Table of Content

25 October 2017, Volume 37 Issue 5

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Design and Realization of Large Polar-coordinate Scanner System on Compact Antenna Test Range Measurements

WU Xiang；HE Xin；KOU Peng；REN Tao

2017, 37(5):  1-9.  doi:10.12060/j.issn.1000-7202.2017.05.01

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The scanner system is the core equipment of compact range measurement. Among all the specifications of the scanner that evaluate are the range of scanning and the planeness of the scanning. A new kind of building-sized scanner which contains adjustment mechanism and can be multiple-installed based on modularity is designed in this paper in order to improve the adaptation of compact range measurement. In the max mode, this Polar-coordinate scanner, s turning radius is R3000mm, the height of rotate centre can reach to 12m, the planeness of scanning is 0.05mm（RMS）. In the compact mode, the rotation diameter is Φ3000mm， the height of rotate centre can drop to 4m. The technical index of the scanner is tested recently, and the scanner can be applied to the calibration of most compact antenna test ranges.

Performance Test and the Application on the Accelerator of the Radiochromic Film

CHEN Yi-zhen；LI Ming；CHEN Ke-sheng； ZHANG Wei-dong；YE Hong-sheng；LIN Min；XU Li-jun；XIA Wen；CUI Ying

2017, 37(5):  10-16.  doi:10.12060/j.issn.1000-7202.2017.05.02

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The purpose of this project is to establish the radiochromic film dosimeter for high dose level measurement during radiation processing. And batches of radiochromic film dosimeters were prepared using nylon as substrate and pararosaniline cyanide as dye. In order to verify the reliability of radiochromic film used for dose measurement, dose comparison in our laboratory carried out with FWT-60 made by Farwest and alanine film dosimeter. The comparison results are agreed within ±4%, and the value of En is less than 1.In addition, the film is suitable as dosimeters for the parameters measurement of the electron beam on the accelerator.

Study on Clock Crystal Oscillator Method based on Failure Analysis Theory

SUI Jian-ping；LUO Hong-tao；CUI Wei；ZHENG Wen-qiang

2017, 37(5):  17-21.  doi:10.12060/j.issn.1000-7202.2017.05.03

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Based on reliability analysis theory, and reference to the general electronic device failure analysis method, a systematic clock crystal oscillator failure analysis process is proposed. Based on the analysis, some typical cases are introduced which used this failure analysis method. The practice of this method can prove that the method give an effective project for clock crystal oscillator failure analysis.

Study of the BDS Module for Power Terminal

WEN Zhi-guo；CHEN Ying；PANG Zhen-jiang；DU Jun；JIA Qiang

2017, 37(5):  22-29.  doi:10.12060/j.issn.1000-7202.2017.05.04

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According to the requirement of safety satellite positioning services in power system, the BeiDou Satellite positioning techniques for power terminal is investigated. A BeiDou positioning module for power terminal is designed, which mainly includes the analog front-end, digital signal processing module. Low-power miniaturization and high sensitivity are discussed deeply. Finally, the BeiDou positioning prototype is tested in laboratory and outdoor environment.

Design of a Negative DC High Voltage Linear Power Supply

WANG Yi-zhou；WANG Bin；FENG Rong-wei

2017, 37(5):  30-34.  doi:10.12060/j.issn.1000-7202.2017.05.05

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In this paper, a negative polarity-based high-voltage linear power supply solution with optocoupler feedback is proposed, which can realize negative 1200V DC voltage output under the premise of using NPN type transistor as power regulating transistor. Furthermore, a small signal transfer function model is established for the proposed power scheme. Based on the transfer function model, it is proved that the proposed regulator has the advantages of high stability and low noise.

Design of Calibration-jig Using in CS115/CS116 Current Monitor Probe Time-domain Calibration

DONG Jia；YAO Li-jun；YU Can-yi

2017, 37(5):  35-39.  doi:10.12060/j.issn.1000-7202.2017.05.06

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The design method of calibration-jig using in CS115/CS116 Current monitor probe time-domain calibration is introduced. By analyzing the time and spectral domain property of CS115/CS116 signal， we know the bandwidth of the calibration-jig， and we simulate the calibration-jig in CST. The design method is verified by measurement， the VSWR of the jig is less than 2 within 500MHz.

Research on High Temperature Isolation Touch Control Module based on Capacitance Sensor

HUANG Jian

2017, 37(5):  40-43.  doi:10.12060/j.issn.1000-7202.2017.05.07

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Capacitive sensing is a kind of low power, low cost and high resolution non-contact sensing technology, which can be used in proximity detection, gesture recognition and remote sensing. The FDC2214 capacitive sensing technology is used to detect the touch button, which can effectively remove the interference. The detection value is transmitted to the MSP430 microcontroller through the IIC bus, using the adaptive algorithm to process the data to determine whether an object is in the target area, the most remote sensing distance can up to 30cm. In plant applications using thick glass window to isolate the harsh environment, so human-computer interaction without need to enter the high temperature, dust, grease and other harsh environment that can achieve operation, can ensure the safety and save the cost.

