of a thin-film-transistor driven TN panel for a high contrast ratio. In this Letter, we develop an optical method to determine the TN pretilt angle based on heterodyne measurements of the phase versus the incident angle of a thin TN cell subjected to out-of-plane rotations. We believe that our method of measuring phases has advantages of simpler setup and calculations, better stability, and less sensitive to ambient electromagnetic interference than the commonly used method of measuring intensities.
120.0120
Instrumentation, measurement, and metrology
PDF全文
Full Text
Chinese Optics Letters
2017, 15(8): 081203
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