Beijing Orient Institute for Measurement and Test

Beijing, China

Beijing Orient Institute for Measurement and Test

Beijing, China
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Wang H.,China Institute of Metrology | Lei M.,China Electric Power Research Institute | Zhang J.,China Electric Power Research Institute | Sun Y.,Beijing Orient Institute for Measurement and Test | And 5 more authors.
Gaoya Dianqi/High Voltage Apparatus | Year: 2012

In this paper, a measuring standard equipment of high voltage switch mechanical characteristic testing instrument is developed, which can use for calibration of high voltage switch mechanical characteristic testing instrument efficiently. The standard equipment based on ARM and FPGA technique, use COPLEY linear motor TBX-2504 as speed module, use high speed MOSFET as speed signal and time signal. According to the test data provided by National Legal Metrology Institutions, the device performance parameters meet the design requirements.


Jia J.,Beijing Orient Institute for Measurement and Test | Zhang S.,Beijing Orient Institute for Measurement and Test | Peng Z.,Tsinghua University | Chai H.,Beijing Orient Institute for Measurement and Test | And 3 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2014

A novel technique was developed to measure and calibrate gas temperature in vacuum by tunable diode laser absorption spectroscopy (TDLAS) in wavelength modulation spectroscopy (WMS) mode. The traceability and mea-surement error were experimentally investigated and error-analysis was performed. The rotation-vibration temperature of C2H2 molecules was measured and calibrated in vacuum by evaluating a well-chosen pair of spectral lines around 6558 cm" and with a lab-built calibrator, Grade-1 Pt-resistance thermometer as the standard, and a high precision thermostat as the heat source. The results show tht the newly-developed TDLAS technique is capable of measuring the rotation-vibration temperature of C2H2 molecules in vacuum with high sensitivity and good stability in low to medium temperature range. For example, the experimental uncertainty was U=0.24℃, k=2, and the discrepancy between the results measured by TDLAS and the Pt-resistance thermometer was within ±0.2℃.


Zhimin P.,Tsinghua University | Yanjun D.,Tsinghua University | Junwei J.,Beijing Orient Institute for Measurement and Test | Lijuan L.,Tsinghua University | Zheng L.,Tsinghua University
Optics Express | Year: 2013

Integrated absorbance (IA) can be used to infer gas temperature and concentration directly, in this paper, we proposed a new method that uses the 1st harmonic to measure the IA under low absorption conditions (<10%). Subsequently, a large number of numerical simulations are used to validate the reliability and accuracy of this method, and several absorption lines of CO2 and H2O molecules near 6981 cm-1 are selected to determine the IA and species concentration in experiments. Calculation and experiment results show that the proposed method can accurately measure IA in actual measurements. © 2013 Optical Society of America.


Lan L.-J.,Tsinghua University | Ding Y.-J.,Tsinghua University | Jia J.-W.,Beijing Orient Institute for Measurement and Test | Du Y.-J.,Tsinghua University | Peng Z.-M.,Tsinghua University
Wuli Xuebao/Acta Physica Sinica | Year: 2014

Measuring the temperature in vacuum environment is more complex than in atmospheric environment. For example, high vacuum will cause the thermocouple sensor surface desorption, and the mechanism of heat transfer is also different. Therefore, there are some uncertainties if the thermocouple is used to measure the gas temperature in vacuum condition. In the present paper, tunable diode laser absorption spectroscopy (TDLAS) is employed to measure the gas temperature and also explore the application prospect of TDLAS temperature measurement technology in vacuum environment. During the thermal vacuum experiments, the vacuum gas cell is immersed in the thermostatic bath, and the gas temperature is determined by TDLAS. Meanwhile, a standard Pt-resistance is used to measure the thermostatic bath temperature. The results show that the temperatures of the gas and thermostatic bath are highly consistent with each other, and the difference between the two temperatures is less than ±0.2°C when the thermostatic bath is stable. © 2014 Chinese Physical Society.


