Table of Content

25 August 2022, Volume 42 Issue 4

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Review on Application of Femtosecond Optical Frequency Comb in Metrology

ZHANG Zhi-tao, LIANG Ya-jun, ZHANG Tie-li, GAO Xiao-qiang

2022, 42(4):  1-8.  doi:10.12060/j.issn.1000-7202.2022.04.01

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Femtosecond optical frequency comb is an important research direction in the field of ultrafast laser optics，by locking the repetition rate(f_r)and carrier envelope phase shift rate(f_o)of mode-locked laser to the microwave frequency reference，in the time domain，it presents a series of femtosecond periodic ultra-short sequence pulses，and in the frequency domain，it presents a series of discrete and equally spaced longitudinal mode components，which are widely used in time and frequency transfer，spatial scale measurement，precision spectral measurement and many other metrological scientific research fields.On the basis of introducing the basic principle of femtosecond optical frequency comb，the application research of femtosecond optical frequency comb in metrology field is introduced emphatically，and its important role and significance in metrology field are analyzed.

Research on Coaxiality Calibration Technology of Tensile Testing Machine

YU Ze-li, FANG Yong-qiang, YANG Jun-hong, ZHANG Bing, ZHANG Yi-xin

2022, 42(4):  9-14.  doi:10.12060/j.issn.1000-7202.2022.04.02

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The affecting factors on the coaxiality measurement results were analyzed，including coaxiality bar material，test load，calibration method，assembly mode，loading rate，mechanical eccentricity，etc.The results indicated that among three measurement methods of coaxiality，the strain gage method was best，followed by extensometer method and geometric method.The influence sequence of each factor ranked as:mechanical eccentricity，assembly mode，coaxiality bar material，calibration method，loading rate.The coaxiality was increased with an increase in mechanical eccentricity，elastic modulus of coaxiality bar material and loading rate，while decreased with the rise of test load.The influencing order of assembly mode on coaxiality was the thread fixture，round bar fixture and the fixture with universal structure.

Design of High and Low Temperature Test Chamber for Pressure Sensor Calibration

HUANG Qi-gang, LI Jing, BAI Tian, GAO Bing-tao, MEI Hong-wei

2022, 42(4):  15-18.  doi:10.12060/j.issn.1000-7202.2022.04.03

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Based on the calibration requirements of pressure sensors in high and low temperature environments, a special high and low temperature test chamber is designed. Its temperature range can reach -120℃~500℃. The overall scheme of the high and low temperature test chamber is proposed, the method for realizing the temperature in a wide temperature area is introduced, and the solution and control process for the incompatibility of high temperature and low temperature systems are proposed. The test verification results show that the high and low temperature test chamber achieves the purpose of realizing the temperature in a wide temperature range and meets the design index requirements.

Research on Simulation Device of Calibration Environment for Site Measuring of Ship

LUAN Jing, CHEN Le, ZHAO Jun

2022, 42(4):  19-23.  doi:10.12060/j.issn.1000-7202.2022.04.04

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Due to the pressure and electrical instruments in the technical state of the original ship equipment，in a harsh environment，the temperature，humidity，electromagnetic environment，vibration and other parameters cannot meet the requirements and cannot carry out measure calibration.Therefore，a simulation device based on the on-site measurement and calibration environment of ship is designed.The device consists of two parts:environmental control and verification operation.It is focued on constant temperature and humidity technology in high temperature environment，and the structure design of the split verification cabin.The automatic adjustment and controlling of microenvironment is realized.Through the performance test，it is proved that the temperature fluctuation and evenness indexes of the verification cabin meet the design standards，and the environmental condition guarantee problem of site measureing calibration is solved.

Research on Automatic Measurement Method of Wall Thickness of Large Shells Based on Coordinate Fusion

WU Tong, GAO Yue, LIU Ke, GUO Li-zhen, BAO Chen-xing, SUN Zeng-yu

2022, 42(4):  24-30.  doi:10.12060/j.issn.1000-7202.2022.04.05

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An automatic measurement of wall thickness of large shell based on the principle of grating projection and its application in the automatic measurement of conical shell products are introduced.A method of data merging based on coordinate transformation and  unification is used.Through the comprehensive calibration of multiple coordinate systems of the measurement system，the multiple station scanning data is merged precisely.The product comparison analysis and wall thickness detection are completed by the Polyworks Software，and the measurement uncertainty of wall thickness is analyzed and evaluated.It is showed that the automatic measurement method of wall thickness of large shell based on coordinate fusion can effectively improve the detection quality and efficiency of products.