Design and Implementation of Test System for Magnetic Compass based on Labview

LV Shi-gui；SUN Hao-mou；LIU Xue-ye

2017, 37(5):  44-47.  doi:10.12060/j.issn.1000-7202.2017.05.08

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The magnetic compass is often as the key components for heading angle measurement on the unmanned aerial vehicle （UAV）. In order to test its performance, an intelligence measurement system for magnetic compass based on PXI bus computer and other hardware parts and Labview software is designed， which has realized various performance tests. At the same time, the system has a friendly interface and is able to save the test data. The practical application shows that the system is stable, easy operation, and can detect the magnetic compass fault before the installation of UAV parts for the flight, which improves the UAV flight safety.

Research on Present Situation of Measurements and Calibration of Aircraft Fluctuating Pressure

HU Xiang-ning；ZHANG Qi； YANG Shui-wang；GUO Hong-yan；JIANG Feng

2017, 37(5):  48-52.  doi:10.12060/j.issn.1000-7202.2017.05.09

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Fluctuating pressure is from airstream separating of aircraft surface, prominence, evidently occupies stochastic characteristics. The measurement and trace to the source directly determines the success or failure of aircraft,  development and test, is an important research content. This article briefly sketches the measurements of aircraft surface, the character of fluctuating pressure transducer, calibration and so on．

Digital Interferometer Angle Measurement Technology

DING Xiao-yong；TONG Qiong

2017, 37(5):  53-56.  doi:10.12060/j.issn.1000-7202.2017.05.10

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As compared with traditional analog phase discrimination technology， digital direction finding system of digital interferometer employs high precise digital phase discrimination technology and could thus raise greatly the precision of phase discrimination and satisfy the need of high precise direction finding of interferometer. Based on analysis of phase detection algorithm， this paper used two quadrature LO cross multiply two input signals， and used CIC filter to remove high frequency signal. Processing of atan function based on CORDIC algorithm. Experiment on interferometer angle measurement simulator shows that the error of phase detection is no more than 0.2° .

Design of Vaccum Sucker Angle Tester based on SSI Communication Technology

SHA Chun-zhe；WANG Kai-lei；WANG Chun-xi

2017, 37(5):  57-63.  doi:10.12060/j.issn.1000-7202.2017.05.11

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In order to meet the demand of precise measurement of the aircraft launch platform and communication to external industrial control system, a sucker angle measuring instrument based on SSI communication technology is designed. The basic principle, mechanical structure, hardware circuit and SSI communication interface of the angle tester is demonstrated in this paper. The experiment shows the tester has high precision and stability, and the angle measurement error of tester is less than 10″（3σ）, which can been widely used on datum plane, such as aircraft launch platform, three-axis turntable, marble flat-panel.

A Temperature Control System of Miniature Blackbody based on Thermoelectric Cooler

WU Hong-xia；ZHANG Bo；JIANG Feng；SUN Hong-sheng；SUI Zuo-ning；ZHANG Yu-guo；YANG Wang-lin；SONG Chun-hui

2017, 37(5):  64-67.  doi:10.12060/j.issn.1000-7202.2017.05.12

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The miniature extended-area blackbody is used as a radiation source when an infrared load is calibrated.Its temperature stability and uniformity directly affects the result of calibration.This paper is based on thermoelectric cooler and the control chip LTC1923 was used in the temperature control system of miniature blackbody. Under normal  temperature and pressure conditions, the temperature characteristics of miniature blackbody were tested. Experimental results show that the miniature blackbody works normally at 0℃~50℃, the time to increase or reduce 5℃ from the current temperature is less than 2 minutes, the temperature stability is better than 0.02℃/h, the temperature uniformity is better than 0.09℃, so the temperature control system meets the needs of the project.

Computer Control Technology based on SOPC

REN Lin；YIN Tong；LIU Qing-shan；WAN Na；WANG Gen

2017, 37(5):  68-72.  doi:10.12060/j.issn.1000-7202.2017.05.13

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This paper presents a computer control system based on SOPC. Through the SOPC as the control core，with the external circuit, we realized RS422, CAN, 1553B, FlexRay, Ethernet and other communication interface. The system has control signal、signal acquisition and data recording and other functions. The system has the advantages of high integration, strong expansibility and high reliability.

Uncertainty Evaluation of Verification Result of RAD-7 Radon Measuring Instrument

SUN Tao

2017, 37(5):  73-78.  doi:10.12060/j.issn.1000-7202.2017.05.14

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According to the transitive relation of quantity, it introduces the mathematical model of quantity transfer. According to the mathematical model, it introduces the uncertainty evaluation method of verification result. By Combining RAD-7 verification according to Verification Regulation of the Radon Measuring Instruments, it evaluates the related combined standard uncertainty of the volume activity response. It shows, the uncertainty of the verification result is mainly affected by the effect of radon transfer from the liquid radium source and verified instruments counting ability.