• Title/Summary/Keyword: PPS(Pulse Per Second)

Search Result 9, Processing Time 0.231 seconds

Development and Observation Result of High Speed Digital Conversion System of Astronomical Radio Siginal (우주 전파 신호의 고속 디지털 변환 장치 개발과 적용)

  • Kang, Yong-Woo;Song, Min-Gyu;Wi, Seog-Oh;Je, Do-Heung;Lee, Sung-Mo;Kim, Seung-Rae
    • The Journal of the Korea institute of electronic communication sciences
    • /
    • v.12 no.6
    • /
    • pp.1009-1018
    • /
    • 2017
  • We developed new Digital Sampler for KVN(: Korean VLBI Network). The sampler has 1024MHz sampling frequency with 2bits/sample. The sampler's input reference frequencies are 1pps(: pulse per second) and 10MHz, also UTC(: Universal Time Coordinated) time information out with 1PPS signal, synchronized. The output of sampling data is adapted VSI(: VLBI Standard Interface) specification including the time information. In order to confirm the performance of the sampler, we carried out the astronomical radio observation test in Ulsan Radio Observatory of KVN. It was confirmed the stable performance. In this paper, We introduce the new developed sampler and present the observational test result.

TDoA-Based Practical Localization Using Precision Time-Synchronization (정밀 시각동기를 이용한 TDoA 기반의 위치 탐지)

  • Kim, Jae-Wan;Eom, Doo-Seop
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.38C no.2
    • /
    • pp.141-154
    • /
    • 2013
  • The technology of precise time-synchronization between signal receive devices for separation distance operation can be a key point for the technology with TDoA-based system. We propose a new method for the higher accuracy of system's time-synchronization in this paper, which uses OCXO and DPLL with high accuracy to achieve phase synchronization at 1 pps (pulse per second) of signal. And the method receive time value from a GPS satellite. Essentially, the performance of GPS with high accuracy refers to long-term frequency stability for its reliability. As per the characteristic, as the GPS timing signals are synchronized continuously, the accuracy of time-synchronization gets improved proportionally. Therefore, if the time synchronization is accomplished, the accuracy of the synchronization can be up to 0.001 ppb (part per billion). Through the improved accuracy of the time-synchronization, the measurement error of TDOA-based location detection technology is evaluated. Consequently, we verify that TDoA-based location measurement error can be greatly improved via using the improved method for time-synchronization error.

The Repetition rate and Pulse-width control of Nd:YAG laser using One-Chip Microprocessor (One-Chip 마이크로프로세서를 이용한 Nd:YAG 레이저의 반복율 및 펄스폭제어)

  • Hong, J.H.;Chung, Y.H.;Yang, D.M.;Kim, W.Y.;Kim, H.J.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1696-1698
    • /
    • 1998
  • Pulsed Nd:YAG laser using Nd:YAG crystal operates stably in the thermal conductivity, mechanical, optical condition. That is used broadly in material processings because of easy reaction to the materials, and the maintenance is very easy because of lamp excitation. In these material processings, power dinsity control is very important to improve processing technology. Power density is controled by inductance and capacitance or repetition rate. Therefore we are going to control laser power density as One-Chip Microprocessor(PIC16C55) and 8051. We have been experimented at the pulse repetition rate range of 10pps to 60pps(pulse per second).

  • PDF

The Research via Linear of Tantalum Thin Film Thickness Depending on Revolution Velocity of Spin Coater (스핀코터 회전속도에 따른 탄탈륨 박막두께의 선형모델에 관한 연구)

  • Kim, Seung Wook
    • Journal of the Semiconductor & Display Technology
    • /
    • v.19 no.1
    • /
    • pp.17-22
    • /
    • 2020
  • Recently, the decrease in thin film thickness has been actively studied by changing several physical elements such as the increase in revolution velocity of lower substrate equipped with AC or DC motor. In this paper, we propose a novel spin coater control system that changes AC or DC motor and common use software with limitation of velocity and position control into step motor and LABVIEW software based on GUI to control revolution velocity and position more precisely. By determining six input values of rotation velocity 1, 5, 10, 25, 50, 100 PPS, we fabricated six samples using coating target, TA(tantalum) on silicon substrate and measured their thin film thickness by SEM. Hence, this research can be applied to inferring thin film thickness of tantalum regarding any value of revolution velocity without additional experiments and for linear reference model via property analysis of thin film thickness using other thin-film materials.

Development of high repetition rate and high power pulsed Nd:YAG laser power supply using ZCS resonant converter (ZCS공진형 컨버터를 적용한 고반복 대출력 펄스형 Nd:YAG 레이저 전원장치 개발)

  • Joe, K.Y.;Kim, E.S.;Byun, Y.B.;Kim, H.J.;Park, J.M.;Lee, H.W.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.514-517
    • /
    • 1996
  • Zero current switching(ZCS) series resonant converter is used to control laser power density in a pulsed Nd:YAG laser power supply. The high power and high repetition rate paused Nd:YAG laser is designed and fabricated to control current pulse width and pulse repetition rate in the double elliptical laser oscillator. In order to find out operational characteristics of pulsed Nd:YAG laser, the electrical properties of driving power supply and laser output power are investigated and experimented by changing of the current pulse width from 200uS to 350uS(step 50uS) and pulse repetition rate range of 500pps(pulse per second) to 1150pps. From that result, we obtaind maximum efficiency of 1.83% and maximum laser output or 220W at the condition of 350 uS and 1150pps with one Nd:YAG rod), and obtained that of more than 400W with two laser head connecting series.