Air Data Estimation of FADS/INS Fusion Based on UKF

JIANG Bao-rui, LIU Peng, XIAO Di-bo

2022, 42(4):  31-36.  doi:10.12060/j.issn.1000-7202.2022.04.06

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To solve the problems of airflow interference and inertial measurement data dispersion when the aircraft is flying at high speed，an algorithm with sensors data fusion is proposed，which estimate the real-time air data of the aircraft by Flush Air Data Sensor System(FADS）and Inertial Navigation System(INS）based on Unscented Kalman Filtering(UKF).The algorithm uses high-dimensional nonlinear system to model the relationship between inertial system and air system.Combined with the data of FADS and INS，the air speed is calculated，and then air data such as angle of attack and angle of sideslip are estimated.In the experimental results，compared with the original estimation methods such as INS direct solution and extended Kalman filter(EKF）fusion，the accuracy and system stability of estimation in this paper are improved.

Study on Vision Measuring Technology of Axis Direction of Film Cooling Holes

BI Chao, ZHANG Chao, FAN Chu-yi, FANG Jian-guo

2022, 42(4):  37-42.  doi:10.12060/j.issn.1000-7202.2022.04.07

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With regard to the measuring difficulty of the axis direction of those film cooling holes on the high-pressure turbine blades,a 5-axis vision coordinate measuring system was established to explore and study the inspecting method and equipment for film cooling holes,which combined non-contact vision measurement with traditional multi-axis coordinate measurement together.In order to derive the axis vector parameter of the measured hole,the measuring method to realize the 3D morphology reconstruction of film cooling hole by depth from focus technology and transform the image sequence captured by the industrial camera to the 3D physical data was proposed.And then,the axis vector of the target hole could be derived by spatial line fitting.Finally,to verify the effectiveness and feasibility of the vision measuring method proposed in the paper,a high-pressure turbine blade was selected and the axis vector of the target hole on its leading edge was inspected by the system ten times,in which the repeatability accuracy of the axis angles was smaller than 0.30°.Therefore,a measurement technology solution of the axis direction of film cooling holes was provided.

Analysis of Causes of Zero Drift of Piezoelectric Shock Sensor and Zero Drift Suppression

FANG Yuan-yong, WU Jian, YANG Ke-xin, DAI Yi-lin

2022, 42(4):  43-48.  doi:10.12060/j.issn.1000-7202.2022.04.08

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The output zero drift of shock sensor is an important characteristic affecting.The problem of zero drift has been explored for a long time.Starting from the characteristics of the output signal of the shock sensor，the sensor model and the transformation circuit is analyzed.Combined with the relationship between the frequency response of the sensor installation and shock signal，it is concluded that the high-frequency shock signal is amplified at the resonant frequency of the sensor installation and the amplification leads to zero drift.The correctness of the theoretical derivation is verified by comparing the theoretical derivation with the actual sensor output results.Finally，the zero drift suppression measures and practical results are described.

Design and Realization of Portable Micro-vibration Visual Measuring Instrument

ZHAO Hai-jiao, SHAN Ming-guang, XIONG Xue-fen, ZHU Hao-dong, DENG Yi-jie

2022, 42(4):  49-55.  doi:10.12060/j.issn.1000-7202.2022.04.09

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Aiming at the undetectable micro-vibration，the large amount sensors and difficult arrangement in the contact vibration measurement，and inefficiency and costliness of optical vibration measurement，a vision-based portable micro-vibration visualization measuring instrument is designed.A gray-scale average measurement algorithm based on blind source separation is proposed to extract vibration signals，and the video amplification algorithm is used to make the micro-vibration visualization.Furthermore，the measurement system is integrated into a portable instrument based on an embedded development platform.The testing results，which provides positive visualization and accurate measurement，are presented to validate the effectiveness of this proposed method，which can be provided to solve the problems existing in the vibration measurement.

Discussion on Processing Method of Measurement Colored Noise Data

FU Li, GAO Bing, LIU Ming-bo

2022, 42(4):  56-59.  doi:10.12060/j.issn.1000-7202.2022.04.10

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The colored noise processing of theodolite for high speed moving target measurement data is analyzed and discussed.The random errors of the theodolite measuring data processing of the classical methods is introduced.The problems existing in the method of the colored noise processing are pointed out.Based on the analysis for the measurement of serial correlation in the finite difference method，two processing strategies for the colored noise data are proposed.They are non-correlation transformation method and correlation processing method.The calculation process and method of the two processing strategies are introduced in detail.The effectiveness and rationality of the proposed processing strategy are verified by the actual data processing example.Finally，the characteristics of the methods are compared and analyzed.

Design of Micro Signal Detection Circuit for Piezoelectric Level Gauge

LIU Yi, ZHANG Xiao-fei, SUN Fu-tao, LU Chao

2022, 42(4):  60-64.  doi:10.12060/j.issn.1000-7202.2022.04.11

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A micro signal detection circuit for piezoelectric level gauge is designed.Its engineering implementation is introduced from five aspects:anti-saturation charge amplification，band-pass filtering，precision detection，two-stage comparison and logic control.It can process AC signal with unipolar power，monitor the output charge of material level gauge in real time，and convert it into switch signal output.With the function of sensitivity adjustment，the action threshold can be set according to the damping characteristics of different materials.And the polarity of the output level can be set according to the user’s needs，by which the flexibility and adaptability of the level gauge is improved.Combined with theoretical calculation，simulation analysis and experimental test，the rationality and correctness of the design are verified.