Huang X.,Beijing Orient Institute for Measurement and Test | Cai J.,Beijing Orient Institute for Measurement and Test | Pan P.,Beijing Orient Institute for Measurement and Test | Tong Y.,Beijing Orient Institute for Measurement and Test | Song J.,Beijing Orient Institute for Measurement and Test
2015 IEEE 12th International Conference on Electronic Measurement and Instruments, ICEMI 2015 | Year: 2016

The calculable resistors can be used to calculate AC-DC difference dependence of frequency. Usually the resistance wires are chosen high resistivity material and as thin as possible to avoid skin effect and so on. However, this kind of wires often induce much temperature drift from DC base value, when current flows through the wires. The performance of the calculable resistors is limited by the loading capability. The loading capability limited the using of calculable resistors in some area, leading to low stability of the AC-DC calculable difference. To solve this problem, a kind of coaxial calculable resistors design was proposed here to improving the calculable resistors and acquires good results in experiments. © 2015 IEEE.


Tong Y.,Beijing Orient Institute for Measurement and Test | Huang X.,Beijing Orient Institute for Measurement and Test
2015 IEEE 12th International Conference on Electronic Measurement and Instruments, ICEMI 2015 | Year: 2016

Since the AC resistance measuring meter and the bridge adopt measurement principle of the four-terminal-pair, but the resistor with calculable frequency dependence is usually the four-terminal structure. So it is necessary to design a four-terminal-pair resistor with calculable frequency dependence. This paper introduces the 100Ω coaxial resistor with calculable frequency dependence based on four-terminal-pair. It introduces the structure and parameters of the resistance sample, builds the coaxial resistance's mathematical model and calculates the related parameters. Calculated AC-DC difference is only a few parts in 10-11 at a frequency of 1kHz, the time constant of the resistance is 3.6×10-9s. By comparing with the measuring result, both have a good consistency. © 2015 IEEE.


Jia J.,Beijing Orient Institute for Measurement and Test | Zhang S.,Beijing Orient Institute for Measurement and Test | Jin G.,Beijing Orient Institute for Measurement and Test | Yang L.,China Academy of Space Technology | And 2 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2013

A novel technique was developed to simulate on earth the temperature measurement of the gases in space, based on tunable diode laser absorption spectroscopy (TDLAS) technology. The feasibility, precision, and uncertainty in measurement of the vibration-rotation temperatures of the trace gas molecules in space environment with TDLAS were addressed, and exemplified with the 1535.39 nm and 1535.432 nm absorption spectra of C2H2. The calculated and experimentally simulated results show that the TDLAS technology is feasible to measure the gas temperature in space vacuum, and that even at a pressure lower than 10-3 Pa, the gas temperature can be measured in fairly high precision when the absorption intensity of the spectrum-pair is strong enough and its effective absorption path is long enough.


Fangliang J.,Beijing Orient Institute for Measurement and Test | Qizheng J.,Beijing Orient Institute for Measurement and Test | Dongwei Z.,Beijing Orient Institute for Measurement and Test | Yibo D.,Beijing Orient Institute for Measurement and Test | Chun D.,Beijing Orient Institute for Measurement and Test
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

The flow rate is calculated via ultrasonic flow meter (UFM), which is through measuring the difference of time transmitting flow between flow direction and reverse direction. This paper describes the uncertainty analysis for the method of time difference which is commonly used in ultrasonic flow measurement, and the analysis of error source of uncertainty components as well as the general method of elimination. Based on the technique of pseudo random sequence, this paper presents a precise time difference method based on digital correlation technology, and its principle, realization way and uncertainty evaluation are introduced. On the DSP and FPGA system platform, an ultrasonic flow meter scheme based on the digital correlation technology is suggested. © 2015 SPIE.


Jia Q.,Beijing Orient Institute for Measurement and Test | Gao Z.,Beijing Orient Institute for Measurement and Test | Zhangb X.,Shanghai Indoor Contamination Control Industry Association | Chen J.,Suzhou Sujing Automation Equipment Corporation
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

The traceability of light-scattering airborne particle counter's counting performance has received more attention, but has failed to settle internationally. This paper puts forward a traceability method of light-scattering airborne particle counter's counting performance on single particle size, based on Anodic Aluminum Oxide (AAO) template and (SEM), by reforming the traditional standard airborne particle counter, building a measurement system including AAO and SEM, and utilizing the method of statistical physics in data processing to obtain more accurate measurement results. According to the actual test results and its uncertain ty analysis, the traceability method of light-scattering airborne particle counter's counting performance based on AAO and SEM makes sense in theory, and has certain research value on a solution to the traceability problem of light-scattering airborne particle counter internationally. © 2015 SPIE.

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