  • PDF

A Study on the Weldability of Magnesium Alloy by Laser Heat Source (III) - Butt Weldability of Sand Casting Magnesium Alloy using Pulsed Nd:YAG Laser - (레이저 열원을 이용한 마그네슘 합금의 용접성에 관한 연구 (III) - Pulsed Nd:YAG 레이저를 이용한 사형주조 마그네슘 합금의 맞대기 용접성 -)

  • Kim, Jong-Do;Lee, Jung-Han;Lee, Mun-Yong
    • Journal of Welding and Joining
    • /
    • v.31 no.2
    • /
    • pp.57-62
    • /
    • 2013
  • Magnesium has good castability and limited workability, so its products have been manufactured by almost casting processes. In this study, a pulsed Nd:YAG laser was used to butt-weld the sand casting magnesium alloys. And the effect of welding conditions such as peak power, pulse width, welding speed was evaluated in detail. As a result of this study, large underfill and plenty of spatter taken place under the conditions with high peak power. Thus, it is recommended to use low peak power and long pulse width to obtain good welds with deep penetration. It is also confirmed that the welding speed and pps(pulse per second) are directly connected at weld defects such as underfill, porosity.

Laser Welding Parameter Variations and its Application for Plastic Adhesion

  • Park, Sung-Jin;Park, Sung-Joon;Park, Hae-Young;Park, Jae-Wook;Sim, Ji-Young;Choi, Jin-Young;Kim, Hee-Je
    • Journal of Electrical Engineering and Technology
    • /
    • v.2 no.1
    • /
    • pp.112-117
    • /
    • 2007
  • a parametric investigation was conducted to evaluate the effect of the laser beam for plastic adhesion. To determine the best condition for plastic adhesion, the $CO_2$(wavelength $10.6{\mu}m$) and nd:yag(wavelength $10.6{\mu}m$) laser were experimented with. From the experiment results obtained, the nd:yag laser was revealed to be the most suitable for plastic adhesion. In this study, three adhesion parameters such as input power level, working time of laser beam and pps(pulse per second) were systematically adjusted for suitable adhesion. From these experiments, it was observed that the target plastic melted and was evaporated by the nd:yag laser. Furthermore, the relationships between adhesive surface by laser beam and above three parameters were discovered.

A Study on the Scribing of FTO using Pulsed Nd:YAG Laser (펄스형 Nd:YAG 레이저를 이용한 FTO 식각에 대한 연구)

  • Kim, Hee-Je;Park, Sung-Joon;Son, Min-Kyu;Lee, Dong-Kil;Lee, Kyoung-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.57 no.8
    • /
    • pp.1407-1411
    • /
    • 2008
  • In material processing, a laser system with optimal laser parameters has been considered to be significant. Especially, the laser scribing technology is thought to be very important for fabricating DSSC(Dye sensitized solar eel!) modules with good quality. Moreover, the $TEM_{00}$ mode laser beam is the most dominant factor to decide the IPCE(Incident photon to current conversion efficiency) characteristics. In order to get the $TEM_{00}$ mode, a pin-hole is inserted within a simple pulsed Nd:YAG laser resonator. And the spatial field distribution is measured by using three size pin-hole diameters of 2.0, 6.0mm respectively. At that moment, each case has the same laser beam energy by adjusting the discharge voltage and pps(pulse per second). From those results, it is known that the pin-hole size of 2.0mm has the perfect $TEM_{00}$ mode. In addition, at the charging voltage of 1000V, 10pps and the feeding speed of 1.11mm/sec, the SEM photo of FTO(Fluorine-doped tin oxide) thin film layers shows the best scribing trace.

A Study on Development and Analysis of Control Operation Software of High-Speed Recorder (고속기록기의 제어운용 소프트웨어 분석 및 개발에 관한 연구)

  • Hwang, Chul-Jun;Oh, Se-Jin
    • Journal of the Institute of Convergence Signal Processing
    • /
    • v.10 no.4
    • /
    • pp.280-288
    • /
    • 2009
  • In this paper, we developed new time information recording module of VSI (VLBI Standard Interface) format by analyzing the Mark5B recorder control and operation software with 1Gbps speed, which is able to record the weak signal of space radio source, through the Korean VLBI Network (KVN). The control and operation software of high-speed recorder consists of 2 kinds of software, which is that it can operate RAID control board by controlling large capacity HDD drive and the network control and operation. Especially, core software in high-speed recorder is able to output the results after performing and analyzing the input command. Through the analysis of control and operation software, new time information recording module, which is needed to process the observed data for correlation, is developed. New developed time information recording module can record the time information together after checking the interrupt of 1PPS(Pulse Per Second) input signal when the observed data will be recorded. To verify the normal operation of the developed time information recording module, we performed the real observation test and confirmed the effectiveness of developed software through analyzing the recorded observation data.

  • PDF