Research on a Miniaturized High Synchronicity Servo Actuator System

LI Pei-jian, LI Huai-bing, FENG Li-mo, YANG Bo, LIU Kai, YANG Na

2022, 42(4):  65-70.  doi:10.12060/j.issn.1000-7202.2022.04.12

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A miniaturized high synchronicity servo actuator system was introduced.In view of the strict requirements of the narrow space and special high temperature environment of the engine power regulator,the hydraulic actuator was designed for high temperature resistance and miniaturization.The split structure of hydraulic actuator and control valve and the structure design of asymmetric piston rod were adopted,which realized the large motion stroke and reduced the section size and axial length.To realize the smooth motion control and high position synchronicity in the whole stroke range of the three-way actuators,the control strategy of dynamic adjustment of global control parameters of initial position synchronization,position synchronization control and asymmetric position control was adopted.Through theoretical calculation and load test verification,the servo actuator system meets the requirements of environment and space,and has good position synchronicity control performance.

Design and Realization of Optical Strapdown Standard Navigation Computer

HUO Geng, HUANG Ping-hua, ZHANG Xing-fan

2022, 42(4):  71-76.  doi:10.12060/j.issn.1000-7202.2022.04.13

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In order to meet the the requirements of high precision，low power and miniaturization of current optical notes and even benchmarks，an embedded navigation computer based on FPGA and DSP processor is designed.Navigation computer hardware design is described and focused on the cooperative use of MPM and DCM，which fully embodies the adbantages of joint use of DSP and FPGA.Moreover，for eliminating the influence of long time working on system accuracy，the design of Kalman filter based on the combination of main inertial navigation direction and log speed has been studied.Finally，the navigation computer has been applied to the strapdown reference，and the feasibility of the hardware scheme of the navigation computer and the rationality of Kalman filter design has been verified.It is showed that the ENC based on FPGA and DSP was more stable，reasonable and feasible.The results show that the performance of the embedded navigation computer based on FPGA and DSP dual core is stable，the design is reasonable,and meets the requirements of optical section，continuous reference，high precision and low power consumption.

Research on Improvement of Bus Data Simulation System for an Aerial Camera

ZHAO Yu-liang, WANG Shu-juan, WANG Ying-ying

2022, 42(4):  77-82.  doi:10.12060/j.issn.1000-7202.2022.04.14

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Aiming at the problems existing in the bus data simulation system of airborne equipment based on 51single chip microcomputer，a bus data simulation system based on PC104 embedded system is proposed and designed.The system uses ZHHK429-PC104-Plus board and self-developed ARINC407 interface card，combined with 10-inch industrial touch color display screen，to improve the design of the original system，the development of graphical software is finished based on the Windows Embedded XP operating system combined with LabVIEW，inertial navigation and atmospheric machine data simulation output is achieved，the full state power detection of camera system can be finished in the workshop.Tests show that the system all performance indexes have been obviously improved on the basis of the original system.

Research on Instantaneous Dose Rate Effect Based on TCAD Simulation

CHU Fei, CHEN Hong-zhuan, YU Chun-qing, ZHENG Hong-chao, WANG Liang, YANG Cheng-yuan

2022, 42(4):  83-87.  doi:10.12060/j.issn.1000-7202.2022.04.15

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A TCAD simulation method is proposed to simulate the instantaneous dose rate effect of a radiation-hardened SRAM with a million gate level of 0.18μm CMOS technology.Simulation results show that the protection ring layout design can effectively improve the instantaneous dose rate effect performance of the circuit.Using the dose rate radiation source,the experiment verification of simulation effectiveness is carried out.Simulation and experiment results show that the error between the photocurrent peak obtained by TCAD simulation and the photocurrent peak obtained by experiment is less than 5%，which confirms the effectiveness of the simulation method for studying the instantaneous dose rate effect.

Design of Automatic Test System on TestCenter Software Platform

WEI Zhi-qiang, WANG Bing, MA Min, NIE JI-xin, YAN Jia-hui

2022, 42(4):  88-92.  doi:10.12060/j.issn.1000-7202.2022.04.16

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With the rapid development of communication technology，the number of radio test instruments is expanding rapidly in the market，and the test tasks are increasing year by year.Facing the rapid growth of business，the traditional manual test method cannot meet the market demand.In view of this problem，the automatic test system is designed，using TestCenter software platform，combined with the existing measurement standard equipment，and adding interface and intelligent switching equipment.The automatic test system has been verified，which is simple to operate，reliable to run，and fast to test.